Mitsubishi Electric Melservo-J3 Series MR-J3-B Instruction Manual page 356

13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
(3) Remedies for warnings
Continuing operation in an alarm occurrence status may result in an alarm or disable proper operation.
Eliminate the cause of the warning according to this section. The warning displayed will disappear when the
cause of its occurrence is resolved.
Display Name
A.91 Overheat
warning
A.E0 Excessive
regenerative
load warning
A.E1 Over load
warning
A.E6 Converter
forced stop
warning
A.E8 Cooling fan
speed
reduction
warning
(4) Clearing the alarm history
You can clear the alarm numbers stored in the alarm history of the alarm mode. To ensure that you can
control the alarms that will occur after regular operation, make this setting before starting regular operation
to clear the alarm history.
After setting "0001" in parameter No. PA09, switch power off once. Switching it on again clears the alarm
history. At this time, the parameter No. PA09 setting returns to "0000".
Definition
The temperature of the fin
exceeded the warning level.
There is a possibility that
regenerative power may
exceed permissible
regenerative power of
regenerative option.
There is a possibility that
overload alarm 1 or 2 may
occur.
EM1 is off.
The speed of the converter
unit cooling fan decreased
to or below the warning
level.
Cause
1. Operated in the overloaded status.
2. Ambient temperature of converter
unit is over 55 .
3. Used beyond the specifications of
close mounting.
4. Converter unit faulty.
Regenerative power increased to 85%
or more of permissible regenerative
power of regenerative option.
Checking method
Call the status display and check the
regenerative load ratio.
Load increased to 85% or more of
overload alarm 1 or 2 occurrence level.
Cause, checking method
Refer to A.50, 51.
External forced stop was made valid.
(EM1 was turned off.)
1. Cooling fan life expiration. (Refer to
section 2.6.)
2. The power supply of the cooling fan
failed.
13 - 59
Action
Review operation pattern.
Review environment so that
ambient temperature is 0 to 55 .
Use within the range of
specifications.
Change the converter unit.
1. Reduce frequency of
positioning.
2. Change regenerative option for
the one with larger capacity.
3. Reduce load.
Refer to A.50, A.51.
Ensure safety and deactivate
forced stop.
Change the cooling fan of the
converter unit.
Change the converter unit.