Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

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13. USING A LINEAR SERVO MOTOR
13 - 33
13.5.6 Functions
(1) Linear servo control error detection function
POINT
For the linear servo control error detection function, the position and speed
deviation error detections are enabled as factory-set. (Parameter No.PS04:
3)
If the linear servo control gets unstable for some reasons, the linear servo motor may not operate properly.
The protective function for detecting this before happens and stopping the operation is the linear servo
control error detection function.
As the linear servo control error detection function, there are three types of detection methods: position
deviation, speed deviation and thrust deviation. An error is detected when each error detection function is
enabled with the setting of the parameter No.PS04 (Linear function selection 2). The detection level can be
changed with the parameter Nos. PS05, PS06 and PS07.
Servo amplifier internal value
1) Model feedback position [mm]
3) Model feedback speed [mm/s]
5) Command thrust [%]
Linear encoder
2) Feedback position [mm]
4) Feedback speed [mm/s]
6) Feedback thrust [%]
Linear servo motor
Linear encoder
Servo amplifier
Figure 13.1 Summary of linear servo control error detection function
(a) Position deviation error detection
Set the parameter No.PS04 to " 1" to make the position deviation error detection enabled.
Position deviation
error detection valid
1
Parameter No.PS04
If there is a deviation larger than the setting value (1 to 1000mm) of the parameter No.PS05 (Linear
servo control position deviation error detection level) after comparing the model feedback position 1)
and the feedback position 2) in Figure 13.1, the alarm (Linear servo control error 42. ) occurs, and the
linear servo motor stops. The factory setting of parameter No.PS05 is 50mm. Change the setting value
as necessary.