Control Word Bit Descriptions Vlt 6000 - Danfoss VLT 2800 Series Operating Instructions Manual

Output frequency= 2000 Hex
range, corresponding to 25 Hz.
å Control Word Bit Descriptions VLT 6000
The control word is used for transmitting commands
from a master (e.g. a PC) to a slave.
Bit Bit = 0
00
01
02 DC braking
03 Coasting stop
04 Quick stop
05 Freeze output frequency
06 Ramp stop
07
08
09 No function
10 Data not valid
11
12
13
14
15
Bit 00/01:
Bits 00 and 01 are used for choosing between the four
pre-programmed references (parameters 211- 214
Preset reference) in accordance with the following table:
Preset ref. Parameter
1 211
2 212
3 213
4 214
NOTE
Parameter 508 Choice of preset reference
is used to choose how bits 00/01 are
to be gated with the corresponding
functions of the digital inputs.
Bit 02, DC BRAKE:
MG.10.S1.22 - VLT is a registered Danfoss trademark
VLT® Serie 2800 and VLT® Serie 6000 Modbus RTU
50% of the frequency
Bit =1
Preset ref. lsb
Preset ref. msb
Start
Reset
Jog
No function
Data valid
Activate relay 1
Activate relay 2
Choice of setup lsb
Choice of setup msb
Reversing
Bit 01 Bit 00
0 0
0 1
1 0
1 1
Bit 02 = 0 leads to DC braking and stop. Set
braking current and duration in parameter 114 DC
braking current and in parameter 115 DC braking
time. Note: Parameter 504 DC brake is used
for selecting how bit 02 is to be gated with the
corresponding function of terminal 27.
Bit 03, Coasting stop:
Bit 03 = "0" means that the AFD immediately "lets go"
of the motor (the output transistors are "turned off"),
which means that the motor runs freely until it stops.
Bit 03 = "1" means that the AFD is able to start the
motor, provided the other conditions for starting are
fulfilled. Note: In parameter 503 Coasting stop the
choice is made of how bit 03 is to be gated with
the corresponding function of terminal 27.
Bit 04, Quick stop:
Bit 04 = "0" leads to a stop in which the motor
speed is ramped down to stop via parameter
207 Ramp-down time.
Bit 05, Freeze output frequency:
Bit 05 = "0" means that the given output frequency (in
Hz) is frozen. The frozen output frequency can now
only be changed via the digital inputs programmed
for Speed up and Speed down.
NOTE
If Freeze output is active, the AFD cannot be
stopped via Bit 06 Start or via terminal 18. The
AFD can only be stopped in the following ways:
• Bit 03 Coasting stop
• Terminal 27
• Bit 02 DC braking
• Terminal 19 programmed for DC braking
Bit 06, Ramp stop/start:
Bit 04 = "0" leads to a stop in which the motor
speed is ramped down to stop via parameter
207 Ramp-down time.
Bit 06 = "1" means that the AFD is able to start the
motor, provided the other conditions for starting are
fulfilled. Note: In parameter 505 Start a choice is made
of the way bit 06 Ramp stop/start is to be gated with
the corresponding function of terminal 18.
Bit 07, Reset:
Bit 07 = "0" leads to no reset.
Bit 07 = "1"means that a trip is reset.
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