Mitsubishi Electric MELSERVO MR-J2-A Product Specifications And Installation Manual page 203

8. TROUBLESHOOTING
Alarm Code
Display
CN1B- CN1A- CN1A-
19 pin 18 pin 19 pin
A. 50 0 1 1
A. 51 0 1 1
Name Definition
Overload 1
Overload 2 Machine collision
or the like caused
max. output
current to flow
successively for
several seconds.
Servo motor
locked:
1s or more
8– 11
Cause
4. Wrong connection of servo
motor. Servo amplifier's output
terminals U, V, W do not match
servo motor's input terminals
U, V, W.
5. Encoder faulty.
Checking method
When the servo motor shaft is
rotated slowly with the servo off,
the cumulative feedback pulses
should vary in proportion to the
rotary angle. If the indication
skips or returns midway, the
encoder is faulty.
1. Machine struck something.
2. Wrong connection of servo
motor. Servo amplifier's output
terminals U, V, W do not match
servo motor's input terminals
U, V, W.
3. Servo system is instable and
hunting.
4. Encoder faulty.
Checking method
When the servo motor shaft is
rotated slowly with the servo off,
the cumulative feedback pulses
should vary in proportion to the
rotary angle. If the indication
skips or returns midway, the
encoder is faulty.
Action
Connect correctly.
Change the servo
motor.
1. Review
operation
pattern.
2. Install limit
switches.
Connect correctly.
1. Repeat acceleration/
deceleration to execute
auto tuning.
2. Change auto tuning
response level setting.
3. Set auto tuning to OFF
and make gain
adjustment manually.
Change the servo
motor.
8