Checking Load Cell Signal Polarity - ABB PFEA 113 User Manual

Tension Electronics PFEA113, User Manual
Chapter 3 Commissioning

3.9 Checking Load Cell Signal Polarity

3-10
This is a simple method to check that the load cells are connected to give a positive output
signal change from the tension electronics for increased web tension.
1. Push with your hand to apply a force corresponding to increased web tension on one load
cell at a time (as close to the load cell as possible) and check if the display reading is
positive. If the display reading is negative, invert the load cell signal connection to the
tension electronics.
If you don't know in which direction the force is acting:
– Connect load cells A and B with the same force direction.
– Connect load cells C and D with the same force direction.
To change the polarity of load cell A, invert X3:1 and 2 (In A+ and In A-).
To change the polarity of load cell B, invert X3:3 and 4 (In B+ and In B-).
To change the polarity of load cell C, invert X3:5 and 6 (In C+ and In C-).
To change the polarity of load cell D, invert X3:7 and 8 (In D+ and In D-).
2. After changing load cell polarity, check that the display reading is positive for increased
web tension.
NOTE
3BSE029382R0101 Rev C