Force Calculation When The Web Is Not Centered On The Roll - ABB PFEA 111 User Manual

Tension Electronics PFEA111/112, User Manual
Appendix D PFRL 101 - Designing the Load Cell Installation
D.7.2 Force Calculation when the Web is not Centered on the Roll
Load cell
PFRL 101
D-8
Use the calculations below for horizontal and inclined mounting when the web is not centered
on the roll.
The applied force at the load cell will be proportional to the distance between the tension force
center and the load cell centerline.
a
b
Tension force center
Calculation procedure:
1. Horizontal or inclined mounting?
2. Calculate F and F
R RT
Calculating Wrap Gain.
3. Use the following equations:
F for single load cell =
R
F for single load cell =
RT
F for single load cell = F
Rtot
where:
L = Distance between load cell centerline and the opposite bearing center line
a = Distance between tare force center and load cell centerline
b = Distance between tension force center and load cell centerline
L
Tare force center
, see Section D.6, Mounting Alternatives, Calculating Force and
L b –
 ----------- -
F
R
L
L a –

----------- -
F
RT
L
for single load cell + F
R
for single load cell
RT
3BSE029380R0101 Rev C