9-8
Section 9-4 - Power Supply / Battery Charger (DCPS)
Wheelock, Inc. Part Number: 107378
The Power Supply / Battery Charger (Figure 9-4) provides the Single Circuit SAFEPATH
®
Panel with a
power supply/battery charger with an output of 24VDC with a maximum current of 6 Amps. The battery
charger section is capable of charging a 40 AH battery in 48 hours.
The Power Supply is protected with short circuit protection and thermal shutdown. It also contains Form C
contacts for external monitoring of AC Failure and Battery Failure. “AC FAIL” is indicated with a minimum
of (6) hour delay. LOW BATTERY is indicated on the “BAT FAIL” contacts when the battery voltage drops
below 20VDC. NO BATTERY PRESENT is indicated on “BAT FAIL” terminals within 2 minutes.
The AC LED indicates that AC is applied to the Power Supply. The DC LED indicates that the DCPS
output is 24VDC.
DC
BAT
+
-
SW1
AC
AC
AC
+
-
DC
SW2
BAT FAIL
NO NC C
AC FAIL
C NC NO
SMP7PM
GREEN LED - INDICATES AC
VOLTAGE IS APPLIED TO
THIS BOARD
28 VOLT AC INPUT FROM
TRANSFORMER
24 VDC BACKUP
BATTERY INPUT
RED LED - INDICATES POWER SUPPLY
OUTPUT VOLTAGE IS AVAILABLE
BATTERY INPUT
FUSE
24 VDC, 6 AMP OUTPUT
TO MOTHER BOARD
BATTERY SUPERVISION
AC INPUT SUPERVISION
Figure 9-4
Power Supply / Battery Charger (DCPS)
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