[Al. 031_Overspeed] - Mitsubishi Electric Melservo-J5 MR-J5 Series User Manual

[AL. 031_Overspeed]

• The servo motor speed exceeded the maximum speed.
[AL. 031.1_Servo motor speed error]
Cause
1.
The command pulse frequency is high.
2.
The setting of the electronic gear is incorrect.
3.
The command from the controller is excessive.
4.
A speed command exceeding the overspeed
alarm level was inputted.
5.
The servo motor at the acceleration is at the
maximum torque (maximum thrust).
6.
The servo system is unstable and oscillating.
7.
The velocity waveform overshot.
8.
The connection destination of the servo motor
power cable or the encoder cable is incorrect.
9.
The connection of the servo motor is incorrect.
10.
The encoder or linear encoder is
malfunctioning.
Check/action method
Check the command pulse frequency. If the command pulse frequency
exceeds the maximum input pulse frequency, review the operation pattern.
Check the setting value of the electronic gear.
Refer to "Parameter detail list" in the following manual.
MR-J5-A User's Manual (Parameters)
Check if the command from the controller exceeds the maximum speed.
When changing the judged value to the permissible speed, set in [Pr. PA 28.4
Speed range limit selection].
Check that the actual servo motor speed is higher than the overspeed alarm
level.
Check if the torque (thrust) is the maximum torque (maximum thrust) at the
acceleration. If the torque (thrust) is the maximum torque (maximum thrust),
increase the acceleration/deceleration time constants. Or reduce the load.
Check if the servo motor is oscillating. If the servo motor is oscillating, adjust
the servo gain. Or reduce the load.
Check if the velocity waveform is overshooting because of the short
acceleration/deceleration time constant. If the velocity waveform is
overshooting, increase the acceleration/deceleration time constant.
Check for any incorrect connection destination of the motor power cable or
encoder cable.
Refer to "Connection example of power supply circuit" in the following manual.
MR-J5 User's Manual (Hardware)
Check the U/V/W wiring.
Refer to "Connection example of power supply circuit" in the following manual.
MR-J5 User's Manual (Hardware)
Refer to "When switching on the power for the first time" in the following
manual.
MR-J5-A User's Manual (Introduction)
MR-J5-G/MR-J5W-G User's Manual (Introduction)
Check if this alarm occurs when the servo motor rotates at the lower speed
than the maximum speed. If the alarm occurs, replace the servo motor or the
linear encoder.
When changing the judged value to the permissible speed, set in [Pr. PA 28.4
Speed range limit selection].
1 SERVO AMPLIFIER TROUBLESHOOTING
1.3 Handling methods for alarms/warnings
1
Model
[A]
[A]
[G]
[WG]
37