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6-15
6-5 Brake Interlock
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
6
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 operations 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. If a Servo-ON is
commanded during motor rotation, the Command warning (Warning No. 95) occurs. The Servo-ON command is
ignored.
*2. The dynamic brake operation when the servo is OFF depends on Stop Selection with Servo OFF (Pn506).
*3. The Brake Interlock output (BKIR) signal is output when the OR condition is met by a release request command from
the Servo control and from the MECHATROLINK-II. In the above example, the MECHATROLINK-II makes no
release request. The BKIR signal is assigned to the general-purpose output (CN1).
*4. The mark t1 refers to the period until the value becomes lower than the set value on the Brake Timing during
Operation (Pn438) or the Brake Release Speed Setting (Pn439), whichever is shorter.
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 relay
ON
OFF
Motor power supply
ON
OFF
Brake release request
from servo control
*3
ON
OFF
*1
1 to 5 ms
Approx. 4 ms
Pn438
Approx. 60 ms
Servo OFF
Servo OFF
Servo ON
*1
DB engaged
DB engaged
*2
DB released
Power supply
No power supply
No power supply
*2
Release request
Brake held
t1
*4
Motor rotation speed
Servo ON enabled
Approx.
+
30 r/min
Value set on Pn439
Approx.
−
30 r/min
Release request
Brake held
Value set on Pn439
BKIR
When the Pn438
setting is early
Brake held
t1
*4
Pn439
When the Pn439
setting is early