5-11
5-2 Speed Control
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
5
Basic Control Mode
Speed Command Acceleration/Deceleration Setting Function (Pn312, Pn313, Pn314)
With a step speed command, you can change the speed command based on this setting to
reduce the shock caused by change in acceleration.
Soft Start Acceleration Time (Pn312), Soft Start Deceleration Time (Pn313)
If a step speed command is input, set in Soft Start Acceleration Time (Pn312) the time needed
for the speed command to reach 1,000 r/min. Also set in Soft Start Deceleration Time (Pn313)
the time needed for the speed command to reach 0 r/min from 1,000 r/min.
Soft start acceleration time [ms] = Vc/1,000 × Pn312 × 1 ms
Soft start deceleration time [ms] = Vc/1,000 × Pn313 × 1 ms
S-curve Acceleration/Deceleration Time Setting (Pn314)
Set the S-curve time in the time width centered on the inflection points in acceleration/deceleration relative to the
acceleration or deceleration time set in Soft Start Acceleration Time (Pn312) or Soft Start Deceleration Time (Pn313).
ta = Vc/1,000 × Pn312 × 1 ms
td = Vc/1,000 × Pn313 × 1 ms
ts = Pn314 × 1 ms
Set an appropriate time so that ta > ts and td > ts are satisfied.
Parameter
number
Parameter
name
Explanation
Setting
range
Unit
Pn312
Soft Start
Acceleration Time
Set the acceleration time for acceleration process
with respect to the speed command input.
0 to 10000
ms/(1,000 r/
min)
Pn313
Soft Start
Deceleration Time
Set the deceleration processing deceleration
time for speed command inputs.
0 to 10000
ms/(1,000 r/
min)
Pn314
S-curve Acceleration/
Deceleration Time Setting
Set the S-curve acceleration/
deceleration time.
0 to 1000 ms
1000 r/min
Pn312×1 ms
Pn313×1 ms
A speed command that is input in steps
A speed command after the
acceleration/deceleration processing
Speed [r/min]
Time
ta
A speed command after the
acceleration/deceleration processing
Speed [r/min]
Target speed
(Vc)
Time
td
ts ts
ts ts
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