Toshiba VF-PS1 Instruction Manual page 102

b) When a using braking resistor without thermal fuse
Three-phase
main circuit
power supply
Power supply
Note 1: Connection when using an MCCB with a top coil instead of an MC.
Note 2: A depression transformer is required for 400V models but not for 200V models.
5
[Parameter setting]
Title



(When the thermal braking resistor option is not used, be sure to set the parameters  and  properly
for overload protection.)
* 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.
- Warning -
In the above circuit, the MC in the main circuit is turned off if an inverter's protective function is activated, and
consequently no trip message is displayed. The inverter recovers from a trip if it is turned off. So, check the trip
history record after turning off the inverter and then on again. ⇒ Refer to Section 8.2.1.
To prevent a trip condition from being cleared by turning off the power and then on again, change the setting of the
inverter trip retention selection parameter . ⇒ Refer to Section 6.26.2.
* If no power supply is provided
for the control circuit
MCCB
Depression
transformer
2:1
[Note 2]
[Note 1] Fuse
TC
Function
Dynamic braking selection
Dynamic braking resistance
Allowable continuous braking
resistance
TH - Ry
MC PA/+
R/L1
S/L2
T/L3
Inverter
FLB
MC
Surge killer
FLC
FLA
Adjustment range
:Disabled
:Enabled (braking resistance
overload detect)
:Select (braking resistance overload
not detect)
~ Ω
~ kW
E-36
E6581386
An external braking resistor (optional)
PBR
PB
Motor
U/T1
V/T2
IM
W/T3
F
Forward run/stop
Reverse run/stop
R
CC
Example of setting

Any value
Any value