Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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486
14 USING A LINEAR SERVO MOTOR
14.3 Operation and functions
Operation from controller
For the system using the incremental linear encoder, the magnetic pole detection is automatically performed at the first servo-
on after the power-on. For this reason, when performing the positioning operation, create the sequence which surely confirms
the servo-on status as the inter lock condition of the positioning command.
Function
Linear servo control error detection function
For the linear servo control error detection function, the position and speed deviation error detections are
enabled by default. ([Pr. PL04]: _ _ _ 3)
If the linear servo control becomes unstable for some reasons, the linear servo motor may not operate properly. To detect this
state and to stop operation, the linear servo control error detection function is used as a protective function.
The linear servo control error detection function has three different detection methods: the position deviation, speed deviation,
and thrust deviation. An error is detected when each method is enabled with [Pr. PL04 Linear servo motor/DD motor function
selection 2]. The detection level can be changed with [Pr. PL05], [Pr. PL06], and [Pr. PL07].
■
Outline of linear servo control error detection function
■ Position deviation error detection
Set [Pr. PL04] to "_ _ _ 1" to enable the position deviation error detection.
When the difference between 1) and 2) in figure 14.1 is equal to or more than the value of [Pr. PL05 Position deviation error
detection level] (1 mm to 1000 mm), [AL. 42.1 Servo control error by position deviation] occurs and the linear servo motor
stops. The initial value of this detection level is 50 mm. Change the setting value as necessary.
For "Outline of linear servo control error detection function", refer to the following.

Page 486 Outline of linear servo control error detection function
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 [%]
Servo amplifier
Linear servo motor
Linear encoder
[Pr. PL04]
Position deviation error detection enabled
1