
6. C–AXIS CONTROL
B–63683EN/01
116
During C–axis synchronous operation, position deviation of the C
1
–axis
and C
2
–axis is monitored. The maximum allowable position deviation
is set in parameter Nos. 16364 and 16365. If the position deviation error
for the C
1
–axis or C
2
–axis exceeds the value set in the corresponding
parameter during synchronous operation, alarm 4603 is issued.
Two parameters are provided for setting the maximum allowable position
deviation errors. One parameter is effective when nibbling is performed,
and the other when nibbling is not performed.
The positions on the C
1
–axis and C
2
–axis may be displaced relative to
each other during power–off or in the event of an emergency stop. This
function enables the correction of such displacement. After the follow–up
performed immediately after power–on, a compensation pulse signal is
output to the C
2
–axis to match the C
2
–axis machine position to that of the
C
1
–axis machine position. Note that this function is effective only when
the absolute position detection function is applied to the C–axis.
CAUTION
1 To use C–axis synchronization, set bit 4 (ACS) of parameter
No. 16360 to 1.
2 The synchronization function is enabled after a reference
position has been established.
3 A synchronization error is represented by the position
deviation on the C
2
–axis when a stop is performed. The
position deviation is indicated by the detection unit as
diagnosis No. 300. When this value exceeds the value set
in parameter No. 16368, servo alarm No. 410 is issued. This
alarm can be released by using the reset key, but the
position on the C
2
–axis will remain displaced. So, correct
the position by performing manual reference position return.
4 Synchronization is not performed when a servo alarm is
released. Perform position correction by means of manual
reference position return.
5 When the C–axis offset function is used, synchronization
may not be performed normally if an emergency stop or
reset operation is performed during C–axis movement. So,
alarm No. 4605 is issued if a C command is specified. In this
case, perform position correction by means of manual
reference position return.
6 If the position of the C
1
–axis is displaced relative to that of
the C
2
–axis, with 0° between the positions, synchronization
cannot be performed. Perform position correction by
means of manual reference position return.
Synchronization error
alarm
Synchronization