
B-63943EN-1/02 1.AXIS CONTROL
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1.6.3 Synchronization Establishment
Explanation
Upon power-up or after emergency stop cancellation, the machine
positions on the master axis and slave axis under feed axis
synchronization control are not always the same. In such a case, the
synchronization establishment function matches the machine position
on the master with that on the slave axis.
- Synchronization establishment method
The method of synchronization establishment used when
synchronization error compensation is performed differs from that
used when synchronization error is not performed.
Synchronization establishment based on synchronization error compensation
When synchronization error compensation is performed (when bit 3
(CLP) of parameter No. 8304 for the slave axis is set to 1),
synchronization establishment is performed in the same way as
synchronization error compensation. This means that the positional
difference between the master axis and slave axis is regarded as a
synchronization error, and pulses produced by multiplying the
positional difference by a synchronization error compensation gain are
output for the slave axis. So, the parameter (No. 8334) for
specifying a synchronization error compensation gain must be set
before synchronization establishment can be performed.
If the parameter (No. 8333) for specifying a synchronization error
compensation zero width is set, no further synchronization
establishment is performed after the positional difference between the
master axis and slave axis becomes the zero width or below.
Synchronization establishment based on machine coordinates
To perform synchronization establishment when synchronization error
compensation is disabled (when bit 3 (CLP) of parameter No. 8304 for
the slave axis is set to 0), enable synchronization establishment based
on machine coordinates by setting bit 7 (SOF) of parameter No. 8303
to 1.
This method of synchronization establishment outputs the machine
coordinate difference between the master axis and slave axis as
command pulses for the slave axis to establish synchronization. A
machine coordinate difference is output at a time as command pulses.
So, if the compensation value is large, the machine abruptly makes a
large movement. Taking this into consideration, set a maximum
allowable compensation value to be used for synchronization
establishment in parameter No. 8325. As a maximum allowable
compensation value, set a maximum allowable value by which the
machine may move abruptly. If a compensation value is larger than
the value set in this parameter, an alarm (SV0001) is issued, and
synchronization establishment is not performed. Moreover, when
parameter No. 8325 is set to 0, synchronization establishment is not
performed.