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Cam Axis Position Restoration Method; Cam Axis Current Value Per Cycle Restoration - Mitsubishi Electric RD77MS2 User Manual

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5.3

Cam Axis Position Restoration Method

Cam axis current value per cycle restoration

If "[Pr.462] Cam axis position restoration object" is set to "0: Cam axis current value per cycle restoration" when starting
synchronous control, the cam axis current value per cycle is restored based on the cam reference position and the cam axis
feed current value.
Select the method for the cam reference position to be restored. The feed current value when starting synchronous control is
used as the cam axis feed current value.
The cam axis current value per cycle is restored by searching for the corresponding value from the beginning to the end of the
cam pattern. Set the starting point from where to search the cam pattern in "[Pr.468] Cam axis current value per cycle (Initial
setting)". (It is also possible to search the return path in a two-way cam pattern operation.)
[Md.20] Feed current value
(At synchronous
control start)
[Pr.463] Setting method of cam
reference position
0: Previous value
1: Initial setting
value of cam
reference position
2: Feed current value
Cam axis current value per cycle
Cam axis feed current value
Cam reference position
• With two-way cam pattern operation, if the corresponding cam axis current value per cycle is not found, the
error "Cam axis current value per cycle restoration disable" (error code: 1C28H) will occur and synchronous
control will not be started.
• When starting synchronous control, the feed current value may change slightly from its original position at
starting synchronous control. This is due to the readjustment of the position based on the restored cam axis
current value per cycle. This does not result in the position mismatch.
• With a feed operation cam pattern, if the corresponding cam axis current value per cycle is not found on the
first cycle, the cam reference position is changed automatically and the pattern is searched again.
• If the cam resolution is large, search processing may take a long time when starting synchronous control.
(Cam resolution 256: Up to 0.4 ms, Cam resolution 32768: Up to 26 ms)
[Md.409] Cam axis feed
current value
[Md.408] Cam reference
position
Search the cam pattern
(It is also possible to search from the middle
of the cam axis current value per cycle.)
The cam axis current value per cycle is
restored based on the cam reference position
and cam axis feed current value.
[Md.407] Cam axis current value per cycle
5 SYNCHRONOUS CONTROL INITIAL POSITION
5.3 Cam Axis Position Restoration Method
5
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