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8. TROUBLESHOOTING
Alarm No.: A.24
Name: Main circuit error
Description
Ground fault occurred in the servo motor power cables.
Ground fault occurred in the servo motor
Detailed
display
Detailed
Name
Cause
Checking method
Result
Action
24.1
Ground fault
detected by
the hardware
detection
circuit
1) Driver fault
Alarm occurs even if
the power cables (U, V,
W) are disconnected.
Alarm occurs.
Replace the driver.
Alarm does not
occur.
Check 2).
2) Ground fault or short of
the servo motor power
cables
Check if the power
cables themselves
(between U, V, W and
) are shorted.
Cables are shorted. Replace the power cables.
No problem.
Check 3).
3) Ground fault in the servo
motor
Remove the power
cables from the servo
motor and check if
short occurs in the
servo motor (between
U, V, W and
).
Servo motor is
shorted.
Replace the servo motor.
No problem.
Check 4).
4) Power supply cables and
servo motor power cables
are shorted.
Check if there is a
contact between the
power supply cables
and the servo motor
power cables at power-
off.
There is a contact.
Connect correctly.
No contact.
Check 5).
5) Fault in the surrounding
environment
Check the noise, etc.
An error is found.
Take the appropriate
measures according to the
cause.
24.2
Ground fault
detected by
the software
detection
1) Driver fault
Execute the checking methods mentioned in the alarm display "24.1".
2) Ground fault or short of
the servo motor power
cables
3) Ground fault in the servo
motor
4) Power supply cables and
servo motor power cables
are shorted.
5) Fault in the surrounding
environment