Rockwell Automation 8720MC 8720MC Regenerative Power Supply User Manual - Manual (Page 64)

If a totally external resistor network is used as shown in figure
4.10, the calculated wattage, [W] = 17,000
x C farads, is divided in
half to size the precharge and discharge resistors.
Parameter F.015 should be set to the sum of the wattage for both
resistors.
Installing Circuit Breaker - 8720MC-RPS190
To protect AC input power, install a circuit breaker with
supplemental contact (CB) in the AC input power line. Refer to
Figures 4.6 to 4.8 for wiring. The rated ampacities of the circuit
breakers are as follows:
For Model 8720MC-RPS190BM and 8720MC-RPS190BS units:
350 Amps
The following are the recommended circuit breakers with
supplemental contact.
For Model 8720MC-RPS190BM and 8720MC-RPS190BS units:
Fuji Electric - BU-KSB3350LW
Westinghouse - KDB3350
or equivalent
Because supplemental contact of this circuit breaker does not
conform with load of 5mA, relay with less than 5mA should be
used for connection when a supplemental contact is connected with
sequence input PWR.
Be sure to provide required quantity of circuit breakers with
supplemental contact (CB) for all units connected in parallel (see
Figures 4.6 and 4.7).
Installing ACL Unit (Reactor Assembly) - 8720MC-RPS190
ATTENTION : During operation of the 8720MC-RPS
Regenerative Power Supply, the reactor is at a high
temperature. Do not touch the reactor during
operation or immediately after the unit has been
turned OFF. Failure to observe this precaution could
result in bodily injury.
ATTENTION: During operation of the 8720MC-RPS
Regenerative Power Supply, the reactor operates at a
high temperature. Install the reactor in a location
where high temperature does not present a problem.
The 8720MC-RPS Regenerative Power Supply boosts up and
controls the DC bus voltage, by utilizing the magnetic
characteristics of reactor. Therefore, reactors are required for the
8720MC-RPS Regenerative Power Supply.
Install a single-phase type reactor to each of L
1
-phase, L
2
-phase and
L
3
-phase. Do not use three-phase AC reactors, since this will cause
unwanted coupling between the phases.
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4-26 Wiring
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