Mitsubishi Electric Melservo-J2-JR SERIES Instruction Manual page 133

9. TROUBLESHOOTING
Display Name
A. 35 Command
pulse frequency
error
A. 37 Parameter
error
A. 50 Overload 1
Definition
Input pulse
1. Pulse frequency of the command
frequency of the
pulse is too high.
command pulse is
2. Noise entered command pulses.
too high.
3. Command device failure
Parameter setting is Servo amplifier fault caused the
wrong. parameter setting to be rewritten.
Load exceeded 1. Servo amplifier is used in excess
overload protection of its continuous output current.
characteristic of
servo amplifier.
Load ratio 200%:
2. Servo system is instable and
85s or more
hunting.
3. Machine struck something.
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.
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.
Cause
Checking method
9 - 9
Action
Change the command pulse frequency to a
proper value.
Take action against noise.
Change the command device.
Change the servo amplifier.
1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.
1. Repeat acceleration/
deceleration to execute auto tuning.
2. Change auto tuning response setting.
3. Set auto tuning to OFF and make gain
adjustment manually.
1. Review operation pattern.
2. Install limit switches.
Connect correctly.
Change the servo motor.