Vibration occurs when the actuator is stopped, The actuator overshoots when decelerated to a stop, The home and target positions sometimes shift – IAI America RCP2-CF User Manual
Page 154: The speed is slow during push & hold operation
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Home return ends in the middle in a vertical application.
Cause: [1] The load exceeds the rating.
[2] The ball screw is receiving torsional stress due to the affixing method of the actuator, tightening
of bolts only on one side, etc.
[3] The slide resistance of the actuator itself is large.
Action: [1] Increase the value set in parameter No. 13 (Current-limiting value during home return).
Increasing this value increases the home return torque. As a guide, however, set the upper limit
to 100% for the RXA type and 75% for all other types.
[2] Loosen the fixing bolts and check if the slider moves smoothly.
If the slider moves smoothly, review the affixing method and bolt tightening condition.
[3] If the slide resistance of the actuator itself is large, please contact IAI.
Noise occurs during downward movements in a vertical application.
Cause: The load exceeds the rating.
Action: [1] Decrease the speed.
[2] Decrease the value set in the parameter No. 7 (Servo gain number). Do not decrease the
parameter setting below “3.”
Vibration occurs when the actuator is stopped.
Cause: The slider is receiving an external force.
Action: If the external force cannot be removed, increase the value set in parameter No. 12 (Current-limiting
value at standstill during positioning).
Increasing this value will cause the holding torque at standstill to increase, so do not increase the
parameter setting above 70%.
The actuator overshoots when decelerated to a stop.
Cause: The load inertia is high due to an inappropriate balance of load and deceleration.
Action: Decrease the acceleration/deceleration setting.
The home and target positions sometimes shift.
Cause: [1] The encoder waveform is disturbed by the effect of noise.
[2] In the case of a rod-type actuator, the non-rotation accuracy increased due to application of
rotating moment to the rod.
Action: [1] Check if the grounding is implemented correctly. Also check for any equipment being a potential
noise source.
[2] The actuator may have to be replaced in some cases. Please contact IAI.
The speed is slow during push & hold operation.
Cause: The set current-limiting value is low with respect to the load and slide resistance.
Action: Increase the current-limiting value for push & hold operation.