Install The Main Magnetic Contactors; Install Line Reactors - Allen-Bradley 8720MC-RPS065 User Manual

Install the Main Magnetic Contactors

The 8720MC-RPS unit uses a magnetic contactor for turning the main power
supply ON and OFF. This applies to single units and units connected in
parallel. After the RUN sequence signal is entered and the precharge operation
is completed, the main magnetic contactor turns ON.
Conversely, when the RUN sequence signal is turned OFF, or when a fault
occurs, the main magnetic contactor turns OFF, and the discharge operation
begins. Refer to Contactor Specifications
magnetic contactors.

Install Line Reactors

The 8720MC-RPS unit boosts up and controls the DC-bus voltage by
utilizing the magnetic characteristics of a line reactor.
ATTENTION: Due to the high operating temperature of the line reactor,
make sure the unit has adequate ventilation inside the enclosure.
BURN HAZARD: During operation of the 8720MC-RPS unit the line reactor
becomes extremely hot. Do not touch the line reactor during operation or
immediately after the unit has been turned OFF. Failure to observe this
precaution could result in bodily injury.
Install a single-phase type line reactor to each of L1-phase, L2-phase, and L3-
phase. Do not use three-phase AC line reactors, because this causes unwanted
coupling between the phases.
The following inductance of the line reactor must be maintained in a high
frequency as 10 to 20 kHz. The use of a line reactor for commercial power
supply does not maintain the required inductance, resulting in increased heat
generation or saturation due to iron loss.
When multiple units are connected in parallel, a current unbalance between
the units is produced due to variation of reactor inductance. To make the
current difference between the connected units as small as possible, use line
reactors having a variation of no more than ±2.5%.
These line reactors are integrated for three phases consisting of three single-
phase reactors. When selected reactors are installed, set their capacity to the
parameter F.013.
Rockwell Automation Publication 8720MC-RM001K-EN-P - September 2018
Connect the 8720MC-RPS Unit
on page 17 for recommended
Chapter 5
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