Toshiba VF-S15 Instruction Manual page 179

1) Connecting an external braking resistor (optional)
Separate-optional resistor (with thermal fuse)
Main circuits
P ower 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
Note 2: As a last resort to prevent fire, be sure to connect a thermal relay (THR). Although the inverter has a
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MCCB
PA/+ PB
U/T1
R/L1
V/T2
S/L2
W/T3
T/L3
Inverter
MCCB
Main circuits
Power supply
Step-down
transformer
2:1
Fuse
TC
Power supply
an MC. A step-down transformer is needed for every 500V-class inverter, but not for any 240V-class
inverter.
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)
appropriately to the capacity (wattage) of the braking resistor.
Braking resistor (optio nal)
PBR
Motor
IM
Connecting thermal relays and an external braking resistor
TH-R
MC
PA/+ PB
R/L1
S/L2
T/L3
Inverter
MC
FLB
Surge
suppressor
FLC
FLA
F-67
Braking resistor (optional)
PBR
Motor
U/T1
IM
V/T2
W/T3
F
Forward
R Reverse
CC
E6581611
6