Toshiba Tosvert VF-AS1 Instruction Manual page 109

c) Capacities of 400V-200kW and above
* If no power supply is
provided for the control circuit
MCCB
Three-phase
main circuit
power supply
Depression
transformer
2:1
[Note 1] Fuse
TC
Power supply
Note 1: Connection when using an MCCB with a top coil instead of an MC.
[Parameter setting]
Title Function
 Dynamic braking selection
* As a last resort to prevent fire, be sure to connect a thermal relay (Be sure to use bimetals method ). 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 6.33.2.
TH - Ry
PA
MC BU+
R/L1
S/L2
T/L3
Inverter
MC FLB
Surge killer
FLC
FLA
Adjustment range
:Disabled
:Enabled (braking resistance
overload detect)
:Enabled (braking resistance
overload not detect)
E-39
E6581442
An external braking resistor (optional)
PBR
PB
Dynamic braking unit (optional)
PB7
BU-
Motor
U/T1
V/T2 IM
W/T3
F
Forward run/stop
Reverse run/stop
R
CC
Setting value

5