DEIF Generator Protection Controller (GPC) / DU-2 MKIII for Marine Generator Systems

Manufacturer: DEIF A/S
Country of Origin: Denmark
Product Type: Generator Protection Controller / Marine Genset Controller
Marine Application: Generator protection, breaker control, synchronising, alarm monitoring, and power management in ship switchboards

---

Product Introduction

The equipment shown in your photos is a DEIF Generator Protection Controller (GPC) from the DEIF multi-line series, and the rear label indicates Type: DU-2/MKIII. This is a marine generator controller used in ship power systems for generator protection, breaker supervision, synchronising logic, and generator monitoring.

Onboard a vessel, this controller acts as one of the key devices in the generator control and protection system. It continuously monitors electrical values such as voltage, frequency, and operating status, while also helping manage generator breaker open/close status, protection alarms, and safe generator operation. DEIF’s multi-line GPC family is designed for generator protection and power-management duties in marine and industrial switchboards.

---

What Is This Equipment?

The DEIF GPC is a generator protection and control unit installed in the generator panel or main switchboard. In marine applications, it is typically used to:

• monitor generator voltage and frequency
• supervise generator breaker status
• provide generator protection alarms and shutdown logic
• support synchronising / load sharing / power management functions depending on system design
• display alarms, logs, and operating parameters to engineers

The front panel design in your photo clearly matches the DEIF multi-line Generator Protection Controller style, with display, navigation keys, status LEDs, and alarm indication. Similar DEIF GPC units are widely used on ship generator control panels and marine switchboards.

---

Main Features

1) Generator Protection

Protects the generator by monitoring abnormal electrical conditions such as:

• over/under voltage
• over/under frequency
• possible phase-related abnormalities depending on configuration
• breaker and generator status alarms

2) Breaker Supervision

The controller monitors open / closed breaker condition and helps control generator breaker operation in the switchboard.

3) Alarm & Event Handling

The front panel allows engineers to view:

• active alarms
• log / event information
• status pages and controller information

4) Multi-Line Marine Controller Design

The DEIF multi-line series is built for genset and marine power-management applications, making it suitable for engine-room switchboards and generator panels.

5) Communication & Service Interface

From the rear and terminal photos, the unit includes communication and service ports for integration with the vessel’s generator control / monitoring system.

---

Main Components

Based on the photos, this DEIF unit includes:

• front LCD display and keypad
• alarm / ready / power / self-check indicators
• rear communication ports and service connectors
• programmable relay / I/O terminals
• internal generator protection and breaker control electronics
• 24 VDC-powered control circuitry (as shown on the rear label)

The rear label shows DU-2/MKIII with 24V supply and programmable relay outputs, confirming that it is a configurable marine generator control/protection device.

---

Marine Applications

The DEIF GPC / DU-2 MKIII is commonly used in:

• main generator control panels
• auxiliary generator switchboards
• marine power management systems
• generator breaker control circuits
• synchronising and generator protection systems
• engine room electrical control panels

It is especially relevant on vessels where DEIF-based power management and generator protection equipment is installed.

---

Common Problems & Troubleshooting

1) Controller Dead / No Display

Possible causes: loss of 24V supply, blown fuse, terminal power issue, internal power fault.
Checks: verify supply voltage, terminal tightness, and panel fuse / DC feed.

2) Generator Breaker Not Opening / Closing Properly

Possible causes: output relay fault, external breaker circuit issue, wrong permissive signal, breaker feedback fault.
Checks: inspect breaker control wiring, close/open feedback, and relay outputs.

3) Alarm or Self-Check Fault

Possible causes: wrong input signal, internal controller issue, sensor / voltage feedback problem, configuration fault.
Checks: review alarm log, verify measured voltage/frequency inputs, compare with actual generator condition.

4) Communication / Monitoring Failure

Possible causes: cable fault, network configuration issue, communication port problem, controller internal fault.
Checks: inspect communication ports, wiring, and system network status.

5) Wrong Electrical Readings

Possible causes: bad PT/CT wiring, loose terminal, incorrect setup, damaged input section.
Checks: verify voltage/current input wiring and compare with switchboard meters.

---

Maintenance Tips

• keep terminals tight and clean
• protect the controller from moisture, heat, and vibration
• verify 24V control supply stability
• check breaker feedback and control wiring during maintenance
• keep backup settings / parameter records if available
• before replacement, confirm model, rear label, part number, and terminal wiring

For older DEIF power-management systems, keeping a tested spare controller can save significant downtime.

---

Why Ships Still Use This Equipment

Ships continue to use the DEIF GPC / DU-2 MKIII because it is a proven generator protection and breaker-control device that remains integrated into many existing switchboards. Replacing the full switchboard logic is expensive, so shipowners often prefer to repair or replace the controller while keeping the original power-management system in service.

---

Frequently Asked Questions (FAQ)

What is the DEIF GPC used for?

It is used for generator protection, breaker supervision, alarm handling, and generator control in marine switchboards.

Is DU-2 MKIII the same unit as the front GPC controller?

Your photos indicate a DEIF multi-line Generator Protection Controller, and the rear label shows DU-2/MKIII, which appears to be the exact rear type designation of this unit.

What happens if it fails?

The ship may lose generator protection functions, breaker control logic, alarm monitoring, or synchronising-related control depending on system design.

Can it be repaired?

In many cases, yes—depending on the fault, repairs may be possible for power supply, display, relay outputs, communication sections, or internal electronics.

What should be sent before ordering?

Please send:

• front and rear photos
• full rear label / type number
• fault description
• vessel generator panel application
• terminal wiring photo if possible

---

Short Product Description

The DEIF Generator Protection Controller (GPC) / DU-2 MKIII is a marine generator control and protection unit used in ship switchboards for generator monitoring, breaker supervision, alarm handling, and protection functions. It is a key spare part in DEIF-based marine power-management systems and remains widely relevant for ship generator panel maintenance and replacement support.

---

Important note: before ordering a replacement, match the following carefully:

• DEIF front model / GPC series
• rear type: DU-2/MKIII
• supply voltage
• relay output specification
• vessel switchboard application

---

SM MARINE SERVICE™

Marine Automation & Navigation Equipment Supplier

Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment

Stock Location:
• Bangladesh • China

Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing

Contact Information

SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com

 

-

+

Buy Now