POSICON positioning control – Supplementary manual for series SK 200E and SK 250E-FDS
52 BU 0210 en-3117
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4.9.8 Flying Saw (extended synchronous operation function)
A special case of synchronous control is the "Flying Saw" mode (P610, setting 5). In addition to the
actual synchronisation control, the slave drive is able to "switch in" to a drive unit which is already
running, i.e. to synchronise its movement with the master. Use of an encoder as the master encoder is
not possible. A corresponding frequency inverter must always be used as the master.
The technology function "Flying Saw" is controlled at the slave by means of 3 digital functions
(P420...or P480). The drive unit must be enabled for this.
• Digital In function 64: "Start Flying Saw"
The enabled drive unit is in the waiting position. The "sawing process" is started with a 0 1 flank
at the input. The input "Disable synchronous operation" must not be set.
The drive unit now accelerates to the position which is set in parameter P613 [-63]. The
acceleration time is calculated so that the reference speed of the master drive (e.g. conveyor belt
drive) is attained when the target position is reached. The acceleration path remains constant
regardless of the speed of the master, so that the point at which synchronous movement begins is
always at the same position. At this point, the actual synchronous operation phase begins.
A status message (setting 27) is provided, which can be parameterised via digital output (P434) or
Bus IO Out Bit (P481). This message indicates that the synchronisation phase has been
successfully completed and that the slave is synchronised with the master. This signal can be used
for example to start the actual work process (e.g. to lower the saw or to start the "sawing process").
• Digital In function 63: "Disable synchronous operation"
Synchronous operation is maintained until a 0 1 flank is detected at the "Disable synchronous
operation" input. The sawing process is complete and the saw drive (slave) returns to position "0".
The reference point can be specified at will by means of an offset (P609). The next process can
only be started when the "zero position" has been reached. The position setpoint (P602) from the
master drive is reset with the 01 flank of "Disable synchronous operation".
• Digital In function "77": "Stop Flying Saw"
Synchronous operation is maintained until a 0 1 flank is detected at the "Stop flying saw" input.
The sawing process is complete. However, the saw drive does not return to position "0" but rather
stops. After a new flank at input "64" "Start flying saw" the slave drive once again starts to
synchronise to the master.
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