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3.3 CLASS “B” OPERATION
Class “B” outputs can be controlled from either IN1 or IN2. Switch SW7 position 1 & 2 on the PC board are
in the “OFF” position.
The following are examples of Class “B” connections. A FACP is used as a representative input.
•
IN1 and/or IN2 can be used for connection to the FACP. The INPUT SELECT Switch (1) selects which
input is to be used to activate the output.
•
Board switch SW7 position 1 & 2 control Class “A” or Class “B” configuration. SW7 position 1 controls
Outputs 1 and 3. SW7 position 2 controls Outputs 2 and 4.
•
The PS-24-8MC requires a 2.2K Ohm End of Line Resistor (EOLR) on each output for proper
supervision.
Example 1: NORMAL MODE (CLASS B)
POWERPATH
1
2
3
4
ON
OUT1-4
IN>OUT SYNC
WHEELOCK SYNC
TEMPORAL
INPUT SELECT
OR EOLR
(2.2K OHMS)
TO NEXT APPLIANCE
OR EOLR
+
-
IN1
RET1
-
+
OUT1
+
-
A
P
C
F
TO NEXT APPLIANCE
OR EOLR
(2.2K OHMS)
TO NEXT APPLIANCE
OUT2
-
+
TO NEXT APPLIANCE
OR EOLR
(2.2K OHMS)
+
-
OUT3
OR EOLR
(2.2K OHMS)
TO NEXT APPLIANCE
OUT4
-
+
1 2 3
4
ON
SW7
STROBE
AUDIBLE
LEGEND
Example 2: TEMPORAL MODE (CLASS B)
POWERPATH
OUT1
IN>OUT SYNC
WHEELOCK SYNC
TEMPORAL
INPUT SELECT
TO NEXT APPLIANCE
OR EOLR
+
-
IN1
RET1
-
+
-
+
OUT3
OUT4
EOLR
2.2K OHMS
EOLR
2.2K OHMS
P
C
A
F
+
-
+
OUT1
-
TO NEXT APPLIANCE
OR EOLR
(2.2K OHMS)
TO NEXT APPLIANCE
OR EOLR
(2.2K OHMS)
OUT2
-
+
1
2
3
4
OUT2-4
IN>OUT SYNC
WHEELOCK SYNC
TEMPORAL
INPUT SELECT
1
2
3
4
ON
ON
1 2 3
4
ON
SW7
CAUTION:
Strobes require constant voltage and will not operate properly in the TEMPORAL MODE. A second
output set in the NORMAL MODE will provide the constant voltage.
CAUTION:
Only use audible appliances that can use a coded signal. Do not use with Wheelock Series AS/AH,
NS/NH or HS4/HS appliances.