Chapter 5 Operating Instructions 47
LIEBERT APM UPS Module And Parallel System 30kVA~150kVA User Manual
6.7 Auto Start
Commonly, the UPS rack is start up on static bypass. When the mains power fails, the UPS draws power from the
battery system to supply the load until the battery voltage reaches the end of discharge (EOD) voltage, and the UPS
will shut down.
The UPS will automatically restart and enable output power:
After the mains power is restored
If the Auto Recovery after EOD Enabling feature is enabled
After auto start delay (default setting is 10 minutes), The UPS charges the battery during the auto restart delay
to avoid the power failure risk to the load due to the second time of mains power failure
If the auto start function is not set in the UPS, the user can press Fault Clear to manually start the UPS.
6.8 UPS Reset Procedure
After using EPO to shut down the UPS, or after the UPS is shut down due to inverter over temperature, or overload,
or battery over voltage or too many switching times (BYP: XFER COUNT BLOCK), and after clearing all the faults
according to the prompt information displayed in screen, carry out this procedure to restore the UPS to normal
operation.
After confirming that the fault is cleared, perform the following procedures:
1. Press FAULT CLEAR to reset the EPO status.
2. Press INVERTER ON button on the right side of the operator and control panel for longer than 2s.
Note
The rectifier will be turned on automatically when the overtemprature fault disappears at 5 minutes after the disappearance of
overtemprature signals.
After pressing the EPO button, if the UPS mains input has been disconnected, the UPS is completely powered down.
When the mains input is restored, the EPO condition will be cleared and the UPS system will enable static bypass
mode to restore the output.
Warning
If the maintenance bypass isolatingswitch is put to ON and the UPS has mains input, then the UPS output is emergised.
The UPS module needs 10 minutes to discharge to safe voltage, do not operate on the UPS during this time.
6.9 UPS Power Walk in feature
The UPS rack units has so called “Power walk-in” function to control power modules from battery to mains one by
one to decrease load impact on generator. The rectifiers of modules start one by one in programmable time duration.
This time duration is programmable via Paramset from 5 to 30 seconds. There is also Power walk-in delay timer,
which delay start of Power walk-in function from 1 to 5 second. This feature is appreciated especially in parallel
connection of UPS rack units. Example of Power walk-in function and Power walk-in delay timer is on the Figure 12.1
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