Vertiv | Liebert EXS 80kVA UPS | User Manual
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Parallel System and LBS System
3.
At this moment, the external total maintenance bypass should be parallely connected with each UPS’s
bypass.
4.
At this moment, the LCD of each UPS displays 'Maint. Switch Closed'.
Warning
When the UPS is in maintenance mode, the load does not have the mains abnormal protection.
5. Press the remote EPO button of each UPS for 2sec (if any) or unplug the EPO terminal of each UPS to stop
the operation of rectifier, inverter, bypass, and battery, but this action will not affect the maintenance bypass
power the load normally.
•
In maintenance mode, the load is directly fed by the mains power instead of the pure AC power from
the inverter.
6. Disconnect the main input switch Q1, bypass input switch Q2, output switch Q5 and N line switch QN of each
UPS in turn.
At present, all the internal power supply is off, and the LCD no longer displays.
Warning
1. If the maintenance is required, wait 10 minutes for the internal DC bus capacitance discharging.
2.
The parts of UPS circuits also have hazardous voltage, though the rectifier input switch, bypass input switch and
battery switch are disconnected. The UPS maintenance is therefore only applicable to qualified personnel.
6.4.5. Procedures for Isolating One UPS Module from Parallel System
Important
These procedures shall only be carried out by service personnel of Vertiv or under their guidance.
Warning
Before operation, confirm that the system capacity has redundancy to avoid system shutdown due to overload.
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