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FOR REFERENCES ONLY
1) Connecting an external braking resistor (optional)
Separate-optional resistor (with thermal fuse)
MCCB
Three-phase main circuits
Power supply
Three-phase main circuits
Power supply
Note 1: A TC (Trip coil) is connected, as shown in this figure, when an MCCB with a trip coil is used instead
of an MC. A step-down transformer is needed for every 400V-class inverter.
Note 2: As a last resort to prevent fire, be sure to connect a thermal relay (THR). Although the inverter has a
means of preventing overload and overcurrent to protect the braking resistor, the thermal relay is
activated in case the protection function fails to work. Select and connect a thermal relay (THR)
appropriate to the capacity (wattage) of the braking resistor.
VFNC3C ENGLISH MANUAL
Braking resistor (optional)
PBR
PA/+
PB
Motor
U/T1
R/L1
V/T2
IM
S/L2
W/T3
T/L3
Inverter
Connecting thermal relays and an external braking resistor
MCCB
Step-down
transformer
2:1
Fuse
TC
Power supply
F-29
NOT SUBJECTED FOR RESALE
TH-R
Braking resistor (optional)
PBR
MC
PB
PA/+
U/T1
R/L1
S/L2
V/T2
W/T3
T/L3
Inverter
F
MC
FLB
R
Surge
suppressor
CC
FLC
FLA
6
Motor
IM
Forward
Reverse
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