An alarm about the PIU board

Dear friend!

0x55 indicates that the first input voltage of the APIU is abnormal.

1. Check whether the first power supply of the device is disconnected. If yes, connect the first power supply. If you really don't plan to do it, please mask the alarm.

2. check whether the first switch of the DC PDU in the cabinet is ON. If not, set the switch to ON. 

3. After the switch or cable cause is excluded, use a multimeter to check whether the external input power supply voltage is within the normal range. For details, refer to the working voltage range of the power supply board that reports the alarm. If the voltage is beyond the normal range, check whether the power supply of the equipment room is faulty.

4. As to the PIU board, if the external input power supply voltage is normal, but the alarm persists, the DC PDU switch may be faulty. Replace the DC PDU switch.

5. After the above causes are excluded if the alarm persists, replace the faulty power supply board.

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POWER_FAIL

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Thanks!