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MELSEC-Q
15 TROUBLESHOOTING
Classifica
tion of
errors
Error
code
LED
indicator
of servo
amplifier
Error name Description Cause
The current exceeded the
continuous output current of the
servo amplifier.
The servo system is unstable,
causing hunting.
Collision with the machine.
Servomotor miswiring servo
amplifier terminals U, V, W phase
do not mach motor terminals U, V,
W phase.
2050 50 Overload 1
Load exceeded overload protection
characteristic of servo amplifier.
Load ratio 300%: 2.5s or more
Load ratio 200%: 100s or more
The motor encoder fault.
Collision with the machine.
Servomotor miswiring servo
amplifier terminals U, V, W phase
don't mach motor terminals U, V, W
phase.
The servo system is unstable,
causing hunting.
Servo
amplifier
errors
2051 51 Overload 2
Machine collision or the like caused
max. output current to flow
successively for several seconds.
Servomotor locked:
1s or more
During rotation:
2.5s or more
The motor encoder fault.