NORD Drivesystems BU0510 - Manual (Page 67)

6 Synchronous control
BU 0510 GB-3911 Subject to technical alterations 67
6.9 Flying Saw (extended synchronous operation function)
A special case of synchronous control is the "Flying Saw" mode (P610 = 4) which is available from software
version 2.0 upwards (see (P707). In addition to the actual synchronous control, the ("slave") drive must be
capable of synchronising itself to an axis which is already running. The belt drive (Master) must also be driven
by an inverter, as CAN is used for coupling, as in the case of synchronous operation.
NOTE
Use of an encoder as the master encoder is not possible! A suitable 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 ( … P425,
P470 or. P480)). The drive unit must be enabled for this.
Digital In function "64" "Start Flying Saw"
If the drive unit is in the standby position, the "Saw process" is started with a 01 flank at the "Start flying saw"
input. The input "Disable synchronous operation" must not be set. An "Enable" must be present. The drive unit
now accelerates to the position set in parameter P613[-63]. The acceleration time is calculated so that the
reference speed of the master drive (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. This is where synchronous operation starts.
Synchronous operation is signaled by the message "Drive synchronised" (P434, (P441, P450, P455) or
P481 = "27"). This signal can be used directly, for example 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 returns to position "0". The reference point can be
specified at will by means on 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 01 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.