ABB DO801 digital output module
• N/m (Newton/meter)
• kN/m (kiloNewton/meter)
• kg/m (kilogram/meter)
• pli (pounds per linear inch)
If the selected unit is N/m, kN/m, kg/m or pli, the Web Width needs to be set.
Default Web Width is 2m (78,740 inch).
3.12.1.3 Set Web Width
The menu SetWebWidth will only be available when the selected unit is N/m, kN/m, kg/m or
pli.
Default Web Width is 2m (78,740 inch).
The format is XX.XXX if the width is entered in meter and XXXX.XX if the width is entered in
inch. Maximum Web Width is 50m (1968,5 inch)
3.12.1.4 Set Decimals
The number of displayed decimals can be set in this menu. The number of decimals may be set
to a number between 0 - 5 depending on the load cell nominal load and presentation unit.
Set decimals function is further explained in Section 4.6.
Figure 3-4. Set Object Menus
Use up and down keys to select type of object [ZZ] from list.
There are three object types that can be selected.
• Standard roll (if both load cell A and B are connected to the roll)
Figure 3-5. Object Type Standard Roll
• Single Side A measurement (if only load cell A is connected to the roll)
Figure 3-6. Object Type Single Side A measurement
• Single Side B measurement (if only load cell B is connected to the roll)
Figure 3-7. Object Type Single Side B measurement
When Single Side A or Single Side B measurement is selected the measured signal is multiplied
by two and presented as web tension on display and analog output.
SetObject
FastSetUp
WebTension
Presentation Menu
NominalLoad
ServiceMenu
ZeroSet
SetWrapGain
> 5 s
CurrentOutput
VoltageOutput
Miscellaneous
Menu
SetObject
ZZ
AreYouSure SetObject
[ZZ]

Figure 3-8. Nominal Load Menus
The nominal load is selected from the list below and must be the same as the nominal load on
the load cell name plate. The load cell nominal load is displayed in kN and lbs on the same row.
The following nominal loads can be selected:
Table 3-2. Nominal Loads
[kN] [lbs]
0.1 22
0.2 45
0.5 112
1.0 225
2.0 450
5.0 1125
10 2250
20 4500
50 11250
100 22500
200 45000
To be able to present actual web tension on the display, the ratio between web tension and
measured force on the load cell must be determined.
This ratio is a scaling factor called Wrap Gain.
The Wrap Gain depends on the web's wrap angle on the measuring roll and the orientation of the
load cells. Therefore, Wrap Gain depends on the actual installation.
This gives:
T (tension) = Wrap Gain FR (force of web tension in load cell measuring direction)
Figure 3-10. Wrap Gain Menus
There are two ways to find out the ratio between web tension and measured force on the load
cells, by Hanging weights or by Calculation.
• With hanging weights (Menu HangWeight)
String a rope that follows the web path exactly and apply a known weight.
The applied known weight simulates the actual web tension and the electronics measures
the resulting force on the load cells caused by the applied weight.
When both web tension (T) and the corresponding measured force (FR) are known the
tension electronics calculates the ratio T / FR and stores the value as Wrap Gain.
When web tension is applied to the roll the tension electronics calculates web tension by
multiplying the measured force on the load cells with the Wrap Gain.
After the hanging weight procedure the wrap gain calculated by the tension electronics can
be found in the EnterWrapGain menu.