Omron CS1W-MCH71 Operation Manual page 674

Troubleshooting
No. Problem
1 The CPU Unit's Power supply lines are
RUN indicator wired incorrectly.
does not light
2 The power supply voltage
when the power
is low.
is turned ON.
3 An internal fuse has blown. Check the fuses.
4 The power supply is defec-
tive.
5 Only the MC The power supply capacity
Unit's Run indi- is insufficient.
cator fails to light
when the power
is turned ON.
6 The MC Unit is defective.
7 Servo cannot be The MC Unit is not operat-
locked. ing.
8 Commands cannot be
received from the ladder
program because the MC
Unit's operation mode is in
the tool mode.
9 Another axis control bit is
ON at the same time.
10 The MC Unit is defective.
11 The motor is not The servo is not locked.
turning.
12 The wiring is incorrect
between the MC Unit and
the Servo Driver.
13 A run prohibit input, such
as POT or NOT, of W-
series Servo Driver is
enabled (OFF with default
setting) (when Cn-01 bits 2
and 3 are 0).
14 The Servo Driver is in the
internally set speed control
mode (and is not receiving
MC Unit speed reference).
15 A Servo Driver alarm has
occurred.
16 The mechanical axis is
locked.
17 The MC Unit is defective.
Probable causes
Check the power supply wiring.
Check the power supply.
Check the power supply.
Add up the power supply capac-
ity for all of the Units mounted to
the same Backplane, including
the CPU Unit, and compare that
to the power supply capacity of
the Power Supply Unit. If the
combined capacity of the Units
is greater than that of the power
Supply Unit, then they cannot
be properly used.
Is the RUN indicator lit?
Check the operation mode
using the Support Tool.
• Check whether another axis
control bit is ON at the same
time.
• Try executing Servo Lock using
the Support Tool.
• 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
with the Support Tool.
Check the Servo Driver setting.
Check the contents of the Servo
Driver alarm.
Check whether there is a
mechanical limit or lock in effect.
Item to check
Correct the power supply wiring.
Check the power supply capac-
ity and correct the power supply.
Replace the fuse and determine
what caused it to blow. (Refer to
the troubleshooting section in
the applicable CPU Unit opera-
tion manual).
Replace the power supply.
• Increase the power supply
capacity.
• Change the configuration so
that the power supply capacity
at the Backplane is not
exceeded.
Replace the MC Unit.
Check No.5.
Set the mode to RUN mode or
CPU mode.
Turn OFF the other axis control
bit and turn ON the bit [Servo
Lock]. (Change the ladder pro-
gram.)
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.
• Disable (ON with default set-
ting) the Servo Driver run pro-
hibit input.
Correct the Servo Driver setting.
If there is an alarm, follow the
instructions.
Manually release the mechani-
cal lock.
Replace the MC Unit.
Section 11-1
Remedy
629