7 - 3
7. TROUBLESHOOTING
Indication
Name
Definition
Cause
Action
A.50
Over load 1
Load exceeded overload
protection characteristic
of Converter unit
Converter unit is used in excess of its
continuous output current.
1. Reduce load.
2. Review operation pattern.
A.51
Overload 2
Machine collision or the
like caused max. output
current to flow
successively for several
seconds.
Machine struck something.
1. Review operation pattern.
2. Install limit switches.
8888
Watchdog
CPU/part is faulty.
Failure of the part in the converter
unit.
Checking method
Alarm (8888) occurs if all
connectors are disconnected
and power is switched on.
Change the converter unit.
7.1.3 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.
Indication
Name
Definition
Cause
Action
A.E0
Excessive
regenerative
load warning
There is a possibility
that regenerative power
may exceed permissible
regenerative power of
regenerative brake
option.
Regenerative power increased to 85%
or more of permissible regenerative
power of built-in regenerative brake
resistor or regenerative brake option.
Checking method
Call the status display and check
regenerative load ratio.
1. Reduce frequency of
positioning.
2. Change regenerative brake
option for the one with larger
capacity.
3. Reduce load.
A.E1
Over load
warning
There is a possibility
that overload alarm 1 or
2 may occur.
Load increased to 85% or more of
overload alarm 1 or 2 occurrence
level.
Cause, checking method
Refer to A.50,51.
Refer to A.50, A.51.
1. Power supply voltage is low.
Review power supply.
A.E9
Undervoltage
warning
Bus voltage dropped.
MR-HP30KA: 180V
MR-HP55KA4: 360V
2. P and/or N is not connected.
Carry out wiring properly.
7.1.4. 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. 5, switch power off once. Switching it on again clears the alarm
history. At this time, the parameter No. 5 setting returns to "0000".
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