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Chapter 6 Alarm Handling 41
NetSure 531 AC1 Power Supply System User Manual
Chapter 6 Alarm Handling
This chapter describes the handling of alarms, as well as the preventive maintenance of the system during system
daily operation.
The maintenance personnel must have adequate knowledge about the power system.

Note
1. The maintenance must be conducted under the guidance of related safety regulations.
2. Only the trained personnel with adequate knowledge about the power system can maintain the inner part of the cabinet.
6.1 Handling Alarms
The controller alarms are classified in four types: critical alarm, major alarm, observation and no alarm.
Critical alarm, major alarm: these two types of alarms have strong impacts on the system performance. Whenever
these alarms are generated, users are supposed to handle them immediately. The alarm indicators will be on and
audible indication will be given.
Observation: when this type of alarm is raised, the system maintains normal output for a while. If the alarm occurs
during watch time, it should be handled immediately. If the alarm occurs during non- watch- time, handle it during
watch time. The alarm indicators will be on when observation alarm occurs.
No alarm: if alarms are set as
‘no alarm’ by the users, when these alarms occur, no visible or audible indication will be
generated and the system works normally.
The handling methods of normal alarms are given in Table 6-1.
Table 6-1 System setting parameter description
No. Alarm Handling method
1 Mains Failure
If the failure does not last long, the battery will power the load. If the cause is unknown or the failure
lasts too long, a diesel generator is needed. Before using the generator’s power, it is suggested to run
the generator 5 minutes to stabilize the power output
2
AC Voltage
High
Check if the AC Over-voltage point is too low. Reset the value if too low
A mild over-voltage does not affect the system operation. However, the rectifier will stop operation
when the mains voltage is more than 305V. Therefore, if the power supply is constantly over-voltage,
the mains power network should be improved
3
AC Voltage
Low
Check if the AC Under- voltage point is too high. Reset the value if too high
When the mains voltage is lower than 176V, the output power of the rectifiers will be derated. The
rectifier will stop working if he mains voltage is lower than 80V. If the power supply is constantly
under-voltage, the main power network should be improved
4 DC Volt High
1. Check the system DC output voltage and value of ‘Over’ set on the controller. If the set value is
improper, correct it.
2. Find out the rectifier that has caused the alarm.
First of all, ensure that the batteries can operate normally. Then switch off the AC input MCBs of all
rectifiers. Power on the rectifiers one by one. If the over-voltage protection is triggered when a certain
rectifier is powered on, that rectifier is the faulty one. Replace the fault recitfier
5 DC Volt Low
1. Check the system DC output voltage and value of ‘Under’ set on the controller. If the set value is
improper, correct it
2. If the alarm is caused by mains failure, check if certain loads can be disconnected to prolong the
operation of the whole system
3. If the alarm is due to rectifier fault, find out the faulty rectifier and replace it
4. Compare the total load current with the rectifier current, and the former should not be bigger than the
later at FC voltage, otherwise partial loads must be disconnected to ensure the safe operation of the
whole system. Add several rectifiers to make the total rectifier current bigger than 120% of the total
load current. In addition, there must be at least one rectifier for redundancy standby
6
Load Fuse
Alarm/ Batt
Fuse Alarm
Check if the MCB or fuse of the route is switched off.If the MCB is open, find out the fault and remove
it. Or check the voltage at the alarm fuse. If the voltage is almost 0V, the fuse is normal
Otherwise, the alarm loop is faulty. Please contact Vertiv