Danfoss vlt hvac drive fc 102 Operating Instructions Manual page 104

How to Programme
6-50 Terminal 42 Output
Option:
[133] Motor cur.
4-20mA
[134] Torq.0-lim 4-20
mA
[135] Torq.0-nom
4-20mA
[136] Power 4-20mA
[137] Speed 4-20mA
[139] Bus ctrl.
[140] Bus ctrl. 4-20 mA
6 6
[141] Bus ctrl t.o.
[142] Bus ctrl t.o.
4-20mA
[143] Ext. CL 1 4-20mA
[144] Ext. CL 2 4-20mA
[145] Ext. CL 3 4-20mA
NOTICE
Values for setting the Minimum Reference is found in
open loop parameter 3-02 Minimum Reference and for
closed loop 20-13 Minimum Reference/Feedb. - values for
maximum reference for open loop is found in
3-03 Maximum Reference and for closed loop
20-14 Maximum Reference/Feedb.
6-51 Terminal 42 Output Min Scale
Range:
0 % [0 - 200
*
%]
6-52 Terminal 42 Output Max Scale
Range:
100 [0 -
% 200
*
%]
102
Function:
0 - Inverter Max. Current (16-37 Inv.
Max. Current)
0 - Torque limit (4-16 Torque Limit
Motor Mode)
0 - Motor rated torque
0 - Motor rated power
0 - Speed High Limit (4-13 and 4-14)
0-100%, (0-20 mA)
0-100%
0-100%, (0-20 mA)
0-100%
0-100%
0-100%
0-100%
Function:
Scale for the minimum output (0 or 4 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 6-50 Terminal 42 Output.
Function:
Scale for the maximum output (20mA) of the
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.
VLT HVAC Drive FC 102 Operating Instructions
6-52 Terminal 42 Output Max Scale
Range:
mA / desired maximum current × 100%
20
i . e . 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%
0Hz
Illustration 6.14
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%
MG11F402 - Rev. 2013-12-16
Function:
Current
(mA)
20
0/4
0% Analogue Analogue 100% Variable
output Output for
Min Scale Max Scale output
par. 6-93 par. 6-94 example:
Speed
(RPM)
Illustration 6.13
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
× 100% = 200%
10 mA
50%
50Hz
100%
100Hz