7 - 2
7. TROUBLESHOOTING
Indication
Name
Definition
Cause
Action
1. Power supply voltage is low.
2. Instantaneous control power failure
occurred for more than 100ms.
3. Power switched on within 5s after it
had switched off.
4. Shortage of power supply capacity
caused the power supply voltage to
drop at start, etc.
Review the power supply.
A.10
Undervoltage
Control power supply
voltage dropped to the
following voltage.
5. Faulty parts in the servo amplifier
Checking method
Alarm (A.10) occurs if power is
switched on after connectors
disconnected.
Change the Converter unit.
A.12
Memory alarm 1 RAM, ROM memory
fault
A.13
Clock alarm
Printed board fault
A.15
Memory alarm 2 EEP-ROM fault
Failure of the part in the converter unit.
Checking method
Alarm (A.10, A.13, A.15) occurs
if power is switched on after
connectors disconnected.
Change the Converter unit.
1. Wrong setting of parameter No. 0
Set correctly.
2. Regenerative brake option is not
connected.
Connect correctly.
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative brake option to be
exceeded.
Checking method
Call the status display and check
the regenerative load ratio.
1. Reduce the frequency of
positioning.
2. Use the regenerative brake
option of larger capacity.
3. Reduce the load.
4. Power supply voltage is abnormal.
MR-HP30KA: 260VAC or more
MR-HP55KA4: 520VAC or more
Review power supply
5. Regenerative transistor faulty.
Checking method
1) The regenerative brake option
has overheated abnormally.
2) The alarm occurs even after
removal of the built-in
regenerative brake resistor or
regenerative brake option.
Change the Converter unit.
6. Regenerative brake option faulty.
Change Converter unit or
regenerative brake option.
A.30
Regenerative
alarm
Permissible
regenerative power of
the built-in
regenerative brake
resistor or
regenerative brake
option is exceeded.
7. Unusual overheat due to cooling fan
stop
1. Change the Converter unit or
cooling fan.
2. Reduce ambient temperature.
1. Regenerative brake option is not
used.
Use the regenerative brake
option.
2. Though the regenerative brake
option is used, the parameter No. 0
setting is " 0 (not used)".
Make correct setting.
3. Lead of regenerative brake option is
open or disconnected.
1. Change lead.
2. Connect correctly.
4. Regenerative transistor faulty.
5. Wire breakage of regenerative
brake option
1. For wire breakage of built-in
regenerative brake resistor,
change Converter unit.
2. For wire breakage of regenerative
brake option, change regenerative
brake option.
A.33
Over voltage
Converter bus voltage
exceeded to following
voltage.
MR-HP30KA: 400VDC
MR-HP55KA4: 800VDC
6. Capacity of regenerative brake
option is insufficient.
Add regenerative brake option or
increase capacity.
1. Servo amplifier fault caused the
parameter setting to be rewritten.
Change the Converter unit.
A.37
Parameter
alarm
Parameter setting is
wrong.
2. Parameter data improper-setting.
Set parameter correctly.
1. Converter unit faulty.
Change the Converter unit
2. The power supply was turned on and
off continuously by overloaded status.
The drive method is reviewed.
A.45
Main circuit
device overheat
Main circuit device
overheat
3. Air cooling fan of servo amplifier stops. The cooling method is reviewed.
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