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8. TANDEM DRIVE
(b) Deviation compensation valid
The motion detected by the proximity dog slows down to stop, and return to the proximity dog front end,
setting there to the home position. When deviation compensation is valid, the proximity dog signals for
the master axis and for the slave axis are used to calculate the amount of deviation between each dog
front end position or to compensate the deviation between the master axis and the slave axis. To
perform the calculation or the compensation of deviation amount, designate adjustment mode or normal
mode using tandem drive options (parameter No.0265).
1) Adjustment mode
a) Summary
Adjustment mode is used during mechanical adjustment, and is used to calculate the dog front end
position offset (amount of deviation in the position of the proximity dog front end for the master axis
and slave axis).
When executing home position return while in adjustment mode, after detecting the master axis
dog front end position and the slave axis dog front end position while returning to home position,
the axes are moved to the dog front end position of the master axis. At this time the amount of
offset from the position of the dog front end for the master axis to the position of the dog front end
for the slave axis is calculated and output using the tandem drive home position signal offset
(parameter No.026C, 026D). This amount of offset is used when compensating the amount of
deviation between the master axis and slave axis when returning to home position; therefore, after
completing home position return save this offset on the user program.
Note. Prior to returning to home position, set the axis linking the master axis and slave axis mechanically at a right angle
to the movement direction. If it is not at a right angle, the dog front end position offset amount can not be correctly
calculated.
b) Start operation method
1. Adjust the axis linking the master axis and slave axis mechanically at a right angle to the
movement direction.
2. Set the home position return method (parameter No.0240) to "Dog front end method" and
tandem drive option (parameter No.0265) to "Adjustment mode".
3. Start home position return operation.
4. After home position return is complete, read the tandem drive home position signal offset
(parameter No.026C, 026D) and save it to the user program.