Siemens SIWAREX R Manuel d'utilisation - Page 14

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Edition 06/2009

As long as the assembly work on the scales has not been completed, the load cells

should be replaced by dummies to protect them against impact or welding currents.

CAUTION

If welding should be necessary after load cells have been installed, make

absolutely sure that the welding current is not conducted through the load cell.

The ground clamp of the welding gear should be attached directly next to the

welding point with a safe contact. The load cells must be bridged with the

grounding cable. The individual load cells must be disconnected.

Load cells may not be overloaded. The load carrier should be set down slowly. IN

load cells with low rated loads in particular there is a danger that the load cell body

could be distorted by application of force, e.g. tightening lock nuts.

WARNING

The bearing is statically indefinite in the case of more than three load cells or

application points. The force application points should be at the same height. The

output signals of all load cells should be approximately the same at even load or

correspond to the load distribution in the case of uneven load. Proceed as follows

to measure the load on the load cells:

•

Disconnect load cell cables SIG+ and SIG-.

•

Supply load cells with the feed voltage (e.g. 10.2V).

•

Measure the output voltages between SIG+ and SIG- of the individual load

cells.

The measured voltage corresponds in proportion to the product of

characteristic value times supply voltage to the weight percentage at the

rated load which is applied to the load cell.

Example:

Calculation: 4mV / (10,2V x 2mV/V) = 0.196

Result:

Spacer plates should be placed beneath the load cell with the lowest value until the

output voltages are adjusted equally.

The load cell seat must be horizontal, completely level and, like the load cell base,

absolutely clean.

The contact surfaces of the force applications must be lubricated with high-

performance grease.

SIWAREX R Load Cells Operating Manual

A5E00159640

Suitable lifting gear must be used for lifting the load carrier. The

appropriate safety regulations must be observed.

feed voltage

characteristic value

rated load

output voltage

0.196 x 5t = 0.98t

The load cell is loaded with 0.98t

Installation/Assembly

10.2V

2mV/V

max

4mV