GAI-Tronics 495-001 Mine Dial / Page Phone Interface Cabinet - Manual (Page 13)

Pub. 42004-198D
Model 495-001 Mine Dial/Page Phone Interface Cabinet Page: 13 of 22
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The All-Call/Merge assembly and the DC Power Transfer assembly should be installed and secured in
their respective enclosures before power is applied to the system. See Figure 4 and Figure 10.
Disengage all of the Plug-in Line Interface cards from their respective sockets prior to the application of
power. The system should be connected to a 120 V ac power source, but other input voltages are
possible. See the “Connecting AC Power to Rack” section on page 8 for details.
Set S701 to the D-PWR. SUPPLY position and turn on (up position) S702 on the Power Supply. See
Figure 8. The amber indicator light (DS701) on the front panel should be lit. The dc voltmeter (M702) of
the front panel should indicate approximately 14 V dc and the charge current (M701) meter should read
0 amp current flow.
Carefully insert the Plug-in Line Interface cards into the rack one at a time observing the front panel
voltmeter. Each time a card is installed, the power supply voltage will dip slightly and return to 14 V.
Each card should draw about 5 mA as indicated on the Power Supply/Metering assembly ammeter. If the
power supply voltage remains below 14 V, or a line interface card draws more than 10 mA, the Line
Interface card is defective and should be replaced.
Connection and Check-out of Stand-by Battery
After the power supply/battery charger has been installed and checked out, connect the yellow wire from
the Power Supply/Metering assembly to the battery positive (+) terminal as shown in Figure 9. Turn the
voltmeter switch to the “B-Battery” position. The voltmeter (M702) should read about 12 V.
The battery should start charging with several hundred mA of current as indicated by the large current
meter (M701) on the front panel of the Power Supply Metering assembly. The charge current will slowly
drop to below 100 mA as the battery nears full charge.
AC Power Failure Alarm Reset and Reset Switch
The green reset indicator (CR504) on the front panel of the DC Power Transfer assembly should be off
and the ac power failure relay contacts will be in the alarm state. See Figure 7 and Figure 10. Press the
reset switch (S501) to reset the power failure alarm relay and light the reset indicator.
The voltmeter on the front panel of the Power Supply Metering Panel assembly should now indicate
about 12 V in all four positions of the meter switch. Positions A, B, C, and D always show 14 V from
power supply.