Using A Braking Unit And Three Braking Resistor Units In Parallel - YASKAWA Varispeed G7 Series Instruction Manual

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Using a Braking Unit and Three Braking Resistor Units in Parallel

This example shows wiring for using three Braking Resistor Units in parallel.
A sequence is required to turn OFF the
power supply for the thermal protector trip
contacts of the Braking Resistor Unit.
Ground Fault Interrupter or Molded-case Circuit Breaker
3-phase power
supply, 380 to
480 V at 50/60 Hz
2MCCB ON
MC MB THRX OFF
Braking Resistor Unit
thermal relay trip contacts
1 2
MA MC
Forward Run/Stop
Reverse Run/Stop
External fault
* Disable the stall prevention during deceleration (set constant L3-04 to 0) when using a Brak-
ing Resistor Unit. If this user constant is not changed to disable stall prevention, the system
may not stop in the set deceleration time.
R/L1
Inverter
S/L2
T/L3
Voltage
setting
MC
MC
SA
THRX
SA
TRX
SA
TRX
Fault contacts
Forward Run Com-
mand (forward run
when ON)
Reverse Run Com-
mand (reverse run
Braking Unit
when ON)
Fig 10.16
Thermal
protector
Braking
Resistor
Unit
Braking Unit
Thermal switch
Motor
U/T1
V/T2
W/T3
Cooling fan
Ground to 10 Ω max.
Fault contact outputs
Wiring Examples
Thermal Thermal
protector protector
Braking Braking
Resistor Resistor
Unit Unit
10
27
10-