Extended Diagnosis - Danfoss VLT 5000 Operating Instructions Manual

Extended Diagnosis

By the extended diagnose function it is possible
to receive alarm and warning information from the
frequency converter. The setting of parameter 849
determines which frequency converter events should
trigger the extended diagnose function.
If parameter 849 is set to Disable [0], no extended
diagnose data is sent regardless wether they
appear in the frequency converter.
If parameter 849 is set to Alarms [1], extended
diagnose data is sent, if one or more alarms arrive
in the Alarm parameters. If parameter 849 is set to
Alarms/Warnings [2], extended diagnose data is sent
if one or more alarms/warnings arrive in the Alarm
parameters or the warning parameter.
Byte Content
0 through 5 Standard DP Diagnose data
6 Pdu length xx
7 Status type = 0x81
8 Slot = 0
9 Status info = 0
10 through 13 VLT parameter 540
14 through 17 VLT parameter 541
18 through 21 VLT parameter 538
22 through 23 VLT parameter 953
MG.90.G1.02 - VLT is a registered Danfoss trademark
VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
The sequence of an extended diagnose is as follows:
If an Alarm or warning appears, the frequency
converter will indicate that to the master by sending
a high prior message via the output data telegram.
This will cause the master to ask the frequency
converter for extended diagnose information, which
will be replied by the frequency converter.
When the Alarm/warning disappears, the frequency
converter will again indicate that to the master, and
on the following request from the master, return a
standard DP diagnose frame (6 bytes).
The extended diagnose frame has the following content:
Description
Standard DP Diagnose frame
Header of Extended diagnostic data
Header of Extended diagnostic data
Header of Extended diagnostic data
Header of Extended diagnostic data
VLT warning word
VLT Status word
VLT Alarm word
Communication warning word
47