Low-Voltage Disconnect Feature; Battery Reset Switch (Sw1/Lvd Pcb) - GE MDS 4790 Series Installation & Operation Manual

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Figure 11. Battery Backup Switch Location

Low-Voltage Disconnect Feature

The Low-Voltage Disconnect Assembly contains a low-voltage discon-
nect circuit. This circuit prevents damage caused when the backup bat-
tery drops below 10.65 volts, such as during an extended AC power
outage.
When the back-up battery voltage drops to 10.65 Volts (± 0.2 V), the
low-voltage disconnect circuit automatically disconnects the battery
from the radio. This stops operation of the radio and protects the battery
from potential damage. When AC power returns, the battery is automat-
ically connected to the power supply for re-charging, and the radio
resumes normal operation.

Battery Reset Switch (SW1/LVD PCB)

Normally, the operation of the Low-Voltage Disconnect Assembly is
fully-automatic. The only exception is when replacing a discharged bat-
tery with a charged battery when AC power is not present. In this case,
it is necessary to press the
MDS 4790/9790 Series I/O Guide
Invisible place holder
OFF ON
(Front Panel Removed)
BATTERY RESET SWITCH
MDS 05-3438A01, Rev. F
on the
SW1