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Cam Axis Feed Current Value Restoration - Mitsubishi Electric QD77MS User Manual

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5.3.3 Cam axis feed current value restoration

If "[Pr.462] Cam axis position restoration object" is set to "2: Cam axis feed current value
restoration" when starting synchronous control, the cam axis feed current value is restored
based on the cam axis current value per cycle and the cam reference position.
Select the method for the cam axis current value per cycle and the method for the cam
reference position to be restored.
Pr.464 Setting method of cam axis
current value per cycle
0: Previous value
1: Initial setting value of cam axis
current value per cycle
2: Current value per cycle
after main shaft gear
3: Current value per cycle after
auxiliary shaft gear
Pr.463 Setting method of cam
reference position
0: Previous value
1: Initial setting value of cam
reference position
2: Feed current value
Restrictions
The cam axis feed current value moves to its restored value just after starting synchronous
control when the cam axis feed current value to be restored is different from the feed
current value at synchronous control start.
If the difference is larger than "In-position width (PA10)" of servo amplifier in pulse
command units, the error "Cam axis feed current value restoration disable" (error code:
769) will occur and synchronous control cannot be started.
Note that, if the setting value of "In-position width" is large, a rapid operation may occur.
Md.407 Cam axis current
Md.408 Cam reference
Cam axis current value per cycle
Cam axis feed current value
Cam reference position
POINT
With cam axis feed current value restoration, calculate the cam axis feed current
value with the cam position calculation function (Refer to Section 5.5) or with
synchronous control analysis mode (Refer to Section 5.4) before starting
synchronous control. Then start synchronous control after positioning to the correct
cam axis feed current value.
Chapter 5 Synchronous Control Initial Position
value per cycle
The cam axis feed current value is
restored based on the cam axis current value
per cycle and the cam reference position.
position
5 - 19
Md.409 Cam axis feed current value

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