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Caterpillar UPS 120
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar UPS 120 is the smallest single-module unit in Cat's flywheel-based Uninterruptible Power Supply line, rated 120 kVA. It is not an engine-driven generator set - it carries no internal combustion engine, fuel system, crankcase, or cooling circuit of its own. Instead, a spinning flywheel stores kinetic energy and an IGBT-based bi-directional converter releases that energy instantly during a utility outage, bridging the gap until a separately supplied standby generator set reaches rated speed. The platform traces to Caterpillar's distribution agreement for Active Power's CleanSource flywheel UPS technology, entered around 1999 to 2000 and marketed since under the Cat UPS name. The single-module family spans roughly 120 through 900 kVA (120, 150, 250, 300, 301, 500, 600, 750, 900), with larger installations served by the parallel-capable 300Z through 1200Z multi-module systems.
Across the line the core flywheel-converter architecture stayed consistent, but Caterpillar added features over time: remote SNMP and Modbus monitoring, external maintenance bypass, redundant flywheel-and-UPS configurations, and color touch-screen operator interfaces became standard or optional as the platform matured into the Z-series. That modular Z-series now dominates current Cat literature, pushing the fixed-rating single-module cabinets, including the 120 kVA size, into legacy status. In the used and parts market this matters because these cabinets turn up decommissioned from data centers, hospitals, and industrial sites while still structurally sound - the real question for a buyer is calendar-based wear items like the bearing set and vacuum pump, since a flywheel UPS ages on time in service rather than on the running-hours logic used for diesel engines.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Caterpillar UPS 120 specifications
Engine
| Machine type | Battery-free, flywheel-based static Uninterruptible Power Supply (UPS) module, line-interactive design. No internal combustion engine is fitted — despite the shared Cat parts-book classification, this unit has no diesel engine, fuel system, or alternator prime mover of its own. |
| Rated capacity | 120 kVA, single-module configuration. This is the smallest rating in the Cat flywheel UPS product line, which spans 120 kVA per module up to multi-MVA parallel systems. |
| Output power (kW) | Not published for this rating and not safe to infer from other family sizes (power factor varies 0.8-0.9 across the line, e.g. 750 kVA/675 kW, 300 kVA/240 kW). Verify with your dealer. |
| Power conversion architecture | IGBT-based bi-directional converter with static bypass switch, harmonic cancellation, and power-factor correction. This is the standard architecture across the whole flywheel UPS family; not confirmed as an identical published spec for the 120 kVA unit specifically. |
Weights
| Operating weight | Not published for the 120 kVA single-module cabinet. Weight varies heavily by kVA rating and cabinet count across the family (roughly 4,242 kg / 9,350 lb for the 750 kVA single module up to 9,185 kg / 20,250 lb for a 4-cabinet 1200 kVA system), so it cannot be reliably extrapolated down to 120 kVA. Verify with your dealer. |
| Shipping weight | Not documented for this rating. |
| Ground pressure | Not applicable — stationary electrical equipment, not a mobile machine. |
Dimensions
| Cabinet dimensions | Not published for the 120 kVA cabinet. Other single-module family sizes run roughly 865 to 998 mm (34.0 to 39.3 in) depth and 2032 to 2438 mm (80 to 96 in) height, with width scaling by kVA rating (the 750 kVA unit is 3353 mm / 132 in wide). These are not safe to extrapolate to the 120 kVA size. Verify with your dealer. |
| Transport configuration | Not documented for this rating. |
Performance
| Flywheel start-up | Family-wide design: the flywheel accelerates to about 4,000 rpm before the UPS is load-ready, continuing to a full-charge speed near 7,700 rpm; the complete start-up sequence takes under 5 minutes. Documented at the flywheel-UPS platform level, not confirmed as unique to the 120 kVA rating. |
| Discharge/transfer response | Output voltage transient stays under about 3% at full load during loss and return of input power, with transfer to bypass essentially instantaneous (disconnect completed in under one half-cycle). Platform-level spec, not confirmed specific to the 120 kVA rating. |
| Overload capability | Not confirmed for the 120 kVA rating specifically. Other family units publish roughly up to 105% continuous, 125-150% for several minutes, and 150-200%+ for very short surges — treat these as indicative of the platform, not a guaranteed 120 kVA figure. |
| System efficiency | Not published specifically for the 120 kVA unit; family units in general run about 97-98% total system efficiency. |
| Travel speed / gradeability | Not applicable — stationary electrical equipment with no traction or travel function. |
Service capacities (summary)
| Fuel tank | Not applicable — no internal combustion engine. |
| Engine oil | Not applicable — no internal combustion engine. |
| Cooling system | Not applicable in the traditional liquid-coolant sense; the family design uses redundant cooling fans for forced-air cooling. No coolant capacity is documented. |
| Hydraulic system | Not applicable — no hydraulic system fitted. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
UPS 120 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not applicable | The Cat UPS 120 belongs to the Cat UPS-Flywheel family (UPS120/150/250/300/301/500/600/750/900), a flywheel-based uninterruptible power supply module. It is an electromechanical energy-storage and power-bridging unit, not a diesel engine driving its own generator end. It carries no engine crankcase of its own; it bridges load electrically for a short ride-through window until a separately supplied Cat diesel generator set walks in and assumes the load. No engine oil refill capacity applies to this unit. |
| Cooling system | Not applicable | No liquid-cooled engine block exists on the UPS 120 module. Cabinet/electronics cooling on flywheel UPS units of this class is typically forced-air, with intake air filters as the only cooling-related service item. No coolant/antifreeze refill capacity or mix ratio is documented for this unit. |
| Fuel tank | Not applicable | The UPS 120 has no onboard fuel tank or fuel system. Fuel storage and fuel specification belong to the separate diesel generator set the UPS unit is paired with, not to the UPS module itself. |
| Flywheel bearing / rotor lubrication | Not documented for this model in publicly available literature | Flywheel UPS modules in this class generally use sealed, low-friction bearing designs (mechanical anti-friction bearings or magnetically supported rotors, sometimes housed under partial vacuum to cut windage loss) that need little to no routine lubrication compared with a conventional engine. Where a vacuum-housed design is used, service is normally limited to periodic vacuum-level and sight-gauge oil checks rather than a scheduled oil-and-filter change. Caterpillar has not published a specific bearing oil or grease brand/viscosity spec for the UPS 120 in generally available documentation — confirm the exact lubrication requirement and interval against the unit's own Operation and Maintenance Manual or with a Cat dealer. |
| Hydraulic system and tank | Not applicable | No hydraulic circuit is part of the UPS 120 module; it has no hydraulic tank, pump, or cylinder functions to service. |
| Transmission / powertrain compartments | Not applicable | The UPS 120 has no transmission, torque converter, or drivetrain compartment; it is a stationary electromechanical energy-storage unit, not a driven machine. |
| Final drives / axles | Not applicable | Not applicable — the UPS 120 is a stationary panel/flywheel assembly with no final drives or axles. |
| Grease (general chassis/service points) | Spec only — quantity not documented | General Cat multipurpose grease practice applies to any exposed mechanical service points (access doors, latches, hinges) on the enclosure, but no model-specific grease chart for the UPS 120 internals was located. Verify any internal lubrication points and grease spec with the unit's own O&M manual or a Cat dealer before servicing. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar UPS 120 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 8,760 h |
|
| Every 26,280 h |
|
| Every 43,800 h |
|
Servicing the UPS 120 beyond the schedule
Predictive Maintenance & Fluid Analysis
The UPS 120 carries no engine oil, coolant, or fuel to sample - its only lubricated wear item is the flywheel vacuum pump oil, checked annually alongside pump run time. Real predictive maintenance here is electrical: trend DC bus voltage, harmonic distortion, and converter temperature through the touch-screen or remote monitoring link. Rising vacuum-chamber pressure or a shift in bearing vibration signals wear before a fault trips the unit to bypass. Log readings at every PM visit and compare against the original commissioning baseline.
Corrective & Common Repairs
Most UPS 120 service calls trace to the static bypass switch, input and output contactors, or nuisance transfers caused by over-sensitive voltage and frequency thresholds. Pitted contactor contacts and degraded SCR firing in the static disconnect switch are the common wear-driven repairs, and both sit in the input and output cabinet, not the flywheel housing. Communication faults over Modbus, Ethernet, or the remote status panel are frequent low-cost fixes. A unit stuck on bypass usually points to the utility converter's IGBT gating rather than the flywheel.
Overhaul & Rebuild Points
There is no engine to overhaul. The flywheel module's major rebuild points are its vacuum pump, replaced after roughly 8 to 10 years of continuous duty, and its bearing set, changed on a multi-year factory interval since magnetic lift only partially unloads the bearings during operation. Budget for IGBT module and capacitor bank replacement in the utility and flywheel converters as the electronics reach end of life. A full rebuild restores the cabinet to near-factory ride-through performance without replacing the frame.
Seasonal & Environment Servicing
The UPS 120 is rated to operate up to 40°C (104°F) and to store between -25°C and 70°C (-13°F to 158°F), so seasonal service centers on room-condition control, not weather exposure. Confirm plant HVAC keeps the room within rated humidity, 5 to 95 percent non-condensing, before each cooling season, and clean intake filters more often in dusty or high-heat environments since converter cooling fans work harder above roughly 30°C. Verify altitude derating if the installation sits above roughly 900 m (3,000 ft).
UPS 120 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 240-2526 | Filter Element-Encl Air | Air intake service | Check fitment → |
| 180-6264 | Filter Element As-Encl Air | Air intake service | Check fitment → |
| 180-6265 | Filter Element As-Encl Air | Air intake service | Check fitment → |
| 259-3199 | Board As-Circuit | Scheduled service item | Check fitment → |
| 180-6228 | Board As | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
UPS 120 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Input Voltage Fault (RMS out of tolerance) | Input AC voltage RMS value has drifted outside the programmed tolerance window, sampled every fifth cycle | Utility sag, brownout, or upstream distribution fault; loose or corroded input terminal connections | Check incoming utility voltage at the input terminals with a meter, verify input tolerance settings on the touch-screen, inspect input contactor and wiring |
| Input Voltage Transient Fault | Instantaneous input voltage sample deviates from the stored reference sine wave beyond the programmed limit, triggering a fast transfer to flywheel discharge | Lightning-induced surge, switching transient on the utility or generator feed, nearby large motor starting | Review event log timestamp against known site switching events, inspect surge protection devices upstream, confirm unit returned to normal operation after the transient cleared |
| DC Bus Undervoltage | DC bus voltage between the utility converter and flywheel converter has decayed below the preprogrammed threshold, indicating current cannot be drawn from the input even though input voltage reads nominal | Failed or fault-tripped upstream breaker, blown input fuse, high source impedance limiting available current | Verify upstream breaker and fuse status, measure available fault current at the input, inspect static disconnect switch SCRs |
| Input Frequency Fault | Measured input frequency deviates from nominal beyond the programmed band, checked every cycle against zero-crossing timing | Generator-set governor instability when running on standby power, weak or islanded utility grid segment | Check generator set governor and speed control if running on genset power, confirm utility frequency stability, review programmed frequency tolerance |
| On Bypass / Static Switch Active | Load has been transferred to the bypass path through the static disconnect switch and bypass contactor rather than being conditioned through the power stage | Manual bypass command, power-stage fault, or start-up sequence still in progress | Check touch-screen status page for the specific trip that forced bypass, confirm utility converter and flywheel converter status before returning to normal mode |
| Flywheel Undercharge / Low Speed | Flywheel speed has not reached the minimum charged threshold needed to support full ride-through, so available ride-through time is reduced | Recent discharge event without a completed recharge cycle, flywheel charging circuit fault, bearing drag | Allow the programmed recharge cycle to complete, verify recharge power setting, inspect flywheel converter and bearing system if charge time is abnormally long |
| Output Overload | Load current has exceeded the unit's rated overload capability for the applicable time window | Connected load exceeds the module's kVA/kW rating, non-linear load drawing high peak current, downstream fault | Check connected load against nameplate rating, inspect downstream distribution for a fault, reduce load or add parallel modules if sized correctly |
| Emergency Power Off (EPO) Activated | Local or remote EPO input has been triggered, immediately de-energizing the UPS output | Manual EPO pushbutton pressed, remote EPO contact closed by a building fire/safety system | Confirm no safety hazard exists, reset the EPO circuit per the unit's start-up procedure, have a trained Cat UPS technician verify the unit before re-energizing |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
UPS 120 attachments & work tools
Machine type note
The UPS 120 is a stationary flywheel-based uninterruptible power supply (UPS) frame, not a mobile machine. It sits in the same product family as the UPS 150, 250, 300, 301, 500, 600, 750 and 900 frames, sharing one electrical panel/parts manual set across the line. There are no mechanical work tools, buckets, or quick-couplers for this class; "attachments" below means factory/field-installable electrical option modules.
Static bypass and bypass cabinet
A thyristor (SCR) static bypass switch is standard on this class, isolating the critical load onto utility power when input goes out of tolerance so the flywheel can support the load. A companion electrically operated bypass breaker/contactor and a maintenance-bypass cabinet option let the load be fed around the UPS entirely for service.
Multi-module paralleling (MMU) cabinets
Frames in this family can be paralleled through MMU connection and MMU isolation cabinets for N+1 redundancy or capacity growth, with published paralleling up to several flywheel modules on larger frames. Smaller frames such as the 120 typically ship single-module; paralleling capability for this specific size is not separately documented and should be confirmed with the dealer configuration guide.
Isolation / dual-output transformers
Optional isolation transformers (including bypass isolation transformers) are offered to re-reference the UPS output neutral to ground, used where four-pole transfer switching is installed between utility and standby generator. Dual-output cabinet arrangements are also listed for the family; whether a given project needs a transformer varies by site electrical code and configuration.
Generator-set start module
An optional 24 VDC generator-set start module lets the UPS signal a standby engine-generator to crank immediately on a utility loss, so the flywheel rides through until the genset assumes load. This "generator-friendly" interface is a standard offered option across the whole UPS-flywheel line, including this frame size.
Remote monitoring and communications
Option kits include an internal modem, SNMP/Modbus communication cards, a remote status panel with LED annunciation, and Ethernet/e-mail alarm notification tied to the manufacturer's monitoring software. A Remote Emergency Power Off (REPO) contact is also offered as a field-wired safety option.
Control and annunciation panel
An integrated control/metering interface (Cat's EMCP-family control philosophy) provides local start/stop, event and alarm history, and diagnostic annunciation on the cabinet face, consistent across the UPS-flywheel family rather than unique to one frame size.
Input/output wiring configuration
Four-wire (neutral-inclusive) input and output wiring is offered as a configuration option to suit local grounding and code requirements, alongside the standard three-wire arrangement. Exact wiring options ordered depend on the site's electrical design, not a fixed factory default.
All UPS 120 assemblies by section
Every catalogued assembly group for the Caterpillar UPS 120. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Electrical And Starting System
206-8863 Adapter Gp-Communication
| 20***63 | Adapter Group-Communication | 1 |
255-6648 Adapter Gp-Communication -Ethernet Hub
| 22***95 | Adapter Group-Communication; -Ethernet Hub | 1 |
| 25***48 | Adapter Group-Communication; -Ethernet Hub | 1 |
228-4094 Adapter Gp-Communication -Ethernet
| 22***94 | Adapter Group-Communication; -Ethernet | 1 |
| 22***05 | Adapter Group-Communication; -Ethernet Hub | 1 |
228-4105 Adapter Gp-Communication -Ethernet Hub
| 22***95 | Adapter Group-Communication; -Ethernet Hub | 1 |
| 22***05 | Adapter Group-Communication; -Ethernet Hub | 1 |
| 26***28 | Cable; (6-Foot) | 1 |
255-6649 Adapter Gp-Communication -Ethernet Hub
| 22***05 | Adapter Group-Communication; -Ethernet Hub | 1 |
| 25***49 | Adapter Group-Communication; -Ethernet Hub | 1 |
255-6646 Adapter Gp-Communication -Ethernet Hub
| 24***09 | Transformer | 1 |
| 25***46 | Adapter Group-Communication; -Ethernet Hub | 1 |
| 30***89 | Adapter-Communication; (Ethernet Hub), Hexagon Head Cap Screw; M10 X 1.50 X 55 | 1 |
228-4095 Adapter Gp-Communication -Ethernet Hub
| 22***95 | Adapter Group-Communication; -Ethernet Hub | 1 |
255-6647 Adapter Gp-Communication -Ethernet Hub
| 22***05 | Adapter Group-Communication; -Ethernet Hub | 1 |
| 24***09 | Transformer | 1 |
| 25***47 | Adapter Group-Communication; -Ethernet Hub | 1 |
228-4089 Adapter Gp-Communication -Ethernet
| 22***89 | Adapter Group-Communication; -Ethernet | 1 |
| 22***05 | Adapter Group-Communication; -Ethernet Hub | 1 |
| 24***09 | Transformer | 1 |
228-4090 Adapter Gp-Communication -Ethernet
| 22***90 | Adapter Group-Communication; -Ethernet | 1 |
| 22***95 | Adapter Group-Communication; -Ethernet Hub | 1 |
248-8796 Adapter Gp-Communication -Ethernet
| 24***96 | Adapter Group-Communication; -Ethernet | 1 |
259-3199 Board As-Circuit -Emi Filter
| 24***51 | Capacitor | 6 |
| 25***99 | Board As-Circuit; -Emi Filter | 1 |
259-3201 Board As-Circuit -Interface
| 24***46 | Fuse; (3.15-Ampere) | 1 |
| 25***01 | Board As-Circuit; -Interface | 1 |
226-5486 Board As-Circuit -System I/O, Daughter
| 20***26 | Resistor; -Termination | 1 |
| 22***86 | Board As-Circuit; -System I/O, Daughter | 1 |
| 23***95 | Connector | 1 |
242-7424 Board As-Circuit
| 24***24 | Board As-Circuit | 1 |
201-2706 Board As-Circuit -Power Distribution
| 18***54 | Fuse; (20-Ampere)(Output) | 2 |
| 19***99 | Fuse; (10-Ampere) | 4 |
| 20***67 | Fuse; (1-Ampere) | 2 |
243-2250 Board As-Circuit -Controller
| 23***29 | Battery; (Lithium) | 1 |
| 24***50 | Board As-Circuit; -Controller | 1 |
226-5485 Board As-Circuit -System I/O, Daughter
| 20***59 | Cable As | 1 |
| 20***60 | Cable As | 1 |
| 22***85 | Board As-Circuit; -System I/O, Daughter | 1 |
201-2188 Board As-Circuit -System Input/Output
| 18***60 | Fuse; (2-Ampere) | 4 |
| 19***04 | Fuse; (3-Ampere) | 1 |
| 20***88 | Board As-Circuit; -System Input/Output | 1 |
242-9378 Board As-Circuit -Fan Monitor
| 24***46 | Fuse; (3.15-Ampere) | 6 |
| 24***78 | Board As-Circuit; -Fan Monitor | 1 |
180-6221 Board As-Circuit -Static Switch Interface
| 18***21 | Board As-Circuit; -Static Switch Interface | 1 |
| 29***60 | Cable As | 1 |
243-2251 Board As-Circuit -Controller
| 20***71 | Diskette | 1 |
| 20***76 | Diskette | 1 |
| 23***29 | Battery; (Lithium) | 1 |
201-2605 Board As-Circuit -Fan Monitor
| 20***05 | Board As-Circuit; -Fan Monitor | 1 |
| 24***46 | Fuse; (3.15-Ampere) | 6 |
201-3177 Board As-Circuit -Power Distribution
| 18***55 | Fuse; (3-Ampere)(Output) | 5 |
| 20***67 | Fuse; (1-Ampere) | 5 |
| 20***69 | Fuse; (2-Ampere) | 1 |
201-2190 Board As-Circuit -System Input/Output
| 18***60 | Fuse; (2-Ampere) | 2 |
| 20***73 | Fuse; (1-Ampere) | 1 |
| 20***90 | Board As-Circuit; -System Input/Output | 1 |
235-6333 Board As-Circuit -Electro Magnetic Interference
| 23***51 | Capacitor | 3 |
| 23***33 | Board As-Circuit; -Electro Magnetic Interference | 1 |
201-2604 Board As-Circuit -Ac Interface
| 18***60 | Fuse; (2-Ampere) | 1 |
| 20***04 | Board As-Circuit; -Ac Interface | 1 |
| 23***53 | Fuse; (5-Ampere) | 4 |
204-0303 Box Gp-Connection
| 18***28 | Board As; (Emi Filter)(Flywheel) | 1 |
| 19***75 | Fuse; (1000-Ampere) | 1 |
| 19***78 | Capacitor; (50vdc, Scr Term) | 2 |
207-8642 Box Gp-Connection
| 20***42 | Box Group-Connection | 1 |
| 23***19 | Clamp | 1 |
| 23***20 | Diode | 2 |
206-5380 Box Gp-Connection
| 20***80 | Box Group-Connection | 1 |
| 23***95 | Parts Group-Miscellaneous; (Genset Start Driver) | 1 |
| 23***34 | Parts Group-Miscellaneous; (Genset Start Driver) | 1 |
208-2265 Box Gp-Junction
| 20***65 | Box Group-Junction | 1 |
205-3120 Bus Bar Gp
| 20***20 | Bus Bar Group | 1 |
203-4297 Cable As-Communication
| 20***97 | Cable As-Communication | 1 |
203-4227 Cable As-Communication
| 20***27 | Cable As-Communication | 1 |
203-4296 Cable As-Communication
| 20***96 | Cable As-Communication | 1 |
203-5546 Cable Gp
| 18***67 | Cable As-Ribbon; (Ac Interface) | 1 |
| 18***70 | Cable As-Ribbon; (System Input, Output 1) | 1 |
| 18***72 | Cable As-Ribbon; (Static Switch) | 1 |
249-5617 Circuit Breaker Gp -Generator Start Module
| 24***17 | Circuit Breaker Group; -Generator Start Module | 1 |
| 25***67 | Cable As | 1 |
| 29***26 | Circuit Breaker; (40-Ampere) | 1 |
249-5620 Circuit Breaker Gp -Generator Start, Dual
| 24***20 | Circuit Breaker Group; -Generator Start, Dual | 1 |
| 25***67 | Cable As | 2 |
| 29***26 | Circuit Breaker; (40-Ampere) | 2 |
249-5622 Circuit Breaker Gp -Generator Start, Dual
| 24***22 | Circuit Breaker Group; -Generator Start, Dual | 1 |
| 25***67 | Cable As | 2 |
| 29***26 | Circuit Breaker; (40-Ampere) | 2 |
249-5618 Circuit Breaker Gp -Generator Start, Dual
| 24***18 | Circuit Breaker Group; -Generator Start, Dual | 1 |
| 25***67 | Cable As | 2 |
| 29***59 | Kit-Circuit Breaker; (40-Ampere) | 2 |
249-5621 Circuit Breaker Gp -Generator Start Module
| 24***21 | Circuit Breaker Group; -Generator Start Module | 1 |
| 25***67 | Cable As | 1 |
| 29***26 | Circuit Breaker; (40-Ampere) | 1 |
249-5619 Circuit Breaker Gp -Generator Start Module
| 24***19 | Circuit Breaker Group; -Generator Start Module | 1 |
| 25***67 | Cable As | 1 |
| 29***26 | Circuit Breaker; (40-Ampere) | 1 |
226-4886 Conduit Gp
| 22***86 | Conduit Group | 1 |
| 27***83 | Cable; (24-Ga) | 2 |
226-4887 Conduit Gp
| 22***87 | Conduit Group | 1 |
| 27***83 | Cable; (24-Ga) | 2 |
| 27***84 | Cable; (24-Ga) | 1 |
226-4883 Conduit Gp
| 22***83 | Conduit Group | 1 |
| 27***83 | Cable; (24-Ga) | 2 |
207-4320 Conduit Gp
| 20***20 | Conduit Group | 1 |
| 22***86 | Conduit Group | 1 |
207-4315 Conduit Gp
| 20***15 | Conduit Group | 1 |
| 22***83 | Conduit Group | 1 |
207-4323 Conduit Gp
| 20***23 | Conduit Group | 1 |
| 22***87 | Conduit Group | 1 |
207-8641 Conduit Gp
| 20***41 | Conduit Group | 1 |
| 22***88 | Conduit Group; (Fourth Enclosure) | 1 |
203-4683 Conduit Gp
| 20***83 | Conduit Group, .. Cyl. | 1 |
203-5456 Connection Gp-Electrical
| 20***56 | Connection Group-Electrical | 1 |
| 23***75 | Harness As-Wiring; (Ground) | 1 |
| 25***84 | Panel Group-Electrical | 1 |
203-4292 Connector -Ethernet
| 20***92 | Connector; -Ethernet | 1 |
200-8330 Contact As-Electrical
| 20***30 | Contact As-Electrical | 1 |
| 24***25 | Contact | 1 |
| 24***26 | Bracket | 1 |
228-4114 Conversion Gp-Communication
| 22***14 | Conversion Group-Communication | 1 |
226-5484 Conversion Gp-Communication
| 22***84 | Conversion Group-Communication | 1 |
228-4112 Conversion Gp-Communication
| 22***12 | Conversion Group-Communication | 1 |
229-2890 Conversion Gp-Communication -Modbus Functionality
| 22***90 | Conversion Group-Communication; -Modbus Functionality | 1 |
229-2889 Conversion Gp-Communication -Protocol Functionality
| 22***89 | Conversion Group-Communication; -Protocol Functionality | 1 |
203-3971 Diskette
| 20***71 | Diskette | 1 |
203-3976 Diskette
| 20***76 | Diskette | 1 |
243-9258 Fuse Gp
| 18***54 | Fuse; (20-Ampere)(Output) | 1 |
| 19***99 | Fuse; (10-Ampere) | 2 |
| 23***55 | Fuse; (7-Ampere) | 2 |
180-6295 Ground Gp-Electrical -Electrical Drain
| 18***95 | Ground Group-Electrical; -Electrical Drain | 1 |
| 20***30 | Contact As-Electrical | 1 |
| 23***35 | Seal-O-Ring | 1 |
203-4293 Installation Gp-Adapter
| 20***93 | Installation Group-Adapter | 1 |
| 24***09 | Transformer | 1 |
| 30***89 | Adapter-Communication; (Ethernet Hub), Hexagon Head Cap Screw; M10 X 1.50 X 55 | 1 |
293-5402 Kit-Switch -Emergency Power Off
| 28***13 | Switch As-Push Button; (Emergency Power Off) | 1 |
| 29***02 | Kit-Switch; -Emergency Power Off | 1 |
293-5403 Kit-Switch -Emergency Power Off
| 28***13 | Switch As-Push Button; (Emergency Power Off) | 1 |
| 29***03 | Kit-Switch; -Emergency Power Off | 1 |
203-5458 Panel Gp-Circuit Breaker
| 20***31 | Cable As; (Thyristor) | 1 |
| 20***90 | Fuse; (600-Ampere) | 1 |
| 20***71 | Diskette | 1 |
207-8726 Resistor -Termination
| 20***26 | Resistor; -Termination | 1 |
222-5438 Resistor As
| 22***38 | Resistor As | 1 |
199-5096 Switch As -Static Bypass-Static
| 18***21 | Board As-Circuit; -Static Switch Interface | 1 |
| 19***96 | Switch As; -Static Bypass-Static | 1 |
| 20***61 | Switch; (Static) | 1 |
203-5547 Switch As -Emergency Module Off
| 20***06 | Cable As; (System Cabinet Emo) | 1 |
| 20***47 | Switch As; -Emergency Module Off | 1 |
| 22***41 | Cover; (Switch) | 1 |
259-3200 Switch As -Static Bypass
| 18***21 | Board As-Circuit; -Static Switch Interface | 1 |
| 20***39 | Cable As; (Static Switch Thermistor) | 1 |
| 24***22 | Thyristor | 3 |
251-4572 Switch As -Static Bypass
| 20***77 | Fuse; (200-Ampere) | 3 |
| 20***31 | Cable As; (Thyristor) | 1 |
| 20***06 | Board As; (Bypass Cabinet Control) | 2 |
250-5523 Switch As -Static Bypass
| 18***21 | Board As-Circuit; -Static Switch Interface | 1 |
| 20***39 | Cable As; (Static Switch Thermistor) | 1 |
| 20***89 | Suppressor As-Arc; (Static Switch) | 3 |
294-5574 Switch As-Push Button -Emergency Power Off
| 28***13 | Switch As-Push Button; (Emergency Power Off) | 1 |
| 29***74 | Switch As-Push Button; -Emergency Power Off | 1 |
294-7319 Switch As-Push Button -Emergency Power Off
| 28***13 | Switch As-Push Button; (Emergency Power Off) | 1 |
| 29***19 | Switch As-Push Button; -Emergency Power Off | 1 |
307-6546 Switch Gp-Disconnect
| 24***07 | Handle | 1 |
| 25***57 | Shaft | 1 |
| 30***46 | Switch Group-Disconnect | 1 |
203-4324 Switch Gp-Disconnect
| 20***07 | Varistor As; (Surge Protector)(Ac) | 2 |
| 20***08 | Disconnect; (400-Ampere, 3-Pole) | 6 |
| 20***24 | Switch Group-Disconnect | 1 |
203-4325 Switch Gp-Disconnect
| 20***07 | Varistor As; (Surge Protector)(Ac) | 2 |
| 20***08 | Disconnect; (400-Ampere, 3-Pole) | 8 |
| 20***25 | Switch Group-Disconnect | 1 |
203-4323 Switch Gp-Disconnect
| 20***07 | Varistor As; (Surge Protector)(Ac) | 2 |
| 20***08 | Disconnect; (400-Ampere, 3-Pole) | 4 |
| 20***23 | Switch Group-Disconnect | 1 |
183-9379 Switch Gp-Remote
| 18***79 | Switch Group-Remote | 1 |
| 25***72 | Switch-Push Button; (Remote Emergency Stop) | 1 |
254-9922 Transformer As
| 24***23 | Transformer | 1 |
| 25***22 | Transformer As | 1 |
261-1004 Varistor As
| 26***04 | Varistor As | 1 |
Enclosures, Guards And Bases
199-5106 Fan As-Circulating
| 19***06 | Fan As-Circulating | 1 |
| 20***61 | Switch-Limit; (Fan) | 1 |
| 26***63 | Impeller; (230-Volt) | 1 |
203-1007 Fan Gp-Circulating
| 19***25 | Damper As; (Fan) | 1 |
| 19***06 | Fan As-Circulating | 1 |
| 20***29 | Screen; (Fan) | 1 |
203-5452 Fastener Gp-Enclosure
| 20***52 | Fastener Group-Enclosure | 1 |
203-5451 Fastener Gp-Enclosure
| 20***51 | Fastener Group-Enclosure | 1 |
203-5453 Fastener Gp-Enclosure -Template
| 20***53 | Fastener Group-Enclosure; -Template | 1 |
258-8805 Handle As
| 24***13 | Handle; (Maintenance Bypass) | 3 |
| 25***05 | Handle As | 1 |
258-8806 Handle As
| 24***13 | Handle; (Maintenance Bypass) | 3 |
| 25***06 | Handle As | 1 |
203-4320 Kickplate
| 20***20 | Kickplate | 1 |
203-4322 Kickplate
| 20***22 | Kickplate | 1 |
203-4318 Kickplate
| 20***18 | Kickplate | 1 |
206-8862 Kickplate
| 20***62 | Kickplate | 1 |
203-4321 Kickplate
| 20***21 | Kickplate | 1 |
203-4319 Kickplate
| 20***19 | Kickplate | 1 |
Operator Station
201-7672 Control As-Synchronizing
| 20***63 | Fuse; (1.5-Ampere) | 3 |
| 20***72 | Control As-Synchronizing | 1 |
| 24***20 | Block-Fuse; (3-Pole) | 1 |
130-3349 Control Gp-Alarm Module
| 13***49 | Control Group-Alarm Module | 1 |
| 3J***54 | Packing,Preformed Part Of Kit P/N 5r***27 | 1 |
| 9S***02 | Plug-O-Ring; (Straight Thread O-Ring) | 1 |
207-8751 Conversion Gp-Load Cell
| 18***35 | Bearing As; (Upper Flywheel) | 1 |
| 20***51 | Conversion Group-Load Cell | 1 |
| 22***42 | Seal-O-Ring | 1 |
202-7507 Filter As-Electrical -Phase A
| 18***43 | Resistor As; (Bleeder) | 4 |
| 20***46 | Capacitor | 16 |
| 20***07 | Filter As-Electrical; -Phase A | 1 |
227-4834 Filter As-Electrical
| 20***28 | Capacitor | 12 |
| 22***34 | Filter As-Electrical | 1 |
222-5440 Filter As-Electrical
| 22***38 | Resistor As | 6 |
| 22***39 | Capacitor; (600vac) | 12 |
| 22***40 | Filter As-Electrical | 1 |
202-7510 Filter As-Electrical -Phase C
| 18***43 | Resistor As; (Bleeder) | 4 |
| 20***46 | Capacitor | 16 |
| 20***10 | Filter As-Electrical; -Phase C | 1 |
250-5511 Filter As-Electrical -Ac
| 24***42 | Capacitor; (600-Volt) | 12 |
| 25***11 | Filter As-Electrical; -Ac | 1 |
202-7508 Filter As-Electrical -Phase B
| 18***43 | Resistor As; (Bleeder) | 4 |
| 20***46 | Capacitor | 16 |
| 20***08 | Filter As-Electrical; -Phase B | 1 |
259-3197 Filter As-Electrical -Ac
| 24***42 | Capacitor; (600-Volt) | 6 |
| 25***97 | Filter As-Electrical; -Ac | 1 |
| 25***98 | Cable | 2 |
227-7457 Flywheel Gp-Power Supply
| 19***80 | Kit-Shim; (Includes 15-Shims)(Upper Bearing) | 1 |
| 20***52 | . Coller, Sensor-Vacuum; (Flywheel Bearing) | 1 |
| 22***41 | Screw; (5/16-18x0.875-In) | 16 |
202-9760 Flywheel Gp-Power Supply
| 18***95 | Ground Group-Electrical; -Electrical Drain | 1 |
| 20***52 | . Coller, Sensor-Vacuum; (Flywheel Bearing) | 1 |
| 20***60 | Flywheel Group-Power Supply | 1 |
244-1409 Flywheel Gp-Power Supply
| 22***41 | Screw; (5/16-18x0.875-In) | 16 |
| 22***42 | Seal-O-Ring | 1 |
| 22***90 | Kit-Shim; (Includes 5-Shims)(Lower Bearing) | 1 |
202-7596 Module As -System User Interface
| 18***86 | Cable As-Ribbon; (User Interface Lcd) | 1 |
| 20***31 | Switch-Push Button; (Emergency Module Off) | 1 |
| 20***33 | Switch; (Key)(Emergency Stop) | 1 |
201-2679 Module As -Systems User Interface
| 20***31 | Switch-Push Button; (Emergency Module Off) | 1 |
| 20***32 | Switch-Push Button; (Horn Silence) | 1 |
| 20***33 | Switch; (Key)(Emergency Stop) | 1 |
259-3196 Module As -Utility
| 24***67 | Capacitor; (1200-Volt) | 3 |
| 24***68 | Capacitor; (500-Volt) | 6 |
| 25***96 | Module As; -Utility | 1 |
250-5510 Module As -Field Coil Driver
| 25***10 | Module As; -Field Coil Driver | 1 |
259-3195 Module As -Controller
| 24***67 | Capacitor; (1200-Volt) | 3 |
| 24***68 | Capacitor; (500-Volt) | 6 |
| 25***95 | Module As; -Controller | 1 |
250-7959 Module Gp-Alarm
| 13***49 | Control Group-Alarm Module | 1 |
| 19***39 | Film-Control Panel | 1 |
| 24***68 | Switch-Push Button; (Alarm Test) | 1 |
200-6276 Module Gp-Converter -Lh
| 20***76 | Module Group-Converter; -Lh | 1 |
| 20***90 | Board As; (Skiip Interface) | 1 |
| 23***64 | Module-Converter; (Lh)(Left Skiip) | 1 |
200-6274 Module Gp-Converter -Rh
| 20***74 | Module Group-Converter; -Rh | 1 |
| 20***90 | Board As; (Skiip Interface) | 1 |
| 32***95 | Board-Electronic; (Right Skiip) | 1 |
203-2745 Module Gp-Maintenance Bypass
| 20***45 | Module Group-Maintenance Bypass | 1 |
| 24***07 | Handle | 3 |
| 25***18 | Panel Group-Electrical | 1 |
209-5506 Module Gp-Maintenance Bypass
| 20***06 | Module Group-Maintenance Bypass | 1 |
| 24***07 | Handle | 3 |
| 25***18 | Panel Group-Electrical | 1 |
203-2747 Module Gp-Static Bypass
| 20***77 | Fuse; (200-Ampere) | 3 |
| 20***38 | Module-Thyristor | 1 |
| 20***69 | Contactor | 1 |
203-5446 Module Gp-Static Bypass
| 18***21 | Board As-Circuit; -Static Switch Interface | 1 |
| 20***36 | Thyristor | 3 |
| 20***90 | Fuse; (600-Ampere) | 3 |
263-3457 Module-External Modem
| 24***09 | Transformer | 1 |
| 26***57 | Module-External Modem | 1 |
206-8859 Module-External Modem -Interface
| 20***59 | Module-External Modem; -Interface | 1 |
203-4295 Module-External Modem -Interface
| 20***95 | Module-External Modem; -Interface | 1 |
| 24***09 | Transformer | 1 |
263-3721 Module-External Modem
| 24***09 | Transformer | 1 |
| 26***21 | Module-External Modem | 1 |
203-4222 Module-External Modem -Interface
| 20***22 | Module-External Modem; -Interface | 1 |
| 24***09 | Transformer | 1 |
206-8861 Module-External Modem
| 20***88 | Board As-Circuit; -System Input/Output | 1 |
| 20***27 | Cable As-Communication | 1 |
| 20***61 | Module-External Modem | 1 |
263-3458 Module-External Modem
| 24***09 | Transformer | 1 |
| 26***58 | Module-External Modem | 1 |
206-8857 Module-External Modem -Interface
| 20***57 | Module-External Modem; -Interface | 1 |
203-3975 Module-External Modem -Interface
| 20***75 | Module-External Modem; -Interface | 1 |
| 24***09 | Transformer | 1 |
263-3455 Module-External Modem
| 24***09 | Transformer | 1 |
| 26***55 | Module-External Modem | 1 |
206-8860 Module-External Modem -Interface
| 20***88 | Board As-Circuit; -System Input/Output | 1 |
| 20***60 | Module-External Modem; -Interface | 1 |
| 24***09 | Transformer | 1 |
203-3974 Module-External Modem -Interface
| 20***74 | Module-External Modem; -Interface | 1 |
| 24***09 | Transformer | 1 |
206-8858 Module-External Modem -Interface
| 20***58 | Module-External Modem; -Interface | 1 |
203-4221 Module-External Modem -Interface
| 20***21 | Module-External Modem; -Interface | 1 |
206-8855 Module-Internal Modem
| 20***55 | Module-Internal Modem | 1 |
| 24***09 | Transformer | 1 |
| 24***54 | Modem As | 1 |
203-3972 Module-Internal Modem
| 20***72 | Module-Internal Modem | 1 |
| 24***09 | Transformer | 1 |
| 24***55 | Modem As | 1 |
263-3459 Module-Internal Modem
| 20***26 | Cable As-Communication | 1 |
| 24***09 | Transformer | 1 |
| 24***54 | Modem As | 1 |
203-4225 Module-Internal Modem
| 20***25 | Module-Internal Modem | 1 |
| 24***09 | Transformer | 1 |
| 24***55 | Modem As | 1 |
203-3973 Module-Internal Modem
| 20***73 | Module-Internal Modem | 1 |
| 24***09 | Transformer | 1 |
| 24***54 | Modem As | 1 |
206-8852 Module-Internal Modem
| 20***52 | Module-Internal Modem | 1 |
| 24***09 | Transformer | 1 |
| 24***54 | Modem As | 1 |
263-3453 Module-Internal Modem
| 24***09 | Transformer | 1 |
| 24***55 | Modem As | 1 |
| 26***53 | Module-Internal Modem | 1 |
263-3330 Module-Internal Modem
| 20***26 | Cable As-Communication | 1 |
| 24***09 | Transformer | 1 |
| 24***55 | Modem As | 1 |
263-3454 Module-Internal Modem
| 24***09 | Transformer | 1 |
| 24***54 | Modem As | 1 |
| 26***54 | Module-Internal Modem | 1 |
206-8856 Module-Internal Modem
| 20***56 | Module-Internal Modem | 1 |
| 24***09 | Transformer | 1 |
| 24***55 | Modem As | 1 |
206-8854 Module-Internal Modem
| 20***54 | Module-Internal Modem | 1 |
| 24***09 | Transformer | 1 |
| 24***55 | Modem As | 1 |
203-4224 Module-Internal Modem
| 20***24 | Module-Internal Modem | 1 |
| 24***09 | Transformer | 1 |
| 24***54 | Modem As | 1 |
236-4958 Panel Ar-Control
| 23***48 | Panel Group-Control; -Generator Start | 2 |
| 23***50 | Bracket | 4 |
| 23***58 | Panel Ar-Control; -Generator Start, Dual | 1 |
236-4955 Panel Ar-Control
| 23***48 | Panel Group-Control; -Generator Start | 1 |
| 23***50 | Bracket | 2 |
| 23***55 | Panel Ar-Control | 1 |
236-4956 Panel Ar-Control
| 23***48 | Panel Group-Control; -Generator Start | 2 |
| 23***50 | Bracket | 4 |
| 23***56 | Panel Ar-Control | 1 |
236-4957 Panel Ar-Control
| 23***48 | Panel Group-Control; -Generator Start | 1 |
| 23***50 | Bracket | 2 |
| 23***57 | Panel Ar-Control; -Generator Start, Single | 1 |
240-2510 Panel As-Electrical -Power Supply
| 20***77 | Fuse; (200-Ampere) | 1 |
| 20***69 | Contactor | 1 |
| 20***69 | Indicator; (Fuse) | 1 |
256-3008 Panel As-Electrical -Static Bypass
| 18***21 | Board As-Circuit; -Static Switch Interface | 1 |
| 20***90 | Fuse; (600-Ampere) | 3 |
| 20***69 | Indicator; (Fuse) | 3 |
252-4932 Panel As-Electrical -Lh
| 20***77 | Fuse; (200-Ampere) | 1 |
| 20***69 | Indicator; (Fuse) | 1 |
| 22***07 | Board As-Circuit; (Zig Zag Controller) | 1 |
230-7666 Panel Gp-Annunciator
| 23***66 | Panel Group-Annunciator | 1 |
| 25***59 | Module Group-Alarm | 1 |
203-4299 Panel Gp-Annunciator
| 20***59 | Cable As | 1 |
| 20***60 | Cable As | 1 |
| 20***99 | Panel Group-Annunciator | 1 |
233-7648 Panel Gp-Control
| 23***48 | Panel Group-Control; -Generator Start | 1 |
| 23***53 | Capacitor | 2 |
| 23***57 | Fuse; (0.25-Ampere) | 2 |
251-9618 Panel Gp-Electrical
| 20***82 | Switch Group-Disconnect | 3 |
| 24***81 | Holder; (Fuse) | 3 |
| 25***57 | Shaft | 2 |
227-4833 Panel Gp-Electrical
| 22***33 | Panel Group-Electrical | 1 |
| 22***34 | Filter As-Electrical | 1 |
| 22***35 | Resistor | 2 |
258-8802 Panel Gp-Electrical
| 25***02 | Panel Group-Electrical | 1 |
| 25***03 | Panel Group-Electrical; -Disconnect Switch | 1 |
| 25***06 | Handle As | 1 |
202-7511 Panel Gp-Electrical
| 18***09 | Resistor; (13-Watt) | 12 |
| 18***22 | Board As; (Dc Interface) | 1 |
| 20***28 | Capacitor | 12 |
9e-5987 Panel Gp-Electrical
| 24***07 | Handle | 3 |
| 24***81 | Holder; (Fuse) | 4 |
| 25***58 | Switch As; (400-Ampere, 3-Phase, 4-Pole) | 3 |
203-5457 Panel Gp-Electrical
| 20***57 | Panel Group-Electrical | 1 |
| 25***32 | Panel As-Electrical; -Lh | 1 |
| 25***22 | Transformer As | 1 |
251-3584 Panel Gp-Electrical
| 23***32 | Relay; (1.8-Ampere, 3-Pole)(Overload) | 1 |
| 23***34 | Block-Terminal | 1 |
| 23***72 | Transformer; (10-Ampere) | 1 |
236-4176 Panel Gp-Electrical
| 23***32 | Relay; (1.8-Ampere, 3-Pole)(Overload) | 1 |
| 23***34 | Block-Terminal | 1 |
| 23***72 | Transformer; (10-Ampere) | 1 |
256-7282 Panel Gp-Electrical
| 25***82 | Panel Group-Electrical | 1 |
| 25***03 | Panel Group-Electrical; -Disconnect Switch | 1 |
| 25***05 | Handle As | 1 |
203-5455 Panel Gp-Electrical
| 20***55 | Panel Group-Electrical | 1 |
| 23***76 | Panel Group-Electrical | 1 |
250-5521 Panel Gp-Electrical
| 20***32 | Power Supply; (350-Watt) | 2 |
| 25***21 | Panel Group-Electrical | 1 |
| 25***07 | Capacitor | 2 |
258-9961 Panel Gp-Electrical
| 24***10 | Panel As-Electrical; -Power Supply | 1 |
| 25***22 | Transformer As | 1 |
| 25***61 | Panel Group-Electrical | 1 |
258-8803 Panel Gp-Electrical -Disconnect Switch
| 24***12 | Switch-Disconnect; (Maintenance Bypass) | 3 |
| 24***14 | Shaft | 1 |
| 24***15 | Shaft | 2 |
250-6034 Panel Gp-Power Supply
| 25***34 | Panel Group-Power Supply | 1 |
| 25***59 | Module Group-Alarm | 1 |
259-3194 Panel Gp-Power Supply
| 18***50 | Fuse; (300-Ampere)(Utility) | 3 |
| 20***65 | Fuse; (4-Ampere) | 2 |
| 20***66 | Fuse; (7-Ampere) | 2 |
230-7667 Panel Gp-Power Supply
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
| 19***89 | Contactor | 2 |
255-0608 Panel Gp-Power Supply
| 25***08 | Panel Group-Power Supply | 1 |
| 25***66 | Panel Group-Power Supply | 1 |
| 25***94 | Panel Group-Power Supply | 1 |
258-9865 Panel Gp-Power Supply
| 20***48 | Panel-Access; (Top) | 1 |
| 24***11 | Capacitor; (Oil-Filled) | 1 |
| 24***24 | Contactor | 1 |
203-3912 Panel Gp-Power Supply
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
| 19***89 | Contactor | 2 |
203-4382 Panel Gp-Power Supply
| 18***55 | Fuse; (3-Ampere)(Output) | 3 |
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
203-4383 Panel Gp-Power Supply
| 18***55 | Fuse; (3-Ampere)(Output) | 3 |
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
251-0043 Panel Gp-Power Supply
| 20***65 | Fuse; (4-Ampere) | 2 |
| 20***66 | Fuse; (7-Ampere) | 2 |
| 20***74 | Module Group-Converter; -Rh | 3 |
237-0175 Panel Gp-Power Supply
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
| 19***97 | Fuse; (3-Ampere) | 2 |
250-3438 Panel Gp-Power Supply
| 19***97 | Fuse; (3-Ampere) | 2 |
| 20***67 | Fuse; (1-Ampere) | 3 |
| 20***61 | Panel As; (Input/Output) | 1 |
248-5465 Panel Gp-Power Supply
| 20***65 | Fuse; (4-Ampere) | 2 |
| 20***66 | Fuse; (7-Ampere) | 2 |
| 20***76 | Module Group-Converter; -Lh | 3 |
203-4385 Panel Gp-Power Supply
| 18***55 | Fuse; (3-Ampere)(Output) | 3 |
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
203-4375 Panel Gp-Power Supply
| 20***07 | Varistor As; (Surge Protector)(Ac) | 2 |
| 20***08 | Disconnect; (400-Ampere, 3-Pole) | 8 |
| 20***75 | Panel Group-Power Supply | 1 |
266-5937 Panel Gp-Power Supply
| 19***97 | Fuse; (3-Ampere) | 2 |
| 20***67 | Fuse; (1-Ampere) | 3 |
| 20***69 | Circuit Breaker As; (1200-Ampere) | 1 |
251-2175 Panel Gp-Power Supply
| 20***65 | Fuse; (4-Ampere) | 2 |
| 20***66 | Fuse; (7-Ampere) | 2 |
| 20***74 | Module Group-Converter; -Rh | 3 |
266-5936 Panel Gp-Power Supply
| 19***97 | Fuse; (3-Ampere) | 2 |
| 20***67 | Fuse; (1-Ampere) | 3 |
| 20***69 | Circuit Breaker As; (1200-Ampere) | 1 |
248-5466 Panel Gp-Power Supply
| 20***48 | Panel-Access; (Top) | 1 |
| 24***11 | Capacitor; (Oil-Filled) | 1 |
| 24***11 | Handle; (Door) | 1 |
202-7658 Panel Gp-Power Supply
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
| 19***89 | Contactor | 2 |
255-0609 Panel Gp-Power Supply
| 25***09 | Panel Group-Power Supply | 1 |
| 25***65 | Panel Group-Power Supply | 1 |
| 25***94 | Panel Group-Power Supply | 1 |
250-3439 Panel Gp-Power Supply
| 19***97 | Fuse; (3-Ampere) | 2 |
| 20***67 | Fuse; (1-Ampere) | 3 |
| 20***69 | Circuit Breaker As; (1200-Ampere) | 2 |
251-2177 Panel Gp-Power Supply
| 19***97 | Fuse; (3-Ampere) | 2 |
| 20***67 | Fuse; (1-Ampere) | 3 |
| 20***61 | Panel As; (Input/Output) | 1 |
250-3437 Panel Gp-Power Supply
| 19***97 | Fuse; (3-Ampere) | 2 |
| 20***67 | Fuse; (1-Ampere) | 3 |
| 20***69 | Circuit Breaker As; (1200-Ampere) | 1 |
202-7659 Panel Gp-Power Supply
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
| 19***97 | Fuse; (3-Ampere) | 4 |
203-4374 Panel Gp-Power Supply
| 20***07 | Varistor As; (Surge Protector)(Ac) | 2 |
| 20***08 | Disconnect; (400-Ampere, 3-Pole) | 6 |
| 20***74 | Panel Group-Power Supply | 1 |
252-0570 Panel Gp-Power Supply
| 19***97 | Fuse; (3-Ampere) | 4 |
| 20***63 | Fuse; (1.5-Ampere) | 2 |
| 20***49 | Power Supply; (150-Watt) | 2 |
202-7660 Panel Gp-Power Supply
| 20***40 | Door-Front | 1 |
| 20***48 | Panel-Access; (Top) | 1 |
| 20***80 | Panel As-Side | 1 |
203-4384 Panel Gp-Power Supply
| 18***55 | Fuse; (3-Ampere)(Output) | 3 |
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
319-4158 Panel Gp-Power Supply
| 18***46 | Kit-Pump; (Vacuum) | 1 |
| 19***06 | Fan As-Circulating | 6 |
| 20***65 | Fuse; (4-Ampere) | 2 |
248-5467 Panel Gp-Power Supply
| 24***23 | Transformer | 1 |
| 24***11 | Handle; (Door) | 1 |
| 24***24 | Ring | 1 |
203-4373 Panel Gp-Power Supply
| 20***07 | Varistor As; (Surge Protector)(Ac) | 2 |
| 20***08 | Disconnect; (400-Ampere, 3-Pole) | 4 |
| 20***73 | Panel Group-Power Supply | 1 |
258-9866 Panel Gp-Power Supply
| 24***11 | Capacitor; (Oil-Filled) | 1 |
| 24***23 | Transformer | 1 |
| 24***24 | Contactor | 1 |
252-5011 Panel Gp-Power Supply
| 19***97 | Fuse; (3-Ampere) | 2 |
| 20***67 | Fuse; (1-Ampere) | 3 |
| 20***69 | Circuit Breaker As; (1200-Ampere) | 2 |
202-7646 Power Gp-Uninterruptible
| 20***59 | Film Group | 1 |
| 20***46 | Power Group-Uninterruptible | 1 |
| 20***58 | Panel Group-Power Supply | 1 |
202-7648 Power Gp-Uninterruptible
| 20***58 | Film Group | 1 |
| 20***48 | Power Group-Uninterruptible | 1 |
| 20***58 | Panel Group-Power Supply | 2 |
202-7645 Power Gp-Uninterruptible
| 20***45 | Power Group-Uninterruptible | 1 |
| 20***58 | Panel Group-Circuit Breaker | 1 |
| 22***83 | Conduit Group | 1 |
202-7644 Power Gp-Uninterruptible
| 20***44 | Power Group-Uninterruptible | 1 |
| 20***60 | Panel Group-Power Supply | 1 |
| 20***12 | Panel Group-Power Supply | 1 |
202-7649 Power Gp-Uninterruptible
| 20***57 | Film Group | 1 |
| 20***49 | Power Group-Uninterruptible | 1 |
| 20***58 | Panel Group-Power Supply | 3 |
202-7643 Power Gp-Uninterruptible
| 20***43 | . Gear; Internal, Power Group-Uninterruptible | 1 |
| 20***60 | Panel Group-Power Supply | 1 |
| 20***12 | Panel Group-Power Supply | 1 |
204-0304 Power Gp-Uninterruptible
| 18***64 | Filter Element As-Encl Air | 1 |
| 18***65 | Filter Element As-Encl Air | 1 |
| 19***89 | Contactor | 2 |
202-7650 Power Gp-Uninterruptible
| 20***57 | Film Group | 1 |
| 20***50 | Power Group-Uninterruptible | 1 |
| 20***58 | Panel Group-Power Supply | 3 |
202-7647 Power Gp-Uninterruptible
| 20***58 | Film Group | 1 |
| 20***47 | Power Group-Uninterruptible, .. Axle | 1 |
| 20***58 | Panel Group-Power Supply | 2 |
234-7687 Power Supply Gp
| 20***32 | Power Supply; (350-Watt) | 1 |
| 23***87 | Power Supply Group | 1 |
| 23***88 | Capacitor; (450-Volt) | 2 |
231-3504 Pump & Motor Gp-Vacuum
| 18***46 | Kit-Pump; (Vacuum) | 1 |
| 23***04 | Pump & Motor Group-Vacuum | 1 |
| 24***65 | Ring | 4 |
Service Equipment And Supplies
200-1857 Film Gp
| 13***39 | Film-Stripe; (Red)(625cm) | 0 |
| 20***44 | Film; (Electric Power) | 1 |
| 20***57 | Film Group | 1 |
200-1856 Film Gp
| 13***39 | Film-Stripe; (Red)(625cm) | 0 |
| 20***44 | Film; (Electric Power) | 1 |
| 20***56 | Film Group | 1 |
200-1859 Film Gp
| 13***39 | Film-Stripe; (Red)(625cm) | 0 |
| 20***44 | Film; (Electric Power) | 1 |
| 20***59 | Film Group | 1 |
200-1858 Film Gp
| 13***39 | Film-Stripe; (Red)(625cm) | 0 |
| 20***44 | Film; (Electric Power) | 1 |
| 20***58 | Film Group | 1 |
200-1845 Film Gp
| 12***94 | Film-Stripe; (Black)(56cm) | 0 |
| 20***24 | Film; (Electric Power) | 1 |
| 20***25 | Film-Stripe; (Red)(44cm) | 0 |
203-4716 Film Gp
| 20***16 | Film Group | 1 |
| 22***51 | Film; (Cat) | 1 |
| 22***52 | Film; (Electric Power) | 1 |
245-0559 Kit-Sensor & Mounting
| 24***59 | Kit-Sensor & Mounting | 1 |
250-6032 Parts Gp-Miscellaneous
| 18***55 | Fuse; (3-Ampere)(Output) | 10 |
| 18***60 | Fuse; (2-Ampere) | 10 |
| 19***04 | Fuse; (3-Ampere) | 10 |
203-5447 Parts Gp-Miscellaneous
| 18***22 | Board As; (Dc Interface) | 1 |
| 18***49 | Fuse; (250-Ampere)(Flywheel) | 3 |
| 18***54 | Fuse; (20-Ampere)(Output) | 5 |
261-8122 Parts Gp-Miscellaneous
| 18***21 | Board As-Circuit; -Static Switch Interface | 1 |
| 18***50 | Fuse; (300-Ampere)(Utility) | 3 |
| 18***54 | Fuse; (20-Ampere)(Output) | 2 |
203-5448 Parts Gp-Miscellaneous
| 18***55 | Fuse; (3-Ampere)(Output) | 10 |
| 18***60 | Fuse; (2-Ampere) | 10 |
| 18***61 | Fuse; (5-Ampere) | 10 |
250-6033 Parts Gp-Miscellaneous
| 18***54 | Fuse; (20-Ampere)(Output) | 5 |
| 18***55 | Fuse; (3-Ampere)(Output) | 5 |
| 18***60 | Fuse; (2-Ampere) | 10 |
230-4162 Parts Gp-Miscellaneous
| 18***55 | Fuse; (3-Ampere)(Output) | 10 |
| 18***60 | Fuse; (2-Ampere) | 10 |
| 18***61 | Fuse; (5-Ampere) | 10 |
230-4161 Parts Gp-Miscellaneous
| 18***54 | Fuse; (20-Ampere)(Output) | 5 |
| 18***55 | Fuse; (3-Ampere)(Output) | 5 |
| 18***60 | Fuse; (2-Ampere) | 10 |
Frequently asked questions
What engine does the Caterpillar UPS 120 use?
None. The UPS 120 is not an engine-driven generator - it is a stationary, battery-free flywheel energy-storage UPS module rated 120 kVA. It has no crankcase, fuel system, or cooling system of its own; a spinning flywheel and an IGBT-based converter bridge the outage window until a separately supplied standby generator set comes online.
What is the operating weight of the Caterpillar UPS 120?
Cat does not publish a standalone weight figure for the 120 kVA single-module cabinet in the factory literature available. The smallest documented sibling in the family, the 300 kVA single-module system, ships around 3,063 kg (6,750 lb); expect the 120 kVA cabinet to weigh less than that. Confirm the exact figure from the unit's data plate or your Cat dealer, since it varies by cabinet options.
What replaced the Caterpillar UPS 120?
Cat's current flywheel UPS catalog is built around the modular 300Z, 600Z, 900Z, and 1200Z Z-series, which parallels multiple 300 kVA modules for scalable capacity up to 1200 kVA per cabinet and higher in parallel installations. The fixed-rating single-module lineup that included the UPS 120 is now largely legacy stock; buyers needing smaller standalone capacity today are generally pointed toward the 300 kVA single-module system as the practical entry point.
What UPS 120 owners discuss
Does the UPS 120 have its own diesel engine, and is it really a generator set?
No engine is fitted. The UPS 120 is the smallest single-module rating in the Cat flywheel-based UPS line (120 kVA up through multi-MVA parallel systems). It stores energy in a spinning flywheel and bridges the load electrically during a utility outage until a separately supplied diesel generator set starts, synchronizes, and walks in to take over. Despite sharing Cat's generic Engine - Generator Set parts-catalog heading, this unit has no fuel system, crankcase, or alternator prime mover of its own. Confirm the exact configuration on your unit's nameplate before ordering parts.
What wears out on these units the way bearings and undercarriage wear on mobile equipment?
The flywheel rotor bearings are the main wear item. Older mechanical (ball) bearing designs need periodic lubrication and replacement every few years; later sealed or magnetically supported rotor designs run with little to no routine lubrication but still typically need bearing replacement on a roughly 5 to 8 year cycle. On vacuum-housed rotor designs, the vacuum pump that reduces windage drag on the spinning flywheel is a separate wear item, with an average service life in the 8 to 10 year range — check vacuum level and the oil sight gauge on schedule. None of these intervals are published specifically for the 120 kVA module; treat them as typical for the platform and confirm against the unit's own maintenance manual.
What electrical or sensor problems come up on flywheel UPS systems like this?
Fault reports on this class of unit center on the power-conversion electronics rather than a mechanical driveline: inverter/IGBT faults, IGBT driver-board faults, output short circuits, and control-board faults are the most commonly cited causes of an inverter-fault alarm. The static bypass switch, the solid-state switch that dumps the load straight to utility power if the UPS itself faults, is another common alarm source; a shorted switching device there is a frequent failure mode. Flywheel speed and vacuum-level sensors also throw their own alarm codes when out of range. Work through the operator-panel fault code first, then escalate any inverter or bypass-switch fault to a qualified UPS technician rather than attempting board-level repair. Have your dealer verify the fault before returning the unit to service.
How does the ride-through and generator hand-off actually behave in the field?
On the platform this module belongs to, the flywheel spins up to roughly 4,000 rpm before it is load-ready and continues to a full-charge speed near 7,700 rpm, with the complete start sequence taking under 5 minutes. During a utility loss the output voltage transient stays under about 3 percent at full load, and transfer to the flywheel is effectively instantaneous, well under one half-cycle. Generator walk-in time, how long the flywheel is asked to carry the load before the standby genset takes over, is field-programmable, commonly cited in the 1 to 15 second range, giving the generator time to start and synchronize. These figures are documented at the flywheel-UPS platform level; a rating confirmed specific to the 120 kVA module has not been published, so verify actual programmed values against site commissioning records.
Is a flywheel unit like this actually more reliable than a battery UPS?
Field and reliability studies on this style of flywheel UPS report meaningfully better availability than battery-based double-conversion UPS, largely because undetected battery failure is cited as the cause behind the large majority of double-conversion UPS failures. A flywheel design removes that failure mode and typically runs in the high-90s percent efficiency range. The tradeoff is a short ride-through window measured in seconds, not minutes, so the design only works if the standby generator reliably starts and synchronizes inside that window. The flywheel is a bridge to generator power, not a standalone backup source.
What should I check before buying a used Cat UPS 120?
Get the full maintenance history and the firmware/alarm log off the operator interface before anything else; this is power-electronics gear, not something you can judge by eyeballing wear. Check the age of the unit against the roughly 15 to 20 year typical service life for this class of flywheel UPS, and separately confirm the vacuum pump's age and oil sight-gauge condition against its own roughly 8 to 10 year service life. Confirm whether the rotor uses mechanical bearings, due for replacement every few years, or a sealed/magnetic design, roughly 5 to 8 years, and when it was last done. Have the unit powered up and load-tested by a qualified technician before purchase; a unit that looks fine sitting idle can still have a rotor, bearing, or vacuum system that is not safe to spin up without inspection. Have your dealer verify condition and the de-energize/lockout procedure before any hands-on inspection or test.
Any safety notes specific to working around this unit?
Treat the enclosure as stored mechanical energy, not just an electrical hazard. The flywheel rotor spins at several thousand rpm in normal operation and keeps coasting down for a period after shutdown, so panels and rotor housings should stay closed until the unit is confirmed fully spun down and de-energized per the OEM lockout/tagout procedure. Combine that with standard high-voltage precautions for the power-conversion cabinet. Have your dealer or a factory-trained technician verify the unit is fully de-energized and spun down before any internal inspection or component work.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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