Parallel Connection; Emc Protection - HBM Z16A Bedienungsanleitung

7.5

Parallel connection

Important
When connecting load cells in parallel, the cables between the load cells and
the terminal box in which they are to be interconnected must be identical and
of the same length: Different cable lengths or types between the terminal box
and load cells can not be compensated by the six-wire configuration. Either fit
all load cells with the same cable type and length, or shorten all cables to the
same length. Otherwise you will have to calculate correction resistances in
order achieve identical circumstances for the individual load cells.
Only load cells with an aligned output (nominal (rated) sensitivity and output
resistance) are suitable for parallel connection. This is the case for the type
Z16A... load cells. The load cells can be wired in parallel by joining the load cell
cable core ends of the same color. The type VKK terminal boxes or the
VKK2R-8 Ex version for potentially explosive areas are available in the HBM
product line for this purpose. The output signal is then the average of the
individual output signals.
Important
Overloading in an individual load cell cannot then be detected from the output
signal after load cells have been connected in parallel.
7.6

EMC protection

Important
The load cells with shielded, round cables are EMC-tested in accordance with
EC directives and identified by CE certification. However, you must connect the
shield of the connection cable extensively on the shielding electronics
enclosure in order to achieve EMC protection for the measuring chain.
Z16A
A04000_03_Y00_00 HBM: public
Electrical connection
15