IAI Msep, Instruction Manual

Page: 227 / 296

Chapter 6
Troubleshooting
219
6.2.2 Positioning and speed of poor precision (incorrect operation)
Situation Possible cause Check/Treatment
Completion of operation
on the way to home
return
In the home return of our standard
specification, the actuator is first
pressed to the mechanical end, moved
oppositely, and subject to positioning
stop at the home position. Therefore,
the product may judge as the
mechanical end even though it is still on
the way when the load is large and
interfere with surrounding object.
1) A load exceeding its rating weight is
installed on the actuator.
2) It is touched to interference in the way
of the run.
3) Torsion stress is applied to guide due
to improper fixing method of the
actuator or uneven fastening of bolts.
4) The sliding resistance of the actuator
itself is large.
1) Reduce the load.
2) Remove the interference.
3) Loosen the fixing bolts once and
check whether the slider can
move smoothly.
If the slider can move smoothly,
check if there is a deformation on
the attached surface, and install
the actuator again following the
instructions stated in Instruction
Manual.
4) Please contact IAI.
Shocks at start and/or
stop.
Acceleration/deceleration is set too
high.
Decrease the settings of
acceleration/deceleration.
Overshoot during
deceleration to stop.
The load inertia is large. Decrease the setting of
deceleration.
Positioning of poor
precision
Uneven speed during
movement
Acceleration/deceleration
not smooth (bad speed
response)
[Refer to 5.3 Servo Adjustment.]
Positioning at a position
different from that of
commanded position No.
1) For PIO Type, the start signal CSTR
after the position number command is
too early, or input at the same timing.
(Note) Inputting at the same timing is
available for Fieldbus Type.
2) The correct position No. is not
specified due to PIO signal
disconnection or poor connector
contact.
1) The stop position may be set for
another purpose. Make sure to
complete the reading of the
position numbers to this controller
before inputting the start signal.
2) Check the input signal on I/O
monitor on the teaching tool.
Complete signal PEND is
not output even though
positioning process is
completed.
Start signal CSTR is not turned OFF. Make the start signal CSTR turned
OFF before completing the
positioning process by the turn-off
of positioning complete signal
PEND after starting operation, and
so on.