Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | DEIF PPU-2 |
| Manufacturer | DEIF |
| Product Type | Genset Protection and Control Unit |
| Primary Application | Generator protection, synchronization, and power management |
| Voltage Measurement | 100–690 VAC (max 480 VAC UL) |
| Current Input | 1 A or 5 A CT |
| Control Supply | 12/24 VDC |
| System Architecture | Distributed control with centralized alarm and management |
| Protection Functions | Configurable alarms, setpoints, timers, and relay outputs |
| Installation | Main unit in switchgear; display panel door-mounted via cable |
| Dimensions (Main Unit) | 263 × 58 × 28 mm |
| Weight | Approx. 4.3 kg |
| Status | Discontinued; superseded by DEIF PPU 300 |
| Condition | Surplus or Refurbished (Tested) |
| Warranty | 12 months |
Product Introduction
The DEIF PPU-2 is a genset protection and control unit designed for marine and industrial power systems. It monitors generator voltage and current, manages protection functions, and supports synchronization for parallel generator operation.This unit uses a split installation: the main module mounts inside the switchgear, while the display mounts on the panel door. It is now discontinued, and DEIF PPU 300 is the recommended replacement. DEIF has documented a 1:1 replacement path from PPU-2 to PPU 300, allowing existing switchgear wiring and alarm interfaces to be reused in many cases.
Installation & Configuration Guide
Preparation (10 min)
- Confirm the nameplate model, hardware revision, and serial number.
- Record existing alarm setpoints, timers, and relay assignments.
- Back up configuration data if the unit is still accessible.
- Verify CT ratio, VT ratio, and generator nameplate data.
- Prepare an ESD-safe work area.
Removal (5–10 min)
- Isolate control power before touching terminals.
- Label all CT, VT, control, and communication wires.
- Photograph the display cable routing and terminal positions.
- Remove the door display first, then disconnect the main unit.
- Do not open CT circuits while the generator is energized.
Installation (10 min)
- Mount the main unit inside the switchgear compartment.
- Mount the display on the panel door and reconnect the display cable.
- Reconnect CT, VT, and control wiring using the saved labels.
- Verify CT polarity and VT phase sequence.
- Confirm control supply is 12/24 VDC and within tolerance.
Power-On & Test (10 min)
- Apply control power and check display startup.
- Verify voltage and current readings against reference instruments.
- Confirm alarm outputs and relay assignments.
- Test protection setpoints under controlled conditions.
- Document final settings before returning the genset to service.
Troubleshooting Quick Reference
| Symptom | Likely Cause | First Check |
|---|---|---|
| No display | Control supply missing or fuse open | Measure 12/24 VDC at the control terminals |
| Incorrect voltage reading | VT ratio or wiring error | Compare VT ratio setting with nameplate |
| Incorrect current reading | CT ratio or polarity error | Verify CT ratio and secondary wiring |
| False alarm | Setpoint or timer mismatch | Compare settings with approved commissioning sheet |
| Display communication fault | Display cable loose or damaged | Inspect door cable and connector seating |
| Unit not recognized | Hardware option mismatch | Check installed hardware options against original build |
Dimensions, Mounting & Wiring Notes
- Main Unit Dimensions: 263 × 58 × 28 mm.
- Weight: Approx. 4.3 kg.
- Mounting: Main unit inside switchgear; display panel door-mounted.
- Display Connection: Dedicated display cable between main unit and door display.
- Voltage Input: 100–690 VAC; confirm UL limit of 480 VAC where applicable.
- Current Input: 1 A or 5 A CT; verify CT secondary rating before wiring.
- Control Supply: 12/24 VDC; verify polarity and fuse protection.
- ESD: Use a grounded wrist strap during handling.
FAQ
Is the DEIF PPU-2 still available as new original stock?
No. PPU-2 is discontinued. Remaining units are typically surplus or refurbished. For new installations, DEIF PPU 300 is the current replacement.Can PPU 300 replace PPU-2 without rewiring the panel?
DEIF has documented a 1:1 replacement path for PPU-2 to PPU 300 in marine switchgear upgrades. Existing switchgear wiring and alarm interfaces can often be reused, but the final scope must be confirmed against the site drawings.What voltage and current inputs does PPU-2 support?
It supports 100–690 VAC voltage measurement and 1 A or 5 A CT inputs. Control supply is 12/24 VDC.Is PPU-2 suitable for marine genset applications?
Yes. It has been used in marine power systems, including genset protection and synchronization. However, replacement planning should consider current class society requirements.I have a PPU-2 with missing settings. Can it still be used?
It can be reused if the hardware is functional and the configuration can be restored. Always verify protection setpoints against the approved commissioning record before energizing.Do you provide a test report for refurbished units?
Refurbished units can be tested under controlled conditions. Function is verified under test conditions, but site acceptance depends on the actual switchgear configuration and protection settings.
