Mitsubishi A1SD75M3 User Manual page 620

14 TROUBLESHOOTING
Servo
Error
amplifier
code
LED display
2051 51 Overload 2
2052 52 Error excessive
2086 8E RS-232 alarm
Name Definition
Machine collision or like
caused max. output
current to flow
successively for several
seconds.
Servomotor locked:
1s or more
Droop pulse value of the
deviation counter
exceeded 80kpulses.
Serial communication
error occurred between
servo amplifier and
telecommunication
equipment (parameter
unit, personal computer
or similar device).
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.
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.
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).
2. Telecommunication equipment faulty.
14 - 32
MELSEC-A
Occurrence factor