6
6-21
6-6 Brake Interlock
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
Applied Functions
Servo ON/OFF Operation Timings <When Motor Is Rotating>
Based on these operation timings, regenerative energy is produced if the motor rotation stops
abnormally.
Accordingly, repeated operation cannot be performed. Provide a wait time of at least 10
minutes for the motor to cool down.
*1. The servo does not turn ON until the motor rotation speed drops to approx. 30 r/min or below.
*2. The dynamic brake operation when the servo is OFF depends on Stop Selection with Servo OFF (Pn506).
*3. The brake interlock (BKIR) signal is output upon a release request from servo control. The BKIR signal is assigned
to the general-purpose output (CN1).
*4. "t1" is either the time set for the Brake Timing During Operation (Pn438), or the time needed for the motor speed to
drop to speed set in Brake Release Speed Setting (Pn439) or below, whichever comes first.
Note:Even when the servo ON input is turned ON again while the motor is decelerating, the system does not enter the
servo ON state until the motor stops.
Operation command (RUN)
ON
OFF
Dynamic brake
Released
Engaged
Motor power supply
ON
OFF
Brake release request
from servo control *3
ON
OFF
Approx. 2 ms 1 to 5 ms
Approx. 4 ms
Pn438
Approx. 60 ms
Servo OFF Servo OFF*1 Servo ON
DB engaged DB Released
*2
DB Released
Power supply
No power supply
No power supply
Release request
Release request
Brake held
Brake held
t1
*4
Motor rotation speed
Servo ON enabled
Approx. +30 r/min
Pn439 set value
Pn439 set value
Approx. −30 r/min
When the Pn438 set value is early
When the Pn439 set value is early
BKIR
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