15 - 86
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
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.
2051
— @A.51#
Overload 2
Machine collision or the like
caused max. output current to
flow successively for several
seconds.
Servomotor locked: 0.3s
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.
Servo
amplifier
errors
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 shaft was rotated by
external force.
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