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9. TROUBLESHOOTING
Display Name Definition Cause Action
(Note 2)
Alarm details
AL.10 Undervoltage Power supply
voltage dropped.
1. Power supply voltage is low.
<Checking method>
Check that the power supply voltage is
the following voltage or more.
MR-J3-
A: 160VAC
MR-J3-
A1: 83VAC
MR-J3-
A4: 280VAC
Check the power supply. 2
2. Shortage of power supply capacity
caused the power supply voltage to
drop at start, etc.
<Checking method>
Check that the bus voltage is the
following voltage or more.
MR-J3-
A: 200VDC
MR-J3-
A1: 158VDC
MR-J3-
A4: 380VDC
3. The bus voltage dropped to the
following value or less.
MR-J3-
A: 200VDC
MR-J3-
A1: 158VDC
MR-J3-
A4: 380VDC
4. There was an instantaneous control
power failure of 60ms or longer.
1
5. Faulty parts in the servo amplifier.
<Checking method>
1. Alarm (AL.10) occurs if power is
switched on after disconnection of
all cables but the control circuit
power supply cables.
2. Check that the bus voltage is the
following voltage or more.
MR-J3-
A: 200VDC
MR-J3-
A1: 158VDC
MR-J3-
A4: 380VDC
Change the servo amplifier.
6. Waveform of power supply voltage is
distorted.
When power supply impedance is
high, waveform of power voltage is
distorted, and it may recognized as
undervoltage.
Set the parameter No.PC27
to "0001".
AL.12 Memory error 1
(RAM)
RAM, memory fault Faulty parts in the servo amplifier
<Checking method>
Alarm (any of AL.12 and AL.13) occurs
if power is switched on after
disconnection of all cables but the
control circuit power supply cables.
Change the servo amplifier.
AL.13 Clock error Printed board fault Change the servo amplifier.
AL.15 Memory error 2
(EEP-ROM)
EEP-ROM fault 1. Faulty parts in the servo amplifier
<Checking method>
Alarm (AL.15) occurs if power is
switched on after disconnection of all
cables but the control circuit power
supply cables.
Change the servo amplifier.
2. The number of write times to EEP-
ROM exceeded 100,000.