Kohler 14RESA Installation And Operation Instruction Manual - Page 11
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Also for Kohler 14RESA: Installation Instructions (4 pages), Troubleshooting Manual (8 pages), Installation Instructions (2 pages), Operation (20 pages)
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2.2 RBUS Communication Connections
Note: The RBUS communication wiring to the APM
must be connected directly to the generator sets
as shown in Figure 7. Other accessories such as
the PIM or load management device must be
connected after the APM.
Measure the cable length from the furthest generator set
to the last RBUS device in the system and compare to
Figure 15. The maximum cable length depends on the
number of optional modules connected. A module can
be an APM, a Model RXT transfer switch, a
programmable interface module (PIM), or a load
management device. See Figure 15 for the maximum
cable lengths for 1, 2, 3, or 4 modules per cable run.
For RBUS communication connections A and B to the
APM, Model RXT transfer switch, load management
device, and/or optional PIM, use 20 AWG shielded,
twisted-pair communication cable.
(two-pair) or Belden #8762 (single-pair) or equivalent
cable is recommended.
For outdoor installations, including those with buried
cables and/or conduit, use outdoor-rated Belden
#1075A or equivalent 20 AWG shielded, twisted-pair
communication cable.
For the PWR and COM connections from TB1 to the
RXT, PIM, and/or load management device, use the
second pair in the two-pair communication cable for
Cable (TB1- PWR and COM)
Belden #9402 or equivalent 20AWG
for indoor installations
Belden #1075A or equivalent 20AWG
for outdoor installations or buried
cables
14 AWG *
12 AWG *
* Use 12 or 14 AWG cable for PWR and COM connections only. For RBUS connections A and B, use shielded, twisted pair communication
cable specified above.
Figure 15 Maximum Communication Cable Lengths for Connection of RBUS Modules to the APM
TT-1596
8/22
short runs, or use 12- 14 AWG cable for longer runs as
shown in Figure 15.
Note: All communication cables must be routed
5. Connect RBUS communication cables (A, B, PWR,
Belden #9402
Maximum length per run, meters (ft.)
Number of Modules (RXT, APM, PIM, or load management device) per Run
1 Module
2 Modules
46
(150)
15
46
(150)
15
137
(450)
137
137
(450)
137
through conduit.
Route the communication
cables in separate conduit from the power
cables.
and COM terminals). See Figure 16.
a. Connect the RBUS connections from the RDC2
controller on generator 1 to terminal block P21,
labelled GEN 1, on the APM diode board.
b. Connect the RBUS connections from the RDC2
controller on generator 2 to terminal block P20,
labelled GEN 2, on the APM diode board.
c. Connect P10 on the the APM PIB circuit board,
which is mounted on the door, to the RXT
interface board. See Figure 16.
d. If an optional PIM and/or load management
device are used, connect the communication
cables from the RXT to the accessory modules
as described in the instructions provided with
each module.
e. Connect the communication cable shields as
shown
in
Figure 16,
disconnected.
3 Modules
(50)
5
(17)
(50)
5
(17)
(450)
107
(350)
(450)
137
(450)
leaving
one
end
4 Modules
Do not use 20AWG
for PWR and COM
Do not use 20AWG
for PWR and COM
107
(350)
137
(450)
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