627-500
11
BATTERY STORAGE
Charging the Battery
If the PMX Switchgear has not been placed in service
by the date shown on the tag attached to the switch
operator containing the battery, the battery charger must
be connected to a transformer-isolated 120-volt ac power
source to charge the two 12-volt dc battery packs. See
Figure 2. To connect a 120-volt ac power source to the
battery charger, proceed as follows:
1. Open the switch operator door as described under
“Access to Interior” on page 12.
2. Make sure that the power on/off switch on the battery
charger is in the “OFF” position.
3. Using a voltmeter, check the open-circuit voltage of each
battery pack by placing the probes on the appropriate
“1” and “2” terminals on the battery charger. One set of
terminals is provided for each battery pack. See Fig-
ure 2.
a. If the open-circuit voltage of either battery pack is
less than 10 volts dc, both battery packs must be
replaced. Refer to S&C Instruction Sheet 669-515 for
instructions on replacing the battery packs. Then
proceed to Step 7 below.
b. If the open-circuit voltage of each battery pack is 10
volts dc or greater, continue with Step 4 below.
4. Place the battery-charger input selector switch in the
“EXTERNAL SOURCE” position.
5. Connect a transformer-isolated 120-volt ac power source
to the two terminals marked “EXT/AC” on the battery
charger. Place the power on/off switch on the battery
charger in the “ON” position and charge the battery for
24 hours.
6. After charging the battery, place the power on/off switch
on the battery charger in the “OFF” position. Then
disconnect the 120-volt ac power source, and place the
battery-charger input selector switch in the “VOLTAGE-
SENSOR SOURCE” position.
7. Secure the switch operator door.