SMC Networks LECSN-T Series

5. PARAMETERS
5 - 92
No./
symbol/name
Setting
digit
Function
Initial
value
[unit]
Network
ECT
EIP
PNT
PT51
STC
S-pattern
acceleration/
deceleration
time constant
This parameter is used to smooth the start/stop of the servo motor or linear servo
motor.
Set the time of the arc part for S-pattern acceleration/deceleration.
Setting "0" will make it linear acceleration/deceleration.
Acceleration time
constant
Servo motor
speed
0 [r/min]
Deceleration time
constant
Ta
Ta + STC Tb
Tb + STC
Rated speed
Preset speed
Ta: Time until preset
speed is reached
Tb: Time until stop
Long setting of STA (acceleration time constant) or STB (deceleration time
constant) may produce deviation in the set time of the arc part for the S-pattern
acceleration/deceleration time constant. The setting will be disabled at home
position return. To enable the parameter values, cycle the power after setting.
Profile mode
When a value exceeding 1000 ms is set in other than the
profile velocity mode (pv), the parameter value will be clamped
to 1000 ms.
Specify STA (acceleration time constant) and STB
(deceleration time constant) with "Profile acceleration (PNU:
24707, Sub: 0)" and "Profile deceleration (PNU: 24708, Sub:
0)".
This function will be enabled in the profile position mode (pp)
and profile velocity mode (pv).
Point table method
When a value exceeding 1000 ms is set, the parameter value
will be clamped to 1000 ms.
Specify STA (acceleration time constant) and STB
(deceleration time constant) with the point table.
The upper limit value of the actual arc part time is limited by
2000000
STA
for acceleration or by
2000000
STB
for deceleration.
(Example) When STA = 20000, STB = 5000 and STC = 200, the actual arc part
times are as follows.
At acceleration: 100 ms
2000000
20000
= 100 [ms] < 200 [ms]
Therefore, it will be limited to 100 [ms].
At deceleration: 200 ms
2000000
5000
= 400 [ms] > 200 [ms]
Therefore, it will be 200 [ms] as you set.
Setting range: 0 to 5000
0
[ms]