Danfoss VLT 2800 Series Operating Instructions Manual page 22

Bit 11, Running/not running:
Bit 11 = '0' means that the motor is not running.
Bit 11 = '1' means that the frequency converter
has a start signal or that the output frequency
is greater than 0 Hz.
Bit 13, Voltage warning high/low:
Bit 13 = '0' means that there are no voltage warnings.
Bit 13 = '1' means that the DC voltage in the frequency
converter's intermediate circuit is too low or too high.
Bit 14, Current limit:
Bit 14 = '0' means that the output current is less than
the value in parameter 221 Current Limit I
Bit 14 = '1' means that the output current is greater than
the value in parameter 221 Current LimitI
frequency converter will trip after a set period of time.
Bit 15, Thermal warning:
Bit 15 = '0' means that there is no thermal warning.
Bit 15 = '1' means that the temperature limit has been
exceeded in either the motor, frequency converter or
from a thermistor that is connected to a digital input.
å Serial communication reference
The serial communication reference is transferred to
the variable frequency drive as a 16-bit word. The value
is transferred in whole numbers 0 - ±32767 (±200%).
16384 (4000 Hex) corresponds to 100%.
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 variable frequency drive is to receive a start
command and the reference is to be set to 50%
(2000 Hex) of the reference range.
Control word = 047F Hex
Reference = 2000 Hex
22
VLT® Serie 2800 and VLT® Serie 6000 Modbus RTU
.
LIM
and that the
LIM
0-100% (Par. 204
Start command.
50% reference.
The variable frequency drive is to receive 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
1' complement
2' complement
Control word = 047F Hex
Reference = E000 Hex
å Present output frequency
The value of the variable frequency drive'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%.
Output frequency has the following format:
0-16384 (4000 Hex)
Output frequency low limit - Par. 202 Output
frequency high limit).
Example - Status word and current output frequency:
The master receives a status message from the variable
frequency drive that the current output frequency
is 50% of the output frequency range.
Par. 201 Output frequency low limit = 0 Hz
Par. 202 Output frequency high limit = 50 Hz
Status word = 0F03 Hex.
MG.10.S1.22 - VLT is a registered Danfoss trademark
0010 0000 0000 0000 0000
1101 1111 1111 1111 1111
1110 0000 0000 0000 0000
Start command.
-50% reference.
0-100% (Par. 201
+ 1