IAI America ERC3 - Manual (Page 368)

Chapter 7
Troubleshooting
7.2 Fault Diagnosis
358
7.2.2 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/deceleratio
n not smooth (bad speed
response)
Trace of poor precision
[Refer to 6.3.1 [3] and 6.3.2 [3] Servo Adjustment.]
(Note) When the pulse-train operation mode is selected, first adjust pulse-train
commands.
[In the case of Positioner Mode]
Situation Possible cause Check/Treatment
Positioning at a position
different from that of
commanded position No.
PIO signal processing is incorrect.
1) Start signal CSTR is input too early
after position No. command. Or
position No. command and start signal
are input concurrently.
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 ERC3 before
inputting the start signal.
[Refer to Chapter 4, 4.2 Operation
in Positioner Mode and 10.6
Example of Basic Positioning
Sequence.]
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.
PIO signal processing is incorrect.
1) Start signal CSTR is not turned OFF.
1) 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.