Vertiv
| Liebert
®
EXM
™
EBC
™
480V User Manual |
28
The Liebert EXM UPS does not include internal back-feed protection. A shunt trip coil of 120V
must be installed in the bypass input breaker if the system does not include a Liebert Bypass
Cabinet. This is a safety feature and will prevent the UPS inverter from back-feeding the bypass
source.
The Alber BDSUi fuse block provides 208V nominal from the UPS output (L-N) and the fuse is
rated at 8A. See
for the Alber BDSUi power wiring.
2.10 Battery Protection
2.10.1 Battery Low-Voltage Warning
Before the end of discharge, the Liebert EXM displays a low battery warning. After this warning,
the battery has the capacity for 5 minutes discharging with full load (default time). The Liebert
EXM can be user-configured to display this warning from 3 to 60 minutes before end-of-
discharge.
2.10.2 Battery End-of-Discharge (EOD) Protection
If the battery voltage is lower than the end-of-discharge voltage, the battery converter will be
shut down.
