Mitsubishi Electric MELSEC-Q QD75M User Manual page 737

15 TROUBLESHOOTING
LED
Classifica
Error indicator
tion 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
(default value: 80kPLS) 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 - 74
MELSEC-Q
Cause
Torque limit value too small.
Start disabled due to insufficient
torque caused drop in power supply
voltage.
The setting value for " Pr.113
Position control gain 1" too small.
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.