Remedies For Alarms - Mitsubishi Electric Melservo-J4 Instruction Manual

2.4

Remedies for alarms

No. Name/Description
61 Overcurrent
• A current higher than the
permissible current was
applied to the power
regeneration converter
unit.
62 Frequency error
• The frequency of the input
power supply exceeds the
permissible range.
2 TROUBLESHOOTING FOR MR-CV_POWER REGENERATION CONVERTER UNIT
140
2.4 Remedies for alarms
Cause
(1) The combination of AC
reactor and power
regeneration converter
unit is incorrect.
(2) The current exceeds the
instantaneous maximum
rating of the power
regeneration converter
unit.
(3) The power supply
capacity is insufficient.
(4) The phases of the input
power supply voltage are
unbalanced.
(5) Something near the
device caused it.
(6) The power regeneration
converter unit is
malfunctioning.
(1) The main circuit power
supply is turned off.
(2) The frequency of the
input power supply is out
of the specifications.
(3) The power supply
voltage is unstable
during operation.
(4) Something near the
device caused it.
(5) The power regeneration
converter unit is
malfunctioning.
Check method Check result
Check if the correct AC It is incorrect.
reactor is connected.
It is correct.
Check if the maximum It is larger than the
value of total output instantaneous maximum
current of the servo rating of the power
motor connected to the regeneration converter
power regeneration unit.
converter unit does not
It is lower than or equal
exceed the
to the instantaneous
instantaneous maximum
maximum rating of the
rating of the power
power regeneration
regeneration converter
converter unit.
unit.
Check the power supply It is insufficient.
capacity.
It is sufficient.
Check if the potential It is equal to or larger
difference of the input than the prescribed
power supply voltage is value.
less than the prescribed
It is less than the
value.
prescribed value.
200 V class: 10 V
400 V class: 20 V
Check the noise, There is a problem in the
grounding, etc. surrounding.
There is no problem in
the surrounding.
Replace the power It is not repeatable.
regeneration converter
unit, and then check the
repeatability.
Check the main circuit The main circuit power
power supply. supply is turned off.
The main circuit power
supply is turned on.
Check if the normal It is out of range.
power supply voltage
waveform is within 50 Hz It is within range.
± 3% or 60 Hz ± 3%.
Measure the power The frequency
supply voltage at motor fluctuation at
acceleration/ acceleration/
deceleration. deceleration is large.
It has no failure.
Check the noise, There is a problem in the
grounding, etc. surrounding.
There is no problem in
the surrounding.
Replace the power It is not repeatable.
regeneration converter
unit, and then check the
repeatability.
Action
Connect the correct AC
reactor.
Check (2).
Check operation pattern.
Or increase the capacity
of the power
regeneration converter
unit.
Check (3).
Check the power supply
capacity.
Check (4).
Improve the balance of
power supply phases.
Check (5).
Take countermeasures
against its cause.
Check (6).
Replace the power
regeneration converter
unit.
Turn on the main circuit
power supply.
Check (2).
Check the power supply.
Check (3).
Check the power supply.
Check (4).
Take countermeasures
against its cause.
Check (5).
Replace the power
regeneration converter
unit.