IAI America SCON-C - Manual (Page 103)

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(2) Load was not contacted (missed)
If the actuator does not still contact the load after having moved the distance specified in the “Positioning band”
field, the position complete signal will not turn ON.
Therefore, include timeout check processing in the sequence circuit on the PLC side.
 It is recommended that a zone signal be also used as a “simple ruler” to supplement the judgment of missed
load.
(3) Load moves during push & hold operation
[1] Load moves in the pushed direction
If the load moves in the pushed direction after completion of push action, the actuator will chase the load
within the positioning band.
If the current drops to below the current-limiting value set in the “Push” field of the position table while the
actuator is moving, the position complete signal will turn OFF. The position complete signal will turn ON
when the current-limiting value increases to the specified level again.
[2] Load moves in the opposite direction
(Actuator is pushed back by the strong reactive force of the load)
If the actuator is pushed back after completion of push action because the reactive force of the load is
greater than the thrust force of the actuator, the actuator will be pushed back until its push force balances
out with the reactive force of the load.
The position complete signal will remain ON.
(Note) If the actuator is pushed back to the target position, an “out of push & hold operation range” alarm will generate.
Speed
Moving distance
Target position
Positioning band
(maximum push distance)
The position complete signal will not turn
ON if the load has not been contacted.
Speed
Moving distance
Target position
Completion of push action
is recognized here.
If the load moves in the pushed
direction, the actuator will chase
it within the positioning band.
Positioning band
(maximum push distance)
Speed
Moving distance
Target position
Completion of push action
is recognized here.
Positioning band
(maximum push distance)