Installation Instructions User guide

Bul. 937C Universal Frequency Converter Installation Instructions
Current path characteristic
The various settings have the following meaning (for setting the starting value and final value, See Start value
and final value; if you select the inverted characteristic, the conversion of starting value and final value will
be exchanged):
Setting 0 mA ... 20 mA
For this setting, the start value is converted to 0 mA and the final value to 20 mA. Intermediate values are
converted proportional.
Values less than the start value cannot be evaluated (output 0 mA). With values greater than the end value,
the output current increases linearly up to maximum 20.5 mA (102.5 % of the measuring range). Additional
overranges cannot be evaluated (output 20.5 mA).
Setting 4 mA ... 20 mA, acc. NAMUR NE 43
For this setting, the initial value is converted to 4 mA and the final value to 20 mA. Intermediate values are
converted proportional.
If the value falls lower than the start value, the output current falls linearly to a minimum of 3.8 mA (-1.25 %
of the measurement range). Additional underranges cannot be evaluated (output 3.8 mA). If the final value is
exceeded, the output current rises linearly to a maximum of 20.5 mA (roughly 103 % of the measurement
range). Additional overranges cannot be evaluated (output 20.5 mA).
20.5
20.0
0
0
100 102.5
mA
%
20.5
20.0
0
0100 103
- 1.25
4.0
3.8
mA
%
29