Siemens PAD-3 User manual

Siemens Building Technologies, Inc. Siemens Building Technologies, Ltd.
8 Fernwood Road 2 Kenview Boulevard
Florham Park, New Jersey 07932 Brampton, Ontario L6T 5E4 Canada
P/N 315-099082-9
Fire Safety
Model PAD-3
Distributed Power Module NAC Expander
Installation, Operation, and Maintenance Manual

i
Table of Contents
PREFACE ................................................................................................................................ ii
1. DESCRIPTIONS ...................................................................................................................... 1
1.1 General Design Features .................................................................................................. 1
1.2 Regulatory Standards........................................................................................................2
1.3 General Specifications....................................................................................................... 3
2. INSTALLATION ....................................................................................................................... 5
2.1 Mounting the Enclosure..................................................................................................... 5
2.2 Control Unit Mounting........................................................................................................ 6
2.3 Wire Routing...................................................................................................................... 7
2.4 Terminal Descriptions and Electrical Ratings.................................................................... 8
2.5 Wiring The PAD-3.............................................................................................................. 9
2.5.1 AC Wiring......................................................................................................................... 10
2.5.2 Battery Connection .......................................................................................................... 11
2.5.2.1 Multiple Module Battery Connection................................................................................ 12
2.5.3 Style Y (Class B) Input/Output NAC Wiring..................................................................... 13
2.5.4 Style Z (Class A) Input/Output NAC Wiring..................................................................... 14
2.5.5 Auxiliary Power Supply Output ........................................................................................ 15
2.5.6 Common Trouble Relay................................................................................................... 15
2.5.7 AC Fail Relay................................................................................................................... 16
2.6 Ground Fault Detection Enable/Disable.......................................................................... 16
3. CONNECTION TO CONTROL UNITS .................................................................................. 17
4. SAMPLE APPLICATIONS .....................................................................................................27
4.1 Notification Appliance Power Applications ...................................................................... 27
4.2 Door Holder Applications................................................................................................. 32
5. PROGRAMMING ................................................................................................................... 33
5.1 Dip Switch Settings.......................................................................................................... 33
5.1.1 Selecting the Input/Output Configuration ........................................................................ 34
5.1.2 Setting the Auxiliary Output ............................................................................................. 35
5.1.3 Setting the Input’s Control of their NACs......................................................................... 36
5.1.4 Setting the AC Power Fault Reporting Delay .................................................................. 37
5.2 Jumper Settings............................................................................................................... 38
6. REFERENCE DATA .............................................................................................................. 39
6.1 Wire Selection Guides ..................................................................................................... 39
6.1.1 Resistance of Solid Copper Wire..................................................................................... 39
6.2 Battery Size Calculations................................................................................................. 40
7. COMPATIBLE DEVICES ....................................................................................................... 41
8. TROUBLESHOOTING........................................................................................................... 41
8.1 LED Indicators ................................................................................................................. 41
8.2 Improper Operation .........................................................................................................41
8.3 Trouble Conditions ..........................................................................................................42
8.4 Fuse Replacement .......................................................................................................... 43
9. BATTERY MAINTENANCE ................................................................................................... 44
10. GLOSSARY ........................................................................................................................... 45

ii
PREFACE
Along with the use of this Owner’s Manual, the appropriate following standards and the manufacturers’
instructions for initiating and signaling devices should be used to install and maintain a functioning Fire
Alarm Signaling System.
NFPA 70 National Electrical Code
NFPA 72 National Fire Alarm Code
NFPA 101 Life Safety Code
Other Standards - Contact the authority having jurisdiction for other standards that may apply.
For Publications, contact:
National Fire Protection Association
Batterymarch Park
Quincy, MA 02269

1
1. DESCRIPTIONS
The Model PAD-3 from Siemens Building Technologies, Inc. is a notification and auxiliary power
expander that provides up to 6 amps of 24 volt DC for powering notification appliances and auxiliary
devices. The PAD-3 provides its own AC power connection, battery charging circuit, and battery
connections. Used with a fire alarm control unit, this enables you to connect and distribute power to many
more devices than your control unit may normally allow.
1.1 GENERAL DESIGN FEATURES
Inputs
The PAD-3 has two optically isolated inputs that provide the connection from the fire alarm control unit
notification appliance circuit to the PAD-3. The inputs also provide a connection for returning a trouble
condition to the control unit notification appliance circuit.
The fire alarm control unit supervises its notification appliance circuit used for communicating with the
PAD-3 the same way it supervises ordinary NACs. The inputs on the PAD-3 monitor the polarity of the
voltage coming from the fire alarm control unit’s NACs to determine when to operate the notification
appliance circuit outputs. The PAD-3 emulates the trouble behavior of a NAC by opening the EOL
supervision current for trouble conditions. Note that the PAD-3 will sense the polarity of the fire alarm
control unit’s NACs to drive the outputs whether or not the supervision connection is intact.
The following situations will open the EOL supervision at the inputs indicating a trouble condition:
•No or Low AC power.
•No and Low battery condition.
•Ground fault to the output wiring.
•Auxiliary Power Supply output over-current condition.
•NAC output open, shorted or over-current condition on outputs associated with its input.
Notes:
If input 1 controls all four outputs, a fault on any output will cause input 1 to indicate trouble. The fault
does not affect input 2.
If input 1 controls outputs 1 and 2, and input 2 controls outputs 3 and 4, a fault condition on output 3 or 4
will cause input 2 to indicate trouble. The fault does not affect input 1.
Once the PAD-3’s inputs and outputs are activated, the fire alarm control unit will not be able to sense
trouble conditions through its notification appliance circuit connected to the PAD-3 input circuits. Use the
PAD-3 trouble relay when it is necessary to monitor trouble conditions and active alarm conditions at the
same time.
Notification Appliance Circuit Outputs
The PAD-3 has four dedicated, power-limited, NAC outputs that can be configured as two Style Z (Class
A) or four Style Y (Class B) circuits.
The PAD-3 provides three configuration options that will drive outputs as slaves that will follow the input
or if the inputs are on constant as ANSI temporal code or Sync strobe/horn operation.
Each of the four outputs is rated at 3 amps, though a total of 6 amps maximum can be drawn from the
PAD-3 outputs. The yellow Output LEDs (DS1-DS4) will indicate an open, shorted or over-current
condition on its associated NAC Output.

2
Selection of which input controls which output, and which inputs are Style Z (Class A) and Style Y (Class
B) is done using the 10 position DIP switch on the printed circuit board. Refer to Section 5 for DIP switch
settings.
Auxiliary Power Output
The PAD-3 has a dedicated, power limited, auxiliary output that can be configured in two different ways.
The auxiliary output can either be non-resettable (always on), or configured to switch off when the AC
power goes off to conserve the battery standby power. When the auxiliary power is configured to switch
off, there is a 30-second delay before the auxiliary power is turned off after the AC power goes off. The
auxiliary power is for supplementary purposes only if it is configured to switch off when AC is lost.
The Auxiliary Power Output is rated at 3 amps. Only a total of 6 amps maximum can be drawn from the
PAD-3 outputs. The yellow Aux PS LED (DS5) will indicate an over-current condition on the output.
NOTE: The Auxiliary Power Output may be limited to 1.5 amps in certain circumstances. Please see
Section 6.2, Battery Size Calculation for more details.
Common Trouble Relay
The PAD-3 includes a form C trouble relay that will de-energize for the following trouble conditions:
•No or Low AC power (With selectable delay between 60-180 minutes. Refer to Section 5.1.4 for delay
time settings).
•No and Low battery condition.
•Ground fault to the output wiring.
•Auxiliary Power Supply output over-current condition.
•NAC output open, shorted and over-current condition.
AC Fail Relay
A normally energized relay will be de-energized after no or low AC power without delay. A Form “A”
contact provides a local signaling (audible and visual) of an AC fail at the protected premises.
Battery Charging and Supervision
The PAD-3 provides a battery charging circuit for charging sealed lead-acid batteries. The unit also
supervises for no and low battery conditions.
Ground Fault Detection
The PAD-3 monitors for ground faults to the output wiring. When detected, the unit lights the yellow
GRND LED (DS6) and de-energizes the trouble relay and the input supervision relays.
Environmental
All hardware is suitable for use in an interior or protected location.
Power Limiting
The AC power and battery wiring are not power limited. All other circuits leaving the control unit are power
limited, provided the proper installation rules are maintained.
Transient Protection
Transient protection devices are provided where needed to meet the requirements of UL864.
1.2 REGULATORY STANDARDS
The PAD-3 meets the requirements of industry and government regulatory agencies as noted.
Federal Communications Commission
The PAD-3 meets the class A requirements of the Code of Federal Regulations (CFR 47), Part 15,
subpart J, for electromagnetic field emissions.
Underwriters Laboratories
The PAD-3 control unit is listed under UL Standard 864 for compliance to NFPA Standard 72 for fire service.

3
1.3 GENERAL SPECIFICATIONS
Operating specifications for the PAD-3 are as follows:
Environmental
•Operating temperature
32 - 120°F (0 - 49°C)
•Relative humidity
Up to 93%RH @ 90°F (32°C) non-condensing
•Installation Environment
Indoor, dry
Primary Supply
•Primary Input Voltage: 120 VAC (50/60 Hz) nominal
•Maximum primary input current: 2.5A
Secondary and Trouble Power Supply
•24 volt lead-acid battery set
•Maximum Charge Voltage: 27.8 VDC
•Maximum Charge Current: 3.3A
•Maximum Input Current: 6.1A
•Battery capacity: 7 to 15 A.H. (See Section 6.2, Battery Size Calculation, when using
batteries over 7 A.H.)
Input Circuits
•Two Input circuits
•Connected to power limited source
•Supervised
•Voltage Range: 16-33 VDC/VFW
•Maximum Input Current: 7.0mA
Notification Appliance Circuits
•Operating Voltage Range: Special Application 16-32 VDC
Refer to Siemens Compatible Notification Appliances (P/N 315-096363) for maximum
number per NAC
•Synchronized appliances permitted
•Maximum Alarm Current: 3.0A per circuit (6.0A total for NACs and auxiliary power)
•Four Class B, Style Y circuits or two Class A, Style Z circuits
•Power limited
•Supervised
•Maximum Standby Current: 1.0mA
•Maximum Ripple: 100mVAC
•Maximum Line Resistance: 0.9 ohms @ 3.0 amps, 1.08 ohms @ 2.5 amps, 1.35 ohms @ 2.0
amps, or 1.8 ohms @ 1.5 amps
•Ground fault impedance: 2K ohms (+), 8K ohms (-)

4
Auxiliary Power Output
•Operating Voltage Range: Special Application 18-28 VDC
Compatible devices: TRI-B6R (P/N 500-893536), TRI-R (P/N 500-896224)
•Current:
3 amps max (set to shutdown when AC power fault, battery rating up to 7.0 A.H.)
1.5 amps max (set to shutdown when AC power fault, battery rating up to 15 A.H.)
0.17 amps max (set to on when AC power fault, 24 hours standby, battery rating 7.0 A.H.)
0.44 amps max (set to on when AC power fault, 24 hours standby, battery rating 15 A.H.)
(Refer to Section 6.2, Battery Size Calculation)
•Power limited
•Supervised for ground fault and short
•Ripple: 0.1 VAC maximum
•Ground fault impedance: 24K ohms (+), 12K ohms (-)
Note: The auxiliary power is for supplementary purposes only if it is configured to switch off
when AC is lost.
Common Trouble Relay
•Contact Rating:
2.5A, 30 VDC/VAC maximum, resistive
•Form “C” Contact
AC Fail Relay
•Contact Rating:
2.5A, 30 VDC/VAC maximum, resistive
•Form “A” Contact

5
2. INSTALLATION
CAUTION:
It is recommended that the printed circuit boards be removed for any procedure that may
cause dust, metal shavings, grease or any such matter that may affect the circuit boards
and/or parts.
There may be several sources of power into the control unit. Each source must be
disconnected prior to installing or connecting or disconnecting wiring.
Each output circuit is rated at 3 amps. DO NOT OVERLOAD. Overloading a circuit will
cause it to shut down (power limit).
2.1 MOUNTING THE ENCLOSURE
(For indoor use only in dry environments)
The fire alarm control unit must be mounted in a properly accessible location as required by applicable
codes. Any auxiliary battery box or other accessory not connected through a protective device or a circuit
designed for remote connection must be within the same room and connected through electrical conduit.
Installation is to be done only by qualified personnel who have thoroughly read and understood these
instructions.
When mounting the enclosure on interior walls, use appropriate screw anchors in plaster. When mounting
on concrete, especially when moisture is expected, first attach a piece of ¾-inch plywood to the concrete
surface. Attach the PAD-3 enclosure to the plywood.
Consult the installation instructions included with the enclosure for proper mounting.

6
2.2 CONTROL UNIT MOUNTING
To install the main board, install 3 screws loosely into the bottom mounting holes or mounting rails. Slide
the bottom of the board behind the screws, aligning the screws with the slots in the board. Install a screw
in the center position at the top of the board, and two male standoffs in the top left and top right corners of
the main board. Tighten all fasteners. Next, install the insulator to the standoffs using the two remaining
screws. All mounting hardware is included with the PAD-3 main board. See Figure 2-1 below for details.
Figure 2-1. Mounting the PAD-3-MB
Before installing the PAD-3, the input must first be wired into the building’s main electrical power through
the TB1 terminals. See Figure 2-2 on page 8. Shut off the electrical power to the PAD-3, and then
complete the general installation of the PAD-3 using the information in this section.

7
2.3 WIRE ROUTING
Notes:
All high voltage and non-power limited wiring must be kept separate from power limited
wiring. A ¼” separation must be maintained, with high voltage and non-power limited
wiring running in separate conduit openings from power wiring.
To avoid induced noise (transfer of electrical energy from one wire to another), keep
input wiring isolated from high current output and power-limited wiring. Improper wiring
installation may cause improper operation. Avoid pulling one multi-conductor cable for
the entire system. Instead, separate high current input/output from low current.
Wiring within the cabinet should be routed around the perimeter of the cabinet. It should
not cross the printed circuit board where it could induce noise into the sensitive
microelectronics or pick up unwanted RF noise from the switching power supply circuit.
A. Non-power Limited - High Voltage (AC power) or B
B. Non-power Limited - High Voltage (AC power) or A
C. Non-power limited – (Battery wiring, if separate enclosure required)
D. Power limited (or E)
E. Power limited (or D)

8
2.4 TERMINAL DESCRIPTIONS AND ELECTRICAL
RATINGS
Table 2-1. Terminal Descriptions
Terminal # Description Ratings
TB1
1 Earth Ground
2 AC (white-"neutral") 120 VAC 50/60 Hz, 2.5A max.
3 AC (black - "live”)
TB2
1 Input 1 (+)
2 Input 1 (-) 16 – 33 VDC/VFW, 7mA max.
3 Input 1
4 Input 2 (+)
5 Input 2 (-) 16 - 33 VDC/VFW, 7mA max.
6 Input 2
7 Normally Open contact 2.5 A @ 30 VDC/VAC,
8 Common resistive
9 Normally Open contact
10 Common 2.5 A @ 30 VDC/VAC,
11 Normally Closed contact resistive
12 NAC 1 Output (+) Special Application Even though
13 NAC 1 Output (-) 16-32 VDC, 3A max each output is
14 NAC 2 Output (+) Special Application rated for 3 amps,
15 NAC 2 Output (-) 16-32 VDC, 3A max the total
16 NAC 3 Output (+) Special Application current draw
17 NAC 3 Output (-) 16-32 VDC, 3A max from the 4 NAC
18 NAC 4 Output (+) Special Application outputs and the
19 NAC 4 Output (-) 16-32 VDC, 3A max auxiliary power
20 Auxiliary Power Output (+) Special Application output must not
21 Auxiliary Power Output (-) 18-28 VDC, 3A max (Refer to
Section 1.3 General
Specifications)
exceed 6 amps.

9
2.5 WIRING THE PAD-3
Figure 2-2 shows the general layout of the PAD-3 PC board. This section also provides specific wiring
details for accessories. Consult your control unit manual for specific wiring information on the control unit
being used. If you are using a Siemens control unit, see Section 3 for connections.
Figure 2-2. PAD-3 PC Board Layout
CAUTION HOT

10
2.5.1 AC Wiring
CAUTION HOT
Note: Branch current
must be protected by
a 15A overcurrent
device.
120 VAC 60Hz, 2.5A MAX.
SUPERVISED, NON-POWER LIMITED
Figure 2-3. AC Wiring

11
2.5.2 Battery Connection
The PAD-3 requires a 24V sealed lead-acid battery set. The battery capacity can be from 7 to 15A.H. For
battery sets larger than 7A.H., an enclosure with System 3 rails or a separate battery enclosure is
required.
The following steps and diagram explain how to connect the Siemens BT-33, 7A.H. battery set.
1. Connect black wire to the negative (-) side of battery #2.
2. Connect jumper wire from the positive (+) side of battery #2 to the negative side of battery #1.
3. Connect red wire to the positive (+) side of battery #1.
Figure 2-5. Battery Wiring
BATTERY
CHARGER
1-2 ENABLED
2-3 DISABLED
1-2 CLASS B
2-3 CLASS A
J10
J4
K6
F2
F3
D14
B+
B-
N.A.C.
JUMPERS
J2
J3
J8J7
J5
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
24V BATTERY SET
(7 TO 15.0 AH)
SUPERVISED
NON-POWER LIMITED
INPUT CURRENT (MAX.) : 6.1A
CHARGE VOLTAGE (MAX.) : 27.8VDC
CHARGE CURRENT (MAX.) : 3.3A
Figure 2-4. Battery Installation

12
2.5.2.1 Multiple Module Battery Connection
For applications where multiple PAD-3 boards are mounted in an enclosure with System 3 rails, it may be
possible to connect two boards to a single battery set. When using a single battery set for two boards, the
following rules must be followed:
a) Both PAD-3 boards must be located within the same enclosure and mounted adjacent to each other.
b) The combined battery A.H. rating required for both boards does not exceed 15 A.H.
c) The alarm current must never exceed 6.14A singularly or with 2 PAD-3s combined.
d) One of the PAD-3 boards must have its charging circuit disabled.
e) The PAD-3 with the active charger is limited to 1.5 amps of auxiliary DC power at terminals 18 and
19.
f) Two (2) battery connection splitters (part number 230-299203) are used on the battery set for proper
connection.
The following steps and diagrams explain how to connect two PAD-3 boards to a single battery set.
1. Install a battery connection splitter (see Figure 2-6) to the positive and negative terminals on the
battery set. If the battery set contains two 12-volt batteries to be wired in series, install one splitter on
the positive terminal of battery #1 and the other to the negative terminal of the battery #2.
2. Connect the black wires from both PAD-3 boards to the splitter on the negative terminal of battery #2.
3. If the battery set contains two 12-volt batteries, connect the jumper wire from the remaining single
positive terminal of battery #2 to the negative terminal on battery #1.
4. Connect the red wires from both PAD-3 boards to the splitter on the positive terminal of battery #1.
See Figure 2-7.
5. Disable the battery charger on one of the units. See Section 5.2 for directions.
Figure 2-6. Battery connection splitter Figure 2-7. Dual module battery connection
To Battery Terminal
To each PAD-3
battery connection
terminal
To P
A
D-3
To PAD-3

13
2.5.3 Style Y (Class B) Input/Output NAC Wiring
Figure 2-8 shows how to wire for Style Y (Class B) input and output supervision. Use in/out wiring
methods for proper supervision.
Style Y (Class B) Output Notification Circuits
Figure 2-8 shows four, 1.5 amp devices wired as Style Y (Class B) circuits.
Place a 24K ohm EOL resistor (provided) at the end of each loop to enable notification output supervision
when using all outputs as Style Y (Class B) notification circuits. The 24K EOLs must be wired to the
terminals whether or not you are using all output terminals.
Style Y (Class B) Supervised Input Circuits
Figure 2-8 shows Style Y (Class B) supervised wiring from a fire alarm control unit to the PAD-3 board.
Use the control panel’s EOL resistor installed as shown to enable notification input supervision.
6789
2
13
Input 1
5
4
Input 2 AUX
18
NAC
12
Trouble
Relay NAC
10 11 15
14
13
NAC NAC
17
16
+-
19
-
+
Class B notification
output from fire panel
EOL
(SEE CONTROL UNIT
INSTALLATION
INSTRUCTIONS) 24K 1/2W
140-820405
PART NO.
See Owner's Manual for
Supervised, Power Limited
Notification Appliance Circuit
+
+
Compatible Devices
Style Y, Class B
-
-
MAX. STANDBY CURRENT: 1.0mA
MAX. ALARM CURRENT: 3A
ALARM VOLTAGE: 16 -32 VDC
MAX. RIPPLE: 0.1 VAC
NAC RATINGS:
Polarity shown in
activated condition.
UNIT, POWER LIMITED
FIRE ALARM CONTROL
SUPERVISED BY
7mA MAX.
16-33VDC / VFW
AC Fail
20 21
Figure 2-8. Style Y (Class B) Supervised Input/Output Connections

14
2.5.4 Style Z (Class A) Input/Output NAC Wiring
Figure 2-9 shows how to wire for Style Z (Class A) input and output supervision. Use in/out wiring
methods for proper supervision.
Style Z (Class A) Output Notification Circuits
The configuration shown in Figure 2-9 shows two, 3-amp devices wired as Style Z (Class A) circuits.
When you are using the outputs as Style Z (Class A) circuits, loop the wiring back to the corresponding
circuit pair. For Style Z (Class A) wiring, no external EOL is necessary since it is built into the board.
Style Z (Class A) Supervised Input Circuits
The configuration shown in Figure 2-9 shows Style Z (Class A) supervised wiring from a fire alarm control
unit to the PAD-3 board. Pay close attention to the polarities when wiring the unit and follow these
requirements:
When wiring to terminal 2 and 5 on TB2, you must use two separate wires. Do not loop a single wire or
twist two conductor wires together.
Do not use notification appliances on Style Z (Class A) circuits connected for input. The PAD-3 will detect
voltage across the input circuits, but is not designed to pass the added current load from notification
appliances.
678 9
2
13
Input 1
5
4
Input 2 AUX PS
18
NAC
12
Trouble
Relay NAC
10 11 15
14
13
NAC NAC
17
16 19
AC Fail
20 21
MAX. STANDBY CURRENT: 1.0mA
MAX. ALARM CURRENT: 3A
ALARM VOLTAGE: 16 -32 VDC
MAX. RIPPLE: 0.1 VAC
NAC RATINGS:
Class A notification
output from fire panel NOTE: THIS STYLE USES
2 NAC CIRCUITS
Notification Appliance Circuit
Style Z, Class A
Supervised, Power Limited
See Owner’s Manual for
Compatible Devices
Polarity shown in activated
condition.
CAUTION:
For system supervision,
DO NOT USE LOOPED WIRE
UNDER TERMINALS for terminal
2 and 5. Break wire run to provide
supervision of connections.
In
Out
Correct
Incorrect
Twisting
Two wires
Looping
Single wire
Two separate
wires
16-33VDC / VFW
7mA MAX.
SUPERVISED
BY FIRE ALARM
CONTROL
UNIT, POWER
LIMITED
2
2
2
2
.
Figure 2-9 Style Z (Class A) Supervised Input/Output Connections

15
2.5.5 Auxiliary Power Supply Output
The auxiliary power supply output provides a 24VDC power source. It is unsupervised and power limited.
For applications where the battery charger circuit charges batteries of 7.0 A.H. or less, or if the battery
charger is disabled, this output is limited to 3.0 amps maximum. For batteries between 15 A.H. and 7.0
A.H., this output is limited to 1.5 amps maximum.
TB2
AUX
P.S.
AUXILIARY POWER OUTPUT
3A MAX., 18-28 VDC
(REFER TO SECTION 1.3 GENERAL SPECIFICATIONS)
UNSUPERVISED, POWER LIMITED
Figure 2-10. Auxiliary Power Supply Output Connection
2.5.6 Common Trouble Relay
The PAD-3 board has a Form C trouble relay built into terminals 9-11 of TB2. The trouble relay will de-
energize under a trouble condition.
A typical application of the trouble relay is to connect the PAD-3 normally closed (N.C.) contacts in series
with an EOL of a spare IDC or NAC or monitor input from a fire alarm control unit. This will cause a
trouble on the fire alarm control unit when the PAD-3 opens its trouble contacts.
The common trouble relay will be de-energized after selectable delay (60-180 minutes, refer to Section
5.1.4) if AC is low or lost.
Note: The N.C. contact is the relay contact that is closed when the PAD-3 has power and there are no
trouble conditions.
+
-
N.O.COMN.C.
IDC EOL
INITIATING CIRCUIT
678 9
2
13
Input 1
5
4
Input 2 NAC
12
Trouble
Relay NAC
10 11 15
14
13
AC Fail
CONTROL UNIT
IDC
CONNECTION
TROUBLE RELAY CONTACT
(SHOWN IN NORMAL
STANDBY CONDITION)
5A @ 30VDC/VAC,
RESISTIVE FOR POWER
LIMITED SOURCE
UNSUPERVISED
(SEE CONTROL UNIT
INSTALLATION INSTRUCTIONS)
Figure 2-11. Trouble Relay Connection Example

16
2.5.7 AC Fail Relay
AC Fail Relay provides a normally open (N.O.) Form “A” contact which will be de-energized without delay
if AC is low or lost. It provides a local signal (audible and visual) of AC fail at the protected premises but
will not cause the DACT to signal.
3+
1+
3-
1-
4+
2+
4-
2-
TB13
TB12
123456910 11 12 13 14
Input 1
EOL 24K
½W 5%
P/N 140-820405
Input 2
Trouble
Relay NAC
78
AC Fail
1+
1-
2+
2-
TB3
FS-250 LOOP CKT
*
EOL
3.6K, 1/4W
P/N 140-830185,
or
470 OHMS, 1/4W
P/N 140-820164,
as applicable
*
EOL
1 2 3 4
5
HTRI-S
#1
1 2 3 4
5
HTRI-S
#2
PAD-3
*
EOL
FS-DLC LOOP
NOTES:
1. Program HTRI-S #1 as Status causing, which will not cause the DACT
to signal but will cause local visual and audible signal. It provides a local
signaling of AC fail at the protected premises.
2. Program HTRI-S #2 as Trouble causing, which will cause the DACT to
signal for all common troubles (including AC fail with reporting delay).
Figure 2-12. AC Fail Relay Connection Example
2.6 Ground Fault Detection Enable/Disable
For some applications (when used with RSA-Series annunciators, for instance), the PAD-3 is used to
provide power to an auxiliary device which gets a control signal from a fire alarm panel. The ground fault
reference for the PAD-3 may be different than the reference used by the fire alarm panel, resulting in a
ground fault trouble at the panel even when none exists. To remedy this condition, the PAD-3 can have
its ground fault detection circuit disabled. Once disabled, the fire alarm panel’s ground fault detection
circuitry will detect any ground fault in the system. See Section 5-2 for correct positioning of this jumper,
and see Figure 2-2 for the location of this jumper.