Toshiba TOSVERT VF-AS1 Instruction Manual page 103

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b) When a using braking resistor without thermal fuse
* If no power supply is provided
for the control circuit
MCCB
Three-phase
main circuit
power supply
[Note 1]
Fuse
TC
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.
[Parameter setting]
Title
Function
Dynamic braking selection
Dynamic braking resistance
Allowable continuous braking
resistance
(When the thermal braking resistor option is not used, be sure to set the parameters
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
MC
Depression
transformer
2:1
[Note 2]
MC
Surge killer
Adjustment range
:Deselect
:Select (bracking resistance
overload detect)
: Select (bracking resistance
overload not detect)
~
~
. ⇒ Refer to Section 6.33.2.
E-37
An external braking resistor (optional)
PBR
TH - Ry
PA/+
PB
R/L1
U
S/L2
V
T/L3
W
F
Inverter
FLB
R
FLC
CC
FLA
kW
E6581301
Motor
IM
Forward run/stop
Reverse run/stop
5
Example of setting
Any value
Any value
and
properly

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