Cooper Wheelock POWERPATH PS-24-8MC User manual

POWERPATH
PS-24-8MC
POWER BOOSTER
POWER SUPPLY
Installation Instructions
273 Branchport Avenue, Long Branch, NJ 07740-6899 Ph: [phone] Fax: [phone]
Web Site: www.cooperwheelock.com e-mail: [email protected]
A84661-001A
Copyright 2007 Cooper Wheelock, Inc. All rights reserved
Thank you for using our products.
Use this product according to this instruction manual.
Please keep this instruction manual for future reference.

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TABLE OF CONTENTS
1.0 INTRODUCTION AND SPECIFICATIONS: 3
1.1 INTRODUCTION 3
1.2 SPECIFICATIONS 4
1.3 TERMINOLOGY 4
1.4 TERMINAL IDENTIFICATION 5
1.5 LED STATUS 7
1.6 BATTERY MAINTENANCE 7
2.0 INSTALLATION INSTRUCTIONS: 7
2.1 UNPACKING 7
2.2 MOUNTING 7
2.3 WIRING 9
2.4 TROUBLE RELAY STATUS CONNECTIONS 10
2.4.1 AC LOSS TROUBLE TERMINALS 10
2.4.2 COMMON TROUBLE TERMINALS 10
3.0 OPERATION: 12
3.1 MODES OF OPERATION 12
3.2 DIP SWITCH SETTINGS 12
3.3 CLASS “B” OPERATION 13
3.4 CLASS “A” OPERATION WITHOUT OPTIONAL PS-4CA MODULE 16
3.5 CLASS “A” OPERATION WITH OPTIONAL PS-4CA MODULE 20
3.6 MASTER REMOTE OPERATION 24
4.0 TROUBLESHOOTING: 26
5.0 BATTERY CALCULATION SHEET: 27
6.0 WARRANTY STATEMENT: 28
COOPER WHEELOCK INC. COMPATIBLE APPLIANCES: Appendix A
LIST OF FIGURES
Figure 1: Terminal Locations 6
Figure 2: Mounting Dimensions 8
Figure 3: POWERPATH PS-24-8MC 11
Figure 4: Output DIP Switch(s) 12
LIST OF TABLES
Table 1: Terminal Identification 5
Table 2: LED Status Description 7
Table 3: DIP Switch Selection 10
Table 4: Troubleshooting 26

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NOTE: All CAUTIONS and WARNINGS are identified by the symbol . All WARNINGS are printed in bold capital
letters.
WARNING: READ THIS INSTRUCTION MANUAL CAREFULLY. FAILURE TO COMPLY WITH ANY OF THE
FOLLOWING INSTRUCTIONS, CAUTIONS, AND WARNINGS COULD RESULT IN IMPROPER APPLICATION
AND/OR OPERATION OF THESE PRODUCTS IN AN EMERGENCY SITUATION, WHICH COULD RESULT IN
PROPERTY DAMAGE AND SERIOUS INJURY OR DEATH TO YOU AND/OR OTHERS.
1.0 INTRODUCTION AND SPECIFICATIONS:
1.1 INTRODUCTION
The PS-24-8MC POWERPATH is an 8 Amp, 24VDC, filtered and regulated, supervised remote power
supply/charger used for supervision and expanded power driving capability for Fire Alarm Notification Appliance
Circuits. The PS-24-8MC may be connected to any 12V or 24V (FWR or DC) Fire Alarm Control Panel (FACP)
by using a Notification Appliance Circuit (NAC) or a “Dry Contact”. Primary applications include NAC expansion
(supports ADA requirements) and auxiliary power to support system accessories. This unit provides filtered and
regulated 24VDC, 8 Amp up to four (4) Class "B", two (2) Class “A”, or two (2) Class “B” and one (1) Class “A”
Notification Appliance Circuits. With the optional plug-in PS-4CA module 101648 the unit supports (4) Class “A”
Notification Appliance Circuits. Additionally, an auxiliary power output of 3.5 Amps (disconnected upon AC
power loss or an alarm condition) or 200 mAmps (constant) is provided, which can be manually reset. The PS-
24-8MC also contains a battery charger capable of charging up to 20 Amp/Hour (AH) of battery backup.
Batteries larger than 12 AH will not fit inside cabinet, use of an external battery cabinet is necessary.
Two FACP NAC circuits or two “Dry” contact initiating circuits can be connected to the POWERPATH inputs.
These inputs can then be directed to control supervision and power delivery to any combination of the four (4)
outputs.
Each output is rated at 3.0 Amps (Class "B") or (Class "A") and can be programmed to generate a
steady or Code 3 Temporal Horn sound and a strobe output under alarm condition. Total load for the
PS-24-8MC NAC circuits shall not exceed 8.0 Amps.
The PS-24-8MC under non-alarmed condition provides independent loop supervision for Class “A” and Class “B”
FACP NAC circuits. In the event of a loop trouble, the FACP will be notified via the POWERPATH steered input
(IN1 or IN2). In addition there are two sets of trouble reporting terminals, one used for AC power loss reporting
and the other for all troubles. The AC power loss reporting, on the common trouble terminals, can be delayed
for either 30 seconds or 170 minutes. The AC power loss terminals will always report the trouble, 30 seconds
after loss of AC power.
Wheelock horns/strobes, strobes and horns with synchronizing capability can be utilized with the PS-24-8MC.
Audibles can be silenced with only two wires. Additionally, the POWERPATH can provide a temporal coded
signal for appliances that can utilize it.

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1.2 SPECIFICATIONS
Approvals:
• UL Listed 864 Standard for Control Units for Fire Protective Signaling Systems
• Pending: FM
• Pending: MEA approved – NYC Dept. of Buildings
• Pending: California State Fire Marshall (CSFM) approved
• Pending: Fire Protection Bureau (FPB) Chicago
• NFPA 72 compliant
Inputs:
• 120VAC, 50/60Hz, 5.0 Amps Operating Power in Alarm
• 24VDC Battery Backup Connection
• Two (2), 12V or 24V NAC Initiating Circuits (8-33V at 7mA) FWR or DC
• Two (2) “Dry” Contact initiating Circuits
• Accepts two (2) Class “A” or two (2) Class “B” circuit inputs
• Built in battery charger for sealed lead acid or gel type batteries up to a 20 AH.
Batteries larger than 12 AH will not fit inside cabinet, use of an external battery cabinet is necessary.
Outputs:
• NAC outputs are 24VDC, 3.0 Amps each, power limited
• 8 Amps total alarm current for the unit
• Capable of four (4), Class "B" circuits
• Capable of two (2) Class “A” circuits
• Capable of four (4) Class “A” circuits (with optional PS-4CA module)
• Capable of one (1) Class “A” circuit and two (2) Class “B” circuits
• Temporal (Code 3) or constant voltage output generation
• Built-in Wheelock synchronization mode that can be fed to any or all of the output circuits
• Input and output can be synchronized with “IN>OUT SYNC” mode (SM, DSM or 2nd PS-24-8MC is
required)
• Audible silence capability
• Filtered and electronically regulated output
• 3.5 Amp auxiliary power limited output with reset capability. (Removed upon AC loss or alarm. Automatic
reset 30 seconds after AC power returns or the alarm condition is over) or 200 mAmps auxiliary power
limited output which remains on during AC loss or an alarm condition.
Supervision:
• Compatible with 12V or 24V (FWR or DC) FACP
• Signaling appliance loops are supervised and steered to either IN1 or IN2
• 2.2K Ohm, 1 Watt (Wheelock Model #MPEOL) End of Line Resistor (EOLR) for supervision of all outputs
• AC loss trouble reported over a separate set of contacts (delay of either 30 seconds)
• All troubles are reported over the common trouble contacts (AC loss can have a delay of 30 seconds or
170 minutes)
• Automatic switchover to standby battery when AC fails
• Thermal and short circuit protection with auto reset
• Input and output status LED indicators
• AC fail supervision
• Battery presence and low battery supervision
• Ground Fault Detection (60K ohms)
1.3 TERMINOLOGY
CLASS “A” = STYLE Z
CLASS “B” = STYLE Y
FACP = Fire Alarm Control Panel
EOLR = End of Line Resistor
NAC = Notification Appliance Circuit
AH = Ampere/Hour
SM = Wheelock Sync Module with single output.
DSM = Wheelock Dual Sync Module with two outputs.
C = Common
NC = Normally Closed
NO = Normally Open

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1.4 TERMINAL IDENTIFICATION
Table 1: Terminal Identification
Terminal Block
Identification
Numbers (Figure 1)
Terminal
Identification Function/Description
TB1-1-3 N,G,L AC power input terminals 120VAC, 50-60Hz.
TB5-1, 2 + BAT - 24VDC Battery connection.
TB7-1, 2 IN1+,IN1- These terminals connect to the input voltage source (i.e. 12VDC or
24VDC FACP). The FACP will supply a voltage from 8-33V (FWR or DC)
at 7mA. During the alarm condition these inputs will cause the designated
outputs to drive the notification appliances (designated outputs are set by
output DIP switch banks). During Stand-by the PS-24-8MC can report
troubles from the designated loop by opening the FACP’s initiation loop.
During an alarm condition the PS-24-8MC closes the loop to ensure that
the alarm condition will be passed through to the next device on the loop.
TB7-3, 4 RET1+, RET1- EOLR is connected on these terminals corresponding to IN1+ and IN1-,
or the loop may be continued to other power supplies or appliances
before terminating.
TB8-1, 2 IN2+, IN2- Same as IN1+, IN1- for corresponding terminals.
TB8-5, 4 RET2+, RET2- Same as RET1+, RET1- for corresponding terminals.
TB7-5, 6 C “DRY1” NC Dry contacts are used to actuate the designated outputs. Contacts are
normally closed and actuate the power supply on contact Open.
Designated outputs correspond to IN1+,IN1-. NOTE: Wiring must remain
in the same room in conduit. NOTE: FACP NAC circuit cannot energize
the power supply by these contacts. NOTE: When these terminals are
not in use, a jumper must be connected across them.
TB8-5, 6 C “DRY2” NC Operates the same as IN2+,IN2- for corresponding terminals. When
these terminals are not in use, a jumper must be connected across them.
NOTE: Wiring must remain in the same room in conduit.
TB6-1, 2
TB6-3, 4
TB6-5, 6
TB6-7, 8
+OUT1-
+OUT2-
+OUT3-
+OUT4-
Indicating appliances are connected to these outputs (See Examples in
Operation Section). Each output can supply a maximum load of 3.0
Amps Class "B" or Class "A" and can be individually programmed for
Normal Mode, Temporal Mode, IN>OUT SYNC Mode, or WHEELOCK
SYNC Mode. The outputs can be configured as four Class "B" circuits,
two Class "A" circuits, or two Class "B" and one Class "A" circuits. With
the optional PS-4CA module 101648 the unit can provide four Class “A”
circuits. Outputs are controlled by a designated input (INPUT 1 or 2) as
selected by the DIP switch for that output. NOTE: When the panel has
been set to synchronization mode, IN1 is used for strobe activation and
IN2 is used for audible silence. Individual output control is disabled.
TB4-1-3 “NO” “C” “NC”
(COMMON
TROUBLE
OUTPUT)
Typically used to trigger remote alerts or other reporting appliances.
Form C contacts rated 28VDC at 1 Amp. Resistive
TB2-1-3 “NO” “C” “NC”
(AC LOSS
TROUBLE
OUTPUT)
Used for local reporting of AC power loss to trigger remote alerts or other
reporting appliances. Form C contacts rated 28VDC at 1 Amp. Resistive
TB9-1, 2 + AUX - AUX output is rated 20.1 to 28VDC, special applications. (See Appendix
A for suitable devices). In MP mode: AUX output is capable of 3.5Amps,
and can be reset by a momentary switch on the board. The 3.5 Amps of
power is disconnected when AC power is lost or the unit is in alarm. The
3.5 Amps of power is reconnected 30 seconds after AC power returns or
the alarm condition is over. In CP mode: The AUX output is capable of
200mAmps with 12AH battery or 70mAmps with 7AH battery. In CP
mode, power is available during AC power loss (batteries connected) and
during an alarm condition.

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ASSEMBLED IN USA WITH PRIDE
TB2
TB4
TB7
Figure 1:Terminal Locations

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1.5 LED STATUS
Table 2 lists status of the LED indicators. The ALARM condition occurs when the input causes the output
circuits to energize. The TROUBLE LED’s for OUT1, OUT2, OUT3, OUT4 and, GND FAULT latch ON when
the trouble occurs. They are turned OFF when an alarm condition occurs or the PS-24-8MC system reset
switch (SW5) is pressed. The GND FAULT, BATT and, MICRO FAULT LED’s turn ON when the trouble
occurs. The trouble relays (AC loss and Common trouble) follow the trouble condition and are non-latching.
NOTE: An alarm condition overrides a trouble condition.
Table 2: LED Status Description
LED OFF ON ON
OUT1 STANDBY -------- TROUBLE
OUT2 STANDBY -------- TROUBLE
OUT3 STANDBY -------- TROUBLE
OUT4 STANDBY -------- TROUBLE
INP1 STANDBY ALARM TROUBLE*
INP2 STANDBY ALARM TROUBLE*
GND FAULT -------- TROUBLE --------
AC No AC AC Present --------
BATT -------- TROUBLE --------
MICRO FAULT -------- TROUBLE --------
POWER SUPPLY DC TROUBLE DC PRESENT --------
• NOTE: If INP1 or INP2 LED and OUT1-OUT4 TROUBLE LED are on, TROUBLE exists currently.
1.6 BATTERY MAINTENANCE
Replace batteries every four (4) years or as needed if battery will no longer accept full charge, two 12V
batteries are required. Battery capacity must be in accordance with the proper battery calculation for the
application using BATTERY CALCULATION SHEET provided on page 27.
NOTE: Battery compartment measures 4.50" High 12.50" Wide 5.00" Deep.
2.0 INSTALLATION INSTRUCTIONS:
NOTE: The PS-24-8MC POWERPATH shall be installed in accordance with the National Fire Protection
Association (NFPA), National Electrical Code (NEC) and all applicable state and local regulations.
2.1 UNPACKING
The POWERPATH was carefully checked before leaving the factory. Inspect shipping container and unit
carefully for indications of improper handling. If damage is detected, make an immediate claim to the carrier.
Remove the POWERPATH from the shipping container and check that the door lock keys, door lock, and
battery connection wires are inside. Make sure the printed circuit board is securely mounted to the rear of
the enclosure.
2.2 MOUNTING
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT
TO RAIN OR MOISTURE.
CAUTION: This product is not intended for use in hazardous locations as defined by the National
Electrical Code (NEC) and by the National Fire Protection Association (NFPA).
The POWERPATH unit is to be mounted in an indoor, dry location using the mounting dimensions in Figure
2.
Mount the panel in a location that does not exceed a temperature range of 0C to 49C (32F to 120F)
and a humidity equal to 10% to 93% at 30C (86F) non-condensing.
When mounting on interior walls, use proper screw anchors in plaster. When mounting to concrete,
especially when moisture is expected, first attach a piece of ¾ inch plywood to the concrete surface. Attach
the POWERPATH to the plywood.

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5.00"
7.452"
Figure 2:Mounting Dimensions
DIMENSIONS (H x W x D) - 16.70” x 12.83” x 5.00”
NOTE: All dimensions shown are in inches
CAUTION: Use care when punching out knock-outs to avoid damage to internal components.

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2.3 WIRING
WARNING: MAKE SURE THAT THE TOTAL RMS CURRENT REQUIRED BY ALL APPLIANCES
THAT ARE CONNECTED TO THE PS-24-8MC’s NOTIFICATION APPLIANCE CIRCUITS DOES NOT
EXCEED THE PS-24-8MC’s RATED CAPACITY (8 AMPS MAXIMUM) OR THE CURRENT RATINGS OF
ANY INDIVIDUAL NOTIFICATION APPLIANCE CIRCUIT (3 AMPS MAXIMUM). OVERLOADING THE
PS-24-8MC COULD RESULT IN LOSS OF POWER AND FAILURE TO ALERT OCCUPANTS DURING
AN EMERGENCY, WHICH COULD RESULT IN PROPERTY DAMAGE AND SERIOUS INJURY OR
DEATH TO YOU AND/OR OTHERS.
Review the Operation Section (3.0) in order to select the proper hook-up and use of the POWERPATH. Set
switches and wire the POWERPATH as follows: Terminal and switch locations are shown in Figure 1.
A. Set output DIP Switch(s) to follow corresponding input (IN1, IN2) and desired output mode. See Table
3 DIP Switch Selection and DIP Switch Settings Section (3.2).
B. Set DIP Switch SW7 position 1 & 2 to select Class “A” or Class “B” operation (Off for Class "B", On for
Class "A").
Note: When the PS-24-8MC is used with the optional PS-4CA module, the main board Class switches
must be set to Class “B”.
C. Select the mode of operation for the Auxiliary output (JP2) to either managed power (MP) or constant
power (CP). In the MP mode of operation the Auxiliary output is disconnected upon AC loss or an
alarm condition. The power is reconnected 30 seconds after AC power returns or the alarm condition
is over. The power is not disconnected when in the CP mode of operation.
D. Select the delay, before AC loss trouble will be reported to the common trouble terminals (JP1) to
either SHORT DLY or LONG DLY. LONG DLY is 170 minutes and SHORT DLY is 30 seconds.
E. If using the optional PS-4CA module install it now.
F. Dress the battery wires down to the back of the enclosure, observing ¼” separation of power limited
wire V.S. non-power limited wiring. See Figure 3.
G. Connect notification appliances to desired outputs OUT1 – OUT4 See Operation Section (3.0).
• The POWERPATH has in-out wiring terminals that accept two #18 to #12 American Wire Gauge
(AWG) wires at each screw terminal. Strip leads 3/8 inches and connect to screw terminals.
Maximum line impedance is 39 ohms or 3.4 volt drop, whichever is more.
• Separate all in-out wire runs on supervised circuits to insure integrity of circuit supervision. The
polarity shown in the wiring diagrams and on the circuit boards is for operation of the appliances.
The polarity is reversed by the FACP during supervision.
• Total load for the PS-24-8MC NAC circuits shall not exceed 8.0 Amps.
• Total load of any NAC output circuit shall not exceed 3.0 Amps.
• In Class “B” mode of operation terminate unused outputs with a 2.2K Ohm EOLR.
• In Class “A” mode of operation connect unused outputs to there respective returns.
• When using the optional PS-4CA module connect unused outputs to there respective returns.
H. Connect the NAC circuit(s) from the FACP to the desired input(s), IN1 and IN2. Connect EOLR to
RET1 and RET2. The value is determined by FACP manufacture.
I. Connect desired auxiliary equipment to the auxiliary output terminals +AUX-.
J. Connect AC loss trouble relay as desired.
K. Connect the common trouble relay as desired.
L. Connect AC source. The AC source shall be connected to a dedicated, non-switch power source.
The AC must first be wired into the buildings main electrical power. The conduit entry can be either
from the top or left hand side using the knock-outs. See Figure 3. Connect Earth Ground First.
M. Connect backup batteries. Observe correct polarity, use two of the same connected in series. Use
either a 7AH or a 12AH battery depending on circuit loading, BATTERY CALCULATION SHEET is
provided on Sheet 27.
N. Install battery cover between both battery wires and Power Limited Wiring. See Figure 3.
O. Press Auxiliary Power Reset, SW6 to ensure that Auxiliary Power is present.
P. Close door and lock.

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Table 3: DIP Switch Selection
Function Switch Position Description Note
INPUT
SELECT ON
OFF
Selected output to be controlled by Input 1 (IN1+, IN1-) (DRY1)
Selected output to be controlled by Input 2 (IN2+, IN2-) (DRY2)
------
------
TEMPORAL ON Generates Code 3 temporal signal on this output. 1
IN>OUT SYNC ON Allows a sync signal on the input to be used by the output. ------
WHEELOCK
SYNC MODE WHEELOCK SYNC “ON”
IN>OUT SYNC “ON” Generates Wheelock sync signal for synchronizing Wheelock horns
and strobes. 2
NOTE 1: Use only with appliances that can operate using a coded horn appliance. (Example: Wheelock
Series CH, and Series MT)
NOTE 2: Use only with Wheelock Series AS/AH, Series NS/NS4/NH, Series RSS and products with SL/SLM
strobes.
2.4 TROUBLE RELAY STATUS CONNECTIONS
2.4.1 AC LOSS TROUBLE TERMINALS
The AC LOSS TROUBLE TERMINALS are located on the left side of the PC board and used for
transmission of local trouble annunciation. The three terminals are labeled “NO”, “C” and “NC”. When
the PS-24-8MC is operating normally the “NC” “C” terminals are shorted, and the “C” “NO” terminals
are open. This set of terminals reports AC LOSS after a 30 second delay. (Immediate/Short Delay
Only).
2.4.2 COMMON TROUBLE TERMINALS
The COMMON TROUBLE TERMINALS are located on the left side of the PC Board. The three
terminals are labeled “NO”, “C” and “NC”. When the PS-24-8MC is operating normally the “NC” “C”
terminals are shorted, and the “C” “NO” terminals are open. There are five trouble conditions that will
cause these terminals to change state.
• Supervision trouble on any output
(+OUT1-, +OUT2-, +OUT3-, +OUT4-) • Battery Fail
• Micro Processor Fault • GND Fault
• AC Loss
When the trouble is cleared the COMMON TROUBLE TERMINALS return to the operating normally
condition.
AC LOSS reporting on the COMMON TROUBLE TERMINALS can be selected for 30 seconds (Immediate/Short
Delay) or 170 minutes (Long Delay). (170 minutes is used for delay of Off-premise trouble
annunciation)

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TB2
TB7
TB4
Figure 3:POWERPATH PS-24-8MC

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3.0 OPERATION:
3.1 MODES OF OPERATION
The PS-24-8MC POWERPATH can provide 24VDC output when initiated by a 8V to 33V (FWR or DC)
appliance (IN1 or IN2) or an open contact (DRY1 or DRY2). The output will remain on until the
deactivation of the input returns it to standby mode.
The outputs can be configured as four Class “B” circuits, two Class “A” circuits, or two Class “B” and one
Class “A” circuits. With the optional plug in PS-4CA module 101648 the unit supports four Class “A”
Notification Appliance Circuits.
Each Class "A" circuit or Class "B" circuit is 3.0 Amps. Total load for the PS-24-8MC NAC circuits shall not
exceed 8.0 Amps.
There are four output modes which can be used with either Class “A” or Class “B” circuits.
NORMAL MODE Used for a constant 24VDC output.
TEMPORAL MODE Provides a temporal output for appliances that can utilize a coded
signal. (i.e. single stroke bells and chimes and some horns) (NOTE:
Do not use with Wheelock AS, NS, RSS appliances.)
IN>OUT SYNC MODE Allows ONLY a coded signal or Wheelock synchronization signal input
to be utilized by the POWERPATH. This signal may come from a
FACP, another PS-24-8MC or a Wheelock Synchronization Module
(SM-12/24 or DSM-12/24). Audibles can also be silenced.
WHEELOCK SYNC MODE Activates the built-in Wheelock Synchronization Mode for use with
patented Wheelock synchronized horns and strobes. Audibles can
also be silenced.
3.2 DIP SWITCH SETTINGS
The following is the DIP Switch settings for the Outputs.
When switches are changed, press SYS RESET and wait 10 seconds before activating.
Figure 4:Output DIP Switch(s)
1234
ON
IN>OUTSYNC
WHEELOCK SYNC
TEMPORAL
INPUTSELECT
OUT1-4
MODE DIP SWITCH SETTING
NORMAL MODE INPUT SELECT (1) “ON” for “IN1” or “DRY1”
“OFF” for “IN2” or “DRY2”
TEMPORAL (2) “OFF”
WHEELOCK SYNC (3) “OFF”
IN>OUT SYNC (4) “OFF”
TEMPORAL INPUT SELECT (1) “ON” for “IN1” or “DRY1”
“OFF” for “IN2” or “DRY2”
TEMPORAL (2) “ON”
WHEELOCK SYNC (3) “OFF”
IN>OUT SYNC (4) “OFF”
IN>OUT SYNC INPUT SELECT (1) “ON” for “IN1” or “DRY1”
“OFF” for “IN2” or “DRY2”
TEMPORAL (2) “OFF”
WHEELOCK SYNC (3) “OFF”
IN>OUT SYNC (4) “ON”
WHEELOCK SYNC INPUT SELECT (1) “ON” for “IN1” or “DRY1”
“OFF” for “IN2” or “DRY2”
TEMPORAL (2) “OFF”
WHEELOCK SYNC (3) “ON”
IN>OUT SYNC (4) “ON”

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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
1234
ON
OUT1-4
IN>OUT SYNC
WHEELOCK SYNC
TEMPORAL
INPUTSELECT
OREOLR
(2.2KOHMS)
TO NEXTAPPLIANCE
OREOLR
+
-
IN1
RET1
-
+
OUT1
+
-
A
P
C
F
TONEXTAPPLIANCE
OREOLR
(2.2KOHMS)
TONEXTAPPLIANCE
OUT2
-
+
TONEXTAPPLIANCE
OREOLR
(2.2KOHMS)
+
-
OUT3
OREOLR
(2.2KOHMS)
TONEXTAPPLIANCE
OUT4
-
+
1234
ON
SW7
STROBE AUDIBLE
LEGEND
Example 2: TEMPORAL MODE (CLASS B)
POWERPATH
OUT1
IN>OUTSYNC
WHEELOCK SYNC
TEMPORAL
INPUTSELECT
TONEXTAPPLIANCE
OR EOLR
+
-
IN1
RET1
-
+
-
+
OUT3
OUT4
EOLR
2.2K OHMS
EOLR
2.2K OHMS
P
C
A
F
+
-
+
OUT1
-
TONEXTAPPLIANCE
OR EOLR
(2.2KOHMS)
TONEXTAPPLIANCE
OR EOLR
(2.2KOHMS)
OUT2
-
+
1
23
4
OUT2-4
IN>OUT SYNC
WHEELOCKSYNC
TEMPORAL
INPUTSELECT
1
23
4
ON
ON
1234
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.

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Example 3: IN>OUT SYNC MODE from CODED INPUT SOURCE (CLASS B)
POWERPATH
OUT1-4
IN>OUTSYNC
WHEELOCK SYNC
TEMPORAL
INPUTSELECT
TONEXTAPPLIANCE
OR EOLR
+
-
IN1
-
+
IN2
-
+
+
RET2
-
CODED
F
A
C
P
-
+
OUT3
OUT4
EOLR
2.2K OHMS
EOLR
2.2K OHMS
+
-
OUT2
-
+
+
-
OUT1
OREOLR
(2.2KOHMS)
TONEXTAPPLIANCE
OREOLR
(2.2KOHMS)
TONEXTAPPLIANCE
1
23
4
ON
RET1
1234
ON
SW7
Minimum pulse duration for coded signals must be greater than 0.25 seconds.
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.
Example 4: IN>OUT SYNC MODE with External Sync Module without Audible Silence
(CLASS B)
POWERPATH
OUT1-4
IN>OUTSYNC
WHEELOCKSYNC
TEMPORAL
INPUT SELECT
TONEXTAPPLIANCE
OR EOLR
-
+
IN1
-
+
RET1
+ OUT1
+ IN1
MINUS 1
+AUDIBLE
SM/DSM
F
A
C
P
-AUDIBLE
EOLR
2.2K OHMS
EOLR
2.2K OHMS
+
OUT4
-
+
OUT3
-
EOLR
2.2K OHMS
-
+
OUT2
+
-
OUT1
TONEXT
APPLIANCE
OREOLR
(2.2KOHMS)
1
23
4
ON
1234
ON
SW7
NOTE: When using the Wheelock external Sync Module (SM or DSM), synchronization will only occur with
Wheelock sync appliances.

P84662J Page 15 of 28
Example 5: IN>OUT SYNC MODE with External Sync Module with Audible Silence
(CLASS B)
POWERPATH
OUT1-4
IN>OUTSYNC
WHEELOCK SYNC
TEMPORAL
INPUTSELECT
TONEXT
APPLIANCE
OR EOLR
-
+
IN1
-
+
RET1
+ OUT1
+IN1
MINUS 1
+AUDIBLE
SM/DSM
F
A
C
P
EOLR
-AUDIBLE
EOLR
2.2K OHMS
EOLR
2.2K OHMS
+
OUT4
-
+
OUT3
-
EOLR
2.2K OHMS
-
+
OUT2
+
-
OUT1
OR EOLR
(2.2K OHMS)
TONEXTAPPLIANCE
1
23
4
ON
1
23
4
ON
1
23
4
ON
1234
ON
SW7
NOTE: When using the Wheelock external Sync Module (SM or DSM), synchronization will only occur with
Wheelock sync appliances.
Example 6: WHEELOCK SYNC MODE without Audible Silence (CLASS B)
POWERPATH
OUT1-4
IN>OUT SYNC
WHEELOCKSYNC
TEMPORAL
INPUT SELECT
IN1
+
-
IN2
+
-
TONEXTAPPLIANCE
OREOLR
+
RET2
-
P
C
A
F
RET1
+
-
-
OUT4
-
+
OUT3
+
OUT2
-
+
EOLR
2.2K OHMS
EOLR
2.2K OHMS
EOLR
2.2K OHMS
+
-
OUT1
TONEXTAPPLIANCE
OR EOLR
(2.2KOHMS)
1
23
4
ON
1
23
4
ON
1
23
4
ON
1234
ON
SW7
• This mode will only synchronize Wheelock horns, horn strobes, and strobes with the synchronization capability.
• If only strobes are connected to the POWERPATH outputs, the initiating input to IN2 is not required.
• When synchronized horns are used on the two wire output of the POWERPATH, IN2 must be connected as
shown or the horns will not operate.

P84662J Page 16 of 28
Example 7: WHEELOCK SYNC MODE with Audible Silence (CLASS B)
TONEXTAPPLIANCE
(2.2K OHMS)
OREOLR
-
OUT1
+
+
-
2.2K OHMS
EOLR
-
+
+
-
2.2K OHMS
EOLR
2.2K OHMS
EOLR
OUT4
OUT3
OUT2
AUDIBLE
P
A
C
F
-
RET1
+
OR EOLR
TONEXTAPPLIANCE
SILENCE
-
+
IN1
-
+
IN2
+
RET2
-
TONEXTAPPLIANCE
OREOLR
INPUT SELECT
TEMPORAL
WHEELOCK SYNC
IN>OUT SYNC
OUT1-4
POWERPATH
1
23
4
ON
1
23
4
ON
1
23
4
ON
1234
ON
SW7
• This mode will only synchronize Wheelock horns, horn strobes, and strobes with the synchronization capability.
3.4 CLASS “A” OPERATION WITHOUT OPTIONAL PS-4CA MODULE
Class “A” circuit 1 uses “OUT1” and “OUT3”. Class “A” circuit 2 uses “OUT2” and “OUT4”. When
operating in Class “A” the two circuits must have the same switch settings for the operational mode
selected. Switch SW7 position 1 & 2 on the PC board are in the “ON” position.
• 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. Switch SW7 position 2 controls Outputs 2 and 4.
• DIP Switch settings for each circuit in the Class “A” output must be set identically.
Example 8: NORMAL MODE (CLASS A)
POWERPATH
1
2
3
4
ON
OUT1-4
IN>OUT SYNC
WHEELOCK SYNC
TEMPORAL
INPUTSELECT
OUT4
OUT2
OUT3
+
-
-
+
OUT1
-
+
+
IN1
-
TONEXTAPPLIANCE
OREOLR
RET1
+
-
F
C
P
A
OR RETURN
TO FACP
(CLASS "A")
-
+
1234
ON
SW7

P84662J Page 17 of 28
Example 9: TEMPORAL MODE (CLASS A)
POWERPATH
OUT1 OUT3
IN>OUTSYNC
WHEELOCK SYNC
TEMPORAL
INPUTSELECT
OUT4
OUT2
OUT3
+
-
-
+
OUT1
-
+
+
IN1
-
TONEXTAPPLIANCE
OR EOLR
RET1
+
-
F
A
C
P
+
-
OR RETURN
TO FACP
(CLASS "A")
OUT2 OUT4
1
2
3
4
ON
1
2
3
4
ON
1
2
3
4
ON
1
2
3
4
ON
IN>OUTSYNC
WHEELOCK SYNC
TEMPORAL
INPUT SELECT
1234
ON
SW7
CAUTION: Strobes require constant voltage and will not operate properly in the TEMPORAL MODE. A second
Class “A” output set in the NORMAL MODE will provide the constant voltage for the strobe circuit. Only use
sounding appliances that can use a coded signal. Do not use Wheelock AS/AH or NS/NS4/NH appliances with
TEMPORAL MODE.
Example 10: IN>OUT SYNC MODE from CODED INPUT SOURCE (CLASS A)
1
POWERPATH
OUT4
OUT2
OUT3
+
-
-
+
OUT1
-
+
+
IN1
-
RET1
+
-
P
A
C
F
TONEXTAPPLIANCE
OR RETURN
TO FACP
(CLASS"A")
OR EOLR
-
+
-
RET2
+
+
IN2
-
CODED
OUT1 OUT3
IN>OUTSYNC
WHEELOCK SYNC
TEMPORAL
INPUT SELECT
OUT2 OUT4
1
2
3
4
ON
1
2
3
4
ON
IN>OUT SYNC
WHEELOCK SYNC
TEMPORAL
INPUTSELECT
1234
ON
SW9
1
2
3
4
ON
2
3
4
ON
Minimum pulse duration for coded signals must be greater than 0.25 seconds.

P84662J Page 18 of 28
Example 11: IN>OUT SYNC MODE with External Sync Module without Audible Silence
(CLASS A)
POWERPATH
OUT1-4
IN>OUT SYNC
WHEELOCKSYNC
TEMPORAL
INPUTSELECT
OUT2
OUT3
+
-
-
+
OUT1
-
+
TONEXTAPPLIANCE
OR EOLR
-
+
IN1
-
+
RET1
+ OUT1
+ IN1
MINUS 1
+AUDIBLE
SM/DSM
F
A
C
P
-AUDIBLE
+
-
OUT4
1
2
3
4
ON
1234
ON
SW7
NOTE: When using the Wheelock external Sync Module (SM or DSM), synchronization will only occur with
Wheelock sync appliances.
Example 12: IN>OUT SYNC MODE with External Sync Module with Audible Silence
(CLASS A)
POWERPATH
OUT4
+
-
OUT2
OUT3
-
+
OUT1
-
+
TONEXTAPPLIANCE
OREOLR
-
+
IN1
-
+
RET1
+ OUT1
+ IN1
MINUS 1
+AUDIBLE
SM/DSM
F
A
C
P
EOLR -AUDIBLE
AUDIBLE
SILENCE
+
-
OUT1-4
IN>OUT SYNC
WHEELOCKSYNC
TEMPORAL
INPUT SELECT
1
2
3
4
ON
1234
ON
SW7
NOTE: When using the Wheelock external Sync Module (SM or DSM), synchronization will only occur with
Wheelock sync appliances.

P84662J Page 19 of 28
Example 13: WHEELOCK SYNC MODE without Audible Silence (CLASS A)
POWERPATH
OUT4
OUT2
OUT3
-
+
OUT1
-
+
-
+
IN2
-
+
IN1
C
P
F
A
RET1
-
+
TONEXTAPPLIANCE
OR RETURN
TO FACP
(CLASS "A")
OR EOLR
-
RET2
+
-
+
+
-
OUT1-4
IN>OUT SYNC
WHEELOCKSYNC
TEMPORAL
INPUTSELECT
1
2
3
4
ON
1234
ON
SW7
• This mode will only synchronize Wheelock horns, horn strobes, and strobes with the synchronization capability.
• If only strobes are connected to the POWERPATH outputs, the initiating input to IN2 is not required.
• When synchronized horns are used on the two wire output of the POWERPATH, IN2 must be connected as
shown or the horns will not operate.
Example 14: WHEELOCK SYNC MODE with Audible Silence (CLASS A)
POWERPATH
OUT4
OUT2
OUT3
+
-
-
+
OUT1
-
+
-
RET2
+
IN2
+
-
IN1
+
-
AUDIBLE SILENCE
+
RET1
-
A
F
P
C
OREOLR
ORRETURN
TO FACP
(CLASS "A")
TONEXTAPPLIANCE
TONEXTAPPLIANCE
(CLASS "A")
TO FACP
ORRETURN
OREOLR
+
-
OUT1-4
IN>OUT SYNC
WHEELOCKSYNC
TEMPORAL
INPUTSELECT
1
2
3
4
ON
1234
ON
SW7
• This mode will only synchronize Wheelock horns, horn strobes, and strobes with the synchronization capability.
COMBINATION CLASS “A” AND CLASS “B” HOOKUP
The PS-24-8MC POWERPATH can be configured to have one Class “A” (3.0 Amps) and two Class “B” (3.0 Amps
each circuit) outputs at the same time, with a maximum 8 Amps total for the unit. This is done by Switch SW7
position 1 & 2. NOTE: When SW7 position 1 is ON, OUTPUTS 1 and 3 are the Class “A” circuit. When SW7
position 2 is ON, OUTPUTS 2 and 4 are the Class “A” circuit.
COMBINATION OF MODES
• In Class “B” configuration, each output can be set to an independent mode as desired.
• In Class “B”, IN1 or IN2 can be selected to activate any of the outputs desired.
• In Class “A”, OUTPUT DIP Switches must be set identically for each Class “A” output.

P84662J Page 20 of 28
3.5 CLASS “A” OPERATION WITH OPTIONAL PS-4CA MODULE
When using the PS-4CA Class “A” module switch SW7 position 1 & 2 on the board are in the “OFF”
position.
The following are examples of Class “A” connections with the PS-4CA module. 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.
Example 15: NORMAL MODE (CLASS A using the PS-4CA module)
PS-24-8MC
1234
ON
OUT1-4
IN>OUTSYNC
WHEELOCK SYNC
TEMPORAL
INPUTSELECT
TONEXTAPPLIANCE
OREOLR
+
-
IN1
RET1
-
+
OUT1
+
-
A
P
C
F
1234
ON
SW7
RET1
RET2
RET3
RET4
+
-
+
-
+
-
OUT2
+
-
OUT3
+
-
+
-
OUT4
+
-
PS-4CA
OR RETURN
TOFACP
(CLASS "A")
STROBE AUDIBLE
LEGEND
Example 16: TEMPORAL MODE (CLASS A using the PS-4CA module)
PS-24-8MC
1234
ON
OUT1-4
IN>OUTSYNC
WHEELOCKSYNC
TEMPORAL
INPUT SELECT
TONEXTAPPLIANCE
OR EOLR
+
-
IN1
RET1
-
+
OUT1
+
-
A
P
C
F
1234
ON
SW7
RET1
RET2
RET3
RET4
+
-
+
-
+
-
OUT2
+
-
OUT3
+
-
+
-
OUT4
+
-
PS-4CA
1234
ON
OUT1-4
IN>OUTSYNC
TEMPORAL
INPUT SELECT
OUT1
OUT2-4
ORRETURN
TOFACP
(CLASS "A")
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.