ALM-5996 DC Over Voltage Alarm

Description

This alarm is reported when the DC voltage is higher than the upper limit ( default value :58V).

Alarm ID	Alarm Severity	Alarm Type
5996	Major	Fault

ID	Name	Meaning
1	Site No.	Number of the site where the faulty board or module is located Value range: 0-2047
2	Board Type	Number of the type which the faulty board belongs to. 72:DPMU
3	Board No.	Number of the fault board Value range:0-8:DPMU
4	PassNo	Number of the passage where the faulty board is located.
5	SubLink No.	Alarm sub-category number 255: None
6	Cell Index	Index of the cell where the board or module is located 0-2047: Cell index of the faulty cell in the data configuration 65535: None
7	Site Type	Type of the site where the faulty board is located. 12:BTS3012; 13:BTS3006C; 14:BTS3002E; 15:BTS3012AE; 16:BTS3012 II; 17:DBS3900 GSM; 18:BTS3900 GSM; 19:BTS3900A GSM;
8	RackNo	Number of the rack where the faulty board is located.
9	BoxNo	Number of the subrack where the faulty board is located.
10	SlotNo	Number of the slot where the faulty board is located.
11	Site Name	Site Name
12	Alarm Attribute	Alarm Character 0:Normal 1:Transient Count

None.

None.

This alarm is generated when the PMU detects that the DC -48 V voltage output by the PSU is above the upper limit ( default value :58V).

Check whether the input mains abnormal exist.
1. View the active alarms, and check whether the AC Overvoltage Alarm and the AC Undervoltage Alarm exist:
  Y => Troubleshoot the faults in the power supply system.
  
  N => Go to procedure 2.
Check the voltage of the –48 V DC power.
1. Check the voltage of the –48 V DC power.
2. Check the overvoltage alarm threshold of the –48 V DC power.
3. Check whether the absolute value of the –48V DC power exceeds the current threshold:
  Y => The voltage of the –48 V DC power exceeds the current threshold. Go to procedure 3.
  
  N => The voltage of the –48 V DC power is normal. Go to procedure 4.
Check whether the PSU is faulty.
1. View the active alarms, and check whether the PSU is faulty:
  Y => The alarm is reported. Go to step b.
  
  N => The alarm is not reported. Go to procedure 4.
2. Replace the faulty PSU. If there is a backup PSU, stop the faulty PSU.
3. Check whether the alarm is cleared:
  Y => The alarm is cleared. The alarm handling ends.
  
  N => The alarm is not cleared. Go to procedure 4.
Replace the PMU.
1. Replace the PMU.
2. Check whether the alarm is cleared:
  Y => The alarm is cleared. The alarm handling ends.
  
  N => The alarm is not cleared. Contact Huawei Customer Service Center.