Danfoss VLT AutomationDrive FC 360 Programming Manual page 14

Control
4.2.4 Process Status Data
Process status data is the process data sent from the
frequency converter and contains information about the
current state.
Slave/master
1
4 4
STW
Table 4.5 Process Status Data
PCD 1 contains a 16-bit status word, and each bit contains
information regarding a possible state of the frequency
converter.
PCD 2 contains each default value of the frequency
converter's current speed in percentage format (see
chapter 4.2.5 Reference Handling). PCD 2 can be configured
to contain other process signals.
The settings in parameter 9-16 PCD Read Configuration
define the content of PCD 3–10.
4.2.5 Reference Handling
The reference handling is an advanced mechanism that
sums up references from different sources as shown in
Illustration 4.2.
For more information on reference handling, refer to the
frequency converter's design guide.
Illustration 4.2 Reference
The reference or speed setpoint is sent via PROFINET and
is always transmitted to the frequency converter in
percentage format as integers shown in hexadecimal (0–
4000 hex).
12
PROFINET
2 3 ......
MAV PCD ......
PCD read
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The reference (MRV) and feedback (MAV) are always scaled
equally. The setting of parameter 3-00 Reference Range
determines the scaling of the reference and feedback
(MAV), see Illustration 4.3.
-100%
(C000 hex)
10
P 3-00 set to
[1] -Max to +Max
PCD
P 3-03
Max reference
P 3-00 set to
[0] Min - Max
Illustration 4.3 Reference (MRV) and Feedback (MAV), Scaled
NOTICE
When parameter 3-00 Reference Range is set to [0] Min -
Max, a negative reference is handled as 0%.
The actual output of the frequency converter is limited by
the speed limit parameters Motor Low/High Speed Limit
[RPM/Hz] in parameter 4-11 Motor Speed Low Limit [RPM] to
parameter 4-14 Motor Speed High Limit [Hz].
The final speed limit is set in parameter 4-19 Max Output
Frequency.
Table 4.6 lists the reference (MRV) and the feedback (MAV)
formats.
MRV/MAV
100%
75%
50%
25%
0%
-25%
-50%
-75%
-100%
Table 4.6 Reference/Feedback (MRV/MAV) Format
NOTICE
Negative numbers are formed as complement of 2.
NOTICE
The data type for MRV and MAV is an N2 16-bit
standardized value, expressing a range from -200% to
+200% (8001 to 7FFF).
0% 100%
(0 hex) (4000 hex)
0 P 3-03
Max reference
0% 100%
(0 hex) (4000 hex)
P 3-02 P 3-03
Min reference Max reference
Integer in hex Integer in decimal
4000 16384
3000 12288
2000 8192
1000 4096
0 0
F000 -4096
E000 -8192
D000 -12288
C000 -16384
MG06G102