Remedies For Warnings - Mitsubishi Electric MELSERVO-J4 Instruction Manual

2. TROUBLESHOOTING FOR MR-CV_POWER REGENERATION CONVERTER UNIT

2.5 Remedies for warnings

No. Name/Description
E9 Instantaneous
power failure
warning
[AL. 71] may
occur.
EA External forced stop
warning
EM1 (forced stop)
of the power
regeneration
converter unit
was turned off.
EB Excessive
regeneration
warning
[AL. 73] may
occur.
EC Overload warning
[AL. 7E] may
occur.
EE Cooling fan speed
reduction warning
The cooling fan
speed decreased
to the warning
occurrence level
or less.
Cause
(1) An instantaneous power
failure has occurred for
30 ms or longer.
(1) EM1 of the power
regeneration converter
unit was turned off.
(2) The external 24 V DC
power supply is off.
(3) The power
regeneration converter
unit is malfunctioning.
(1) The regenerative load
ratio of the power
regeneration converter
unit has been over
80%.
Check it with the check method for [AL. 7E] and [AL. 7F].
Check it with the check method for [AL. 72].
2 - 7
Check method Check result
Check if the power It has a problem.
has a problem.
Check the status of It is off.
EM1 of the power
regeneration
converter unit.
It is on.
Check if the external It is not inputted.
24 V DC power supply
is inputted.
It is inputted.
Replace the power It is not repeatable.
regeneration converter
unit, and then check
the repeatability.
Check the It is 80% or more.
regenerative load ratio
of the power
regeneration converter
unit.
Action
Review the power.
Ensure safety and
turn on EM1 of the
power regeneration
converter unit.
Check (2).
Input the 24 V DC
power supply.
Check (3).
Replace the power
regeneration
converter unit.
Reduce the
frequency of
positioning.
Reduce the load.