Instruction manual

9-9
Section 9-5 - Dual-Circuit Power Supply (DCPS)
Wheelock, Inc. Part Number: 107378
The Dual-Circuit Power Supply (DCPS) provides the Dual-Circuit SAFEPATH
®
Panel with power
supply/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 DCPS 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 “BATT FAIL” contacts when the
battery voltage drops below 20VDC. NO BATTERY PRESENT is indicated on “BATT FAIL”
terminals within 2 minutes.
The AC LED indicates that AC is applied to the DCPS. The DC LED indicates that the DCPS
output is 24VDC.
Figure 9-5 shows the layout of the DCPS.
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 24VDC OUTPUT
VOLTAGE IS AVAILABLE
BATTERY INPUT
FUSE
24 VDC, 6 AMP OUTPUT
TO MOTHER BOARD
BATTERY SUPERVISION
AC INPUT SUPERVISION
Figure 9-5
Dual-Circuit Power Supply (DCPS)