OHAUS VF Serie Manual De Instrucciones página 10

VF Series Floor Scales
9.2 Replacing the Load Cells
Note: Load cells can be damaged by dynamic shocks, for example. They must be replaced if the corner load
test results are not in line with the specified tolerances.
1) Set scale up on edge
2) Disconnect the load cell:

Unscrew and remove the cover of the connection box to the analogue PCB.

Detach the connecting wires of the concerned load cell from the analogue PCB.

Disconnect the respective cable gland and pull out the cable.
3) Replace the load cell:

Lay the scale upside down on a suitable surface. When doing so, ensure that the connecting cable
to the indicator is not pulled off.

Loosen two Allen screws and remove the concerned load cell.

Unhook the retaining spring at the load supports and remove the old load cell.

Hook the retaining spring to the new load cell and install the load cell.

Route the cable in the frame up to the connection box.

Insert the load supports into the cut-out of the load cell.

Re-hook the retaining spring in the load supports.
Note: When installing the replacement load cell, ensure that the screws are tightened evenly. The two
Allen screws must be tightened with a torque of 70 Nm. Use a torque spanner if possible.
4) Check Overload Stop
(2)

The distance (1) between the load frame and the overload stop must comply with the following
values:
VFP / VFS-300/600/1500
VFP / VFS-3000

The distance can be adjust by adding an available shim 0,2 mm on the load cell (2).
9.3 Connecting the Load Cells
Note: Measures for shielding against incoming and outgoing interference are especially important with a long
connecting cable. The maximum interference immunity classes will only be achieved with careful and proper
installation and wiring of all connected peripherals and scale base mechanisms.
1) As needed, shorten the new load cell cable based on the old cable
2) Attach the screw gland to cable
3) Lead cable through the hole in the housing
4) Screw nut onto threading of the cable gland
5) Connect wires
6) Screw cover onto connection box and make scale ready for operation.
Model Distance
(1)
0,4 mm
0,5 mm
EN-8