Lenze DSD - Manual (Page 218)

7 Applications
7.22 Winding drive for rewinder/unwinder
218
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
7.22.6.6 Medium material density
7.22.6.7 Min. material thickness (rewinder)
If paper is used as material, usually only the grammage [g/m 2 ] is known.
Conversion from grammage [g/m 2 ] to material thickness [s]:
Example:
7.22.6.8 Min. material thickness (unwinder)
7.22.6.9 Coil and winding shaft moment of inertia
Symbol Description
ρ Specific density of winding material
• Value can be entered directly or selected from the "Physical coefficients" table.
Density of winding material
Symbol Description
s
min
If different material thicknesses are used, the smallest material thickness must be entered
(worst case).
• DSD uses this value to calculate the increase in diameter during the acceleration phase start-
ing from the min. reel diameter (standstill) to the dimensioning diameter (max. speed).
s Material thickness [mm]
m Grammage [g/m 2 ]
ρ Density [kg/dm 3 ]
• Paper: ρ = 0.9 kg/dm 3
 Tables of values ( 423)
m 80 g/m 2
ρ 0.9 kg/dm 3
s
m
ρ 1000 ⋅
--------------------- =
s
80
0.9 1000 ⋅
------------------------- 0.088 mm = =
Symbol Description
s
min
If different material thicknesses are used, the smallest material thickness must be entered
(worst case).
• DSD uses this value to calculate the decrease in diameter during the braking phase starting
from the dimensioning diameter (max. speed) to the min. reel diameter (standstill).
Symbol Description
J
Cor
Moment of inertia of the empty coil and winding shaft / coil intake
• Value can be entered directly or calculated using the inertial calculator.
Inertial calculator ( 407)