Instruction manual

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5. PARAMETERS
5.3.2 List of details
Control Mode
No. Symbol Name and Function
Initial
Value
Unit
Setting
Range
Position Speed Torque
PC01 STA Acceleration time constant
Used to set the acceleration time required to reach the rated
speed from 0r/min in response to the analog speed command and
internal speed commands 1 to 7.
Time
Parameter
No. PC02 setting
Parameter
No. PC01 setting
Zero
speed
Rated
speed
Speed
If the preset speed command is
lower than the rated speed,
acceleration/deceleration time
will be shorter.
For example for the servo motor of 3000r/min rated speed, set
3000 (3s) to increase speed from 0r/min to 1000r/min in 1 second.
0ms 0
to
50000
PC02 STB Deceleration time constant
Used to set the deceleration time required to reach 0r/min from
the rated speed in response to the analog speed command and
internal speed commands 1 to 7.
0ms 0
to
50000
PC03 STC S-pattern acceleration/deceleration time constant
Used to smooth start/stop of the servo motor.
Set the time of the arc part for S-pattern acceleration/deceleration.
STA: Acceleration time constant (parameter No. PC01)
STB: Deceleration time constant (parameter No. PC02)
STC: S-pattern acceleration/deceleration time constant
(parameter No. PC03)
Speed command
Servo motor
Speed
0r/min
STC
STA STC
STC STB
STC
Time
Long setting of STA (acceleration time constant) or STB (deceleration time
constant) may produce an error in the time of the arc part for the setting of
the S-pattern acceleration/deceleration time constant.
The upper limit value of the actual arc part time is limited by
At the setting of STA 20000, STB 5000 and STC 200,
the actual arc part times are as follows:
for acceleration or by for deceleration.
(Example)
During acceleration: 100[ms]
2000000
20000
100[ms] 200[ms].
Limited to 100[ms] since
During deceleration: 200[ms]
2000000
5000
400[ms] 200[ms].
200[ms] as set since
2000000
STA
2000000
STB
0ms 0
to
1000