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26 Rockwell Automation Publication 290D-UM001A-EN-P - June 2012
Chapter 1 Product Overview
Basic Operation
Group Motor Installations for USA and Canada Markets
The ArmorStart LT Distributed Motor controllers are listed for use with each
other in group installations per NFPA 79, Electrical Standard for Industrial
Machinery and NFPA 70, the National Electrical Code. When applied according
to the group motor installation requirements, two or more motors are permitted
on a single branch circuit. Group Motor Installation has been successfully used
for many years in the USA and Canada.
Note: For additional information regarding group motor installations with the
ArmorStart LT Distributed Motor Controller, see Appendix A
.
Control Circuit
ArmorStart LT accepts a 24V DC Class 2 input power supply for switched
and unswitched power. The control voltage provides power to the inputs
(unswitched) and outputs (switched). Unswitched control voltage is used to
ensure no loss of network connectivity, sensor, or other field input status under
normal operation. The control power terminal connections are labeled A1, A2,
and A3. Switched power is identified as (+A1) (-A2). Unswitched power is
identified as (+A3) (-A2).
As an option, ArmorStart LT can be supplied with an internal power supply
(IPS) eliminating the need for an external control power. The IPS is sourced from
the line side of 3-phase power and is not impacted by the status of the local at-
motor disconnect switch.
Figure 3 - Control Circuit Wiring Diagram — Single External Power Supply