Lenze DSD - Manual (Page 161)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
161
7 Applications
7.14 Synchronous drive - single roll
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7.14.2.8 Safety coefficient static friction
Conditions
For a reliable power transmission from the drive roll to the material the following conditions have
to be met. Otherwise a warning appears.
• For a motor torque, i. e. F
in
> F
out
:
• For a regenerative torque, i. e. F
in
F
out
:
7.14.2.9 Velocity
Symbol Description
S Safety coefficient
• The differential force always has to be smaller than the Static friction to prevent slippage.
The safety coefficient S provides for a safety reserve that can be individually adapted to the
application.
Possible messages
 Ratio of the tensile forces F
in
/ F
out
> limit value ( 441)
 Ratio of the tensile forces F
out
/ F
in
> limit value ( 441)
F
in
F
out
------------- e
μ
0
α ⋅
1
S
100
--------- –
 
 
⋅ <
F
out
F
in
------------- e
μ
0
α ⋅
1
S
100
--------- –
 
 
⋅ <
Symbol Description
v Speed of the web
• Value is entered in the Motion dimensioning step.