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MELSEC-A
14 TROUBLESHOOTING
14.2.5 Errors detected by MR-J2S-B
Error
code
Servo
amplifier
LED display
Name Definition Occurrence factor
1. Power supply voltage is low.
2. An instantaneous power failure occurred for 60ms or longer.
3. Shortage of power supply capacity caused the power supply
voltage to drop at start, etc.
4. Power was restored after the bus voltage dropped to 200VDC.
(Main circuit power switched ON within 5s after it had switched
OFF.)
2010 10 Undervoltage
Power supply voltage
dropped.
MR-J2S-
B:
160VAC or less
MR-J2S-
B1:
83VAC or less
5. Faulty parts in the servo amplifier.
2012 12 Memory error 1 RAM memory fault
2013 13 Clock error Printed board fault
2015 15 Memory error 2 E
2
PROM fault
Faulty parts in the servo amplifier.
1. CN2 connector disconnected.
2. Encoder faulty.
2016 16 Encoder error 1
Communication error
occurred between
encoder and servo
amplifier.
3. Encoder cable faulty (open cable or short circuit)
2017 17 Board error 2 CPU/parts fault
2019 19 Memory error 3 ROM memory fault
Faulty parts in the servo amplifier.
2020 1A
Motor
combination
error
Servo amplifier and
servomotor combined
incorrectly.
Servo amplifier and servomotor were connected in incorrect
combination.
1. Encoder connector (CN2) disconnected.
2020 20 Encoder error 2
Communication error
occurred between
encoder and servo
amplifier.
2. Encoder cable faulty (open cable or short circuit)
1. Power input cable and servomotor output cable are making
contact at the main circuit terminal block (TE1).
2024 24 Ground fault
Ground fault occurred at
the servomotor outputs
(U, V and W phases) of
the servo amplifier.
2. Servomotor power cable insulation deteriorated.
1. Reduced voltage of super capacitor in encoder
2. Battery voltage low
Absolute position data in
error
3. Battery cable or battery is faulty.
2025 25
Absolute
position erase
Power was switched ON
for the first time in
absolute position
detection system.
4. The super capacitor of the absolute position detector is not
charged.
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