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E6581301
E-38
5
b) When a using braking resistor without thermal fuse
Fuse
IM
Motor
TC
MC
R/L1
S/L2
T/L3
PA/+
FLB
PB
FLC
FLA
An external braking resistor (optional)
PBR
[Note 1]
MC
MCCB
Three-phase
main circuit
power supply
Power supply
TH - Ry
Surge killer
* If no power supply is provided
for the control circuit
Inverter
Depression
transformer
2:1
[Note 2]
U/T1
V/T2
W/T3
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 Adjustment range Setting value
RD Dynamic braking selection
:Disabled
~:Enabled
RDT Dynamic braking resistance ~ Any value
RDER
Dynamic braking resistor
continuous capacity
~ kW Any value
(When the thermal braking resistor option is not used, be sure to set the parameters RDT and RDER properly
for overload protection.)
* As a last resort to prevent fire, be sure to connect a thermal relay (Be sure to use bimetals method)or a
thermostat. Although the inverter has a means of preventing overload 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 H. Refer to Section 6.33.2.