Danfoss VLT AQUA Drive FC 200 Programming Manual page 82

Parameter Description
6-50 Terminal 42 Output
Option: Function:
[143] Ext. CL 1 4-20mA 0 - 100%
[144] Ext. CL 2 4-20mA 0 - 100%
[145] Ext. CL 3 4-20mA 0 - 100%
[146] Cascade Ref.
4-20mA
[150] Out frq 0-Fmax
4-20mA
NOTE
Values for setting the Minimum Reference is found in
3-02 Minimum Reference and values for maximum reference
in 3-03 Maximum Reference.
6-51 Terminal 42 Output Min Scale
Range: Function:
0.00 % [0.00 - Scale for the minimum output (0 or 4
*
200.00 %] mA) of the analog signal at terminal 42.
Set the value to be the percentage of
the full range of the variable selected in
6-50 Terminal 42 Output.
6-52 Terminal 42 Output Max Scale
Range: Function:
100.00 [0.00 - Scale for the maximum output (20mA) of the
% 200.00 analog signal at terminal 42.
*
%] Set the value to be the percentage of the full
range of the variable selected in 6-50 Terminal
42 Output.
Current
(mA)
20
0/4
0% Analogue
output
Min Scale
par. 6-93
Illustration 3.30
It is possible to get a value lower than 20mA
at full scale by programming values >100% by
using a formula as follows:
mA / desired maximum current × 100 %
20
20 mA
i . e . 10 mA : × 100 % = 200 %
10 mA
®
VLT AQUA Drive Programming Guide
Analogue 100% Variable
Output for
Max Scale output
par. 6-94 example:
Speed
(RPM)
®
MG20O602 - VLT is a registered Danfoss trademark
EXAMPLE 1:
Variable value= OUTPUT FREQUENCY, range = 0-100 Hz
Range needed for output = 0-50 Hz
Output signal 0 or 4mA is needed at 0 Hz (0% of range) -
set 6-51 Terminal 42 Output Min Scale to 0%
Output signal 20 mA is needed at 50 Hz (50% of range) -
set 6-52 Terminal 42 Output Max Scale to 50%
20 mA
0/4 mA
0%
0Hz 50Hz
Illustration 3.31
EXAMPLE 2:
Variable= FEEDBACK, range= -200% to +200%
Range needed for output= 0-100%
Output signal 0 or 4 mA is needed at 0% (50% of range) -
set 6-51 Terminal 42 Output Min Scale to 50%
Output signal 20 mA is needed at 100% (75% of range) -
set 6-52 Terminal 42 Output Max Scale to 75%
20 mA
0/4 mA
0% 50%
-200% 0%
Illustration 3.32
EXAMPLE 3:
Variable value= REFERENCE, range= Min ref - Max ref
Range needed for output= Min ref (0%) - Max ref (100%),
0-10 mA
Output signal 0 or 4 mA is needed at Min ref - set
6-51 Terminal 42 Output Min Scale to 0%
Output signal 10 mA is needed at Max ref (100% of range)
- set 6-52 Terminal 42 Output Max Scale to 200%
(20 mA/10 mA x 100%=200%).
50% 100%
100Hz
75% 100%
+100% +200%
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