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1.4 Relay Connections to an RXT
Combined Interface/Load
Management Board
This section applies to the RXT ATS equipped with the
combined interface/load management board.
For
models RDT ATS and RXT ATS equipped with the load
shed kit, go to Section 1.3.
See Figure 2 for cable specifications.
Note:
See the RXT Operation and Installation Manual
for load priority and load management operation
information.
Load management priorities are determined by the
control relay output connections to the RXT
interface/load management board. Typically, Load A is
added first and shed last.
1. Disconnect power to the transfer switch.
2. If the combined interface/load management board
is not already connected to the generator set,
follow the instructions in TP-6807, RXT ATS
Operation and Installation Manual, to connect the
interface board to the generator set controller and
current transformer.
3. Connect customer-supplied leads to the control
relay output terminals on the combined
interface/load management board. See Figure 5
and Figure 6.
4. See Figure 7 for the coil connection screws on the
relay. Connect the control leads from the RXT
combined interface/load management board to the
relay coil using ring terminals X-283-2.
5. See Figure 6 and Figure 8 for source and load
connection points on the relay.
a. Connect the line side of the relay to the source
power circuit as shown in Figure 6.
b. Connect the load side of the relay to the
non-essential load circuits as shown in
Figure 6.
6. Connect 120 VAC power to connections AC1 and N
on interface board connection TB2 as shown in
Figure 6.
Note:
The AC power supply circuit must be
protected by an appropriately sized fuse or
circuit breaker.
7. Connect the load side of the relay to the
non-essential load circuits. Two (2) 120 VAC loads
(shed simultaneously) or a single 240 VAC load
can be wired to each relay.
8. For all other load control connection instructions,
see the Operation/Installation Manual provided
with the RXT automatic transfer switch.
9. Proceed to Section 1.5.
Relay *
Interface Board TB2 Connection
Load A
A and N
Load B
B and N
Load C
C and N
Load D
D and N
* Load add/shed priority is based on the order of connection to
the interface board.
Figure 5
Relay Coil Control Connections to RXT
Combined Interface/Load Management
Board
GM95546
Figure 6
Relay Connections to RXT Combined Interface/Load Management Board
