Pressductor Pillowblock Load Cells Vertical Measuring PFCL 201 User manual

 • The screws that secure the load cell must be tightened with a torque wrench.

 • The bearing arrangement for the measuring roll must be designed to allow axial expansion of the roll with changes in temperature.

 • Any drive to the roll must be applied in such a way that interfering forces from the drive are kept to a minimum.

 • The measuring roll must be dynamically balanced.

 • The mounting surfaces of the load cells must be on the same height and parallel with the measuring roll.

 • In a corrosive environment, galvanic corrosion may occur between the load cell, galvanized screws and adapter plates. This makes it necessary to use stainless steel screws and adapter plates of stainless steel or equivalent. See adapter plates in

Unpacking

When the equipment arrives, check against the delivery document. Inform ABB of any complaint, so that errors can be corrected immediately and delays avoided.

Preparations

Prepare the installation in good time by checking that the necessary documents and material are available, as follows:

• Installation drawings and this manual.

• Standard tools, torque wrench and instruments.

• Rust protection, if additional protection is to be given to machined surfaces. Choose TEC TYL 511 (Valvoline) or FERRYL (104), for example. 

• Load cells, adapter plates, bearing housings, etc.

• Locking fluid (medium strength) to lock mounting screws. 

• Screws as listed in Table 3. page 19 and Table 4. page 19 to secure the load cell, and other screws for bearing housings etc.

Mounting

The instructions below apply to a typical mounting arrangement. Variations may be allowed, provi ded that the requirements of  3.1 General  are complied with.

1. Clean the foundation and other mounting surfaces.

2. 2. Fit the lower adapter plate to the load cell. Tighten the screws to the torque stated in Table

3. 3. page 19 or Table 4. page 19. 3. Fit the load cell and the lower adapter plate to the foundation, but do not fully tighten the screws.

4. 4. Fit the upper adapter plate to the load cell, tighten to the torque stated in Table 3. page 19 or Table 4. page 19.

5. 5. Fit the bearing housing and the roll to the upper adapter plate, but do not fully tighten the screws.

6. 6. Adjust the load cells so that they are in parallel with each other and in line with the axial direction of the roll. Torque tighten the foundation screws.

7. 7. Adjust the roll so that it is at right angles to the longitudinal direction of the load cells.Torque tighten the screws in the upper adapter plate.

8. 8. Apply rust protection to any machined surfaces that are not rust proof.

Cabling for Load Cell PFCL 201CE

Cabling with protective hose shall be mounted so that the forces related to the weight of the cable/ hose do not act in the measuring direction of the load cell. A cable clamp is therefore necessary. If the load cell is prevented from movement in the measuring direction- it will shunt force, and the measured force will differ from the actual.

The favourable direction of the cable/hose is the horizontal direction to the left or right as indicated in Figure 16. Position of cable from factory page 20. This as possible forces in the longitudinal direction of the cable/hose due to temperature, will act perpendicular to the measuring direction of the load cell (the direction in which the load cell is insensitive to loads).

For achievable cable directions, see Figure 17. Possible directions of cable for PFCL 201CE page 21. The direction of the cable and protective hose can be changed by unscrewing the two screws in the connection box and turning the cable to a suitable direction. Make sure to re-install the screws in the connection box.

General

The actual procedure for commissioning a load cell is simple, provided that the load cells and cables have been properly installed. Commissioning of the control unit is described in the relevant chapter of the control unit manual.

Check the following:

• that the load cells have been correctly installed and aligned 

 • that all screws have been tightened to the correct torque 

 • that all cables are correctly installed and connected 

 • that all connectors are plugged in

Preparatory Calculations

To be able to set the correct measuring range, the measurement force per load cell FR/2 at maxi mum tension T must be calculated. Each load cell is subjected to half the total measurement force FR. This calculation must be done before commissioning can begin. Calculation of FR is described in 2.5 Mounting Arrangement.

Maintenance

General

Strip Tensiometer Systems with Pressductor® load cells are extremely reliable and do not require daily servicing. As a preventive measure, checks should be done periodically on all parts subject to mechanical wear.

Preventive Maintenance

Check mounting screws and tighten if necessary.

The gaps between load cell and plates should be checked to ensure that they do not get clogged with dirt, causing shunt force past the load cell. Clean the gaps with compressed air if necessary. The cable between the load cell and the junction box is subjected to possible damage and should be checked and replaced if necessary.