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MELSEC-Q
15 TROUBLESHOOTING
15.2.2 MR-J3-B detection error
There is an error that the same code is used. Confirm the error for details by the
indication of the servo amplifier.
Classifica
tion of
errors
Error
code
LED
indicator
of servo
amplifier
Error name Description Cause
The power supply voltage is low.
There was an instantaneous control
power failure of 60ms or longer.
Shortage of power supply capacity
caused the power supply voltage to
drop at start, etc. .
The bus voltage had dropped to the
following value or less.
MR-J3-B : 200VDC
MR-J3-B1: 158VDC
2010 10 Under voltage
• For MR-J3-B:
The power supply voltage dropped
to 160VAC or less.
• For MR-J3-
B1:
The power supply voltage dropped
to 83VAC or less.
Faulty parts in the servo amplifier.
2012 12
Memory error 1
(RAM)
RAM memory error. Faulty parts in the servo amplifier.
Printed circuit board fault. Faulty parts in the servo amplifier.
2013 13 Clock error
Clock error transmitted from the
QD75MH.
Faulty QD75MH.
2014 14
CPU watch dog
error
Printed circuit board fault. Faulty parts in the servo amplifier.
Faulty parts in the servo amplifier.
2015 15
Memory error 2
(EEP-ROM)
EEP-ROM error
The number of write times to EEP-
ROM exceeded 100,000.
The encoder connecter (CN2) is
disconnected.
Fault in the encoder.
Encoder cable fault. (Wire breakage
or shot)
2016 16
Encoder error 1
(At power on)
Communication error occurred
between encoder and servo amplifier.
Encoder cable type (2-wire, 4-wire)
selection was wrong in parameter
setting.
2017 17 Board error CPU or parts of the circuit fault.
Servo
amplifier
errors
2019 19
Memory error 3
(Flash-ROM)
ROM memory error.
Faulty parts in the servo amplifier.