Danfoss VLT 3000 Series Product Manual page 80

Serial data interface,
group 5..
(continued)
80
Groups
Response telegram from VLT
Function
Start byte
Address
Control character
Control/status word
Parameter no.
Sign
Data value
Comma
Check sum
Stop byte
Check sum: Byte 2-19 = 1007 reduced to 07
Status word equivalent to the example on p. 79.
Fault reports parameters (read/write)
Byte 19 in the response telegram from the
VLT ® frequency converter assumes the
value 9 if it is not possible to perform the
selected write or read command, and
simultaneously a reason code is given in
bytes 17 and 18. The following reason
codes are found:
Switch 04:
The drawing on p. 147 shows the position
of switch 04.
04 closed: Terminal 61 is connected
directly to earth.
04 open: Terminal 61 is connected to
earth via an RC link.
When switch 04 is closed, there is no
galvanic separation between the signal
cables (terminals 68 and 69) and earth,
®
MG.30.A7.02 - VLT is a registered Danfoss trademark
®
frequency converter to master (PC or PLC)
Byte no. ASCII character
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Code
00
01
02
03
04
05
06
07
08
99
which can give problems if a master
without galvanic separation is used.
Therefore the following connection method
should be used: Switch 04 must be open,
the signal cable's screen must be con-
nected to the relief stirrup below the control
card, but not to terminal 61.
The screen is uncovered and clamped
under the relief stirrup, the screen may not
end at the relief stirrup, but must be led as
close to the terminal block as possible, so
that the unscreened signal cable ends are
as short as possible.
Decimal value
< 60
0 48
1 49
U 85
G 71
H 72
K 75
@ 64
0 48
5 53
1 49
6 54
+ 43
0 48
0 48
0 48
8 56
0 48
0 48
0 48
7 55
> 62
Reason
Parameter number does not exist
There is no read/write access to
the selected parameter
A non-existent index no. has
been selected
Index reading is used for a
parameter which does not
have indexes
The parameter is read-only.
Can be because factory setup has
been selected
The parameter cannot be changed
when the motor is running
The data value is outside the
parameter's range
Illegal comma value (byte 19)
The read data value > 99999
Other faults