Omron CS1W-MC221 - 02-2008 Operation Manual page 551

Troubleshooting Tables
No. Problem
7 Servo cannot be
locked.
8
9
10
11
12 The motor is not
turning.
13
14
15
16
17
18
524
Probable causes
The MC Unit is not operating. Is the RUN indicator lit?
The servo cannot be locked
because the Unit is not in
Automatic Mode.
Instructions cannot be
received from the ladder pro-
gram because the Teaching
Box is in T. BOX ENABLED or
T. BOX RESERVED Mode.
Another axis control bit is ON
at the same time.
The MC Unit is defective.
The servo is not locked.
The wiring is incorrect
between the MC Unit and the
Servo Driver.
A run prohibit input, such as
POT or NOT, is ON for a
U-series Servo Driver (when
Cn-01 bits 2 and 3 are 0).
The Servo Driver is in the
internally set speed control
mode (and is not receiving
MC Unit speed referenced).
A Servo Driver alarm has
been generated.
The mechanical axis is
locked.
The MC Unit is defective.
Items to check
Check the Automatic Mode Bit.
Set the mode to Program Mode
and forcibly set only the
Servo-lock Bit.
Disconnect the Teaching Box
and check again.
Check whether another axis con-
trol bit is ON at the same time.
Try executing servo-lock using
the Teaching Box.
Check whether the Servo Driver
is operating.
Check the MC Unit axis status to
see whether servo is locked.
Check the wiring with a tester.
Change the connecting cables.
Check the run prohibit inputs.
Check the Servo Driver setting.
Check the contents of the Servo
Driver alarm.
Check whether there is a
mechanical limit or lock in effect.
Section 12-1
Remedy
Check No. 5.
Set the mode to
Automatic Mode and then
execute servo-lock.
(Change the ladder
program.)
Disconnect the Teaching
Box or put the Teaching
Box into T. BOX LIMITED
Mode.
Turn OFF the other axis
control bit and turn ON
the servo-lock bit.
(Change the ladder
program.)
Replace the MC Unit.
Execute servo-lock and
then turn the motor.
(Change the ladder
program.)
Correct the wiring.
Turn OFF the Servo
Driver run prohibit input.
Make the setting so that
the Servo Driver run
prohibit inputs will not be
used.
Correct the Servo Driver
setting.
If there is an alarm, then
follow the instructions.
Manually release the
mechanical lock.
Replace the MC Unit.