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MELSEC-Q
15 TROUBLESHOOTING
Classifica
tion of
errors
Error
code
LED
indicator
of servo
amplifier
Error name Description Cause
Acceleration/deceleration time
constant too small.
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.
2052 52 Error excessive
Droop pulse of the deviation counter
reached or exceeded setting value
(Initial value: 8 rotation) of the
parameter
Pr.131
.
Servo motor miswiring servo
amplifier terminals U, V, W phase
don’t mach motor terminals U, V, W
phase.
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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