Danfoss FC 300 Design Manual page 292

FC 300 Design Guide
Conversion and Unit of measurement (index 4):
The Conversion and unit of measurement command
indicates the conversion of a parameter and the
unit of measurement. The answer to the master
is in PWE . The conversion index is in the high
LOW
byte of PWE and the unit index is in the low
LOW
byte of PWE . Conversion index is signed 8 and
LOW
unit index is unsigned 8, see the tables.
The unit index defines the "Unit of measure". The conversion index defines how the
value should be scaled to get the basic representation of the "Unit of measure". Basic
representation is where conversion index equals "0".
Example:
A parameter has a "unit index" of 9 and a "conversion index" of 2. The raw (integer) value read
is 23. This means that we have a parameter of the unit "Power" and the raw value should be
multiplied by 10 to the power of 2 and the unit is W. 23 x 10
Unit index
0
4
8
9
11
16
17
21
22
24
27
28
54
default setting ( ) display text
*
292
How to Program
Unit of measure
Dimensionless
Time
Energy
Power
Speed
Torque
Temperature
Voltage
Current
Ratio
Relative change
Frequency
Time difference w/o date
indication
[ ] value for use in communication via serial communication port
MG.33.B6.22 - VLT is a registered Danfoss trademark
Conversion index
0 1
1 10
2 100
3 1000
-1 0.1
-2 0.01
-3 0.001
67 1/60
74 3600
75 3600000
100 1
2 = 2300 W
Designation
s
h
J
kWh
W
kW
1/s
1/min (RPM)
Nm
K
°C
V
A
%
%
Hz
ms
Conversion factor
Conversion index
0
0
74
0
0
3
0
67
0
0
100
0
0
0
0
0
1*