Danfoss VT2800 Series Design Manual page 117

Bit 05, ON 3/OFF 3:
Bit 05 = '0' means that Bit 02 in the control word = '1'.
Bit 05 = '1' means that Bit 02 in the control word = '0'.
Bit 06, Start enable/start disable:
Bit 06 = '1' after reset of a trip, after acti v ation of OFF2
or OFF3 and after connection of mains voltage. Start
disable is reset by setting Bit 00 in the control word
to '0', and Bit 01, 02 and 10 are set to '1'.
Bit 07, Warning:
See description under Status word according
to FC protocol.
Bit 08, Speed:
See description under Status word according
to FC protocol.
Bit 09, No warning/warning:
See description under Status word according
to FC protocol.
Bit 10, Speed ≠ ref/speed = ref.:
See description under Status word according
to FC protocol.
Bit 11, Running/not running:
See description under Status word according
to FC protocol.
Bit 13, Voltage warning high/low:
See description under Status word according
to FC protocol.
Bit 14, Current limit:
See description under Status word according
to FC protocol.
Bit 15, Thermal warning:
See description under Status word according
to FC protocol.
Serial communication reference
The serial communication reference is transferred to
the frequency converter as a 16-bit word. The value is
transferred in whole numbers 0 - ±32767 (±200%).
16384 (4000 Hex) corresponds to 100%.
MG.28.E9.02 - VLT is a registered Danfoss trademark
®
VLT 2800 Series
The serial communication reference has the following
format: 0-16384 (4000 Hex)
Minimum ref. - Par. 205 Maximum ref.).
It is possible to change the direction of rotation via the
serial reference. This is done by converting the binary
reference value to 2' complement. See example.
Example - Control word and serial communication ref.:
The frequency converter is to recei v e a start
command and the reference is to be set to 50%
(2000 Hex) of the reference range.
Control word = 047F Hex ⇒ Start command.
Reference = 2000 Hex ⇒ 50% reference.
The frequency converter is to recei v e a start
command and the reference is to be set to -50%
(-2000 Hex) of the reference range.
The reference value is first converted to 1' complement,
and then 1 is added binarily to obtain 2' complement:
2000 Hex 0010 0000 0000 0000 0000
1' complement 1101 1111 1111 1111 1111
2' complement 1110 0000 0000 0000 0000
Control word = 047F Hex ⇒ Start command.
Reference = E000 Hex ⇒ -50% reference.
Present output frequency
The value of the frequency converter's present output
frequency is transferred as a 16-bit word. The value is
transferred as whole numbers 0 - ±32767 (±200%).
16384 (4000 Hex) corresponds to 100%.
0-100% (Par. 204
+ 1
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