VLT
®
5000/5000 Flux/6000 HVAC/8000 AQUA PROFIBUS
MG.90.D1.02 – VLT is a registered Danfoss trademark
37
■ Warnings and alarm messages
There is a clear distinction between alarm mes-
sages and warnings. In the event of a fault (alarm),
the VLT issues an error condition and responds in
the manner predetermined in the control word. As
soon as the cause of the fault has been repaired,
the master must confirm the fault message for the
VLT in order to start again. A warning is issued as
soon as a warning condition occurs. This ceases as
soon as the normal operating conditions have been
re-established without the operation being dis-
rupted.
Warnings
Every warning within the VLT is represented by a
single bit in a warning word. A warning word is al-
ways an active parameter. The bit status FALSE [0]
means no warning, the bit status TRUE [1] means
warning.
Every change of a bit in the warning word gener-
ates a spontaneous message.
Apart from the notification by the warning word,
the master is also being informed by a change in
bit 7 of the status word.
Fault messages
After a fault message (alarm), the VLT issues an
error condition (bit 3 in the status word). The VLT
can resume operations only after the fault has
been repaired and the master has confirmed the
fault message by a change of bit 7 in the control
word (positive slope from ”0” to ”1”).
Every fault within the VLT is represented by a
single bit in an alarm word. The alarm word is al-
ways an active parameter. The bit status FALSE [0]
means no alarm, the bit status TRUE [1] means
alarm.
Every change of a bit in the alarm word generates
a spontaneous message.
■ Spontaneous messages
If a fault or warning condition occurs, the VLT
issues a spontaneous message provided that the
spontaneous message in parameter 917 has been
activated. Instead of responding to the request
from the master, the VLT replaces the requested
response by the fault or warning message.
Explanations regarding the individual bits of
the warning words and of the alarm word
can be found in the operations manual of the
VLT 5000/VLT 5000 Flux/6000 HVAC/8000 AQUA.
Warning and alarm messages
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