IAI America SCON-C - Manual (Page 203)

185
Appendix
 Push speed
This parameter defines the push speed to be applied after the actuator reaches the target position in push & hold
operation.
Before the shipment, this parameter has been set to the default value selected in accordance with the
characteristics of the actuator.
Set an appropriate speed in parameter No. 34 by considering the material and shape of the load, and so on.
Take note that maximum speed is limited to “20 [mm/sec]” even on high-speed types and that you should use
the actuator at push speeds not exceeding this level.
Caution: It is recommended that you set the push speed to 5 [mm/s] or above to minimize the negative effect
of push force variation.
 Push completion judgment time
This parameter is used as a condition for determining that the load was contacted and the push & hold operation
has completed.
As for the specific method of judgment, the push & hold operation is deemed to have completed if the current-
limiting value set in the position table has been retained for the time set by parameter No. 6.
Set an optimal time matching the current-limiting value, by considering the material and shape of the load, and
so on.
The minimum setting unit is “1 [msec],” while the maximum value is “9999 [msec].” The factory setting is “255
[msec].”
(Note) The chart below explains how completion of push & hold operation is determined if the load shifted
during the judgment and the current has changed as a result, based on a judgment time of 255 msec.
If the motor current remains at or above the push current for 200 msec and then drops below this level for 20
msec, the count will decrease by 20. When the push current is reached again thereafter, counting will start from
180. If the motor current remains at or above the push current for 75 msec, the count will increase to 255 and
thus push & hold operation will be deemed to have completed.
In total, 295 msec was required for the judgment.
Speed Push speed
Load
Positioning band
Push current
Starting position Target position Counting starts.
The count increases to 200.
The count decreases to 180.
The count increases to 255.
Push & hold operation is
deemed to have completed.