Mitsubishi Electric MELDAS C6 Interface Manual page 211

B con-
Signal name
tact
ERROR TEMPORARY
—
CANCEL
[Function]
This signal temporarily cancels the error caused by the speed fluctuation when the chuck is closed.
When the chuck is closed, the speed will fluctuate due to external causes. An error will occur
between the basic spindle's position and the synchronous spindle's position due to this speed
fluctuation. This signal is used to cancel this error. (If spindle synchronization is attempted when
closing the chuck without canceling this error, torsion could occur.)
[Operation]
The error between the basic spindle's position and synchronous spindle's position is saved when
this signal changes from OFF to ON. The saved error is canceled and the spindle is synchronized
while this signal is ON. (Even if the chuck close signal is OFF, the error will be canceled while the
"Error temporary cancel" signal is ON.)
(Note 1) Turn this signal ON after the chucks on both the basic spindle side and synchronous
spindle side have closed and grasped the chuck.
(Note 2) Turn this signal OFF when the either the basic spindle side or synchronous spindle side
chuck is open.
(Example)
(1) Close the basic spindle side chuck.
(2) Start spindle synchronization (G114.1).
(3) Close the synchronous spindle side chuck.
(The speed will fluctuate due to external causes at this time, and an error will occur.)
(4) Using the "Chuck close confirmation" signal (SPCMP), check that the chucks are closed.
(5) Turn the "Error temporary cancel" signal (SPDRPO) ON, and cancel the error.
(6) Execute machining with spindle synchronous control.
(7) Open the chuck on the synchronous spindle side.
(8) Using the "Chuck close confirmation" signal (SPCMP), check that the chuck is opened.
(9) Turn the "Error temporary cancel" signal (SPDRPO) OFF, and stop the error cancellation.
[Related signals]
In spindle synchronous control (SPSYN1: X42A)
Spindle rotation speed synchronization complete (FSPRV: X42B)
Spindle phase synchronization complete (FSPPH: X42C)
Chuck close confirmation (SPCMP: X42D)
Chuck close (SPCMPC: Y431)
6. EXPLANATION OF INTERFACE SIGNALS
6.3 PLC Output Signals (Bit Type: Y***)
Signal
abbreviation
SPDRPO
6-3-14
1st system 2nd system
Y437 —
3rd system
—