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Introduction to the Charger....................................................................................... 1
Overview................................................................................................................... 1
Specifications............................................................................................................ 2
Compliance with NFPA Codes and UL Standards................................................... 2
Charger Maintenance................................................................................................ 2
Installing the Charger................................................................................................. 3
Overview................................................................................................................... 3
Installation Precautions and Standards ..................................................................... 3
Battery Precautions............................................................................................... 3
Installation Standards ........................................................................................... 4
Charger Connections, Jumpers, and Switches.......................................................... 4
Connecting AC Power to the Charger ...................................................................... 5
Connecting Batteries to the Charger......................................................................... 6
Mounting the Charger............................................................................................... 8
Mounting the Charger into a CAB-3 Series Cabinet............................................ 8
Mounting the Charger into a BB-55 Battery Box................................................. 9
Connecting the Charger to a Load .......................................................................... 10
Connecting the Charger to a Multiple Load....................................................... 10
Connecting the Charger for Additional Current................................................. 11
Configuring the Charger ......................................................................................... 12
Delay loss of AC Reporting................................................................................ 12
Disable Ground Fault Detection......................................................................... 12
Trouble and Form-C Relay Connections (Optional) .............................................. 13
Installing Optional Meters ...................................................................................... 14
Installing an AM-1.............................................................................................. 14
Installing a VM-1................................................................................................ 15
Installing an MPM-3........................................................................................... 15
Operating the Charger.............................................................................................. 16
Overview................................................................................................................. 16
Starting the Charger................................................................................................ 16
Understanding the LED Status Indicators............................................................... 16
Normal Operation ................................................................................................... 17
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ADT-CHG-120 Instruction 05/01/98 PN 50938:A 1
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The ADT-CHG-120 battery charger is designed to charge lead-acid batteries that provide
emergency standby power for a Fire Alarm Control Panel (FACP). Two 12-volt batteries
are always used in series to supply 24 VDC nominal. The following list gives answers to
some common questions about the charger:
•What types of FACPs can be used with the charger? Any 24 VDC FACP that uses
lead-acid 25 AH to 120 AH batteries and that has the feature to disable the FACP
battery charger.
•Where does the charger mount? You can mount the charger into a CAB-3 Series
Cabinet or into a BB-55 Battery Box.
•How many outputs does the charger provide? The charger provides two output
circuits for connection to multiple loads (such as a power supply, amplifier, auxiliary
amplifier, and so forth).
•What options are available with the charger? You can configure the charger to
disable the charger’s ground fault detection, to delay AC loss reporting (8 or 16 hours),
and to operate with 120 VAC or 240 VAC.
•How long does it take the charger to charge batteries? Typically, it takes 9 hours to
charge 25 AH batteries, 20 hours to charge 55 AH batteries, and 38 hours to charge
120 AH batteries. Refer to “Specifications” on page 2 for details.
Figure 1 identifies features of the charger:
Figure 1 Charger Features
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Specifications
2ADT-CHG-120 Instruction 05/01/98 PN 50938:A
The charger also provides the following features:
• AM-1 ammeter (0-10A) ordered separately
• VM-1 voltmeter (0-50 V) ordered separately
• Disable local ground fault detection
• Selectable loss of AC delay (8 or 16 hours)
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Table 1 contains electrical specifications for the charger:
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The charger complies with the following standards:
• NFPA 72-1993 National Fire Alarm Code
• UL 864 Standard for Control Units for Fire Alarm Systems and UL 1481 Power
Supplies for Fire Alarm Systems
• CAN/ULC-S527-M87
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The charger does not require regular maintenance. While installing the charger, however,
make sure to maintain proper polarity when connecting power leads and battery
connections. To ensure optimal operation of the charger, observe the following:
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Fuses F1, F2 and F3 (15 A, PN 12057)
provide overload and reverse-polarity protection. Replace a blown fuse with a fuse with the
same rating and type.
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Periodically inspect the batteries for corrosion and make sure that
corrosive effects to the batteries do not affect the charger or cabinet.
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Most problems with a charger are due to faulty batteries or loose
connections. If you encounter problems, inspect the charger, the battery, and all
connections for loose wiring or short circuits.
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Only replace batteries with the same charge rate and capacity as
other batteries in the set. For example, if replacing one of four 55 AH batteries, make sure
the replacement battery has the same charge rate and capacity as the other three batteries.
Primary AC power in (TB1) 120 VAC, 60 Hz, 2 A
240 VAC, 50 Hz, 1 A
Form-C relay (TB3) 5 A at 30 VDC
Float charge voltage 27.6 VDC
Maximum charging current 4.5 A
Fuses F1-F3 (PN 12057) 15 A
Battery sizes 25 AH to 120 AH
Charging Time (to charge two fully discharged batteries 25 AH – 9 hours
55 AH/60 AH – 20 hours
120 AH – 38 hours
Table 1 Charger Specifications
ADT-CHG-120 Instruction 05/01/98 PN 50938:A 3
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This section contains instructions and illustrations for installing the charger, divided into
the following topics:
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When installing the charger, observe the following precautions:
Observe polarity when making connections.
Do not connect the Battery Interconnect Cable until instructed.
Batteries, although sealed, contain hazardous acid chemicals.
Charging batteries can cause flammable hydrogen gas.
Take care when handling batteries: batteries are heavy—take care in lifting and
handling them.
Mounting batteries requires proper mounting hardware. Follow the battery
manufacture’s installation instructions
Section Topic(s) Covered Page
InstallationPrecautionsand
Standards Precautions to take when installing the charger
and recommended installation standards. 3
Charger Connections,
Jumpers, and Switches Location and references to connections,
jumpers, and switches used to configure,
maintain, and operate the charger.
4
Connecting AC Power to
the Charger How to connect AC power to the charger. 5
Connecting Batteries to the
Charger How to connect batteries to the charger in two
configurations: using two batteries and using
four batteries.
6
Mounting the Charger How to mount the charger to a CAB-3.
How to mount the charger to a BB-55. 8
Connecting the Charger to
a Load Instructions and illustrations for wiring a charger
to a multiple load and for wiring a charger for a
large system installation.
10
Configuring the Charger Configuring the charger for the following
options:
Delaying loss of AC reporting (DACT); and
Disabling ground fault detection
12
Trouble and Form-C Relay
Connections (Optional) Instructions and illustrations for connecting the
following:
Open Collector Trouble In (JP5)
Trouble Out (JP4)
Master Trouble In (JP6)
Form-C Trouble Relay (TB3)
13
Installing Optional Meters How to install an optional ammeter, voltmeter,
or both. 14
Table 2 Installation Topics
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Charger Connections, Jumpers, and Switches
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An installer should be familiar with the following standards:
• NEC Article 300 Wiring Methods.
• NEC Article 760 Fire Protective Signaling Systems.
• Applicable Local and State Building Codes.
• Requirements of the Authority Having Jurisdiction.
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Figure 2 shows all connections, jumpers, and switches needed to maintain, configure, and
operate the charger:
Figure 2 Charger Connections, Switches, and Jumpers
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Connecting AC Power to the Charger
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ADT-CHG-120 Instruction 05/01/98 PN 50938:A 5
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Caution: Before connecting AC power to the charger—make sure to set the Voltage Select
Switch (SW1) on the charger (Figure 2) to match your AC power source (120 VAC or 240
VAC). Figure 3 shows the voltage selection positions for SW1:
Figure 3 Using SW1 to Select AC Voltage
Figure 4 shows the steps for connecting the charger to the main AC power source.
Figure 4 Connecting AC Power to the Charger
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Step 1: Remove the plastic insulating cover
from TB1.
Step 2: Connect the Earth ground line to
TB1.
Step 3: Connect the Primary Neutral line to
TB1. Step4: Connect the Primary Hot line to TB1.
Check all connections, then replace the
plastic insulating cover.
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Connecting Batteries to the Charger
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you can connect 25 AH –120 AH batteries to the charger. This section provides
illustrations and instructions for connecting two batteries or for connecting four batteries.
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Figure 5 shows how to connect two 25 AH batteries to the
charger:
Figure 5 Connecting 25 AH Batteries
Table 3 contains instructions for connecting batteries to the charger:
Warning: Do not
connect the Battery
Interconnect Cable
at this time.
Refer to “Starting the
Charger” on page 16.
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Step Action
1 Remove all power sources to the charger.
2 Connect the battery negative cable to the TB2 terminal (on the charger labeled
“Battery –” as shown in Figure 5.
3 Connect the battery positive cable to the TB2 terminal (on the charger)
labeled “Battery +” as shown in Figure 5.
4 Proceed to the section “Connecting the Charger.” Do not connect the Battery
Interconnect Cable at this time—refer to “Starting the Charger” on page 16.
Table 3 Connecting 25 AH Batteries
Connecting Batteries to the Charger
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ADT-CHG-120 Instruction 05/01/98 PN 50938:A 7
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Figure 6 shows how to connect four 55 AH batteries to the
charger:
Figure 6 Connecting Four Batteries to a Charger
Table 4 contains instructions for connecting four batteries to the charger:
Warning: Do not
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Interconnect Cable
at this time.
Refer to “Starting the
Charger” on page 16.
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Step Action
1 Remove all power sources to the charger.
2 Tie the batteries in pairs by connecting the battery negative terminals and the
battery positive terminals as shown in Figure 6.
3 Connect the battery negative cable to the TB2 terminal (on the charger labeled
“Battery –”) as shown in Figure 6.
4 Connect the battery positive cable to the TB2 terminal (on the charger) labeled
“Battery +”) as shown in Figure 6.
5 Proceed to the section “Connecting the Charger.” Do not connect the Battery
Interconnect Cable at this time—refer to “Starting the Charger” on page 16.
Table 4 Connecting 55 AH Batteries
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Mounting the Charger
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You can mount a charger into the
bottom row of a CAB-3 Series Cabinet, as long as the charger is within 20 feet of the load.
Typically, a charger mounts into the lower right corner of the CAB-3—beside the power
supply (Figure 7, position 2). If using an additional CAB-3, you can mount the charger in
the lower left corner (Figure 7, position 2). Figure 7 shows the two mounting positions of a
charger into a CAB-3.
Figure 7 Mounting a Charger into a CAB-3 Series Cabinet (CAB-C3 shown)
To mount a charger into a CAB-3 Series Cabinet, follow these instructions:
Position 1: Lower right corner. Position 2: Lower left corner.
Step Action
1 Place the charger chassis mounting slots in line with the mounting holes in the cabinet. If
mounting in position 2, place the charger chassis onto the mounting hooks in the cabinet.
2 Insert the self-tapping screws through the charger chassis mounting slots and into the
mounting holes in the cabinet.
3 Tighten the self-tapping screws.
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Mounting the Charger
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ADT-CHG-120 Instruction 05/01/98 PN 50938:A 9
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You can also mount a charger into a
BB-55 battery box, as long as the BB-55 is within 20 feet of the load. Note that a charger
takes up half the space of the BB-55. This means you only have room left for two 25 AH
batteries in the BB-55. Figure 8 shows the mounting position of a charger in a BB-55.
Figure 8 Mounting a Charger into a BB-55
To mount a charger into a BB-55 battery box, follow these instructions:
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Step Action
1 Place the charger chassis mounting slots in line with the mounting holes in the BB-55.
2 Insert the self-tapping screws through the charger chassis mounting slots and into the
mounting holes in the BB-55.
3 Tighten the self-tapping screws.
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Connecting the Charger to a Load
10 ADT-CHG-120 Instruction 05/01/98 PN 50938:A
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This section provides two applications for connecting a charger to a load. While connecting
a charger to a load, observe the following precautions:
• Make sure all power sources are off to the charger and the load.
• Follow polarity when making connections.
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You can connect a charger to multiple
loads, such as a main power supply, auxiliary power supply, amplifiers, and so forth, as
shown in Figure 9.
Figure 9 Typical Wiring for a Charger to a Multiple Load
To connect a charger as shown in Figure 9, follow these steps:
Step Action
1 Connect the battery+ and battery– terminals of the power supply to the charger
output circuit (TB2: Out 1+ and Out 1–) as shown in Figure 9.
2 Connect the battery+ and battery– terminals of the amplifier to the charger
output circuit (TB2: Out 2+ and Out 2–) as shown in Figure 9.
3 Connect the batteries to the charger (for battery connections see Figure 5 or
Figure 6).
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Connecting the Charger to a Load
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ADT-CHG-120 Instruction 05/01/98 PN 50938:A 11
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You can draw 10 A maximum from
each charger output—with a maximum current draw of 45 A of alarm current from the
charger. To draw additional current from the charger, you can connect a load directly to the
batteries as shown in Figure 10:
Figure 10 Typical Connections for Drawing Additional Current
To connect a charger as shown in Figure 10, follow these steps:
Step Action
1 Connect the Battery+ and Battery– terminals of the power supply to the charger
Battery output (TB2: Batt 1+ and Batt 1–) as shown in Figure 10.
2 Connect the Battery+ and Battery– terminals of the first AA-120 to the charger
output circuit (TB2: Out 2+ and Out 2–) as shown Figure 10.
3 Connect the Battery+ and Battery– terminals of the first AA-30 to the charger
output circuit (TB2: Out 1+ and Out 1–) as shown in Figure 10.
4 Connect the Battery+ and Battery– terminals of the second AA-30 to the Battery+
and Battery– terminals of the first AA-30 as shown in Figure 10.
5 Connect the Battery+ and Battery– terminals of the second AA-120 to the
batteries as shown in Figure 10.
6 Connect the batteries to the charger.
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Configuring the Charger
12 ADT-CHG-120 Instruction 05/01/98 PN 50938:A
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You can configure the charger to do the following:
• Set the charger input power (see Figure 3 on page 5).
• Delay AC loss reporting (for Central Station applications); and
• Disable charger ground fault detection.
Figure 11 shows how to configure the charger for delaying the loss of AC reporting and for
disabling ground fault detection:
Figure 11 Configuring the Charger
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If using a Digital Alarm Communicator (DACT), you must
delay the reporting of an AC loss condition to a central station. This delays activation of the
trouble bus and Form-C trouble contacts when AC fails. You can configure the charger for
an 8-hour or a 16-hour delay as follows:
• 8-hour delay – Cut and remove jumper JP8 on the charger (Figure 11).
• 16-hour delay – Cut jumper JP8; then, cut and remove resistor R100 (Figure 11).
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To disable local (charger) earth fault detection, cut and
remove resistor R104 (Figure 11). Figure 12 contains a simplified block diagram that
shows ground fault detection disabled on a charger connected to multiple power supplies:
Figure 12 Disabling Ground Fault Detection
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ADT-CHG-120 Instruction 05/01/98 PN 50938:A 13
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Table 5 contains descriptions of optional connectors on the charger:
Figure 13 shows charger trouble and Form-C relay connections:
Figure 13 Connections for Optional Devices
Function Connector
Use open collector input and output to daisy
chain a trouble signal through the charger
without affecting charger operation.
JP5 Open Collector Trouble In
JP4 Open Collector Trouble Out
Receive trouble signals from another device,
such as a M500CH. JP6 Master Trouble In
Transmit a charger trouble signal to another
device. TB3 Form-C Trouble Relay
Table 5 Charger Trouble and Form-C Relay Connections
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Installing Optional Meters
14 ADT-CHG-120 Instruction 05/01/98 PN 50938:A
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You can also order and install a ammeter (AM-1), voltmeter (VM-1), or both (MPM-3) for
use with the charger. If mounting an AM-1 or a VM-1, mount the meter to a BB-55 as
shown in Figure 14. If mounting an MPM-3, mount to a power supply (Figure 15) installed
in a CAB-3. Table 6 contains descriptions and part numbers for these optional meters:
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To install an AM-1, follow these steps:
1. Cut jumper JP9 on the charger (Figure 13).
2. Connect the AM-1 harness to JP3 on the charger (Figure 11)—making sure to observe
proper polarity.
3. Mount the AM-1 into a mounting slot on the front of the BB-55 (Figure 14):
Figure 14 Mounting an AM-1 or VM-1 to a BB-55 Battery Box
Item Part Number Description
Ammeter AM-1 0-10 A ammeter with a 3-ft. cable for connection to the
charger (JP3). Mounts into a BB-55 battery box only.
Voltmeter VM-1 0-50 V voltmeter with 3-ft. positive and negative leads
for connection to the charger output circuit. Mounts
into a BB-55 battery box only.
Ammeter and
Voltmeter
Assembly
MPM-3 An AM-1 and VM-1 attached to a mounting bracket.
Mounts onto a power supply.
Table 6 Optional Meters
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ADT-CHG-120 Instruction 05/01/98 PN 50938:A 15
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You can connect a VM-1 across a charger output circuit. For example,
to install a VM-1 to measure voltage from charger output circuit 1, follow these steps:
1. Connect the positive lead to TB2 Out 1 (+). See Figure 13.
2. Connect the negative lead to TB2 Out 1 (–). SeeFigure 13.
3. Mount the VM-1 into a mounting slot on the front of the BB-55 battery box.
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To install an MPM-3, follow these steps:
1. Connect the AM-1 (Figure 13).
2. Connect the VM-1 (Figure 13).
3. Mount the MPM-3 onto a power supply connected to your system, such as an
MPS-400 or MPS-24A (Figure 15).
Figure 15 Mounting an MPM-3
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Overview
16 ADT-CHG-120 Instruction 05/01/98 PN 50938:A
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This section contains information on starting the charger, interpreting the LED Status
Indicators on the charger, and normal operation of the charger.
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Warning: Before starting the charger, do the following:
Follow the installation instructions in Section 2, “Installing the Charger.”
Verify proper polarity on all connections between the charger and the batteries, load,
and optional meters.
Make sure there are no short circuits between leads and between battery terminals.
Make sure the Battery Interconnect Cable(s) is not connected.
To start the charger, follow these steps:
1. Connect AC power to the charger. The AC On LED and Trouble LED go on.
2. Connect the batteries to the charger
3. Connect the Battery Interconnect Cable. The Trouble LED goes off.
4. Connect the charger to the load (such as a power supply, an amplifier, and so on).
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The charger provides nine LED Status Indicators, which are identified in Figure 16. Also
refer to Table 7 for conditions, such as troubles, that cause LEDs to light.
Figure 16 LED Status Indicators
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ADT-CHG-120 Instruction 05/01/98 PN 50938:A 17
Table 7 shows the conditions that cause the charger LEDs to come on:
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The ADT-CHG-120 charges batteries at 4.5 A. When batteries are fully charged, the
charger maintains a float charge of 27.6 VDC at a trickle charge rate of less than 400 mA.
While charging the batteries, the HI and LO Charge LEDs switch on and off approximately
every 20 seconds. Also, one of the 23 V, 25 V, 27 V, or Low Battery LEDs also comes on,
depending on the battery voltage.
LED
Normal Operation
AC Trouble
Disconnected
Battery
Ground Fault
Short Circuit
Faulty Battery
(or less the 21 V)
Trouble (with AC Trouble
Delay used)
Trouble (Master Trouble In
JP6 connected)
AC On
++++++
Trouble
++ +++++
Ground Fault
+
HI Charge
,, , , ,
LO Charge
(Loss of AC)
,++ , ,+,
27 V
,,+ , ,,
25 V
,, , ,,
23 V
,, , ,,
Low Battery
,, ,++,,
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+
LED on.
,
LED on or off, depending on battery voltage. Refer to “Normal Operation.”
Table 7 LED Status Indicators
Table of contents
