Instruction manual

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5. OPERATION AND FUNCTIONS

5.6 Functions

5.6.1 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:

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: speed

deviation, position 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 encode

Servo amplifier

Figure 5.1 Outline of linear servo control error detection function

(1) Position deviation error detection

Set the parameter No. PS04 to "

1" to make the position deviation error detection enabled.

Position deviation

error detection

Parameter No. PS04

If there is a deviation larger than the setting value (1 to 200mm) 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 5.1, the alarm (Linear servo control error detection 42) occurs, and the linear

servo motor stops. The initial value of parameter No. PS05 is 50mm. Change the setting value as necessary.