Lenze DSD - Manual (Page 167)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
167
7 Applications
7.15 Synchronous drive of squeegees
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7.15.2.9 Static friction coefficient of roll surface
7.15.2.10 Safety coefficient static friction
Conditions
For a reliable power transmission from the drive roll to the material the following condition has to
be met. Otherwise a warning appears.
7.15.2.11 Velocity
Symbol Description
μ
0
Static friction coefficient
• The power transmission between roll and material length is effected by friction. The coeffi-
cient of static friction specifies how great the force to be transmitted can be in proportion to
the normal force on the roll.
• Value can be entered directly or selected from the "Physical coefficients" table.
Static friction
Possible messages
 Difference of the tensile forces F
in
- F
out
> limit value ( 441)
Symbol Description
S Safety coefficient
• The differential force |F
in
-F
out
| always has to be smaller than the Static friction to prevent
slippage. The coefficient S provides for a safety reserve that can be individually adapted to
the application.
Possible messages
 Difference of the tensile forces F
in
- F
out
> limit value ( 441)
F
in
F
out
– F μ
0
1
S
100
--------- –
 
 
⋅ ⋅ <
Symbol Description
v Speed of the web
• Value is entered in the Motion dimensioning step.