DEIF GPU-3 Marine Generator Protection Unit

Name: DEIF GPU-3 Marine Generator Protection Unit
Brand: DEIF
SKU: GPU-3

A marine generator protection unit

The DEIF GPU-3 is a compact microprocessor-based Generator Protection Unit for a synchronous or asynchronous generator, supplied in this data sheet as the GPU-3 Marine. It contains the galvanically separated 3-phase measuring circuits and is intended for land and marine applications; DEIF states it is marine-approved by all major classification societies and UL/cUL Listed. It suits PLC-controlled systems, with interfacing through digital and analogue I/O or serial communication.

Technical specifications

Parameter	Specification
Manufacturer / series	DEIF A/S, Multi-line 2, GPU-3 (SW 3.06.x or later)
Variants	01 with display 2912110030-01; 02 without display 2912110030-02; 03 with display plus F1 2912110030-03
Measuring voltage	100 to 690 V AC +/-20 percent; UL/cUL Listed 600 V AC; max 0.25 VA per phase
Measuring current	1 A or 5 A AC; max 0.3 VA per phase; 4 x In continuous, 20 x In for 10 s, 80 x In for 1 s
Frequency	30 to 70 Hz
Auxiliary supply	12/24 V DC nominal (8 to 36 V DC), terminals 1-2 max 11 W and 98-99 max 5 W; 2 A slow-blow fuse
Accuracy	Class 1.0 to IEC/EN 60688
Relay outputs	250 V AC / 30 V DC, 5 A (UL/cUL 250 V AC / 24 V DC, 2 A resistive)
Analogue outputs	0(4) to 20 mA and +/-25 mA, galvanically separated, load max 500 ohm
Mounting	DIN rail or base mount with six screws
Protection degree	Unit IP20; display IP40, IP54 with gasket (option L); IP54 display required for RS-approved applications
Operating temperature	-25 to 70 °C (-25 to 60 °C with option N); altitude to 4000 m
Weight	Base unit 1.6 kg; display 0.4 kg
Approvals	Marine-approved by major classification societies; UL/cUL Listed to UL508; UL/cUL Recognized to UL2200
Document	Data sheet 4921240352K (EN), 17 pages

Standard protections

The standard protection set includes generator reverse power (2 steps), over-current (6 steps), voltage-dependent and inverse-time over-current, over and under voltage and frequency, overload (5 steps), current and voltage unbalance, over-excitation and loss of excitation, plus busbar over and under voltage and frequency and busbar voltage unbalance. Response times with delay at minimum are under 50 ms for busbar voltage and frequency, under 200 ms for reverse power and over-current, and under 40 ms for fast over-current.

Options and ordering

Options include A mains protection, C add-on generator protection, D1 voltage control and G2 synchronisation, E and F analogue transducer outputs, H serial communication (Modbus, Profibus, MTU, CAN J1939 engine interfaces), M4 engine control and protection, N Ethernet and Y display layouts such as engine and breaker control. Not all options fit one unit; the hardware overview in the sheet shows slot allocation. The sheet’s worked example is item 2912110030-03 GPU-3 Marine 03 with M4, Y1 and H2. For gas engines see the GPU-3 Gas page.

Accessories listed for the GPU-3 are the standard display unit DU-2 (2912210050), an additional DU-2 on CAN bus (2912890030, two per unit), the AOP-1 operator panel (2912890040) and AOP-2 panel (2912890050, up to five per unit), the IP54 display gasket (1134510010) and display cables of 1 m (1022040064), 3 m (1022040076) and 6 m (1022040057). A USB cable (1022040065) connects the PC utility, and a crossed Ethernet cable (1022040055) serves option N. On start-up the unit runs a cyclical self-test and reports faults in clear text and on a status relay. The separate display can be fitted on the unit or on the switchboard door, and up to two further displays can be installed within 200 m.

How the DEIF GPU-3 works

The unit reads the three-phase voltage and current of the generator through galvanically separated circuits. It compares them with the set limits. When a value goes out of range for longer than its delay, the unit trips a relay, which opens the breaker or stops the set.

Where the GPU-3 is used

Ship generators
Land generator sets
PLC-controlled power systems
Synchronous generators
Asynchronous generators

Selection checklist for the GPU-3

Variant 01, 02 or 03
Display needed or not
Measuring voltage
Current input of 1 A or 5 A
Supply of 12 or 24 V DC
Relay and analogue outputs
Display enclosure class
Operating temperature

Installation, commissioning and maintenance notes for the GPU-3

Fix the unit on a DIN rail or on a base with six screws. Wire the voltage and current inputs with correct polarity. Connect the supply with a 2 A slow-blow fuse. Set the protection limits and the delays, then test the relays. Check the settings after any change to the plant.

Requesting a quotation for the DEIF GPU-3

Please send the variant, the generator data and the display option. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

GPU-3 variants

Variant 01 has a display, variant 02 has no display and variant 03 has a display plus option F1.

GPU-3 measuring voltage

The measuring voltage is 100 to 690 V AC and the frequency is 30 to 70 Hz.

GPU-3 measuring current

The current input is 1 A or 5 A AC.

GPU-3 auxiliary supply

The supply is 12/24 V DC, within 8 to 36 V DC.

GPU-3 accuracy

The accuracy is Class 1.0 to IEC/EN 60688.

GPU-3 relay outputs

The relays switch 250 V AC at 5 A.

GPU-3 analogue outputs

The analogue outputs are 0(4) to 20 mA and plus or minus 25 mA.

GPU-3 reverse power protection

The reverse power protection has two steps.

GPU-3 over-current protection

The over-current protection has six steps.

GPU-3 mounting and weight

The base unit weighs 1.6 kg and the display weighs 0.4 kg.

Protection records for the GPU-3

Record the software version, the limits and the delay of each protection step.

Choosing the right GPU-3 variant

Choose the version with a display when settings are changed on site.

Documents and quotation

This page carries the DEIF GPU-3 data sheet 4921240352K (EN). To quote, we need the variant, option set, quantity and the application it is destined for. See Diesel Generator Spare Parts for related DEIF controllers and generator control products.

DEIF genset and power management controllers

DEIF describes itself as a supplier of power control solutions for decentralised power generation on land and at sea. Its genset controllers range from the compact SGC and CGC units to the AGC 150 and AGC-4 Mk II controllers, which add synchronisation and power management for plants with many gensets. DEIF data sheets state the supply range, I/O, protections and approvals of each controller.

Frequently Asked Questions