GE Ecomagination AF-600 FP Programming Manual page 75

Parameter Description
AN-52 Terminal 42 Output Max Scale
Range:
100 [0 -
% 200
*
%]
3 3
Example 1:
Variable value = output frequency, range = 0–100 Hz.
Range needed for output = 0–50 Hz.
Output signal 0 mA or 4 mA is needed at 0 Hz (0% of
range). Set parameter AN-51 Terminal 42 Output Min Scale
to 0%.
Output signal 20 mA is needed at 50 Hz (50% of range).
Set parameter AN-52 Terminal 42 Output Max Scale to 50%.
Illustration 3.29 Example 1
Example 2:
Variable = feedback, range = -200% to +200%.
Range needed for output = 0–100%.
Output signal 0 mA or 4 mA is needed at 0% (50% of
range). Set parameter AN-51 Terminal 42 Output Min Scale
to 50%.
Output signal 20 mA is needed at 100% (75% of range).
Set parameter AN-52 Terminal 42 Output Max Scale to 75%.
74
Function:
Scale for the maximum output (20 mA) of the
analog signal at terminal 42.
Set the value to be the percentage of the full
range of the variable selected in
parameter AN-50 Terminal 42 Output.
Illustration 3.28 Output Current vs Reference
Variable
It is possible to obtain a value lower than 20 mA
at full scale by programming values >100% by
using a formula as follows:
20 mA/desired maximum current × 100 %
20 mA
i . e . 10mA: × 100 % = 200 %
10 mA
Example 3:
Variable value = reference, range = minimum reference–
maximum reference
Range needed for output = minimum reference (0%)–
maximum reference (100%), 0–10 mA.
Output signal 0 mA or 4 mA is needed at minimum
reference. Set parameter AN-51 Terminal 42 Output Min
Scale to 0%.
Output signal 10 mA is needed at maximum reference
(100% of range). Set parameter AN-52 Terminal 42 Output
Max Scale to 200%.
(20 mA/10 mA x 100%=200%).
Illustration 3.30 Example 3
AN-53 Terminal 42 Output Bus Control
Range:
0 % [0 - 100 %] Holds the level of output 42 if controlled by
*
AN-54 Terminal 42 Output Timeout Preset
Range:
0 % [0 -
*
100 %]
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Function:
bus.
Function:
Holds the preset level of output 42.
If a timeout function is selected in
parameter AN-50 Terminal 42 Output, the output
is preset to this level if a fieldbus timeout
occurs.
DET-620D