ABB PFEA 111 - Page 47

Tension Electronics PFEA111/112, User Manual
Section 3.12.5 Set Wrap Gain
3BSE029380R0101 Rev C 3-17
• By calculation (Menu EnterWrapGain)
Wrap Gain is a scaling factor which corresponds to the ratio between Web Tension (T) and
the force component (F
R
) from web tension that is acting in the load cell measuring
direction.
The Wrap Gain range is 0.5 - 20. If you try to set the wrap gain outside this range, the
message “WrapGainTooLow” or “WrapGainTooHigh” will be shown on the display.
The wrap gain can be set with a resolution of 0.01.
Examples describing the principle of calculating Wrap Gain:
See calculation of Wrap Gain in Appendix (B, C, D, E, F or G) for installed load cell type.
T
T
T
T
T
T
F
R
F
R
F
R
F
R
= 2T F
R
= T F
R
< T
Installations where F
R
is lower than T
Wrap angle
Wrap angle
Wrap gain = 0.50
Wrap gain = = 0.50
Wrap gain =
= = 1.00
Wrap gain =
(Min. value of Wrap Gain)
Wrap gain =
Wrap gain = > 1
(Max. permitted value
Wrap gain
Wrap gain = 1.00
T
F
R
T
2T
T
F
R
T
T
T
F
R
of Wrap Gain is 20)