TP-6833 2/16
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Section 4 Communication and Accessory Connections
4.3
Accessory Modules
Hazardous voltage.
Will cause severe injury or death.
Disconnect all power sources before
opening the enclosure.
DANGER
Servicing the transfer switch. Hazardous voltage can
cause severe injury or death.
Deenergize all power sources
before servicing. Turn off the main circuit breakers of all
transfer switch power sources and disable all generator sets
as follows: (1) Press the generator set off/reset button to shut
down the generator set. (2) Disconnect power to all battery
chargers. (3) Disconnect all battery cables, negative (--) leads
first. Reconnect negative (--) leads last when reconnecting the
battery cables after servicing. Follow these precautions to
prevent the starting of generator sets by an automatic transfer
switch, remote start/stop switch, or engine start command
from a remote computer. Before servicing any components
inside the enclosure: (1) Remove all jewelry. (2) Stand on a
dry, approved electrically insulated mat. (3) Test circuits with a
voltmeter to verify that they are deenergized.
This section provides specifications and field
connection information for factory-installed accessory
modules. If the modules are not factory-installed, follow
the instructions provided with the kits to install the
mounting assembly and modules.
The transfer switch uses a standard bus system for
connecting accessory modules to the controller. This
bus incorporates a standard serial communication
interface for passing data back and forth between the
main logic board and the assemblies on the expansion
bus.
The module mounting kit holds up to five optional
modules. The total current draw of all modules must not
exceed 300 mA. See Figure 4-8. Add the current draw
for every module installed to determine the total current
draw. If an External Battery Module is installed and
connected to a battery, there is no current restriction.
The External Battery Module, if used, must be the last
board on the bus.
Module Current Draw Specifications, mA
Alarm Module
75
Standard I/O Module
75
High Power I/O Module
100
Figure 4-8
Option Board Types
4.3.1
Accessory Module Mounting
Mount the accessory modules on the module mounting
plate. Starting at the end of the module mounting
assembly nearest the cable connection, install any I/O
modules first, then install the alarm board, if used. The
external battery module, if used, must be the last
module. See Figure 4-9. The alarm board has a fixed
Modbus address = 5.
Note:
Some models may have the I/O module
assembly installed with the cable connection end
pointing to the side or the bottom. Regardless of
the actual orientation of the assembly, the I/O
modules must be installed closest to the cable
connection, followed by the alarm module and
then the external battery module, if used.
1. Cable connection (defined as the TOP regardless of
orientation)
2. I/O modules (if equipped)
3. Alarm module (if equipped)
4. External battery module (must be last, if equipped)
5. Mounting plate
1
GM46258
3
5
2
2
2
4
Figure 4-9
Module Mounting
