VLT
®
5000 INTERBUS
MG.10.O1.02 VLT is a registered Danfoss trademark
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Warning and alarm messages
There is a clear distinction between alarms and
warnings. In the case of an alarm, the VLT will enter
a fault condition and act as defined in the Control
Word. After the cause for the alarm has been
cleared, the master will have to acknowledge the
alarm message for the VLT to start operating again.
A warning, on the other hand may come when a
warning condition appears, and disappear when
conditions return to normal without interfering with
the process.
Warnings
Any warning within the VLT is represented by a
single bit within a warning word. A warning word is
always an action parameter. Bit status FALSE [0]
means no warning, while bit status TRUE [1] means
warning. To each bit and each bit status there is a
corresponding text string.
Any bit change in the warning word will result in a
Spontaneous / Event Notification being issued.
In addition to the warning word message the master
will also be notified through a change of bit 7 in the
Status Word.
Alarms
Following an Alarm message the VLT will enter Fault
condition. Only after the fault has been alleviated
and the master has acknowledged the alarm
message by setting bit 7 in the Control word, can the
VLT resume operation.
Any warning within the VLT is represented by a
single bit within a warning word. A warning word is
always an action parameter. Bit status FALSE [0]
means no fault, while bit status TRUE [1] means
fault. To each bit and each bit status there is a
corresponding text string.
Any bit change in the alarm word will result in a
Spontaneous / Event Notification being issued.
Since several alarms may be issued as a result of a
fault condition (e.g. Overcurrent inverter trip -
Current limit trip - Motor trip) it is important for
subsequent troubleshooting to store the alarm
messages in the sequence they occur. Parameter
615, 616 and 617 provide this service.
W
ar
ning
and
alarm
messages
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Additional display messages
When VLT
®
5000 is equipped with a INTERBUS
interface it can display the following messages in
addition to the display messages described in the
VLT 5000 product manual:
Warnings
WARN. 34
INTERBUS COMM. FAULT
-
There is no connection to the master. The
reason could be that the master is stopped (or
in a fault condition) or the INTERBUS
connection to the VLT is interrupted.
Alarms
ALARM
INTERBUS OPT. FAULT
-
The option card is disturbed by electrical noise
or there is a fault on the option card and it
must be replaced.