DEIF DM-4 Marine&Offshore Ship Power Management System

Additional operation panel (AOP-1/AOP-2):

AOP-1: Standard main DGU with 0.5m cable, including 8 buttons and 16 LEDs.

AOP-2: Connected via CANbus, up to 200m away, each DU can connect up to 5 AOP-2.

AOP provides system status indication and power station mode control (such as semi-automatic, automatic, manual, shutdown, etc.).

DM-4 LAN communication network

The communication between internal DGUs adopts DM-4 LAN for system computation, load distribution, and coordinated control.

PCM 4-1 uses a single twisted pair network.

PCM 4-5 can choose dual redundant LAN (to be ordered) to improve fault tolerance.

Long distance applications can be extended through fiber optic converters.

External communication: Supports RS485 Modbus RTU, Modbus TCP/IP (via PCM 4-5 Ethernet), and CANopen (via CAN interface) for easy access to SCADA or alarm monitoring systems.

Power Management

All DGUs run the same software and recognize their respective roles through the Node Switch on PCM 4. x, achieving distributed management. Each DGU can independently perform specific functions, and this design allows modules to be interchangeable as spare parts, ensuring the continuous operation of critical units in emergency situations.

The power management function includes:

Load dependent start/stop: Automatically increase or decrease the operation of the unit based on the total system load.

Programmable startup priority: Start the unit in the preset order.

Load group control: managing the input and disconnection of heavy loads (such as thrusters).

Load Shedding: Automatically cut off secondary loads before overloading.

Control/monitoring of bus tie and shore power circuit breakers.

Symmetric or asymmetric active/reactive load distribution.

Speed controller controls frequency regulation and active power distribution; AVR control achieves voltage regulation and reactive power distribution.

Protection function (ANSI standard)

DM-4 provides comprehensive protection for generators, busbars, and shore power, all of which are time limited features. The following table lists the main protection functions (ANSI numbers in parentheses):

Protection function ANSI level

Speed monitoring device 15 1 step

Overexcitation 24 2 steps

Synchronization check 25 1 step

Generator undervoltage 27 1 step

Bus undervoltage 27B 2 steps

Generator overload 32 2 steps

Generator reverse power 32R in 2 steps

Demagnetization 40 2 steps

Current imbalance 46 1 step

Phase sequence voltage 47 1 step

Circuit breaker failure 50BF 1 step

Generator overcurrent 50 4 steps

Voltage dependent overcurrent 51V 1 curve

Generator overvoltage 59 2 steps

Bus overvoltage 59B 2 steps

Voltage imbalance 60 1 step

Locking (start/synchronization) 68 1 step

Generator over frequency/under frequency 81, 2 steps each

Bus over frequency/under frequency 81B 2 steps each

Electronic locking relay with 86 channels

Speed/Voltage/Frequency Control 90-

Trip relay 94-

Advanced generator protection (engine/governor/fuel failure) 95 optional

Advanced protection (optional): Through fast communication between PMS units and load distribution deviation calculation, faults such as diesel engine, governor or fuel filter blockage can be detected, and the faulty unit can be automatically disconnected before causing serious disturbance, avoiding power loss throughout the ship. Quick load shedding (optional): Based on load deviation calculation, send an immediate load shedding signal to thrusters and other equipment to prevent generator overload. Special protection functions can be customized as needed.

Customized functions and engineering processes

The flexible I/O platform and integrated electrical parameter measurement of DM-4 provide a foundation for developing customized functions, such as:

Advanced load shedding/offloading algorithm

Load allocation for fuel economy optimization

Propulsion interface and control

Custom operating mode

Order process: Due to the highly customized system, DEIF requires customers to directly contact and provide a single line diagram (including generator and circuit breaker) and control concept description. Based on this, the DEIF project engineer completes the engineering design and provides a quotation to ensure that the system perfectly matches the requirements.

8 Utility Software（USW）

Free PC tools (available for download from www.deif.com) support:

USB directly connected to PCM (or connected to PCM 4-5 via TCP/IP)

Software Download and Parameter Setting

Online monitoring of all DGU modules

Alarm monitoring and clock synchronization

Trending Record

Quick Deployment of Installation Wizard

Summary of Technical Specifications

DGU rack

Working temperature: -25~+70 ℃

Vibration level: DNV A+C (3~13.2Hz 2.0mmpp, 13.2~100Hz 0.7g; earthquake level 3~8.15Hz 15mmpp)

Protection level: IP20

Humidity: 97% RH (IEC 60068-2-30 Db)

Installation method: Base installation

EMC/CE: Complies with EN 61000-6-1/2/3/4

Material: UL94-V0 plastic, aluminum shell, steel panel

Weight: 3.2~8.3kg (depending on configuration)

PCM module

Power supply: 24V DC (-25%/+30%), maximum 6A

Battery voltage measurement accuracy: ± 0.8V (8-32V DC)

CAN: PCM 4-1 has 3 channels, PCM 4-5 has 2 channels (125~250 kbps)

RS485: PCM 4-5 Port 1 up to 38.4 kbps, Port 2 up to 115 kbps