Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 239

8. TROUBLESHOOTING
Alarm No.: A.52 Name: Error excessive
Description
Detailed Detailed
display Name
52.4 Error 1)
excessive at
torque limit
value zero
52.5 Droop 1)
pulses
excessive 2
2)
3)
4)
5)
6)
7)
8)
9)
10) Estimation of the load to
11) Position loop gain value is
12) Servo motor is rotated by
13) Encoder faulty
Alarm No.: A.61 Name: Operation alarm
Description
Detailed Detailed
display Name
61.1 Auxiliary 1)
function
setting error
The droop pulse between the command position and current position exceeds the alarm level.
Cause
Torque limit value is "0".
Servo motor power cables
are not connected.
(missing phase)
Incorrect connection with
the servo motor
Incorrect connection of the
encoder cable
Torque limit value is small.
The work collided against
the structural part.
Torque shortage
Servo motor cannot be
started due to torque
shortage caused by power
supply voltage drop.
Acceleration/deceleration
time constant is short.
Gain adjustment is not
made well.
motor inertia moment ratio
is not estimated well.
small.
external force.
The point table is incorrect.
Cause
"1" or "3" is set to the
auxiliary function of the
last point table (No.7).
Checking method
Check the torque limit Torque limit value is
value. "0".
Execute the checking methods mentioned in the alarm display "52.3".
Check if the alarm Alarm does not
occurs after replacing occur.
with the servo
operating normally.
Checking method
Check the auxiliary "1" or "3" is set.
function value of the
last point table.
8 - 22
Result Action
Increase the torque limit
value.
Replace the servo motor.
Result Action
Check the setting.