User's Manual

044-05156 Rev C 41
4.8.4 Low Voltage Disconnect (LVD)
Low Voltage Disconnect Module
The purpose of the LVD is to monitor the DC bus to regulate the rectifier(s) output voltage with regard to the
needed operating voltage to the system, and the appropriate charge voltage for the batteries. Should AC power fail,
back-up batteries are installed in the system to provide a relatively short operational period, based on the amplifier
load at the time of failure. When the battery performance declines to a predefined limit (21 Vdc in this system), the
LVD controller disconnects the batteries from the load through a 600 amp transfer switch. Disconnecting the
batteries at this threshold prevents permanent damage to the batteries, thereby extending the battery life. Low
voltage alarms sent to the base station provide sufficient time to do initiate an orderly shutdown of the base station
before power is lost.
LVD Rear Panel Connections