15 - 88
MELSEC-Q
15 TROUBLESHOOTING
LED indicator
of servo
amplifier
Classifica
tion of
errors
Error
code
IFU DRU
Error name Description Cause
Collision with the machine
The motor encoder fault.
2052
— @A.52#
Error excessive
Droop pulse of the deviation
counter reached or exceeded
setting value (Initial value: 2
rotation) of the parameter
"
Pr.131
".
Servomotor miswiring drive unit
terminals U, V, W phase do not
mach motor terminals U, V, W
phase.
Drive unit having large load is
adjacent.
Servo system is instable and
hunting.
2053
FA.53 —
Multiple axis
overload
Drive unit whose effective load
factor is 85% or more is
adjacent.
Encoder cable and power cable
(U, V, W phase) coming out of one
drive unit are connected to the
incorrect servomotor.
2054
FA.54 —
Drive unit
alarm
Alarm occurred in one or more
axes of drive units installed to
the base unit.
Remove the alarm causes of all
drive units where alarm has
occurred.
Communication cable fault. (Wire
break or short circuit)
Communication cycle is longer than
the IFU parameter "
Pr.1
" setting.
2090
FA.8A —
Serial
communication
time-out
Serial communication stopped
for longer than the time set in
IFU parameter "
Pr.1
".
Protocol is incorrect.
The communication cable fault.
(Wire breakage or shot)
Servo
amplifier
errors
2086
FA.8E —
Serial
communication
error
The fault has occurred in
communication between the
interface unit and
communication devices
(e.g. personal computer).
The communication devices
(e.g. personal computer) fault.
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