FC 300 Design Guide
How to Program
Conversion and Unit of measurement (index 4):
The Conversion and unit of measurement comma nd
indicates the conversion of a parameter and the
unit of measurement. The answer to the master
is in PWE
LOW
. The conversion index is in the high
byte of P WE
LOW
and the unit index is in the low
byte of PWE
LOW
. Conversion index is sign ed 8 and
unit index is unsigned 8, see the tables.
Conversion index Conversion factor
01
110
2 100
3 1000
-1 0.1
-2 0.01
-3 0.001
67 1/60
74 3600
75 3600000
100 1
The unit index defines the "Unit of measure". The conversion index defines how the
value should be scaled to ge t the basic representation of the "Unit of measure". Basic
representation is wh ere conversion index equa ls "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 1 0
2
= 2300 W
Unit index Unit of measu re Designa tion Conversion index
0 Dimensionless 0
s0
4Time
h74
J0
8Energy
kWh
W0
9Power
kW 3
1/s 0
11 Speed
1/min (RPM) 67
16 Torque Nm 0
K0
17 Tem p erature
°C 100
21 Voltage V 0
22 Curren t A 0
24 Ratio % 0
27 Relative change % 0
28 F req uency Hz 0
54
Time difference w/o date
indication
ms 1*
*
default setting ()display text []value for use in communication via serial communication port
292
MG.33.B
6.22 - V LT is a registered Danfoss trademark
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