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MELSEC-Q
15 TROUBLESHOOTING
Classifi-
cation of
errors
Error
code
LED
indicator
of servo
amplifier
Error name Description Cause
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.
Servo motor miswiring servo
amplifier terminals U, V, W phase
do not mach motor terminals U, V,
W phase.
The servo system is unstable,
causing hunting.
The bus voltage of the unit has
decreased.
2051 51 Overload 2
Machine collision or the like caused
max. output current to flow
successively for several seconds.
Servomotor locked: 1s
Encoder faulty.
Acceleration/deceleration time
constant too small.
Torque limit value too small.
Start disabled due to insufficient
torque caused drop in power supply
voltage.
Servo
amplifier
errors
2052 52 Error excessive
Droop pulse of the deviation counter
reached or exceeded setting
value(Initial value: 80kPLS) of the
parameter
Pr.131
.
The setting value for "
Pr.113
Position control gain 1" too small.
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