Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 482

Magnetic pole detection method setting
In the following cases, set the magnetic pole detection method to the minute position detection method.
• When a shortened travel distance at the magnetic pole detection is required
• When the magnetic pole detection by the position detection method is not completed properly
Set the magnetic pole detection method by using the first digit of [Pr. PL08] (Magnetic pole detection method selection).
[Pr. PL08]
Magnetic pole detection method selection
0: Position detection method
4: Minute position detection method
Setting of the magnetic pole detection voltage level by the position detection method
For the magnetic pole detection by the position detection method, set the voltage level with [Pr. PL09 Magnetic pole detection
voltage level]. For the magnetic pole detection by the minute position detection method, the voltage level setting is not
required.
■Guideline of parameter settings
Set the parameters by referring to the following table.
Servo status
Thrust at operation
Overload, overcurrent alarm
Magnetic pole detection alarm
Magnetic pole detection accuracy
■Setting procedure
1.
Perform the magnetic pole detection, and increase the setting value of [Pr. PL09 Magnetic pole detection voltage level]
until [AL. 33 Overvoltage], [AL. 50 Overload 1], [AL. 51 Overload 2], [AL. E1 Overload warning 1], and [AL. EC Overload
warning 2] occur. Increase the setting value by five as a guide value. When these alarms and warnings occur during the
magnetic pole detection with MR Configurator2, the test operation of MR Configurator2 automatically completes and the
servo-off status is established.
2.
Specify the setting value that is an approximately 70% of the value set when [AL. 50 Overload 1], [AL. 51 Overload 2],
[AL. 33 Overvoltage], [AL. E1 Overload warning 1], and [AL. EC Overload warning 2] occurred as the final setting value.
If [AL. 27 Initial magnetic pole detection error] occurs with this value, specify a value intermediate between the value set
at [AL. 50 Overload 1], [AL. 51 Overload 2], [AL. 33 Overvoltage], [AL. E1 Overload warning 1], and [AL. EC Overload
warning 2] and the value set at the magnetic pole detection alarm as the final setting value.
3.
Perform the magnetic pole detection again with the final setting value, and make sure that the accuracy of the magnetic
pole detection is as required.
■Setting example
Linear encoder magnetic
pole detection
[Pr. PL09] setting
Occurring
Alarm
Not occurring
In this example, the final setting value of [Pr. PL09] is 49 (Setting value at the alarm occurrence = 70  0.7).
14 USING A LINEAR SERVO MOTOR
480
14.3 Operation and functions
[Pr. PL09] setting (guide value)
Small  Medium  Large
(10 or less (initial value) 50 or more)
Small
Seldom occurs
Frequently occurs
Low
30 35 40
While increasing the setting value of [Pr. PL09], carry out the
magnetic pole detection repeatedly.
Large
Frequently occurs
Seldom occurs
High
45 65
An alarm has occurred when the setting
value of [Pr. PL09] is set to "70".
70