1903

Module overtemp.

Major

The temperature of the PID module is excessively high.

The PID module does not work and generates no output.

1. Check the PID module installation environment and verify whether the heat dissipation meets requirements. If no, relocate the PID module.
2. If the alarm is generated frequently, contact Huawei technical support.

1914

Output overcur.

Major

The load current exceeds the alarm threshold.

The PID module does not work and generates no output. The fault can be automatically rectified.

1. Check whether a short circuit exists between both of the PV module and three-phase power grid and the ground. If yes, eliminate the short circuit.
2. If the alarm is generated frequently, contact Huawei technical support.

1917

Grid volt. imbal.

Major

The three phases of the power grid differ greatly in voltage.

The PID module does not work and generates no output. The fault can be automatically rectified.

1. Check whether the power grid is abnormal. If yes, rectify the fault.
2. If the alarm is generated frequently, contact Huawei technical support.

1918

Grid overvolt.

Major

The power grid line voltage exceeds the upper threshold.

The PID module does not work and generates no output. The fault can be automatically rectified.

1. Check whether the power grid is abnormal. If yes, rectify the fault.
2. If the alarm is generated frequently, contact Huawei technical support.

1919

Grid undervolt.

Major

The power grid line voltage is lower than the lower threshold.

The PID module does not work and generates no output. The fault can be automatically rectified.

1. Check whether the power grid is abnormal. If yes, rectify the fault.
2. If the alarm is generated frequently, contact Huawei technical support.

1920

Incorrect PV mode

Major

In commissioning or normal mode, running parameter settings are incorrect.

The PID module does not work and generates no output.

1. Check whether the Working mode of the PID module is Normal. If not, set the working mode of the PID module to Normal.
2. For details, see System Commissioning.

1921

Incorrect wiring

Major

1. The functional earthing cable is not or loosely connected.
2. The PE cable is not or loosely connected.

The PID module does not work and generates no output. The PID module should be restarted to clear the alarm.

1. Check the input power cable, functional earthing cable, and PE cable for the PID module. If any cable is not properly connected, reconnect it securely.
2. If the alarm is generated frequently, contact Huawei technical support.

1924

Grid Loss

Major

The power grid is power off.

The PID module does not work.

1. Check whether the power grid is abnormal. If yes, rectify the fault.
2. If the alarm is generated frequently, contact Huawei technical support.

1925

Grid overfreq.

Major

The power grid frequency exceeds the upper threshold of the PID module working frequency.

The PID module does not work.

1. Check whether the power grid is abnormal. If yes, rectify the fault.
2. If the alarm is generated frequently, contact Huawei technical support.

1926

Grid underfreq.

Major

The power grid frequency is lower than the lower threshold of the PID module working frequency.

The PID module does not work.

1. Check whether the power grid is abnormal. If yes, rectify the fault.
2. If the alarm is generated frequently, contact Huawei technical support.

1930

Device fault

Major

The PID module is faulty.

The PID module does not work and generates no output.

1. Reason ID = 9
   1. Check whether the baud rate setting on the SmartLogger is the same as that on the PID module. If no, modify the baud rates to the same value.
   2. Check whether the RS485 cable is properly connected. If no, reconnect the cable securely.
2. Other cause IDs

   Restart the PID module.

3. If the alarm is generated frequently, contact Huawei technical support.

1931

Abnormal AC-to-ground resistance

Major

The system AC-to-ground resistance is lower than the threshold.

The PID module does not work.

1. Check the resistance between the AC power cable and the ground. If the resistance is abnormal, reconnect and secure the cable.
2. Check the ground resistance of each inverter in the system and calculate the resistance in parallel. If the result is below the detection threshold, change the threshold.
3. If the alarm is generated frequently, contact Huawei technical support.