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MELSEC-Q
15 TROUBLESHOOTING
Classifica
tion of
errors
Error
code
LED
indicator
of servo
amplifier
Error name Description Cause
Parameter "
Pr.102
Regenerative
brake resistor" setting value error.
Built-in regenerative brake resistor
or regenerative brake option is not
connected.
High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative brake option to be
exceeded.
Power supply voltage is abnormal.
MR-J2S-B: 260VAC or more
MR-J2S-B1: 135VAC or more
Permissible regenerative power of the
built-in regenerative brake resistor or
regenerative brake option is
exceeded.
Regenerative brake option faulty.
Regenerative transistor faulty.
2030 30
Regenerative
error
Regenerative transistor fault
Built-in regenerative brake resistor
or regenerative brake option faulty.
Small acceleration/deceleration
time constant caused overshoot to
be large.
Servo system is instable to cause
overshoot.
2031 31 Overspeed
Speed has exceeded the
instantaneous permissible speed.
Fault in the encoder.
Output phases U, V, W phase of the
servo amplifier were connected with
each other.
Transistor of the servo amplifier
damaged.
Short circuit in the servo amplifier
out put phase U, V, W phase.
Servo
amplifier
errors
2032 32 Overcurrent
Current that flew is higher than the
permissible current of the servo
amplifier.
Noise entered the overcurrent
detection circuit.
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