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15 TROUBLESHOOTING
LED
Classifi-
Error
indicator
cation of
code
of servo
errors
amplifier
2052
52
Servo
amplifier
errors
2086
8E
Error name
Droop pulse of the deviation counter
reached or exceeded setting value
Error excessive
(Initial value: 8 rotation) of the
parameter Pr.131 .
The fault has occurred in
Serial
communication between the servo
communication
amplifier and communication devices
error
(e.g. personal computer).
Description
15 - 44
MELSEC-Q
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.
The bus voltage of the unit due to
the breakdown.
The communication cable fault.
(Wire breakage or shot)
The communication devices
(e.g. personal computer) fault.
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