Connections; Modbus Connections - Kohler KD800 Operation

1.3.1

Connections

DANGER
Hazardous voltage.
Will cause severe injury or death.
Disconnect all power sources before
opening the enclosure.
Inputs and outputs from the controller base module are
brought out to TB10 in the connection box.
Figure 1-1 for the terminal block location.
connect directly to the controller base module (except
for the Ethernet 3 connection).
TB10 Terminal Strip for input and output connections.
See the generator set wiring diagram for connections.
Inputs and outputs are factory-set; the default settings
are shown in Figure 1-8.
240 VAC Power Connection.
connect a 240 VAC power source for the controller
heater. See Figure 1-1 and the wiring diagram for the
240 VAC power connections to TB10.
Mini USB Connectors for connection to a PC for
firmware updates or saving data files. Two USB ports
are located on the
human-machine interface (HMI). See Figure 1-2. Lift
the hinged panel to access the USB ports.
Ethernet 3 port on the base module can be connected
to a personal computer or network to allow remote
monitoring using VNC.
Additional input and output connections are available
with optional module kits. See Section 4 for accessory
connection details.
1
1. USB Ports
Figure 1-2 USB Ports (back of HMI)
TP-7070 8/20
Do not
The installer must
back of the controller's
1.3.2

Modbus Connections

Use RS-485 cable for Modbus RTU connections.
Belden #9841 or equivalent shielded, twisted-pair cable
is recommended. See Figure 1-3. See the generator
set wiring diagram for the Modbus connection location
on TB10.
The controller also supports Modbus TCP over
Ethernet. Connect to the RJ45 port labeled Ethernet 3
on the controller's base module.
The controller communicates using Modbus as a slave
connection with the Modbus
communication. The controller seeks the system and
See
alternator parameters and diagnostic information then
responds back to the Modbus master.
Note: Only one Modbus master can be connected to
the controller.
serial annunciator and switchgear applications.
Generator Set
Controller
Figure 1-3 Modbus Connections
master initiating the
Examples include the remote
RS-485
up to 1220 m (4000 ft.)
Modbus Master
Section 1 Specifications and Features 15