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WIRING
2.6.1 Breaker/magnetic contactor for 12-pulse rectifier power supply
For connecting the power distribution control equipment to the input side of the 12-pulse rectifier power transformer (no
voltage drop at the 12-pulse rectifier power transformer)
MCCB
For connecting the power distribution control equipment to the output side of the 12-pulse rectifier power transformer
(voltage drops at the 12-pulse rectifier power transformer)
12-pulse rectifier power
transformer
Refer to the following table to prepare appropriate peripheral devices.
Motor output
Applicable converter
*1
model
[kW]
315
FR-CC2-H315 kW
355
FR-CC2-H355 kW
400
FR-CC2-H400 kW
450
FR-CC2-H450 kW
500
FR-CC2-H500 kW
560
FR-CC2-H560 kW
630
FR-CC2-H630 kW
*1
Assumes the use of a Mitsubishi 4-pole standard motor with the power supply of 400 V AC 50 Hz.
*2
Select an MCCB according to the power supply capacity.
Install one MCCB per converter circuit in the converter unit.
For the use in the United States or Canada, provide the appropriate UL and cUL listed fuse that is suitable for branch circuit
protection. (Refer to page 30)
*3
The magnetic contactor is selected based on the AC-1 class. The electrical durability of magnetic contactor is 500,000 times. When
the magnetic contactor is used for emergency stops during motor driving, the electrical durability is 25 times.
When using an MC for emergency stop during driving the motor, select the MC with JEM1038-AC-3 class rated current for the
converter unit input current. When providing an MC on the inverter output side for switching to commercial power supply during
general-purpose motor operation, select the MC with JEM1038-AC-3 class rated current for the rated motor current.
CAUTION
When the converter unit capacity is larger than the motor capacity, select an MCCB and an MC (magnetic contactor)
according to the converter unit model, and select cables and reactors according to the motor output.
When the breaker on the converter unit's input side trips, check for the wiring fault (short circuit), damage to internal
parts of the inverter or the converter unit, etc. The cause of the trip must be identified and removed before turning ON
the power of the breaker.
18
12-pulse rectifier power
transformer
MC
MCCB
MC
MCCB
MC
Rated input current for one
circuit
406 A
454 A
512 A
576 A
640 A
728 A
806 A
DC reactor
Inrush current
R/L1
limit circuit
S/L2
T/L3
R2/L12
S2/L22
T2/L32
DC reactor
Inrush current
R/L1
limit circuit
S/L2
T/L3
R2/L12
S2/L22
T2/L32
Molded case circuit
*2
breaker (MCCB)
(NF type)
500 A
600 A
600 A
700 A
800 A
900 A
1000 A
P/+
N/-
P/+
N/-
*3
Magnetic contactor (MC)
on converter unit's input
side
S-N400
S-N400
S-N600
S-N600
S-N600
S-N800
S-N800
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