MG.20.B6.02 – VLT is a registered Danfoss trademark
57
VLT
®
2000 Series
Section 1
Section 2
Section 3
VLT control commands
The four control and status bytes are used to send
control commands to the frequency converter when
the telegram is sent from the master, and to send sta-
tus from the frequency converter to the master when
the telegram is returned from the VLT frequency con-
verter.
When these four bytes are used for control, they have
the following meaning:
OFF 1: Makes a normal ramp stop of the motor and
opens the relay output of the frequency
converter (relay off).
OFF 2: Makes a motor coast and opens the relay
output (relay off).
OFF 3: Same as OFF 1, but the motor makes a
quick-stop.
Bit 10: This bit has to be 1, if any of the control
commands should cause a reaction.
Control word
Byte 8
Byte 7
Byte 6
Byte 5
N
S
N
S
S
D
N
J
N
R
H
Q
M
O
O
O
O
E
O
P
P
A
O
O
O
A
O
U
O
F
F
F
T
E
E
T
G
M
L
I
T
F
F
F
F
U
F
E
E
A
F
F
P
D
C
O
U
P
U
D
D
U
1
U
K
R
3
2
1
N
N
N
N
N
S
/
C
S
C
S
S
O
C
O
C
T
S
C
/
/
/
T
E
T
E
E
T
T
F
T
O
E
T
O
I
L
I
L
L
O
F
O
P
N
O
A
O
O
O
O
E
O
E
E
V
N
N
A
P
S
N
N
N
N
C
N
C
C
A
/
/
B
T
T
T
T
L
/
L
/
I
3
2
1
/
I
O
S
E
N
1
M
L
D
N
R
T
R
G
R
S
S
E
A
R
A
E
/
B
B
/
S
R
A
M
/
V
E
T
M
P
E
2
V
T
P
E
R
A
O
N
S
L
N
A
I
I
B
N
D
L
G
E
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
1/2 byte
1/2 byte
1/2 byte
1/2 byte
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
ASCII
@
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
-
0
/
1
Note: Each byte consists of 8 bits, but the frequency converter uses only the last 4 bits.
The contr
ol possibilities of the VL
T
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