Danfoss VLT Programming Manual page 73

Parameter Description
6-51 Terminal 42 Output Min Scale
Range:
0.00 % [0.00 - 200.00
*
%]
3 3
6-52 Terminal 42 Output Max Scale
Range:
100.00 [0.00 -
% 200.00
*
%]
mA / desired maximum current × 100 %
20
20
i . e . 10 mA :
10
EXAMPLE 1:
Variable value= OUTPUT FREQUENCY, range = 0-100 Hz
Range needed for output = 0-50 Hz
Output signal 0 or 4 mA 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
72
VLT
Function:
Scale for the minimum output (0 or 4 mA)
of the analogue 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.
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 6-50 Terminal
42 Output.
Current
(mA)
20
0/4
0% Analogue Analogue Variable
100%
output Output for
Min Scale Max Scale output
par. 6-51 par. 6-52 example:
Speed
(RPM)
It is possible to get a value lower than 20 mA at
full scale by programming values >100% by
using a formula as follows:
mA
× 100 % = 200 %
mA
50%
50Hz
MG.11.CB.02 - VLT
®
HVAC Drive Programming Guide
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%
-200%
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%).
20 mA
10 mA
0/4 mA
0%
Min ref
6-53 Terminal 42 Output Bus Control
Range:
100%
0.00 % [0.00 - 100.00 %] Holds the level of Output 42 if
*
100Hz
®
is a registered Danfoss trademark
50% 75% 100%
0% +100% +200%
100% 200%
Max ref Max ref X 20/10
Function:
controlled by bus.