Mitsubishi Electric MELSERVO MRJ2S-B, Instruction Manual

Page: 156 / 200

Troubleshooting Alarms and Warnings
9 - 8
Display Error Definition Cause Action
51 Overload 2 Max. output current
flow successively for
several seconds.
Servo motor locked:
1s or more 1. Mechanical overload 1. Ensure that
mechanical
components run
smoothly
2. Install limit
switches
2. Wrong connection of servo motor.
Servo amplifiers output terminals U, V,
W do not match servo motors input
terminals U, V, W.
Connect correctly
3. Servo system is instable 1. Repeat
acceleration/
deceleration to
execute auto tuning
2. Change auto
tuning response
setting
3. Set auto tuning
to OFF and make
adjustment
manually
4. Encoder faulty Change the servo
motor
52 Error excessive Contouring error is
greater than the
value set with
parameter 31 (initial
value: 8 revolutions). 1. Acceleration/deceleration time
constant is too small.
Increase the
acceleration/
deceleration time
constant
2. Torque limit value is too small. Increase the torque
limit value
3. Motor cannot be started due to
torque shortage caused by power
supply voltage drop.
1. Improve the
impedance of the
power supply
2. Use servo motor
which provides
larger output
4. Position control gain 1
(parameter No.13) value is small.
Increase set value
and adjust to
ensure proper
operation
5. Servo motor shaft was rotated by
external force. 1. When torque is
limited, increase
the limit value.
2. Reduce load
3. Use servo motor
that provides larger
output
6. Mechanical overload 1. Ensure that
mechanical
components run
smoothly
2. Install limit
switches
7. Encoder faulty Change the servo
motor
8. Wrong connection of servo motor.
Servo amplifiers output terminals U, V,
W do not match servo motors input
terminals U, V, W.
Connect correctly
Tab. 9-2: Failure corrective action (5)