IAI ERC3, Instruction Manual

Page: 163 / 188

Chapter 5
Troubleshooting
5.2 Fault Diagnosis
155
5.2.2 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 Instruction Manual for the ERC3 actuator with integrated controller
of 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.
ME0302-4A