IAI America ACON-SE - Manual (Page 113)

103
6. T
roubleshooting
Ɣ Home return ends in mid-process in a vertical application.
Cause: [1] The loading mass 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.
Ɣ Noise occurs during downward movements in a vertical application.
Cause: The loading mass exceeds the rating.
Action: [1] Decrease the speed.
[2] Decrease the value set in parameter No. 7 (servo gain number).
Do not decrease the parameter setting below “3.”
Ɣ The actuator overshoots when decelerated to a stop.
Cause: The load inertia is high due to an inappropriate balance between load and deceleration.
Action: Decrease the acceleration/deceleration setting.
Ɣ 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.
Ɣ The actuator moves only half of the specified distance or twice.
Cause: [1] The combination of the controller and actuator is incorrect.
Since the lead length of the ball screw varies depending on the actuator type, incorrect combination
changes the moving distance and speed.
[2] IAI’s error before shipment.
Action: [1] If there are multiple actuators of different types, check them for adequacy before connecting them with
the controller by the attached seal labels, etc.
[2] Please contact IAI.
Action: Check / Change the parameters set in User Parameter No. 13 (Current Limit at Home Return).
Reference for setting is from 120% (when direction of home return is upwards) to the initial setting or 80%
(when direction of home return is downwards).
[1] Review the loading mass if this is the cause.
[2] Loosen the fixing bolts and check that 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.