Mitsubishi Electric MELSEC-Q QD75M User Manual page 751

15 TROUBLESHOOTING
LED indicator
Classifica
of servo
Error
tion of
amplifier
code
errors
IFU
2052 —
2053
FA.53
Servo
amplifier
errors
2054 FA.54
2090 FA.8A
2086 FA.8E
Error name
DRU
Droop pulse of the deviation
counter reached or exceeded
setting value (Initial value: 2
@A.52# Error excessive
rotation) of the parameter
Pr.131 .
Drive unit whose effective load
Multiple axis
factor is 85% or more is
—
overload
adjacent.
Alarm occurred in one or more
Drive unit
— axes of drive units installed to
alarm
the base unit.
Serial communication stopped
Serial
for longer than the time set in
— communication
IFU parameter
time-out
The fault has occurred in
Serial
communication between the
— communication interface unit and
error
communication devices
(e.g. personal computer).
Description
Pr.1
.
15 - 88
MELSEC-Q
Cause
Collision with the machine
The motor encoder fault.
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.
Encoder cable and power cable
(U, V, W phase) coming out of one
drive unit are connected to the
incorrect servomotor.
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.
Protocol is incorrect.
The communication cable fault.
(Wire breakage or shot)
The communication devices
(e.g. personal computer) fault.