TP-6803 6/15
26 Section 1 Installation
tp6803
1. Generator Set Terminal Block. See the dimension drawings in Section 3 for location. Check the decal on the generator set for terminal
block connections.
2. Engine start leads 3 and 4. See the ATS manual for cable size specifications.
Generator Set
ATS
(with engine
start contacts)
A
B
COM
PWR
3
4
1
2
Figure 1-22
Engine Start Connections with Transfer Switch Models other than Model RXT
1.10.2 Communication Cable
Specifications
RBUS Connections A and B
For the RBUS communication connections A and B to
the optional RBUS modules, use 20 AWG shielded,
twisted-pair communication cable.
Belden #9402
(two-pair) or Belden #8762 (single-pair) or equivalent
cable is recommended. Optional RBUS modules can
include the Model RXT transfer switch, RXT combined
interface/load
management
board,
automatic
paralleling module (APM), programmable interface
module (PIM), and/or the load shed kit for the RDT or
RXT transfer switch.
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.
PWR and COM Connections
For the PWR and COM connections, the cable size and
maximum cable length depends on the number of
modules connected. See Figure 1-23.
D
For short cable runs shown in the first two rows of
Figure 1-23, use one pair in the two-pair
communication cable for the A and B connections,
and use the second pair for the PWR and COM
connections.
D
For the longer cable runs shown in the last two rows of
Figure 1-23, use 12 or 14 AWG cable for PWR and
COM, and use the 20 AWG communication cable
specified above for the A and B connections only. In
this case, single-pair communication cable such as
Belden #8762 can be used for the A and B
connections.
1.10.3 System Connections with
Accessory Modules
See Figure 1-24 through Figure 1-28 for connection
options to RBUS accessory modules. Note the cable
shield connections shown in Figure 1-24.
Note:
Refer to the installation instructions provided with
the automatic paralleling module (APM) for
RBUS connections to the APM.
The maximum cable length depends on the number of
RBUS modules connected. See Figure 1-23 for the
maximum cable lengths with 1, to 4 modules per cable
run.
Note:
A model RXT transfer switch with combined
interface/load management board acts as two
RBUS modules: one RXT transfer switch and
one load management device.
Power Relay Modules are not RBUS modules and do
not add to the number of modules in Figure 1-23.
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