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MELSEC-Q
15 TROUBLESHOOTING
Classifi-
cation of
errors
Error
code
LED
indicator
of servo
amplifier
Error name Description Cause
Servo motor shaft was rotated by
external force.
Collision with the machine
The motor encoder fault.
Servo motor miswiring servo
amplifier terminals U, V, W phase
don’t mach motor terminals U, V, W
phase.
2052 52 Error excessive
Droop pulse of the deviation counter
reached or exceeded setting value
(Initial value: 8 rotation) of the
parameter
Pr.131
.
The bus voltage of the unit due to
the breakdown.
The communication cable fault.
(Wire breakage or shot)
Servo
amplifier
errors
2086 8E
Serial
communication
error
The fault has occurred in
communication between the servo
amplifier and communication devices
(e.g. personal computer).
The communication devices
(e.g. personal computer) fault.
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