In terms of performance ratings, the unit is marked with a power rating of 115/200V AC, 60kVA, and is also rated for 28.5VDC 1000A–2000A Peak.

The overall physical weight is listed as 2100 KG.

The GPU-4060 series is powered by a diesel engine, typically the Cummins QSB4.5 engine, which is turbocharged, in-line, and utilizes four cylinders. All engines used are fully-electronic diesel engines equipped with electronic governors to ensure precise frequency regulation. The engine’s governed speed is 2000 RPM to achieve the necessary 400 Hz output.

Finally, the condition (refurbished)

The equipment you have presented is a TLD Ground Power Unit (GPU). here are the technical details:

Specific Unit Identification (from Nameplate)

The specific unit identified by the nameplate has the following technical characteristics:

• Model: GPU-4080-T-CUP-98.
• Serial No.: T27918.
• Date of Manufacture: 2012.07.
• Weight: 2100 KG.
• AC Rating: 115/200V AC, 80KVA.
• DC Rating: 28.5VDC 1000A – 2000A PEAK.

General Technical Specifications (GPU-4060 Series)

The GPU-4060 is a self-contained, diesel engine-driven unit designed to supply regulated 400 Hz electrical power to parked aircraft.

1. Engine Details (Cummins Configuration)

The GPU uses a fully electronic diesel engine system, typically configured with a Cummins engine.

• Manufacturer/Model: Cummins QSB4.5.
• Type: Turbocharged, in-line, 4 Cylinder 4-cycle diesel.
• Governed Speed: 2000 RPM.
• Gross Rated Horsepower: 130 HP / 97 KW at governed speed.
• Electrical System: 24 Volt, negative ground.
• Emissions: Certified to meet EPA Tier 3 and Euro COM 3 regulations.
• Protection: Engine protection devices—including low oil pressure, high coolant temperature, and over speed protection—are programmed into the Electronic Control Module (ECM).
• Cool Down: The unit features an automatic engine cool down that ensures the engine runs at idle for approximately one minute prior to shutdown to protect the turbocharger from rapid temperature changes.

2. Generator System and Ratings

The generator is a brush-less, revolving field, three-phase, synchronous, alternating current generator.

3. Generator Control Module (GCM) Performance

The GCM functions as the “brain” of the GPU, providing voltage regulation and generator fault protection.

• Voltage Regulation: +/- 1% maximum over the full range of generator loading.
• Voltage Transient Recovery Time: The unit recovers to +/- 1% of nominal voltage within 100 milliseconds.
• Frequency Regulation: +/- 0.1% from no-load to full-load.
• Line Drop Compensation: Provides a voltage increase of 10 volts (line to neutral) to offset voltage drop in the aircraft cable assembly.
• Harmonic Content: Total harmonic distortion is not to exceed 2%.

4. Generator Protective System Trip Settings

The GCM is programmed to initiate generator output fault protection based on the following limits:

• Over frequency: Trips at 420 Hz in 5 seconds (resets at 417 Hz).
• Under frequency: Trips at 380 Hz in 7 seconds (resets at 383 Hz).
• Over voltage: Trips at 130 volts in 2 seconds (resets at 125 Volts).
• Under voltage: Trips at 100 volts in 7 seconds (resets at 110 Volts).

5. Construction and Physical Characteristics

The chassis is built of rugged galvanized steel, featuring rubber torsion axle mounting and fifth-wheel steering.

• Weight (Specific Unit): 2100 KG.
• Dimensions (GPU-4060): 
  • Length (towbar up): 92.36” (2346 mm).
  • Width: 57.09” (1450 mm).
  • Height (W/O beacon): 59.05” (1500 mm).