Complete Guide to DEIF GPU-3 Generator Protection Unit

Engine interface power supply (terminal 98/99): independent power supply, maximum 5W, isolated from the main power supply.

6.3 Environment and Machinery

Working temperature: -25~70 ℃ (-25~60 ℃ with N option included, UL limit 55 ℃).

Storage temperature: -40~70 ℃.

Altitude: 0-4000m, derating is required for distances above 2000m (voltage ≤ 480V for 3W4 wiring, ≤ 690V for 3W3).

Vibration and Shock: Meets IEC 60068-2-6 and IACS UR E10, capable of withstanding 30g/11ms shock (durability).

Protection level: IP20 for the host and IP40 for the display unit (up to IP54 with added sealing gasket, meeting marine requirements).

6.4 Input/Output Characteristics

Digital input: Bidirectional optocoupler, conduction threshold 8-36V DC, turn off<2V, typical impedance 4.7k Ω.

Relay output: 250V AC/30V DC, 5A (resistive), capable of continuous 2A or short-term 4A (5s/15s duty cycle).

Analog output (optional): 0-20mA or ± 20mA, active output (internal power supply), maximum load of 500 Ω, update rate of 250ms (transmission) or 100ms (regulation).

Multi functional input (slot # 7): can connect Pt100/Pt1000, 0-20mA, RMI (0-1700 Ω), 0-40V DC, with an accuracy of ± 1%, and has the ability to detect wire breakage.

Selection and configuration examples

DEIF divides GPUs into three basic models (variants):

01: With display unit, standard delivery (including 3-meter cable).

02: No display unit (suitable for integration into existing display systems).

03: Equipped with display unit and option F1 (2-channel analog transmission output).

On this basis, users can add the desired options, such as:

Synchronization function required → Add G2

Need engine control → add M4 (hardware board) and Y1/Y7 (display layout)

Modbus communication required → add H2

High precision measurement at level 0.5 is required → add Q1

IP54 protection is required → add L (indicating sealing gasket)

Selection example (from manual):

2912110030-03 GPU-3 Marine03 M4 Y1 H2

Indicating display, F1 output, engine control board, engine+circuit breaker display layout, Modbus RTU communication.

Debugging, Configuration, and Maintenance Tips

PC Tool: DEIF provides Multi line 2 PC Utility software (USB connection) for free, which can monitor all measurement values online, modify parameters, update firmware, and customize logic using M-Logic editor.

Parameter download and backup: It is recommended to upload and save the complete parameter file before debugging for quick recovery in case of failure.

Synchronization parameter setting: If synchronization is enabled, it is necessary to carefully set the pressure difference, frequency difference, closing lead angle, etc. to avoid impact.

Broken wire monitoring resistor: When the digital input enables broken wire monitoring, the external contacts must be connected in parallel with a 270 Ω± 10% resistor, otherwise the system will report a "broken wire" fault.

Shielding and grounding: Communication lines, MPU lines, and analog signal lines should use shielded twisted pair cables, with the shielding layer grounded at one end, and the terminal resistance (such as 120 Ω for CAN) connected as needed.

Regular self check: GPU -3 power on self check, and relay/output testing can also be manually triggered through the menu during operation to ensure circuit integrity.