I-3
Among the wiring equipment shown in the above table, the magnetic contactors (MC) and overload relays
(THR) are new models of the ESPER Mighty J series. When using old models of the Mighty J series, refer
to the following comparison table that shows consistency between models of the two series.
Magnetic contactor (MC)
Overload relay(THR)
Mighty J series
ESPER Mighty series
Mighty J series
ESPER Mighty series
C50J
C50A
T65J
T65A
C65J
C65A
T100J
T80A
C80J
C80A
T115J
T125A
C100J
C100A
T150J
T150A
LC1-D150
C125A
T185J
T180A
LC1-F185
C180A
LR9-F53
T220A
LC1-F225
C220A
LR9-F73
T400A
LC1-F330
C300A
LC1-F400
C400A
LC1-F630
C600A
9. 2. Installation of electromagnetic contactor
When the inverter is used without electromagnetic contactor (MC) in the primary circuit, use the
MCCB (with voltage tripping device) to make the primary circuit open when the inverter
protection circuit is in operation.
When the damping resistor/damping resistance unit is used, install the electromagnetic
contactor (MC) or fuseless circuit breaker with power tripping device in the temporary power
supply circuit of the inverter so that the power circuit becomes open by operation of the error
detection relay (EL) built in the inverter or externally installed overload relay.
■
Electromagnetic contactor in the primary circuit
If an electromagnetic contactor is installed in the power supply circuit of the inverter, it prevents
the inverter from power failure, tripping of overload relay (Th-Ry), cutout of the inverter
protection circuit after its operation, and double starting.
If the FL contact of the error detection relay built in the VF-P7 is connected with the operation
circuit of the primary electromagnetic contactor (MC), the MC is tripped when the inverter
protection circuit is actuated.
Example of electromagnetic contactor connection in primary circuit
Power
supply
MCCB
MC
VF−P7
R
S
T
U
V
W
ST
F
R
CC
Operation preparation
Forward
Reverse
IM
Moter