
B–63683EN/01
6. C–AXIS CONTROL
115
The C–axis synchronization control function enables operation of the
punch section of the die in sync with the die section of the die by using
a separate servo motor for each section. C–axis synchronization control
simultaneously issues the same command to both servo motors. So,
synchronization error correction, normally required to detect and reduce
deviation between the two servo motors during synchronous operation,
is not applied.
In C–axis synchronization control, the master axis is referred to as the
C
1
–axis, and the slave axis as the C
2
–axis.
When C–axis synchronization control is applied, the C
2
–axis
immediately follows the C
1
–axis in any case. So, be particularly careful
when making a connection to the machine.
Example 1: When the C
1
–axis is the third axis → C
2
–axis: Fourth axis
Example 2: When the C
1
–axis is the fifth axis → C
2
–axis: Sixth axis
When C–axis synchronization control is applied, the same increment
system, maximum values, and so forth, as used for ordinary C–axis
control, are used. The C
1
–axis and C
2
–axis are controlled by
programmed C commands.
In manual reference position return, C–axis synchronization control is not
applied, but a reference position return operation is independently
performed for each of the C
1
–axis and C
2
–axis. A deceleration signal for
reference position return and a reference position return completion signal
are provided separately for the C
1
–axis and C
2
–axis, so that reference
position return is performed in the ordinary way. Each signal is provided
for each axis number.
Create a sequence on the PMC side so that synchronous operation is
enabled when the reference position return completion signals for both
the C
1
–axis and C
2
–axis are set to 1.
CAUTION
Upon power–on, emergency stop, or servo alarm release,
the machine positions for the C
1
–axis and C
2
–axis will shift.
In such cases, therefore, always perform manual reference
position return to correct the machine positions.
When C–axis synchronization control is applied, jog feed, incremental
feed, and handle feed cannot be performed. Synchronous operation,
however, is enabled by setting synchronization control signal SYNCJn
<G140> (n: Axis number of the C
2
–axis) to 1. In this case, synchronous
operation is performed by issuing commands to the C
1
–axis only; no
commands can be issued to the C
2
–axis.
6.2
C–AXIS
SYNCHRONIZATION
CONTROL
General
Axis configuration
Command
Manual reference
position return
Manual operation