DEIF PPU-3 Parallel and Protection Unit

DEIF PPU-3 Parallel and Protection Unit

Product basic positioning and core applications

PPU-3 is a compact microprocessor control unit launched by DEIF, which integrates the protection and control functions of synchronous/asynchronous generators in an "integrated" design. It has a built-in galvanized separated three-phase measurement circuit and is designed for ship application scenarios. It supports two core working modes (which can be combined):

Stand alone operation: independent power supply control for a single generator;

Parallel with other generators: Multiple generators are synchronized in parallel to achieve load distribution and coordinated control.

Its core value lies in simplifying the generator control chain, which can be connected to the PLC control system through digital/analog I/O or serial communication, and has flexible functional expansion capabilities.

Core functional modules

（1） Display and operation unit

Display configuration: The display unit (DU-2) is independently designed and can be directly installed on the host or at the front end of the distribution cabinet door (with a standard 3m display cable). A single PPU-3 can expand up to 2 additional display units (up to 200m away);

Display content: Real time display of all measured values, calculated values, alarm information, and event logs;

Extended operation panel: Optional AOP-1 (16 configurable LEDs+8 configurable buttons) or AOP-2 (16 configurable LEDs+8 configurable buttons+1 status relay), supporting CAN bus communication.

（2） Regulation Modes

According to the control object (governor/automatic voltage regulator), provide multiple types of switchable standard regulation modes to meet different operational requirements:

Specific functions of control object adjustment mode

Governor maintains a fixed frequency to maintain stable generator output frequency

Fixed power (base load) setting for fixed active power output

Frequency droop automatically adjusts the frequency as the load changes, adapting to parallel load distribution

Load sharing: Balanced allocation of active loads when multiple machines are connected in parallel

Automatic voltage regulator (AVR, optional option D1) with fixed voltage to maintain stable generator output voltage

Fixed reactive power setting for fixed reactive power output

Fixed power factor maintains power factor stability

Reactive load sharing: Balanced allocation of reactive load when multiple machines are connected in parallel

Voltage droop automatically adjusts voltage with changes in reactive load, suitable for parallel scenarios

（3） Self checking and configuration tools

Self test: Perform periodic self tests at startup, display fault information in plain text on the screen, and trigger alarms through relay outputs (status outputs);

M-Logic (Micro PLC): Free integration into PC tool software, supports custom input/output functions and logic conditions, and adapts to personalized application scenarios;

Configuration method:

Local: configured through the password protection menu of the display unit;

Remote: Connect to a PC via USB and use the free Windows version PC tool software (available from the DEIF download center), which supports parameter monitoring, configuration saving/downloading, and firmware updates.

（4） Engine control and protection (optional function)

After installing the engine control and protection module, the PPU-3 can achieve:

Engine start stop sequence control;

Engine protection function: Provides a complete backup of the engine shutdown channel in case of main processor failure, ensuring equipment safety.

（5） CANshare function (optional G9 option)

CANshare provides:

Digital load distribution and line fault (disconnection, short circuit) monitoring;

Support position feedback and monitoring of up to 4 bus circuit breakers (BTBs);

Manage up to 5 load distribution segments;

Monitoring of active/reactive load distribution;

Dead bus closing and first startup discrimination;

Simulation testing mode before debugging.

Standard protection functions (Protections)

PPU-3 is equipped with multiple protection functions that comply with IEEE Std. C37.2-1996 (R2001) standards, covering core fault scenarios of generators and busbars. Some functions support multiple threshold settings:

Protection Function ANSI Number Threshold Order Core Function

Generator reverse power (32) 2nd order to prevent the generator from absorbing grid power (such as when the turbine loses steam)

Generator over current (50/51) 6th order protection of the generator from overload current damage

Voltage dependent overcurrent (51V) 1st order combined with voltage state to determine overcurrent and avoid false triggering

Inverse time over current (51) The larger the first-order current, the shorter the action time, making it suitable for different overload scenarios

Generator over/under voltage (59)/(27) 2nd/3rd order protection for generator insulation and load from overvoltage/undervoltage impact

Generator over/under frequency (81) 3rd/3rd order to prevent frequency deviation caused by abnormal generator speed

Busbar over/undervoltage (59)/(27) 3rd/4th order protection for busbars and downstream loads from overvoltage/undervoltage damage

Busbar over/under frequency (81) 3rd/4th order to maintain bus frequency stability

Busbar voltage imbalance (60) 1st order prevention of equipment failure caused by three-phase voltage imbalance

Generator overload (32) 5th order to avoid long-term operation of the generator beyond rated load

Current/Voltage Imbalance (60) 1st order protection for generators and loads from damage caused by unbalanced current/voltage

Overexcitation/Loss of excitation (40/32 RV) 1st order protection generator excitation system to avoid magnetic field anomalies

Hardware and interface specifications

（1） Hardware architecture and slot allocation

The PPU-3 adopts a "slot based" hardware design, with fixed slots corresponding to different functional modules. Each slot only supports one hardware option, and the core slot functions are as follows:

Slot Number Function Category Standard Configuration/Optional Options Core Interface and Parameters

1. Power supply and basic I/O standard 8-36V DC power supply (11W); 1 status output relay; 5 relay outputs; 2 pulse outputs (kWh, kvarh); 5 digit inputs

Communication options include H2 (Modbus RTU/ASCII, RS-485), H3 (Profibus DP), etc., which are responsible for serial communication with external systems such as PLCs

3 load distribution standards with 13 numerical inputs; 4 relay outputs; 1 P (active) load distribution line; 1 Q (reactive power) load distribution line; 2 external set point inputs (GOV/AVR)

4 GOV/AVR/transmitter output standards (4 relay outputs); Optional E1 (2-channel+/-25mA), E2 (2-channel 0 (4) -20mA) and other output control signals can be sent to the speed regulator/AVR, or used as transmitter signal output

5 AC measurement standards, 3 generator voltage inputs; 3-channel generator current input; 3-channel bus/grid voltage input

6 Analog Output Expansion Optional F1 (2-channel 0 (4) -20mA transmitter output) to expand analog output channels

7 engine control and I/O expansion options include M4 (engine control, digital/analog I/O) and H7 (software level engine communication) to achieve engine start stop control, I/O expansion, and specific engine protocol docking

8. Advanced communication and load distribution options include G9 (CANshare), H5 (specific engine protocols such as Caterpillar, MTU), digital load distribution, and engine specific communication protocol docking

9 Ethernet communication options include N (Ethernet TCP/IP, supporting Modbus TCP/IP, EtherNet/IP, SMS/email alarms) to achieve remote monitoring and alarm notification over Ethernet

（2） Key technical parameters

Parameter category specific specifications

Working environment temperature: -25~70 ° C (-25~60 ° C with N option; UL/cUL certified environment maximum 55 ° C); Humidity: 97% RH (IEC 60068-2-30); Altitude: 0-4000m (downgraded for use from 2001 to 4000m)

Measurement range voltage: 100~690V AC (± 20%, UL/cUL certified maximum 600V AC); Current: 1/5A AC (from CT); Frequency: 30~70Hz

Auxiliary power terminal 1-2:12/24V DC nominal (8-36V DC operation, maximum 11W); Terminal 98-99:12/24V DC nominal (8-36V DC operation, maximum 5W); 2A slow melting fuse protection is required

Input/output digital input: optocoupler isolation, 8-36V DC conduction (impedance 4.7k Ω); Analog input: 0 (4) -20mA (impedance 50 Ω) RPM（MPU：2-70V AC，10-10000Hz）； Relay output: 250V AC/30V DC (5A, UL/cUL certified 2A resistive load); Analog output: 0 (4) -20mA/± 25mA (isolated, maximum load 500 Ω)

Electrically isolated AC voltage from other I/O: 3250V AC (50Hz, 1min); AC current and other I/O: 2200V AC (50Hz, 1min); Analog output and other I/O: 550V AC (50Hz, 1min)

Protection level host: IP20; Display unit: IP40 (optional L gasket can be upgraded to IP54, required for RS certification applications)

Certified ship certification: certified by all mainstream classification societies; Safety certification: EN 61010-1, UL 508, CSA 22.2 No.14-05; EMC certification: EN 61000-6-2/4, IEC 60255-26

Optional Features and Accessories

（1） Core optional options (some key options)

Specific description of option code function category

A-series power grid protection package A1 (limited time undervoltage 27t, undervoltage+low reactive power 27Q, etc.), A5 (directional overcurrent 67)

C2 Generator Extended Protection Package Negative Sequence Voltage High 47, Negative Sequence Current High 46, Zero Sequence Voltage High 59, etc

D1 Voltage Control Fixed Voltage, Fixed Reactive Power, Fixed Power Factor, Reactive Load Distribution, Voltage Drop

G9 CANshare digital load distribution+line monitoring, multi BTB monitoring, dead bus closing

H2/H3 serial communication H2 (Modbus RTU/ASCII, RS-485), H3 (Profibus DP)

N Ethernet Modbus TCP/IP, EtherNet/IP, SMS/email alerts

Y1/Y11 display and control Y1 (engine and GB control), Y11 (display unit without local control button)

（2） Standard and optional accessories

Accessory type, specific product usage, model/remarks

Display Unit DU-2 (Standard): The host is equipped with Display 2912210050, and the display layout needs to be specified

DU-2 (extension) additional extension display 2912890030, supports CAN bus

AOP-1 expansion operation buttons and LED 2912890040 on the operation panel, with a maximum of one unit per display

AOP-2 expansion panel with status relay 2912890050, up to 5 units per PPU-3

Cable display cable (3m/6m/1m) connects the display unit to the host 1022040076 (3m), 1022040057 (6m), etc

USB cable (3m) PC configuration connection 1022040065

Cross Ethernet cable (3m) N option Ethernet connection 1022040055

IP54 display gasket (L) enhances the protection level of the display unit 1134510010, required for RS certification

Ordering and Disclaimer

（1） Order specifications

Required information: model (such as PPU-3 Marine), variant number (such as 01 with display/07 without display), product number (such as 2912210030-01);

Optional information: Please specify the selected functional options (such as M4, Y1, H2) and accessories (such as AOP-2, IP54 gasket);

Example: Product number 2912210030-01 (PPU-3 Marine 01 with display)+option M4 (engine control)+Y1 (engine and GB control)+H2 (Modbus RTU).

（2） Disclaimer

DEIF reserves the right to modify document content without prior notice;

The English version of the document is the latest authoritative version, and there may be delays in the translated version. In case of any conflicts, the English version shall prevail;

DEIF is not responsible for the accuracy of the translated version.