Installing New Load Cell; Recalibration - Siemens SITRANS WW300 Operating Instructions Manual

7.9.2

Installing new load cell

1. Slide the new load cell into position.
2. Install the two bottom load cell mounting bolts and tighten them by hand.
The load cell should now be resting against the overload bolt.
3. Install the two top/front load cell mounting bolts. Tighten them by hand.
4. Start with the bottom load cell mounting bolts and tighten them to the torque value indicated
in the load cell instructions. Now tighten the two top/front load cell mounting bolts to the same
torque value.
5. Route the load cell cable to the junction box and connect the load cell according to the
supplied interwiring diagram.
Repeat steps for other load cells if necessary.
Note
Once the load cell has been replaced, check the weigh idler alignment with the approach
and retreat idlers.
Alignment should be +1/32" (+0.8 mm) to 0" (0 mm).
Both load cells should be within 1 mV of each other when compared, otherwise
mechanical interference is affecting the output signal. Check load cells to ensure they are
level and parallel to each other and the frame.
6. Perform a load cell balancing procedure as described in the integrator instruction manual.
7.9.3

Recalibration

1. Power up the integrator and using the appropriate integrator menu, verify that the new load
cell(s) are operating correctly.
2. Zero calibrate the unit using the integrator manual for reference. Record zero calibration
procedure results.
3. Span calibrate the unit using the integrator manual for reference. Record span calibration
procedure results.
4. Re-check zero calibration. Run another zero calibration and record the results. Verify that the
zero repeated to the same value recorded in step 2.
5. Confirm calibration with material test as described in the integrator manual, if possible, before
placing the weighfeeder back in operation.
SITRANS WW300
Operating Instructions, 05/2015, A5E33560691-AB
Commissioning
7.9 Load cell replacement
25