Mitsubishi Electric MELSERVO-J4 Instruction Manual page 140

2. TROUBLESHOOTING FOR MR-CV_POWER REGENERATION CONVERTER UNIT
No. Name/Description
62 Frequency error
The frequency of
the input power
supply exceeds
the permissible
range.
66 Process error
The process did
not complete
within the
specified time.
67 Open phase
The wirings of L1,
L2, and L3 are
incorrect.
68 Watchdog
A part such as
CPU is
malfunctioning.
69 Ground fault
A ground fault
occurred on the
servo motor
power lines.
Cause
(1) The frequency of the
input power supply is
out of the
specifications.
(2) The power supply
voltage is unstable
during operation.
(3) Something near the
device caused it.
(4) The power
regeneration converter
unit is malfunctioning.
(1) Something near the
device caused it.
(2) The power
regeneration converter
unit is malfunctioning.
(1) Any of the wirings L1,
L2, and L3 is not
connected. Or, it is
disconnected.
(2) A part in the power
regeneration converter
unit is malfunctioning.
(1) A part in the power
regeneration converter
unit is malfunctioning.
(1) A ground fault occurred
at the servo motor
power cable.
(2) A ground fault occurred
at the servo motor.
(3) The servo amplifier is
malfunctioning.
(4) The power
regeneration converter
unit is malfunctioning.
2 - 3
Check method Check result
Check if the normal It is out of range.
power supply voltage
waveform is within 50
It is within range.
Hz ± 3% or 60 Hz ±
3%.
Measure the power The frequency
supply voltage at fluctuation at
motor acceleration/ acceleration/
deceleration. deceleration is
large.
It has no failure.
Check the noise, It has a failure.
grounding, etc.
It has no failure.
Replace the power It is not repeatable.
regeneration converter
unit, and then check
the repeatability.
Check the power It has a failure.
supply for noise.
Check if the connector
is shorted.
It has no failure.
Replace the power It is not repeatable.
regeneration converter
unit, and then check
the repeatability.
Check if the wirings of It has a failure.
L1, L2, and L3 are
incorrect.
It has no failure.
Replace the power It is not repeatable.
regeneration converter
unit, and then check
the repeatability.
Replace the power It is not repeatable.
regeneration converter
unit, and then check
the repeatability.
Check if only the servo A ground fault is
motor power cable is occurring.
shorted.
A ground fault is not
occurring.
Check if the servo A ground fault is
motor power cables on occurring.
motor side (U, V, and
A ground fault is not
W) and grounding are
occurring.
insulated.
Replace the servo It is not repeatable.
amplifier, and then
check the
It is repeatable.
repeatability.
Replace the power It is not repeatable.
regeneration
converter unit, and
then check the
repeatability.
Action
Check the power
supply.
Check (2).
Check the power
supply.
Check (3).
Take
countermeasures
against its cause.
Check (4).
Replace the power
regeneration
converter unit.
Take
countermeasures
against its cause.
Check (2).
Replace the power
regeneration
converter unit.
Review the wiring.
Check (2).
Replace the power
regeneration
converter unit.
Replace the power
regeneration
converter unit.
Replace the servo
motor power cable.
Check (2).
Replace the servo
motor.
Check (3).
Replace the servo
amplifier.
Check (4).
Replace the power
regeneration
converter unit.