2. TROUBLESHOOTING FOR MR-CV_POWER REGENERATION CONVERTER UNIT
2 - 5
No.
Name/Description
Cause
Check method
Check result
Action
71 Undervoltage
The power supply
voltage dropped.
(1) The power supply
wiring is incorrect.
Check the power
supply wiring.
It has a failure.
Wire it correctly.
It has no failure.
Check (2).
(2) Power supply voltage is
low.
Check if the power
supply voltage is at
the prescribed value
or lower.
200 V class: 190 V DC
400 V class: 380 V DC
The voltage is the
prescribed value or
lower.
Review the power
supply voltage.
The voltage is
higher than the
prescribed value.
Check (3).
(3)
An
instantaneous
power failure has
occurred for 60 ms or
longer.
Check if the power
has a problem.
It has a problem.
Review the power.
It has no problem.
Check (4).
(4) A part in the power
regeneration converter
unit is malfunctioning.
Disconnect the cables
except for the power
supply, and then
check the
repeatability.
It is repeatable.
Replace the power
regeneration
converter unit.
72 Cooling fan error
The speed of the
cooling fan on the
power
regeneration
converter unit has
decreased.
(1) Foreign matter was
caught in the cooling
fan.
Check if a foreign
matter is caught in the
cooling fan.
Something has
been caught.
Remove the foreign
matter.
Nothing has been
caught.
Check (2).
(2) Cooling fan life expired. Check if the cooling
fan is stopping.
It is stopping.
Replace the power
regeneration
converter unit.
73 Regenerative
error
The load ratio
exceeded the
excessive
regeneration
protection
characteristic of
the power
regeneration
converter unit.
(1) The regenerative load
ratio exceeded 100%.
Check "Converter
regenerative load
ratio" with MR
Configurator2.
It is 100% or more.
Reduce the
frequency of
positioning.
Reduce the load.
75 Overvoltage
The value of the
bus voltage
exceeded the
prescribed value.
200 V class: 420 V
DC
400 V class: 840 V
DC
(1) The
regeneration
capacity is insufficient.
Set a longer
deceleration time
constant, and then
check the
repeatability.
It is not repeatable.
Check operation
pattern.
Or use a larger
converter unit.
It is repeatable.
Check (2).
(2) Power supply voltage
high.
Check if the voltage of
the input power supply
is over the prescribed
value.
200 V class: 297 V AC
400 V class: 594 V AC
It is higher than the
prescribed value.
Reduce the power
supply voltage.
It is at the
prescribed value or
lower.
Check (3).
(3) A ground fault or short
occurred at the servo
motor power cable.
Check if only the servo
motor power cable is
shorted.
It is shorted.
Replace the servo
motor power cable.
It is not shorted.
Check (4).
(4) A ground fault occurred
at the servo motor.
Disconnect the servo
motor power cables on
motor side, and check
insulation among
phases (U, V, and W).
It is shorted.
Replace the servo
motor.
It is not shorted.
Check (5).
(5) Something near the
device caused it.
Check the noise,
ambient temperature,
etc.
It has a failure.
Take
countermeasures
against its cause.
Содержание MELSERVO MR-J4-B-RJ Series
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