Toshiba TOSVERT VF-MB1 Instruction Manual page 164

1) Connecting an external braking resistor (optional)
Separate-optional resistor (with thermal fuse)
Three-phase main circuits
Power supply
6
Note 1: A TC (Trip coil) is connected, as shown in this figure, when an MCCB with a trip coil is used instead
Note 2: As a last resort to prevent fire, be sure to connect a thermal relay (THR). Although the inverter has a
MCCB
PBe PB
U/T1
R/L1
V/T2
S/L2
W/T3
T/L3
Inverter
Three-phase main circuits
Power supply
Power supply
of 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)
appropriate to the capacity (wattage) of the braking resistor.
Braking resistor (optional)
PBR
Motor
IM
Connecting thermal relays and an external braking resistor
MCCB
MC
Step-down
transformer
2:1
MC
Fuse
TC
F-44
TH-R Braking resistor (optional)
PBR
PBe PB
U/T1
R/L1
V/T2
S/L2
W/T3
T/L3
Inverter
F
FLB
R
Surge
suppressor
CC
FLC
FLA
E6581697
Motor
IM
Forward
Reverse