Danfoss LonWorks Option Card, Инструкция по эксплуатации

Страница: 36 / 44

35
MG.60.N1.22 - VLT is a registered Danfoss trademark
VLT
®
5000 / VLT
®
6000 HVAC / VLT
®
8000 AQUA
Parameter Access Error Codes
Exception Code Interpretation
1 Illegal function for the addressed node
2 Illegal data address (i.e., illegal parameter number)
3 Illegal data value
6 Busy
Example 1:
The examples below demonstrate use of the
parameter access command and parameter
access response functions of the controller
node. In the examples, the controller node has
a
parameter access command SNVT_preset
called nvoParamCmd and a parameter
access response SNVT_preset called
nviParamResp. In writing to the drive correctly,
the access response simply repeats the
entered data. In the event of an error, an error
code is displayed in value [3]. See
Parameter
Access Error Codes above.
Parameter
Access
Error Codes
In the event of an error message in response
to a
Parameter access command (see VLT
Parameter Access), the VLT sends 0xff in value
bit [0] and an error code in value [3]. Error
code definitions are presented in the table
below.
Parameter
Access
Command
and
Response
Examples
Parameter 971 must be set to
STORE ACTIVE SETUP for
entering data values through
LonWorks
parameter access
command in order to save
changes in drive. See parameter
971 in
Parameter Descriptions
section of this manual.
NOTE
Consult conversion index in the
VLT Instruction Manual parameter
table for correct conversion
factor for reading and writing to
and from drive.
CAUTION
!
The controller node writes 30 seconds to
parameter 206 (205),
Ramp time up of the
VLT. Conversion index is 0, so the conversion
factor is 1.0 (VLT 5000 conversion factor -2)).
The controller node access command sends
the following parameter write request to the
VLT.
nvoParamCmd.learn=
LN_LEARN_CURRENT
nvoParamCmd.selector = 206
nvoParamCmd.value[0] = 0
nvoParamCmd.value[1] = 0
nvoParamCmd.value[2] = 0
nvoParamCmd.value[3] = 1E hex (30
decimal)
The controller node receives the following
parameter access response from the VLT.
nviParamResp.learn =
LN_LEARN_CURRENT
nviParamResp.selector = 206
nviParamResp.value[0] = 0
nviParamResp.value[1] = 0
nviParamResp.value[2] = 0
nviParamResp.value[3] = 1E hex
nviParamResp.day = 0
nviParamResp.hour = 0
nviParamResp.minute = 0
nviParamResp.second = 0
nviParamResp.millisecond = 0
VLT 5000 parameters are shown in parenthesis, where applicable.