Yaskawa SGDH Linear Sigma Series - Manual (Page 258)

9 Operation
9.2.3 Setup Procedure Using Linear Servomotors without Hall Sensors
9-14
(5) Setting the Linear Scale Pitch
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.
(6) Selecting No Hall Sensor
Select No Hall Sensor for the parameter Pn080.0. The factory setting is Pn080.0 = 0 (With hall sensor), so
the setting will change to Pn080.0 = 1 (No hall sensor). The setting validation is required to enable the set-
tings.
Normal status
Example of alarm display
Pn280 Linear Scale Pitch
Setting Range Setting Unit Factory Setting Setting Validation
0 to 65535 1 μm 0 μm 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.
Parameter Description
Pn080 n.†††0 With hall sensor (factory setting)
n.†††1 No hall sensor
When Pn080.0 = 0 is set without connecting a hall sensor, the alarm A.C2 (phase error detection) alarm will occur when the
power is turned ON.
Speed Position Force
64000
Scale pitch ( μm)
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.