10.3 Parameter Settings for Fully-Closed Loop Control
10.3.5 Electronic Gear Setting
10-8
Related Parameters
Note: The maximum setting for the encoder output resolution is 4,096.
If the resolution of the external encoder exceeds 4,096, pulse output will no longer be possible at the resolu-
tion given in
Feedback Resolution of Linear Encoder on page 5-43.
10.3.5
Electronic Gear Setting
Refer to the following section for details.
5.14 Electronic Gear Settings on page 5-40
With fully-closed loop control, the same setting as for a Linear Servomotor is used.
10.3.6
Alarm Detection Settings
This section describes the alarm detection settings (Pn51B and Pn52A).
Pn51B (Motor-Load Position Deviation Overflow Detection
Level)
This setting is used to detect the difference between the feedback position of the Servomotor
encoder and the feedback load position of the external encoder for fully-closed loop control.
If the detected difference exceeds the setting, an A.d10 alarm (Motor-Load Position Error Over-
flow) will be output.
Note: If you set this parameter to 0, A.d10 alarms will not be output and the machine may be damaged.
Pn52A (Multiplier per Fully-closed Rotation)
Set the coefficient of the deviation between the Servomotor and the external encoder per Ser-
vomotor rotation.
This setting can be used to prevent the Servomotor from running out of control due to damage
to the external encoder or to detect belt slippage.
If the setting is 20 and the speed is 1,600 mm/s, the output frequency would be 1.6 Mpps
= 1,600,000 = 1.6 Mpps
Because 1.6 Mpps is less than 6.4 Mpps, this setting can be used.
Pn281
Encoder Output Resolution
Setting Range Setting Unit Default Setting When Enabled Classification
1 to 4,096 1 edge/pitch 20 After restart Setup
Pn51B
Motor-Load Position Deviation Overflow Detection Level
Setting Range Setting Unit Default Setting When Enabled
Classifica-
tion
0 to
1,073,741,824
1 reference unit 1000 Immediately Setup
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