Corner Load Balancing - HBM VKK2R-8 Ex Bedienungsanleitung

VKK2R-8 Ex
6

Corner load balancing

With weighing machines, mechanical imbalance may lead to corner load
errors. According to the EN 45501 3.6.2 standard for non-automatic weighing
machines, specific values are to be maintained for eccentric loading.
The junction boxes provide an easy way to compensate for these errors
electrically. A binary−stepped network of 4 resistors is available for each load
cell, that is shorted at the factory via 0 Ω resistors (see Fig. 6.1). Opening the
vertical 0 Ω resistors activates the relevant resistances and thus reduces the
load cell signal.
Input:
Load cells 1 ... 8
8
0.22 Ω 0.22 Ω
0.39 Ω 0.39 Ω
0.82 Ω 0.82 Ω
1.50 Ω 1.50 Ω
3.00 Ω 3.00 Ω
Fig. 6.1: Resistor network for corner load balancing of 8 load cells
Opening the equipment while in operation is only permissible in the case of
the "intrinsic safety" type of protection. In the case of other types of protection,
a Hot Work Permit from the operator's side is required for work on the
equipment.
A1552-4.1 en/de
7 2 1
0.22 Ω 0.22 Ω
0.39 Ω 0.39 Ω
0.82 Ω 0.82 Ω
1.50 Ω 1.50 Ω
3.00 Ω 3.00 Ω
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Output:
Amplifier
Sense (+)
Excitation (+)
Excitation (−)
Sense (−)
Signal (−)
Signal (+)
HBM