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.
[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 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 6.33.2.
MC
Depression
transformer
200V
MC
Surge killer
Adjustment range
:Disabled
:Enabled (braking resistance
overload detect)
:Enabled (braking resistance
overload not detect)
~ Ω
~ kW
E-39
An external braking resistor (optional)
PBR
TH - Ry
PA/+
PB
R/L1
U/T1
V/T2
S/L2
W/T3
T/L3
F
Inverter
FLB
R
FLC
CC
FLA
E6581528
Motor
IM
Forward run/stop
Reverse run/stop
5
Example of setting
Any value
Any value