Mitsubishi Electric MELSEC-Q QD75M User Manual page 749

15 TROUBLESHOOTING
LED indicator
Classifica
of servo
Error
tion of
amplifier
code
errors
IFU
2051 —
Servo
amplifier
errors
2052 —
Error name
DRU
Machine collision or the like
caused max. output current to
flow successively for several
seconds.
@A.51# Overload 2
Droop pulse of the deviation
counter reached or exceeded
setting value (Initial value: 2
@A.52# Error excessive
rotation) of the parameter
" Pr.131 ".
Description
Servomotor locked:
0.3s or more
During rotation:
2.5s or more
15 - 86
MELSEC-Q
Cause
Collision with the machine
Servomotor miswiring drive unit
terminals U, V, W phase don't mach
motor terminals U, V, W phase.
Wrong connection of servomotor.
Drive unit's output U, V, W do not
match servo motor's input U, V, W.
The servo system is unstable,
causing hunting.
The motor encoder fault.
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.
Servomotor shaft was rotated by
external force.