Mitsubishi Electric MELSERVO-J4 series Instruction Manual page 421

14. USING A LINEAR SERVO MOTOR
(a) Position deviation error detection
Set [Pr. PL04] to "_ _ _ 1" to enable the position deviation error detection.
When you compare the model feedback position ( 1)) and the feedback position ( 2)) in figure 14.1, if
the deviation is 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] will occur and the linear servo motor
will stop. The initial value of this detection level is 50 mm. Replace the set value as required.
(b) Speed deviation error detection
Set [Pr. PL04] to "_ _ _ 2" to enable the speed deviation error detection.
When you compare the model feedback speed ( 3)) and the feedback speed ( 4)) in figure 14.1, if
the deviation is more than the value of [Pr. PL06 Speed deviation error detection level] (1 mm/s to
5000 mm/s), [AL. 42.2 Servo control error by speed deviation] will occur and the linear servo motor
will stop. The initial value of this detection level is 1000 mm/s. Replace the set value as required.
(c) Thrust deviation error detection level
Set [Pr. PL04] to "_ _ _ 4" to enable the thrust deviation error detection.
When you compare the command thrust ( 5)) and the feedback thrust ( 6)) in figure 14.1, if the
deviation is more than the value of [Pr. PL07 Torque/thrust deviation error detection level] (1% to
1000%), [AL. 42.3 Servo control error by torque/thrust deviation] will occur and the linear servo
motor will stop. The initial value of this detection level is 100%. Replace the set value as required.
(d) Detecting multiple deviation errors
When setting [Pr. PL04] as shown below, multiple deviation errors can be detected. For the error
detection methods, refer to (1) (a), (b), (c) of this section.
[Pr. PL04]
1
Position deviation error detection enabled
[Pr. PL04]
2
Speed deviation error detection enabled
[Pr. PL04]
4
Thrust deviation error detection enabled
[Pr. PL04]
Position deviation
Setting
error detection
value
1
2
3
4
5
6
7
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Speed deviation Thrust deviation
error detection error detection