Appendix
KL3403
60
Version: 3.1.0
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
Terminal type
KL3403-...
0000
0010
0014*
0020
0022**
0025
0026
0333
Nominal value
1 A
5 A
60 mV
20 mA
20 mA
250 mA
1 A
333 mV
Output for RMS value at
nominal value
1000
dec
1000
dec
25000
dec
1000
dec
4000
dec
1000
dec
1000
dec
1000
dec
*) 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
dec
) is read for each interpolation point.
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
dec
for the RMS value of the current.
Current and sampling curve for 20% overload
If the input current exceeds the rated terminal current, the terminal also outputs the value 1414
dec
for the
peak values (which are greater than the rated current times root 2). For this interpolation points a measuring
error occurs due to input overload.
