
B-63783EN-1/01 1.AXIS CONTROL
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1.9.3 Synchronization Alignment
When the power is turned on, or the emergency stop state is canceled,
the master axis and slave axis under synchronous control are not
always placed in the same position. At this time, the synchronization
alignment function matches the position of the master axis with the
position of the slave axis.
Synchronization alignment method
The synchronization alignment method depends on whether to perform
synchronous error compensation.
- Synchronization alignment when synchronous error compensation is performed
When synchronous error compensation is performed (with bit 2 (CLP)
of parameter No. 1803 for the slave axis set to 0), synchronization is
established using the same method as that for synchronous error
compensation. This means that a positional difference between the
master axis and slave axis is regarded as being a synchronous error, and
the pulses matching the positional difference multiplied by the
synchronous error compensation gain are output to the slave axis. So,
if no synchronous error compensation gain is set in parameter No. 1915,
synchronization alignment is not performed.
If a synchronous error zero width is set in parameter No. 1912,
synchronization alignment is no longer performed when the positional
difference between the master axis and slave axis becomes equal to or
less than the synchronous error zero width.
- Synchronization alignment based on machine coordinates
To establish synchronization when synchronous error compensation is
not performed (with bit 2 (CLP) of parameter No. 1803 for the slave
axis set to 1), bit 0 (SYC) of parameter No. 1010 must be set to 1 so that
synchronization alignment based on the machine coordinates can be
enabled.
This method of synchronization alignment establishes synchronization
by outputting the command pulses for the slave axis that match the
machine coordinate difference between the master axis and slave axis.
The command pulses matching a machine coordinate difference are
output at one time, so that the machine makes a sudden large movement
if a large compensation value is involved. So, parameter No. 7724 is
used to set a maximum allowable compensation value used for
synchronization. Set such a maximum compensation value that a
sudden machine movement has no adverse effect. If a compensation
value greater than the setting of this parameter is specified, an alarm
(OT513) is issued, thus disabling synchronization alignment. When a
maximum compensation value of 0 is set, synchronization is not
established.