Input Scaling/Linearization; Transducer Connections - ABB REF 54 Series Technical Reference Manual, General

1MRS750527-MUM
5.1.9.5.
5.1.9.6.
Feeder Terminal
Technical Reference Manual, General

Input scaling/linearization

The user can scale each RTD/analog input linearly or non-linearly by constructing a
separate linearization curve for each input. The name implies the typical use, that is,
the linearization of not directly supported non-linear sensors. The curve consists of
at least two points (for linear scaling) and up to ten points, where the x-axis of the
curve is 0 to 1000 per mille of the range selected for the input, and the y-axis is the
scaled absolute value of the input. The linearization curves can be enabled and
disabled with the Linear. curve parameter in the menu
Configuration/RTD1/Input #.
Parameter
Linear.curve
The curve is constructed for the transformer terminal by using the Transducer
Linearization Tool (TLT) in the CAP 505 relay tool package.
When the linearization curve is enabled, the Input high limit and
Input low limit parameters define the scaled range instead of the range
selected by the original range parameters. The range of the scaled input is defined as
the range between the smallest y-axis value and the largest y-axis value.

Transducer connections

The RTD/analog inputs may be connected to a large variety of different measuring
transducer types, both standardized and customer-specified types.
Three connection screws have been reserved for each channel. Further, one
connection screw (analog ground) has been reserved per every two channels.
Two earth terminals (see Fig. 5.1.9.6.-1 ), located to the left of the connectors, are
reserved for connecting the protective sheaths of the transducer input cables. The
cable sheath is generally earthed in one end of the cable only.
Fig. 5.1.9.6.-1 Earth terminals
1. This feature is supported in feeder terminal revisions of Release 3.0 or later.
1
Values Default
0=Disabled Disabled
1=Enabled
REF 54_
A050201
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