Mitsubishi Electric MR-J4-TM Instruction Manual page 215

5. PARAMETERS
No./ Setting
symbol/name digit
PT51 This parameter is used to smooth the start/stop of the servo motor or linear servo
motor.
STC
Set the time of the arc part for S-pattern acceleration/deceleration.
S-pattern
acceleration/ Setting "0" will make it linear acceleration/deceleration.
deceleration
time constant
Rated speed
Preset speed
Servo motor
speed
A long time constant set in STA ([Pr. PT49 Acceleration time constant]) or STB ([Pr.
PT50 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 setting
will be disabled at home position return.
The upper limit value of the actual arc part time is limited by
2000000
(Example) When STA = 20000, STB = 5000 and STC = 200, the actual arc part
Setting range: 0 to 5000
Acceleration time
constant
0 [r/min]
Ta
Ta + STC
In the profile mode
When a value of 1000 ms or larger is set, the parameter value will be clamped to
1000 ms. The setting will be disabled at home position return.
Specify STA ([Pr. PT49 Acceleration time constant]) and STB ([Pr. PT50
Deceleration time constant]) with "Profile acceleration (Index: 6083h)" and "Profile
deceleration (Index: 6084h)".
This function will be enabled in the profile position mode and profile velocity mode.
To enable this function, cycle the power after setting.
for acceleration or by
STA
times are as follows.
At acceleration: 100 ms
2000000
20000
Therefore, it will be limited to 100 [ms].
At deceleration: 200 ms
2000000
5000
Therefore, it will be 200 [ms] as you set.
Function
Deceleration time
constant
Tb + STC
Tb
2000000
for deceleration.
STB
= 100 [ms] < 200 [ms]
= 400 [ms] > 200 [ms]
5 - 76
Initial
value
[unit]
0
[ms]
Ta: Time until preset
speed is reached
Tb: Time until stop
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