Danfoss VLT AutomationDrive FC 301 Programming Manual page 172

Parameter Descriptions
6-70 Terminal X45/1 Output
Option:
3 3
[134] Torq.% lim
4-20 mA
[135] Torq.% nom
4-20mA
[136] Power 4-20mA Taken from parameter 1-20 Motor
[137] Speed 4-20mA Taken from
[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.
[149] Torque % lim
4-20mA
[150] Max Out Fr
4-20mA
170
®
VLT AutomationDrive FC 301/302
Function:
The inverter maximum current
(160% current) is equal to 20 mA.
Example: Inverter normal current
(11 kW) = 24 A. 160% = 38.4 A.
Motor normal current = 22 A,
readout 11.46 mA.
16 mA x 22 A
= 9 . 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.
Power [kW].
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 a fieldbus
timeout.
Parameter 4-54 Warning Reference
Low defines the behavior of the
analog output in case of a fieldbus
timeout.
In relation to parameter 4-19 Max
Output Frequency.
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6-71 Terminal X45/1 Min. Scale
Range: Function:
0 % [0 - 200 %] Scale the minimum output of the
*
selected analog signal at terminal
X45/1 as a percentage of the
maximum signal value. For example,
if 0 mA (or 0 Hz) is required at 25%
of the maximum output value, then
program 25%. Scaling values up to
100% can never exceed the
corresponding setting in
parameter 6-72 Terminal X45/1 Max.
Scale.
6-72 Terminal X45/1 Max. Scale
Range: Function:
100 % [0 - 200 %] Scale the maximum output of the
*
selected analog signal at terminal
X45/1. 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 between
0–100% of the full-scale output,
program the percentage value in
the parameter, for example 50% =
20 mA. If a current 4–20 mA is
required at maximum output
(100%), calculate the percentage
value as follows (example where
required maximum output is
10 mA):
I
DESIRED MAX
20 − 4 mA
=
Current
[mA]
20
0/4
Analogue Analogue
0%
output Min Output Max
Scale Scale
par. 6-71 par. 6-72
Illustration 3.46 Output Maximum Scale
I mA
RANGE
x 100 %
mA
x 100 % = 160 %
10 mA
Variable for
100%
output
example:Speed
[RPM]
M0013101