Depending on the setting of
3-00 Reference Range
the
reference and MAV are scaled accordingly:
Illustration 6.2 Scaled MAV
NOTICE
If
3-00 Reference Range
is set to
[0] Min - Max
, a negative
reference will be handled as 0%.
The actual output of the frequency converter is limited by
the speed limit parameters in
4-11 Motor Speed Low Limit
[RPM]
to
4-14 Motor Speed High Limit [Hz]
.
The final speed limit is set by
4-19 Max Output Frequency
.
The reference and the MAV have the format which appears
in
Table 6.11
.
MRV/MAV
Integer in hex
Integer in decimal
100%
4000
16.384
75%
3000
12.288
50%
2000
8.192
25%
1000
4.096
0%
0
0
-25%
F000
-4.096
-50%
E000
-8.192
-75%
D000
-12.288
-100%
C000
-16.384
Table 6.11 The Format of Reference and the MAV
NOTICE
Negative numbers are formed as two's complement.
NOTICE
The data type for MRV and MAV is a N2 16 bit
standardised value, meaning it can express a range from
-200% to +200% (8001 to 7FFF).
1-00 Configuration Mode
set to
[0] Speed open loop
.
3-00 Reference Range
set to
[0] Min-Max
.
3-02 Minimum Reference
set to 100 RPM.
3-03 Maximum Reference
set to 3000 RPM.
MRV/MAV
Actual speed
0%
0 hex
100 RPM
25%
1000 hex
825 RPM
50%
2000 hex
1550 RPM
75%
3000 hex
2275 RPM
100%
4000 hex
3000 RPM
Table 6.12
6.3.4 Process Control Operation
In process control operation
1-00 Configuration Mode
is set
to
[3] Process
.
The reference range in
3-00 Reference Range
is always
[0]
Min-Max.
- MRV represents the process setpoint.
- MAV expresses the actual process feedback (range
±
200%).
6.3.5 Influence of the Digital Input
Terminals upon FC Control Mode,
8-50 Coasting Select
to
8-56 Preset
Reference Select
The influence of the digital input terminals upon control of
the frequency converter can be programmed in
8-50 Coasting Select
to
8-56 Preset Reference Select
.
NOTICE
The
8-01 Control Site
overrules the settings in
8-50 Coasting Select
to
8-56 Preset Reference Select
, and
Terminal 37
Coasting Stop (safe)
overrules any parameter.
Each of the digital input signals can be programmed to
logic AND, logic OR, or to have no relation to the
corresponding bit in the control word. In this way a
specific control command that is, stop/coast, can be
initiated by fieldbus only, fieldbus AND Digital Input, or
Ether Fieldbus OR Digital input terminal.
CAUTION
In order to control the frequency converter via
PROFINET,
8-50 Coasting Select
must be set to either
[1]
Bus
, or to
[2] Logic AND
, and
8-01 Control Site
must be
set to
[0]
or
[2]
.
More detailed information and examples of logical
relationship options are provided in
chapter 10 Trouble-
shooting
.
How to Control the Frequenc...
Operating Instructions
30
Danfoss A/S © Rev. 2014-02-27 All rights reserved.
MG90U302
6
6
Содержание VLT PROFINET MCA 120
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