9 USING A LINEAR SERVO MOTOR
9.2 Startup [G] [WG]
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For absolute position linear encoder
The magnetic pole detection is required in the following cases.
• When the system is set up (at initial startup of equipment)
• After a servo amplifier is replaced
• After a linear servo motor (primary-side or secondary-side) is replaced
• After a linear encoder (scale or head) is replaced or remounted
If a gap is generated to the positional relation between the linear encoder and the linear servo motor, perform the magnetic
pole detection again.
1.
Execute the magnetic pole detection.
Page 235 For incremental encoder
2.
After the completion of the magnetic pole detection, change [Pr. PL01.0 Servo motor magnetic pole detection selection]
to "0" (Magnetic pole detection disabled).
When [Pr. PL01.0 Servo motor magnetic pole detection selection] is set to "0" (Magnetic pole detection disabled) after the
magnetic pole detection, the magnetic pole detection after each power-on is not required.
How to replace servo amplifier without magnetic pole detection
When replacing the servo amplifier, carry out the magnetic pole detection again. If the magnetic pole detection cannot be
performed, write the magnetic pole information from the servo amplifier before replacement to the one after replacement by
using MR Configurator2.
Procedure
1.
Read the magnetic pole information of the servo amplifier before replacement.
2.
Write the read magnetic pole information to the servo amplifier after replacement.
3.
To ensure safety, perform the test operation with the torque limited and confirm that the servo motor can be operated
safely.
Migration method of the magnetic pole information
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How to read magnetic pole information from servo amplifier before replacement
1.
Open the project in MR Configurator2 and select the model.
2.
Check that the personal computer is connected with the servo amplifier, and select "Diagnosis" and then "Linear
diagnosis".
3.
Click "Magnetic Pole Information" to open the magnetic pole information window.
4.
Click "Read" in the magnetic pole information window.
5.
Note down the values shown in data 1 of the magnetic pole information window.
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How to write magnetic pole information to servo amplifier after replacement
1.
Open the project in MR Configurator2 and select the model.
2.
Check that the personal computer is connected with the servo amplifier, and select "Diagnosis" and then "Linear
diagnosis".
3.
Click "Magnetic Pole Information" to open the magnetic pole information window.
4.
To data 1 of the magnetic pole information window, input the values of the magnetic pole information which were noted
down.
Servo parameter
Description
PL01.0
Servo motor magnetic pole detection selection
0: Magnetic pole detection disabled
1: Magnetic pole detection at initial servo-on after cycling the power
5: Magnetic pole detection at every servo-on
Initial value: 1 (Magnetic pole detection at initial servo-on after cycling the power)
