Lenze EVS93xx FlyingSaw - Manual (Page 23)

FlyingSaw
Features of the Prepared Solution
 Prepared Solution Servo PLC / ECSxA 1.1 EN page 2-10
2.6 Length-controlled operation
In the case of length-controlled operation, a master encoder on the material registers the
material speed of the production process. This information is processed by the controller.
Cutting marks on the material are not required. The cutting length control provides equidistant
cutting lengths. The advantage of cutting length control is that no cutting marks are required on
the material. A length calculator calculates equidistant lengths in the controller and generates a
start signal for the synchronising process.
The length calculator integrates the material speed registered by the measuring wheel or by a
digital frequency coupling. The integral, designated with length integrator in the above
illustration, starts at zero and runs against the setpoint length entered. If the setpoint length is
reached, a Boolean signal (start signal) is generated and the flying saw starts the synchronising
process. Meanwhile the length integrator is reset to the value zero, so that the next length can
be calculated.
target-length
llength-integrator
start-signal