DEIF PPM Power Management System Operation and Troubleshooting

Fault level: generally set to F4 (trip) to prevent the motor from reversing after the prime mover stops.

2. Overcurrent (1031-1094)

Provide two modes: fixed time limit (1-4 segments) and inverse time limit (6-segment line). Taking inverse time as an example, six current time points can be set (such as 110%/5s, 120%/3.8s, 140%/2.5s... 200%/0.5s) to simulate a typical inverse time curve. Suitable for coordination with upstream protection to achieve selectivity.

3. Generator over/under voltage, over/under frequency

Overvoltage section 1 is usually set to 105%~110% with a delay of 5 seconds; undervoltage section 1 is set to 90%~95% with a delay of 5 seconds.

Over frequency segment 1 is set to 105% with a delay of 5 seconds; under frequency segment 1 is set to 95% with a delay of 5 seconds.

The fault level is usually F3 (shutdown) to avoid equipment damage.

4. Heavy Consumer (8201~8213)

Two sets of overloads can be defined, each requiring setting of maximum power, load type (fixed/variable), and confirmation type (steady state/pulse). When the request signal (HC REQUESTED) is activated and the current available power is sufficient, PPM will issue the HC CONNECTED signal, allowing overload input. If the power is insufficient, the controller will prioritize starting the standby unit.

Typical Failure Modes and Emergency Response (FMEA Summary)

Chapter 6 of the operation manual provides a detailed Failure Mode and Effects Analysis (FMEA), covering the following high-frequency fault scenarios:

Possible causes of the fault phenomenon, local impact, system level impact, and handling suggestions

The CAN interface is lost, communication lines are loose, or the board is faulty. The unit has lost PMS control, and all units are switched to local control. Speed/voltage regulation only relies on drooping to check the CAN bus connection and terminal resistance, and restart the controller

Loss of power supply 24V DC fault or complete failure of power supply line protection, the unit is uncontrollable and unusable. Check the fuse and power module, and it is recommended to configure dual redundant power supply

Circuit breaker closing failure, coil fault or failure to receive closing command, unable to connect to the grid. PMS sends out "next start" signal to check the closing circuit and pulse width setting (2024 tCB)

Abnormal feedback of circuit breaker position, auxiliary contact disconnected or short circuit position unknown, logical disorder. The unit does not participate in load dependent start stop inspection for auxiliary contacts and wiring terminals of 5a/56a

Generator shutdown failure operation signal does not disappear, fuel valve or shutdown coil is stuck, resulting in shutdown failure alarm. Check the stop relay (terminal 122) and shutdown circuit

Synchronization failure, slip, pressure difference or phase angle exceeding the limit, unable to close and timeout alarm, can be transferred to the next machine to check the synchronization parameters (dynamic fMAX, Δ U, tCB)

For each type of fault, the manual specifies the remedial actions automatically taken by the system (such as starting the next unit, switching to local mode, etc.), and operators should conduct regular fault simulation exercises to familiarize themselves with the operating procedures.

Daily maintenance and software upgrade suggestions

Regularly download event logs and trend data: It is recommended to export them once a month and save them in CSV format using the "Logs" window of Utility Software for analyzing the trend of unit performance degradation.

Check the communication between AOP-2 and the display unit: If it is found that the AOP-2 LED does not match the actual state, check whether the CAN bus shielding layer grounding is single ended reliably and whether the terminal resistance of 120 Ω is in place.

Firmware upgrade: Use the "Flash/upload a firmware" function of Utility Software to perform the upgrade. Before upgrading, be sure to back up all parameters. If there is parameter confusion after upgrading, you can perform "upload" to restore the backup.

Password management: The factory password is 2000, and it is recommended to change it immediately (channels 9116, 9117, and 9118 correspond to customer, service, and administrator permissions, respectively). Once forgotten, please contact DEIF technical support (provide hardware serial number) to reset.