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 bu t 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 th e 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 u se bimetals method)"or a
thermostat. Although the inverter has a means of preventing overload to protect the br aking 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 inverte r's protective function is activated, and
consequently no trip message is displayed. The inverter recovers from a trip i f it is turned off. So, check the trip
history record after turning off the inverter and then on again. Refer to Secti on 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 6.3 3.2.