Using A Braking Unit And Braking Resistor Unit - YASKAWA Varispeed G7 Series Instruction Manual

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Using a Braking Unit and Braking Resistor Unit

When using a Braking Unit and Braking Resistor Unit, create a sequence to detect overheating of the braking
resistor and cut off the power supply to the Inverter.
CIMR-G7A2018, -G7A2022 (200 V Class Inverters of 18.5 kW, 22 kW)
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,
200 to 240 V
at 50/60 Hz
2MCCB
MC MB THRX
Braking Resistor Unit
(overheat contacts)
Forward Run/Stop Forward Run/Stop
* 1. Remove the short-circuit bar (standard equipment) from between
* 2. Disable the stall prevention during deceleration (set constant L3-04 to 0) when using a Braking Resistor Unit. If this user constant is not
changed to disable stall prevention, the system may not stop in the set deceleration time.
DC Reactor to
improve input
power factor
(Optional)
Short-circuit bar
R/L1
S/L2
T/L3
Inverter
ON
MC
OFF
MC
SA
THRX
1 2
SA
TRX
SA
TRX
MA MC
Fault contacts
Forward Run Command (forward run when ON)
Reverse Run/Stop
Reverse Run Command (reverse run when ON)
Braking Unit
External fault
Fig 10.14
Braking Unit
Braking Resistor Unit
(Optional)
(Optional)
Level
detector
Braking Resistor overheating contacts
(Thermal protector trip contacts)
Motor
U/T1
V/T2
W/T3
Ground to 100 Ω max.
+ +
1 and 2 before you connect a DC Reactor (optional).
Wiring Examples
*2
10
25
10-