Omron CS1W-MCH71 Operation Manual page 675

Troubleshooting
No. Problem
18 Origin search An error or warning has
cannot be exe- been generated.
cuted.
19 The Servo Driver's origin
proximity input is wired
incorrectly.
20 The communications cable
to the Servo Driver is not
correctly connected.
21 The direction of rotation
does not match the direc-
tion of the limit input.
22 The limit input is wired
incorrectly.
23 Origin search cannot be
executed because the Unit
is in Automatic Mode.
(Excluding DATUM com-
mand)
24 Commands cannot be
received from the ladder
program because the oper-
ating mode of the MC Unit
is Tool Mode.
25 Origin search Another axis control bit is
cannot be exe- ON at the same time.
cuted.
26 Not entering the in-position
range.
27 The origin search creep
speed is too fast.
28 The parameters are set
incorrectly.
29 The MC Unit is defective.
30 The origin estab- There is some looseness in
lished by the ori- couplings or other mechan-
gin search ical connections.
sometimes
changes.
31 There is no origin margin.
630
Probable causes
Check the contents of the error
or warning.
Use the Support Tool's input sig-
nal monitor function to check
whether the sensors are turning
ON and OFF normally.
Check the communications
cable.
If axis rotation is reaching the
mechanical limit without revers-
ing direction, use the Support
Tool to check whether the limit
inputs are turning ON and OFF
normally.
Check the limit input wiring.
• Monitor the bit [Automatic
Mode].
• Set the mode to Program
Mode and forcibly set only the
bit [Origin Search].
Check the operating mode with
the Support Tool.
• Check whether another axis
control bit is ON at the same
time.
• Try executing Origin search
using the Support Tool.
• Is the MC Unit parameter's in-
position range too narrow?
• Is the Servo Driver gain too
low?
Check the origin search creep
speed.
Upload and check the MC Unit
parameters with the Support
Tool.
Check whether there is any
deviation from the markings at
the couplings between the
motor and axes, or at any other
connections.
Monitor the origin margin using
the Support Tool. If the value is
near the Servomotor's Encoder
resolution x the ratio (1, 2, or 4),
or near zero, a deviation of one
motor revolution may occur at
the time of the origin search due
to even a minute change in the
timing of sensor inputs.
Item to check
If there is an error or warning,
follow the instructions.
Correct the wiring.
Correct the wiring.
Correct the limit input wiring.
Correct the limit input wiring.
Set the mode to Manual Mode
and then execute Origin Search.
(Change the ladder program.)
Set the mode to RUN Mode or
CPU Mode.
Turn OFF the other axis control
bit and then turn ON the bit [Ori-
gin Search].
(Change the ladder program.)
• Increase the MC Unit parame-
ter's in-position range.
• Increase the Servo Driver or
MC Unit gain.
Decrease the origin search
creep speed.
Set the parameters correctly,
transfer them to the MC Unit,
and write them to flash memory.
Replace the MC Unit.
Tighten up the connections.
Remove the motor coupling and
adjust it by about a 1/4 turn, so
that the origin margin pulses will
be about 1/2 of the Servomo-
tor's encoder resolution x the
ratio (1, 2, or 4), and then try
executing the origin search
again.
Section 11-1
Remedy