Lenze E94AxHE Technology Application Synchronism - Manual (Page 17)

EDS94TA10040xxxx EN 1.1 - 10/2008
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17
9400 Technology applications | Synchronism with mark synchronisation
Introduction
Application examples
3.9.3 Electronic gearbox as cascade
The technology application "Electronic gearbox" is often operated as cascade since
changes of speed/gearbox ratio of an upstream drive also have an effect on the
subsequent drive.
r Typical applications are, for instance, stretching machines, wire drawing machines and
roller mills.
r There is no position reference between tool and material. However, it may be required
to position the tools for maintenance work.
r The master speed is transmitted via the digital frequency or ETHERNET Powerlink.
[3-5] Electronic gearbox with real master (cascade)
r The following applies to the speed of the web in case of a cascade:
n Real master/slave 1
o Slave 2
p Digital frequency cascade (digital frequency extension module required)
i
Slave Master/Slave
d v
d v
d v
R1
R2
R3
1
2
3
i
1
i
2 3
Œ 
v
1
v
2
v
3
Ž
Digital
frequency
v
3
v
2
>
v
3
v
2
K ⋅ =