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15 TROUBLESHOOTING
LED
Classifica
Error
indicator
tion of
code
of servo
errors
amplifier
2020
20
2024
24
2025
25
Servo
amplifier
errors
2030
30
Error name
Communication error occurred
Encoder error 2
between encoder and servo amplifier.
Ground fault occurred at the
Main circuit error
servomotor power (U, V and W
phases) of the servo amplififer.
Absolute position data in error.
Absolute position
lost
Power was switched on for the first
time in the absolute position detection
system.
Permissible regenerative power of the
built-in regenerative brake resistor or
regenerative brake option is
exceeded.
Regenerative
error
Regenerative transistor fault
Description
15 - 38
MELSEC-Q
Cause
The encoder connecter (CN2) is
disconnected.
Fault in the encoder.
Encoder cable fault. (Wire breakage
or shot)
Power input wires and servomotor
power wires are in contact.
Sheathes of servomotor power
cables deteriorated, resulting in
ground fault.
Main circuit of servo amplifier failed.
Voltage low in the super capacitor in
the encoder.
Battery voltage low.
Battery cable or battery fault.
Home position not set.
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-J3-B : 260VAC or more
MR-J3-B1: 135VAC or more
Built-in regenerative brake resistor
or regenerative brake option faulty.
Regenerative transistor faulty.
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