10 Operation
10 - 12
G5-series Linear Motors/Servo Drives With Built-in EtherCAT Communications
z Magnetic Pole Position Restoration Method
The magnetic pole position restoration method is the function to restore the magnetic pole position
data after the power supply is reset.
Once perform magnetic pole position estimation and change the following parameter to switch to the
magnetic pole position restoration method. Then, you need not perform magnetic pole position
estimation any more, regardless of whether or not the power supply is reset.
This method is available only when you connect an absolute type external encoder.
Precautions for Correct UsePrecautions for Correct Use
• The magnetic pole position estimation method is executed at the first Servo ON after you turn
ON the power supply. Because the Linear Motor operates during magnetic pole position
estimation, connect a sensor to one of the general-purpose inputs and use the over-travel,
external error, or other function to prevent the motor from hitting the mechanical end stop.
• The magnetic pole position estimation method may not provide correct estimation if there is a
large unbalanced load or friction.
• For the values in the objects starting from Magnetic Pole Position Estimation Force Command
Time (3922 hex) through to Magnetic Pole Position Estimation Time Limit for Stop (3927 hex),
the values set when the magnetic pole position estimation method is started will be used.
Changes made during magnetic pole position estimation will not be reflected on these values.
Index Name Unit Description Reference
3920 hex Magnetic Pole
Detection Method
– Set the magnetic pole detection method.
Select 3 to set the magnetic pole position
restoration method.
P. 9-66
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