Vertiv NetSure 531 A91 User Manual

Chapter 4 Trouble Shooting 17
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Chapter 4 Trouble Shooting
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 subrack.
4.1 Alarms Handling
The alarms are classified in four levels: critical alarm, major alarm, observation alarm 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.
If an unimportant alarm occurs during the operation of the controller, set it according to the following method.
As alarm of "Rect Lost" for example:
For M221S/M222S controller: MAIN MENU —> Settings —> Alarm —> Alarm Control —> Clear —> For the
submenu of "Clear", you can select "Rect Lost" to clear corresponding alarm.
For M820B controller: MAIN MENU —> Manual —> Rectifier —> Clear Rect Lose.
For M830B controller: Settings—> Alarm Settings—> Clear Rect Lost. , you can select "Yes" to clear corresponding
alarm.
The handling methods of normal alarms are given in Table 4-1.
Table 4-1 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 power to supply the power system, it
is suggested to run the generator five minutes to minimize the impact on the power system
2
AC Voltage High
Check if the AC over-voltage value is too low. If yes, change the value.
A mild over-voltage does not affect the system operation. However, the rectifier will stop operation when
the mains voltage is more than 530V. If the mains voltage is above the AC over-voltage value, the mains
grid should be improved
3
AC Voltage Low
Check if the AC Under- voltage point is too high. If yes, change the value.
When the mains voltage is lower than 304V, the output power of the rectifiers will be derated. And if
lower than 260V, the rectifiers will stop working. If the mains voltage is under the AC under-voltage value,
the mains grid should be improved
4
SPD failure
Check the SPD condition. If the SPD is damaged, replace it
5
DC Volt High
Check the DC over-vlotage value through the controller. If the set value is inappropriate, correct it.
Otherwise, find out the rectifier that has caused the alarm:
1. Ensure that the batteries can operate normally.
2. Switch off the AC input of all rectifiers.
3. Power on the rectifiers one by one.
4. If the over-voltage protection is triggered when a certain rectifier is powered on, that rectifier is the
faulty one. Replace it

Vertiv NetSure 531 A91 Specifications

General

Brand	Vertiv
Model	NetSure 531 A91
Category	Power Supply
Language	English