Install Manual

TP-6906 6/14 23Section 1 Installation Instructions
Kohler Model RXT Automatic Transfer Switch
The RDC2 controller is designed to control the Kohler
Model RXT transfer switch as well as the generator set.
Follow the installation instructions to connect the
transfer switch interface board to the appropriate
terminals on the generator set. The RDC2 controller
uses a Kohler-propietary communication protocol to
communicate with the transfer switch.
When connected to a Kohler Model RXT transfer switch,
the RDC2 controller provides the following features:
D Monitors and displays utility voltage and frequency.
D Schedule loaded exercises from the RDC2 generator
set controller.
D Set the ATS system voltage and frequency.
D Allows calibration of the utility voltage and frequency
at the generator set controller.
D Allows adjustment of transfer switch transfer time
delays from the generator set controller.
RBUS communication connections for a Kohlerr
Model RXT transfer switch
One Model RXT transfer switch can be connected to the
generator set. See Figure 1-11. Use shielded,
twisted-pair cable to connect P10-1 through P10-4 on
the transfer switch interface module to the generator set
terminal block connections A, B, PWR, and COM. See
Section 1.4.8 for communication cable
recommendations and maximum cable length.
Note: Connections 3 and 4 on the generator set are not
used with the Model RXT transfer switch.
1. Customer connection terminal block. See Figure 1-10 for location. Check the decal on the generator set for terminal block
connections.
2. Connect one end of each cable shield to GROUND at the generator set.
3. See Figure 1-13 for cable specifications.
4. Leave the end of each cable shield disconnected at the last device. If accessory modules (PIM or LCM) are connected, see
Section 1.4.9.
Interface Board on the
Model RXT Transfer Switch
Note: Generator set terminal block connections 3 and 4 are NOT USED with the Model RXT ATS.
Generator Set
COM
PWR
B
A
RXT
COM
PWR
B
A
3
GND
RBUS
12VDC
4
4
2
1
Figure 1-11 Model RXT Transfer Switch Communication Connection to Generator Set Terminal Block