Danfoss VLT AQUA FC 202 Operating Instructions Manual page 103

How to programme the freque...
6-52 Terminal 42 Output Max Scale
Range: Function:
100 [0 - Scale for the maximum output (20mA) of the
% 200 analog signal at terminal 42.
*
%] Set the value to be the percentage of the full
range of the variable selected in
parameter 6-50 Terminal 42 Output.
Current
(mA)
20
0/4
0% Analogue Analogue
output Output
Min Scale Max Scale
par. 6-93 par. 6-94
Illustration 5.19
It is possible to get a value lower than 20mA at
full scale by programming values >100% by using
a formula as follows:
20 mA / desired maximum current × 100%
20 mA
i . e . 10 mA :
× 100% = 200%
10 mA
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 parameter 6-51 Terminal 42 Output Min Scale to 0%
Output signal 20 mA is needed at 50 Hz (50% of range) -
set parameter 6-52 Terminal 42 Output Max Scale to 50%
20 mA
0/4 mA
0% 50%
0Hz 50Hz
Illustration 5.20
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 parameter 6-51 Terminal 42 Output Min Scale to 50%
Output signal 20 mA is needed at 100% (75% of range) -
set parameter 6-52 Terminal 42 Output Max Scale to 75%
VLT AQUA Drive FC 202 Operation Instructions
100% Variable
for
output
example:
Speed
(RPM)
100%
100Hz
MG20P402 - Rev. 2013-12-16
20 mA
0/4 mA
0% 50%
-200% 0%
Illustration 5.21
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
parameter 6-51 Terminal 42 Output Min Scale to 0%
Output signal 10 mA is needed at Max ref (100% of range)
- set parameter 6-52 Terminal 42 Output Max Scale to 200%
(20 mA/10 mA x 100%=200%).
20 mA
10 mA
0/4 mA
0%
100%
Min ref Max ref
Illustration 5.22
5.2.8 20-** Drive Closed Loop
This parameter group is used for configuring the closed
loop PID Controller, that controls the output frequency of
the frequency converter.
20-12 Reference/Feedback Unit
Option: Function:
[0] -
[1] %
[5] PPM
[10] 1/min
[11] RPM
[12] Pulse/s
[20] l/s
75% 100%
+100% +200%
5
200%
Max ref X 20/10
101
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