Rockwell Automation 8720MC 8720MC Regenerative Power Supply User Manual - Manual (Page 65)

4-27 Wiring
The following inductance of the reactor must be maintained in a
high frequency as 10 to 20 kHz. Note that use of a reactor for
commercial power supply may 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 vibration of reactor
inductance. To make the current difference between the connected
units as small as possible, use reactors having a vibration of no
more than +/-2.5%.
The following are the designated reactors. These reactors are
integrated for three phases consisting of three single phase
reactors. Depending on the motor capacity, single unit of the
designated reactor is used or two units of reactors connected in
parallel are used as shown below. When selected reactors are
installed, set their capacity to the parameter F.013.
One (1) Model 8720MC-LR10-100B (800 micro-henry):
For Model 8720MC-RPS190BM and 8720MC-RPS190BS that
are used at 100 Amps or less (capacity of applicable motor is 65
kW or less)
Two (2) Model 8720MC-LR10-100B (800 micro-henry)
connected in parallel:
For Model 8720MC-RPS190BM and 8720MC-RPS190BS that
are used at 190 Amps or less (capacity of applicable motor is
125 kW or less)
Cooling fan and thermoswitch are mounted on the ACL unit. The
thermo switch opens at about 150 degree C (302 degree F) and
produces a reactor fan fault signal.
The reactor should operate in an ambient temperature of 50 degree
C (122 degree F) or lower. If it is not avoidable to use a reactor
above 50 degree C (122 degree F), decrease current 1% for every 1
degree C above 50 degree C.
Select temperature rating of 105 degree C (221 degree F) or higher
for the wire to connect Model 8720MC-LR10-100B reactors.
Installing Fuses - 8720MC-RPS190
Install a fuse on the AC incoming line. The following is the
recommended fuse for the single unit.
FERRAZ SHAWMUT or equivalent (Class J Fuse)
Rated current of the fuse for Model 8720MC-RPS190 is 350
Amps.
Also, as a measure against ground fault, install a fuse to protect the
DC bus. The recommended fuses are as follows:
For Model 8720MC-RPS190BM and 8720MC-RPS190BS
units: FERRAZ SHAWMUT, A130URD71LLI0350