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MELSEC-A
14 TROUBLESHOOTING
Error
code
Servo
amplifier
LED display
Name Definition Occurrence factor
1. Machine struck something.
2. Wrong connection of servomotor.
Servo amplifier's output terminals U, V, W do not match
servomotor's input terminals U, V, W.
3. Servo system is instable and hunting.
4. The bus voltage of the unit has decreased.
2051 51 Overload 2
Machine collision or like
caused max. output
current to flow
successively for several
seconds.
Servomotor locked:
1s or more
5. Encoder faulty.
1. Acceleration/deceleration time constant is small.
2. Motor cannot be started due to torque shortage caused by power
supply voltage drop.
3. " Pr.113 Position loop gain 1" value is small.
4. Bus voltage of the unit dropped due to failure.
5. Servomotor shaft was rotated by external force.
6. Machine struck something.
7. Encoder faulty.
2052 52 Error excessive
Droop pulse value of the
deviation counter
exceeded 80kpulses.
8. Wrong connection of servomotor.
Servo amplifier's output terminals U, V, W do not match
servomotor's input terminals U, V, W.
1. Communication cable faulty (open cable or short circuit).
2086 8E RS-232 alarm
Serial communication
error occurred between
servo amplifier and
telecommunication
equipment (parameter
unit, personal computer
or similar device).
2. Telecommunication equipment faulty.
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