Mitsubishi Electric MELSERVO-J4 Instruction Manual page 154

3. TROUBLESHOOTING FOR MR-CR55K(4) RESISTANCE REGENERATION CONVERTER UNIT
No. Name/Description
91 Converter overheat
warning
The temperature
of the resistance
regeneration
converter unit
heat sink reached
a warning level.
E0 Excessive
regeneration
warning
There is a
possibility that
regenerative
power may
exceed
permissible
regenerative
power of
regenerative
resistor
(regenerative
option).
E1 Overload warning 1
[A. 50 Overload 1]
or [A. 51
Overload 2] can
occur.
E6 Converter forced
stop warning
The EM1 (forced
stop) of the
resistance
regeneration
converter unit
was turned off.
E8 Cooling fan speed
reduction warning
The cooling fan
speed decreased
to the warning
level or less.
Cause
(1) Operated in the
overloaded status.
(2) Ambient temperature of
resistance regeneration
converter unit is over
55 ˚C.
(3) The resistance
regeneration converter
unit is malfunctioning.
(1) The regenerative
power exceeded 85%
of the permissible
regenerative power of
the regenerative
resistor (regenerative
option).
(1) Load increased to 85%
or more alarm level of
[A. 50 Overload 1] or
[A. 51 Overload 2].
(1) The EM1 (forced stop)
of the resistance
regeneration converter
unit was turned off.
(2) The external 24 V DC
power supply is off.
(3) The resistance
regeneration converter
unit is malfunctioning.
(1) Foreign matter was
caught in the cooling
fan.
(2) Cooling fan life expired. Check the total of
3 - 9
Check method Check result
Check the effective The effective load
load ratio. ratio is high.
The effective load
ratio is small.
Check the ambient It is over 55 ˚C.
temperature.
It is less than 55 ˚C.
Replace the resistance It is not repeatable.
regeneration converter
unit, and then check
the repeatability.
Check the effective It is 85% or more.
load ratio.
Check it with the check method for [A.50] and [A.51].
Check the status of It is off.
the EM1 (forced stop)
of the resistance
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 resistance It is not repeatable.
regeneration converter
unit, and then check
the repeatability.
Check if a foreign Something has
matter is caught in the been caught.
cooling fan.
Nothing has been
caught.
It exceeds the
power on time of the cooling fan life.
resistance
regeneration
converter unit.
Action
Check operation
pattern.
Check (2).
Lower the ambient
temperature.
Check (3).
Replace the
resistance
regeneration
converter unit.
When the
regenerative option
is used.
Reduce the
frequency of
positioning.
Reduce the load.
Review the
regenerative
option capacity.
When the
regenerative option
is not used.
Use the
regenerative
option.
Ensure safety and
turn on the EM1
(forced stop) of the
resistance
regeneration
converter unit.
Check (2).
Input the 24 V DC
power supply.
Check (3).
Replace the
resistance
regeneration
converter unit.
Remove the foreign
matter.
Check (2).
Replace the
resistance
regeneration
converter unit.