Operating instructions

VLT
®
2800, VLT
®
6000 HVAC and VLT
®
8000 AQUA Modbus RTU
speed reference. This may be the case, i.e. when
the speed is ramped up/down at start/stop.
Bit 08 = "1" means that the present motor speed
equals the preset speed reference.
B
it 09, Local operation/serial communication control:
Bit 09 = "0" means that OFF/STOP has been activated
on the control unit, or that the VLT 6000 HVAC is
in Hand mode. It is not possible to control the VLT
frequency converter via serial communication.
Bit 09 = "1" means that it is possible to control the
frequency converter via serial communication.
B
it 10, Out of frequency range:
Bit 10 = "0" if the output frequency has reached
the value in parameter 201 Output frequency
low limit or parameter 202 Output frequency
high limit. Bit 10 = "1" means that the output
frequency is within the limits stated.
B
it 11, Not running/running:
Bit 11 = "0" means that the motor is not running.
Bit 11 = "1" means that the VLT 6000 HVAC has a start
signal, or that the output frequency is greater than 0 Hz.
B
it 12, No function:
Bit 12 has no function.
B
it 13, Voltage warning high/low:
Bit 13 = "0" means that there is no voltage warning.
Bit 13 = "1" means that the DC voltage of the VLT 6000
HVAC intermediate circuit is too low or too high.
See the voltage limits on page 160.
B
it 14, Current limit:
Bit 14 = "0" means that the output current is smaller
than the value in parameter 215 Current limit I
LIM
.
Bit 14 = "1" means that the output current is higher
than the value in parameter 215 Current limit I
LIM
and
the frequency converter will trip after the time set in
parameter 412 Trip delay overcurrent, I
LIM
has passed.
B
it 15, Thermal warning:
Bit 15 = "0" means there is no thermal warning.
Bit 15 = "1" means that the temperature limit has been
exceeded either in the motor, in the frequency converter
or from a thermistor connected to an analogue input.
■ Serial communication reference
The serial communication reference is transmitted to
the frequency converter in the form of a 16-bit word.
The value is transmitted as whole numbers 0 - ±32767
(±200 %). 16384 (4000 Hex) corresponds to 100 %.
The serial communication reference has the
following format:
0-16384 (4000 Hex) - 0-100 % (par. 204 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’s complement.
See example.
E
xample - control word and serial communication ref.:
The frequency converter must receive 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 receive a start
command, and the reference is to be set to -50 %
(-2000 He
x) of the reference range.
The reference value is first converted to the
first complement; then 1 binary is added to
get 2’sc
omplement:
2000 Hex
=
0010 000
0 0000 0000 binary
´
1 komplement =
1101 1111
1111 1111 binary
+1binary
´
2 komplement =
1110 0000 0000 0000 binary
Control word = 047F Hex. Start command
Reference = E000 Hex. -50 % reference
MG.10.S2.02 - VLT is a registered Danfoss trademark
26