2-44
Servo-ON/OFF Action While the Motor Is in Motion
Remarks
Timing at emergency stop or trip. Do not repeat this sequence.
Caution
*
1. t1 will be a shorter time of either the setup value of Pr4.38 “Mechanical brake action
at running setup” or elapsing time for the motor speed to fall below
Pr4.39 “Brake re-
lease speed setup”
.
*
2. Even though the SRV-ON signal is turned on again during the motor deceleration,
Servo-ON will not be activated until the motor stops.
*
3. For the action of dynamic brake at alarm occurrence, refer to an explanation of
Pr5.06, “Sequence at Servo-OFF” as well.
*
4. Servo-ON will not be activated until the motor speed falls below approx. 30 r/min.
*
5.
For the motor energization during deceleration at Servo-OFF depends on the setup value
of Pr.5.08, “Sequence at Servo-OFF”.
*
6. Servo ON status output (SRV-ST) is a signal indicating that it has received the Servo-
On input; please note that it is not an indication showing command input is possible.
Related page
• P.2-47 “Dynamic brake”
2
Preparation
9.
Timing Chart
Servo-ON/OFF
input coupler
OFF
input coupler
OFF
input coupler ON
engaged *3 released
not-energized
engaged *3
*4
not-energized *5energized
Output Tr OFF
Output Tr.ON
engaged (OFF)released (ON)
No servo-ON until the motor speed
falls below approx. 30 r/min.
1 to 5 ms
approx.60 ms
approx.23 ms
Setup value of
Pr4.38
Setup value of
Pr4.38
when setup
value of Pr4.38
is shorter
approx.4 ms
approx.30 r/min
Dynamic brake
Motor energization
Motor rotational
speed
Motor rotational speed
servo validated
External brake
release output
(BRK-OFF)
Servo-ON input
(SRV-ON)
when time to fall
below value of
Pr4.39 is shorter
Motor rotational
speed
Setup value of
Pr4.39
Motor rotational
speed
Setup value of
Pr4.39
at Servo-ON at Servo-OFF
t1 *1
t1 *1
Output Tr OFF
Servo on status
output(SRV-ST)
*
6
Output Tr OFF Output Tr OFF
Output Tr.ON
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