Toshiba VF-PS1 Instruction Manual page 103

c) Capacities of 400V-250kW or more
* 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.
[Parameter setting]
Title Function
 Dynamic braking selection
* 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.
MC
Depression
transformer
2:1
MC
Surge killer
Adjustment range
:Disabled
:Enabled (braking resistance
overload detect)
:Select (braking resistance overload
not detect)
E-37
TH - Ry An external braking resistor (optional)
PBR
PA PB
Dynamic braking unit (optional)
PB7
PA/+ PC/-
R/L1 U/T1
V/T2
S/L2
T/L3 W/T3
F
Inverter
FLB
R
FLC CC
FLA
E6581386
Motor
IM
Forward run/stop
Reverse run/stop
5
Example of setting
