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MELSEC-Q
15 TROUBLESHOOTING
15.2.2 MR-H-BN detection error
Classifi-
cation of
errors
Error
code
LED
indicator
of servo
amplifier
Error name Description Cause
The power supply voltage is low.
For MR-H700BN or less:
There was an instantaneous
control power failure of 15ms or
longer.
For MR-H11KBN or less:
There was an instantaneous
control power failure of 10ms or
longer.
Shortage of power supply capacity
caused the power supply voltage to
drop at start, etc. .
Power was restored after the bus
voltage had dropped to 200VDC.
(Main circuit power switched on
within 5s after it had switched off.)
2010 10 Under voltage The power supply voltage to drop.
Faulty parts in the servo amplifier.
2012 12 Memory error 1 ROM or RAM memory error.
2013 13 Clock error Printed circuit board fault.
2014 14 Watchdog error CPU parts of the circuit fault.
2015 15 Memory error 2 EEP-ROM error.
Faulty parts in the servo amplifier.
The encoder connecter is
disconnected.
Fault in the encoder.
Encoder cable fault. (Wire breakage
or shot)
2016 16 Encoder error 1
Communication error occurred
between encoder and servo amplifier.
Improper motor was connected with
servo amplifier.
2017 17 Board error 2 CPU or parts of the circuit fault.
2019 19 Memory error 3 Flash memory error.
Faulty parts in the servo amplifier.
2020 1A
Servomotor
combination
error
Servomotor and servo amplifier
combination
When using servomotor, improper
motor was connected with servo
amplifier.
The encoder connecter is
disconnected.
Fault in the encoder.
2020 20 Encoder error 2
Communication error occurred
between encoder and servo amplifier.
Encoder cable fault. (Wire breakage
or shot)
Power input cable and servomotor
output cable are making contact at
the main circuit terminal block(TE1).
Servo
amplifier
errors
2024 24
Motor output
side ground fault
Servomotor output (U, V, W phase)
ground fault.
Servomotor power cable insulation
deteriorated.
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