User Guide

Battery Installation
55 Liebert
®
APM
™
5.5 Non-Standard Batteries
When batteries other than a matching battery cabinet are used, a remote battery disconnect switch
with overcurrent protection is required per the National Electrical Code. Contact your local Emerson
sales representative about this option. Refer to Figures 87 and 88 for details.
Install battery racks, cabinets and batteries in accordance with the manufacturer's instructions.
Verify that the battery area has adequate ventilation and battery operating temperature complies
with the manufacturer's specifications and with all applicable national and local codes.
If you have any questions concerning batteries, battery racks or accessories, contact Liebert Services
at 1-800-543-2378.
5.6 Battery Ground Fault Detection Option
An optional battery ground fault detection device can be added to detect leakage current in the
battery system. The residual current range monitored is 30mA ~ 3000mA. When a battery ground
fault is detected, an alarm will appear on the UPS display panel. The battery ground fault detection
set contains one current transformer (CT). Figures 41 and 42 show the connection of this set for the
Liebert APM.
Figure 41 Battery ground fault detection component location
NOTE
The user-supplied battery DC bypass breakers or fuses should have a minimum overload
rating of 8kA and 500V.
UAM04050A-00
Pg. 1, Rev. 0
Battery
Breaker
Battery
Temperature
Sensor Location
UHRF3S67X2
Liebert APM
Bypass
Module
Front
Right Side
Isometric View - Right Side
UHR93S6A1ZA6
Output EMI Board
CT
ULC366SC1 Ground Fault Detect Board
UHW241M5 Auxiliary Power Board