28 • vacon
nx interface
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7
Controlling drive
NOTE: some Vacon applications may use “Bypass mode” for an enhanced implementation of “Velocity
mode” rather than for a manufacturer specific interface. Please refer to the specific application
manual for details
The Reference to the drive can be set also via manufacturer specific Process Data Object 21 (rx) when
option board is set to ByPass or ByPass 2. In the application, the value is scaled in percentage of
frequency area between the set minimum and maximum frequencies.
nx_control_word, used only with ByPass 2 mode. When ByPass mode is used, check more detailed Control
Word in the application manual
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
-
RST
DIR
RUN
In Vacon applications, the three first bits of the control word are used to control the frequency
converter. However, you can customise the content of the control word for your own applications
because the control word is sent to the frequency converter as such.
Bit
Description
Value = 0
Value = 1
0
Stop
Run
1
Clockwise
Counterclockwise
2
Rising edge of this bit will reset active fault
3….15
Not in use
Not in use
nx_speed_reference
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MSB
LSB
This is the Reference 1 to the frequency converter. Used normally as Speed reference. The allowed
scaling is –10000...10000. In the application, the value is scaled in percentage of the frequency area
between the set minimum and maximum frequencies.
Processdata_in1 … Processdata_in6
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MSB
LSB
These are application specific process data. See APPENDIX C for content of these process data in
different applications.
