Danfoss VLT AutomationDrive FC 301 Programming Manual page 118

Parameter Descriptions
6-50 Terminal 42 Output
Option:
3 3
[134] Torq.% lim
4-20 mA
[135] Torq.% nom
4-20mA
[136] Power
4-20mA
[137] Speed
4-20mA
[138] Torque
4-20mA
[139] Bus ctrl. 0-20
mA
[140] Bus ctrl. 4-20
mA
[141] Bus ctrl
0-20mA t.o.
[142] Bus ctrl
4-20mA t.o.
[147] Main act val
0-20mA
[148] Main act val
4-20mA
[149] Torque %
lim 4-20mA
116
®
VLT
Function:
Example: Inverter normal current (11 kW) is
24 A. 160% = 38.4 A. Motor normal current
is 22 A, the readout is 11.46 mA.
16 mA x 22 A
+ 4 mA = 13 . 17 mA
38 . 4 A
In case the normal motor current is equal to
20 mA, the output setting of
parameter 6-52 Terminal 42 Output Max Scale
is:
I x 100
38 . 4 x 100
VLT
Max = = 175 %
I 22
Motor
Norm
The torque setting is related to the setting
in parameter 4-16 Torque Limit Motor Mode.
The torque setting is related to the motor
torque setting.
Taken from parameter 1-20 Motor Power
[kW].
Taken from parameter 3-03 Maximum
Reference. 20 mA = value in
parameter 3-03 Maximum Reference.
Torque reference related to 160% torque.
An output value set from fieldbus process
data. The output works independently of
internal functions in the frequency
converter.
An output value set from fieldbus process
data. The output works independently of
internal functions in the frequency
converter.
Parameter 4-54 Warning Reference Low
defines the behavior of the analog output in
case of fieldbus timeout.
Parameter 4-54 Warning Reference Low
defines the behavior of the analog output in
case of fieldbus timeout.
Analog output at 0 torque is 12 mA.
Motoring torque increases the output
current to maximum torque limit 20 mA (set
in parameter 4-16 Torque Limit Motor Mode).
Generating torque decreases the output to
torque limit in generator mode (set in
parameter 4-17 Torque Limit Generator Mode)
Example: Parameter 4-16 Torque Limit Motor
Mode = 200% and parameter 4-17 Torque
Limit Generator Mode = 200%. 20 mA =
200% motoring and 4 mA = 200%
generating.
Danfoss A/S © 01/2018 All rights reserved.
AutomationDrive FC 301/302
6-50 Terminal 42 Output
Option:
[150] Max Out Fr
4-20mA
[158] Motor Volt.
0-20mA
[159] Motor Volt.
4-20mA
6-51 Terminal 42 Output Min Scale
Range:
0 % [0 -
*
200 %]
6-52 Terminal 42 Output Max Scale
Range:
100.00 [0.00 -
% 200.00 %
*
]
20 mA/desired maximum current x 100 %
20
i . e . 10 mA : x 100 = 200 %
10
Illustration 3.45 Output Max. Scale
Function:
0mA 4mA 12 mA
Par 4-17 0% Torque
(200%)
Illustration 3.44 Torque Limit
0 Hz = 0 mA, parameter 4-19 Max Output
Frequency = 20 mA.
Function:
Scale for the minimum output (0 mA 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 the maximum output of the selected
analog signal at terminal 42. Set the value
to the maximum value of the current signal
output. Scale the output to give a current
lower than 20 mA at full scale; or 20 mA at
an output below 100% of the maximum
signal value. If 20 mA is the required output
current at a value 0–100% of the full-scale
output, program the percentage value in
the parameter, that is 50% = 20 mA. If a
current 4–20 mA is required at maximum
output (100%), calculate the percentage
value as follows:
Current
(mA)
20
0/4
0% Analogue Analogue 100% Variable for
output
output Output
example:
Min Scale Max Scale
Speed (RPM)
par. 6-51 par. 6-52
20 mA
Par 4-16
(200%)
MG33MO02