Vertiv Liebert EXS 80kVA UPS, Руководство пользователя

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Vertiv™ Liebert EXS 80kVA UPS User Manual
6 Parallel System and LBS System
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. Therefore, the UPS maintenance is
applicable to qualified personnel only.
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.
The following procedures apply when one UPS module must be isolated from the parallel system for repair
due to serious fault:
1. Unplugging the EPO terminal stops the operation of rectifier, inverter, bypass and battery, but this
action will not affect other UPSs in parallel system to power the load normally.
2. Disconnect the main input switch Q1, bypass input switch Q2, output switch Q5 of the UPS. At the
moment, all the internal power supply is off and the LCD does not display any more.
WARNING! 1. Post a label at the AC input distribution (generally far away from the UPS) to alert
that the UPS maintenance is being operated.
2. Wait 10 minutes for the internal DC bus capacitance discharging. Then the UPS is completely
shut down.
6.4.6. Procedures for Inserting One Isolated UPS Module in Parallel
System
IMPORTANT! These procedures shall only be carried out by service personnel of Vertiv or under
their guidance.
The following procedures are used to reintegrate a UPS module that has been previously isolated from the
parallel system:
1. The UPS internal cooling fan starts, and the rectifier executes self-check and starts to run (see
Figure 5-2 for power flow page). The rectifier runs in normal state for about 30 seconds, after which
the rectifier start-up phase is complete. Please confirm that the LCD displays bypass and main input
normally, and that the current log window generates an alarm of ‘PowerCAN Comms. Abnormal’ or
‘Discrete Bus Comms. Abnormal’, otherwise you should check that the switch Q2 and switch Q1 have
been closed, and that parallel cables of each UPS have been well connected.
2. Refer to 6.4.2. Parallel System Parameters Setting for the parallel parameters setting for each UPS. Carry
out the following procedures if the UPS is running normally.
3. Press the power button of one UPS, and press the Enter key to start the UPS. Then the run indicator
will be on.
4. After this UPS runs in Inverter mode, close the external output switch (if any), and connect this UPS to
the parallel system.