Mitsubishi Electric MELSERVO MR-J2S- A Instruction Manual page 128

5. PARAMETERS
Class No. Symbol
9 SC2 Internal speed command 2
Used to set speed 2 of internal speed commands.
Internal speed limit 2
Used to set speed 2 of internal speed limits.
10 SC3 Internal speed command 3
Used to set speed 3 of internal speed commands.
Internal speed limit 3
Used to set speed 3 of internal speed limits.
Acceleration time constant
11 STA
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.
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.
Deceleration time constant
12 STB
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.
13 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.
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
2000000
STA
(Example)
During acceleration: 100[ms]
During deceleration: 200[ms]
Name and function
If the preset speed command is
lower than the rated speed,
Speed
acceleration/deceleration time
Rated
speed
Zero
speed
Parameter
No.11 setting
Speed command
0r/min
STA STC
STC
STA: Acceleration time constant (parameter No.11)
STB: Deceleration time constant (parameter No.12)
STC: S-pattern acceleration/deceleration time con-
stant (parameter No.13)
2000000
for acceleration or by
STB
At the setting of STA 20000, STB 5000 and STC 200,
the actual arc part times are as follows:
Limited to 100[ms] since
2000000
20000
200[ms] as set since
2000000
5000
will be shorter.
Time
Parameter
No.12 setting
Time
STC STB STC
for deceleration.
100[ms] 200[ms].
400[ms] 200[ms].
5 - 9
Initial Setting Control
Unit
value range mode
500 r/min
0 to
instan-
taneous
permi-
ssible
speed
1000 r/min
0 to
instan-
taneous
permi-
ssible
speed
0 ms 0
to
20000
0
0 ms 0
to
1000
S
T
S
T
S T
S T