Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | PPU-2 |
| Manufacturer | DEIF (Danish Electro-Industri Fonden) |
| Product Type | Power Plant Utility Controller |
| Primary Function | Generator Synchronization & Load Sharing |
| Operating Voltage | 110V AC |
| System Compatibility | DEIF Marine & Power Generation Systems |
| Control Logic | Programmable via DEIF configuration software |
| Mounting Style | Panel Mount / Rack Mount |
| Operating Temp | Marine/Industrial Grade |
| Protection Class | Conformal coated PCB |
| Communication | Proprietary DEIF Bus / Serial |
| Status | Discontinued (Legacy Platform) |
Product Introduction
The DEIF PPU-2 is a legacy power management controller designed for marine and stationary power generation applications. It serves as the central brain for generator sets, executing critical functions such as automatic synchronization, active/reactive load sharing, and auto-mains failure (AMF) logic. This module ensures that multiple generators operate in parallel safely and distribute electrical loads proportionally without manual intervention.Unlike modern digital controllers, the DEIF PPU-2 relies on older generation processing architecture, which is why DEIF has officially announced its end-of-life status. While it historically provided reliable service for vessel power plants and industrial backup systems, maintaining aging PPU-2 hardware carries increasing risks of component failure and lack of spare parts. For facilities still running this platform, securing tested replacement units is vital, but planning a migration to the PPU 300 is the definitive long-term solution.
Installation & Configuration Guide
Preparation (15 min)
Because the PPU-2 is discontinued, verify the exact hardware revision and parameter settings of the failing unit before removal. Gather insulated tools and an ESD wrist strap. Self-correction: Do not assume the new/refurbished unit has default parameters. You must have the original DEIF configuration file or a printed parameter log ready for transfer.Removal (5–10 min)
Isolate the generator control panel and lock out all AC/DC power sources. Disconnect the multi-pin wiring harnesses and communication cables (label each connector meticulously). Release the panel mounting screws. Pull the module straight out. Inspect the rear connectors for signs of overheating or pin corrosion, which is common in marine environments.Installation (10 min)
Align the replacement DEIF PPU-2 with the panel cutout or DIN rail. Secure the mounting hardware evenly to prevent PCB stress. Reconnect the wiring harnesses, ensuring locking tabs engage fully. Verify that the 110V AC control power wiring matches the terminal diagram exactly, as reversed polarity or incorrect voltage can instantly damage the internal power supply.Power-On & Test (15 min)
Restore control power. Observe the front panel display and status LEDs. Upload the saved configuration parameters using the DEIF service tool. Perform a no-load synchronization test with the bus bar. Verify voltage and frequency matching. Conduct a simulated load-share test to confirm the module communicates correctly with other paralleled generators before returning to automatic operation.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Immediate Action |
|---|---|---|
| Blank Display | Internal power supply failure | Measure 110V AC at input terminals. Replace if input is good. |
| Sync Fail Alarm | Voltage/Freq mismatch or phase rotation | Check PT/CT wiring. Verify bus and gen voltage. |
| Load Share Error | Communication loss between units | Check DEIF bus cabling and termination resistors. |
| Erratic Actuator Output | Feedback signal noise or PID tuning | Measure actuator feedback. Re-tune PID parameters. |
| AMF Fail to Start | Logic interlock or starter relay fault | Check safety chain inputs and DC start supply. |
Dimensions, Mounting & Wiring Notes
- Dimensions: Standard 1/2 DIN or custom panel cutout (Verify specific variant dimensions)
- Mounting: Front panel cutout with rear retaining clips or DIN rail
- Terminal Notes: Heavy-duty multi-pin connectors. Real-world detail: The PPU-2 often uses specific DEIF proprietary connectors that become brittle with age. If the locking mechanism on the harness feels cracked or loose, replace the connector shell during the swap to prevent future vibration-induced disconnects.
FAQ
Is the DEIF PPU-2 still available as a new original part?
No. DEIF has officially discontinued the PPU-2 platform. We supply professionally refurbished and tested units, but inventory is strictly limited. You should begin planning for an upgrade to the PPU 300.Can I upgrade directly from PPU-2 to PPU 300?
Yes. DEIF engineered the PPU 300 specifically as a 1:1 replacement for the PPU-2. Existing switchboards, alarm interfaces, and wiring can typically be reused, making the upgrade straightforward during a scheduled dry-dock or maintenance window.I have a PPU-2 that failed. Can I just buy another used one?
You can, but it is a short-term fix. Used PPU-2 units are aging assets. If your system has multiple PPU-2 controllers, replacing them one-by-one with used parts is risky. We strongly recommend using this failure as the trigger to upgrade the entire panel to PPU 300.What configuration data do I need before replacing a PPU-2?
You need the complete parameter set (generator ratings, PID settings, protection thresholds) and the synchronization logic configuration. If you do not have a backup file, a DEIF service technician may need to extract it from the failing unit before it becomes completely unresponsive.Does the PPU 300 require reprogramming?
The PPU 300 is designed for 1:1 hardware replacement, but it uses newer firmware. DEIF project engineers typically handle the parameter migration and commissioning to ensure a seamless transition without modifying your existing switchboard wiring.How do I verify the 110V AC supply is safe for the replacement unit?
Measure the AC control voltage at the panel terminal block with a true-RMS multimeter. Ensure it is within the ±10% tolerance (99V–121V AC). Voltage spikes are a common cause of premature controller failure in marine power plants.I’m seeing synchronization issues. Is the PPU-2 failing?
It could be, but rule out external factors first. Check the potential transformer (PT) and current transformer (CT) wiring, verify breaker auxiliary contacts, and ensure the generator’s magnetic pickup sensor is clean and properly gapped. Controller failures are less common than sensor/wiring issues.
