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9 Operation
9.2.2 Setup Procedure Using Linear Servomotors with Hall Sensors
9-8
(4) Setting the Linear Scale Pitch (Grating)
Turn ON the control power supply.
When the power is supplied normally, the panel operator on the front panel of the SERVOPACK will show the
following display. A linear scale pitch setting error (A.08) will be displayed, but does not indicate an error. Set
the scale pitch (Pn280) according to the scale being used. After setting validation of the control power, the A.08
alarm will be cleared, and the settings will be enabled.
If an alarm other than A.08 is displayed, as shown in the following diagram, the power supply circuit, linear ser-
vomotor main circuit cable or encoder cable wiring is the probable cause. Shut down the power supply, specify
the location causing the alarm, and take corrective measures so that the display returns to the above normal sta-
tus. For details on alarms, refer to
11.1 Troubleshooting
.
Normal status
Example of alarm display
Pn280
Linear Scale Pitch
Setting Range
Setting Unit
Factory Setting
Setting Validation
0 to 65535
1
µ
m
0
µ
m
After restart
If the linear scale pitch (Pn280) is not set correctly, the linear servomotor cannot be controlled. Make sure that the correct
value is set before operating the linear servomotor.
When using a SERVOPACK right after factory shipment, the alarm A.08 (Linear Scale Pitch Setting Error) will be dis-
played but does not indicate an error. This alarm is generated to remind the user to set Pn280. After setting the correct value
and setting validation, the alarm A.08 is cleared.
Control is performed the SERVOPACK using 1/256 the distance of the scale pitch as a minimum feedback pulse. The count
is performed in the serial converter unit using 1/256 of the linear scale pitch.
Make sure that the scale pitch satisfies the following conditions.
Speed
Position
Force
64000
Scale pitch (
µ
m)
Value of = Integer
Examples
Corrent: 1, 2, 4, 8, 10 ,16, 40
Incorrect: 3, 12, 18
Linear scale pitch
Linear scale pitch (Pn280) =
Distance of one cycle of the analog voltage feedback signal.
Содержание SGLFW
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