Measuring Error Due To Input Overload - Beckhoff KL3403 Series Documentation

Appendix
6.2

Measuring error due to input overload

The various variants of the KL3403 differ only in terms of input configuration. The output value for the
nominal value (full scale) is the same for most variants (see process data [} 46]).
Terminal type
Nominal value
Output for RMS value at
nominal value
*) for KL3403-0014: three additional voltage circuits instead of the current circuits: 60 mV for connection of
external shunts
**) for KL3403-0022: three additional current circuits instead of the voltage circuits: also 20 mA
Current and sampling curve for input signals within the permitted measuring range
If the current input values are within the permitted range, i.e. not above the rated current for the terminal, a
valid measured value (≤ 1414
Fig. 29: Current and sampling curve for input signals within the permitted measuring range
In the example shown (full scale), the terminal outputs the value 1000
Current and sampling curve for 20% overload
If the input current exceeds the rated terminal current, the terminal also outputs the value 1414
peak values (which are greater than the rated current times root 2). For this interpolation points a measuring
error occurs due to input overload.
60
KL3403-...
0000 0010 0014*
1 A 5 A 60 mV
1000 1000 25000
dec dec
) is read for each interpolation point.
dec
Version: 3.1.0
0020 0022**
20 mA 20 mA
1000 4000
dec dec dec
for the RMS value of the current.
dec
0025 0026 0333
250 mA 1 A 333 mV
1000 1000 1000
dec dec
for the
dec
KL3403
dec