Extended Service; Battery Maintenance - Liebert 7200 Series User Manual

7200 Series UPS User Manual
Single Module and 1+1 Parallel System
8. Reconnect the UPS input mains power.
9. Start the UPS and transfer the load to the inverter following the appropriate operating
procedure.
10. If possible, check the battery autonomy time by opening the rectifier input power switch ( Q1
) with the UPS on-load. Close the rectifier input power switch ( Q1 ) immediately the dc
busbar voltage falls within 5 volts of the battery end of discharge voltage. ( note the end of
battery discharge is assumed when the battery voltage falls to 320V d.c. for a 380V a.c.
system; 340V d.c. for a 400V a.c. system; 340V d.c. for a 415V a.c. system ). At this voltage
the battery circuit breaker will trip and the load will transfer to bypass. Ensure that the
available battery autonomy time meets the installation specifications.
5.3.4

Extended service

We recommend that ALL the input/output power cables and their connections are checked
periodically. As this requires the UPS to be completely shut down such a check should be carried out
on an `opportunity' basis but at an interval not exceeding 2 years.
5.3.5

Battery maintenance

The batteries used with the UPS are generally sealed, valve-regulated type, and the only maintenance
requirement is to ensure that the cells are kept clean and dry. Maintenance procedures appropriate to
both valve-regulated and non-sealed batteries vary, and should be obtained from the battery
manufacturer.
document in response to "powersure ups"
Chapter 5 - Maintenance
Scheduled Maintenance
Page 5-3
Issue 6
(03/98)