VLT
®
AutomationDrive EtherNet/IP
MG.90.Jx.02 ver. 5
th
September 2007 – VLT is a registered Danfoss trademark 45
Troubleshooting
Alarm Word and Warning Word
Alarm word and warning word are shown in the display in Hex format. If there is more than one
warning or alarm, a sum of all warnings or alarms will be shown. Warning word and alarm word are
displayed in par. 16-90 to 16-95.
For more information on the individual alarms and warnings, please refer to: FC300 Design Guide
N.B.
Please note that the availability of the individual alarms and warnings are dependent on the drive
type: FC100/200/300 series.
Warning and Alarm Messages
There is a clear distinction between alarms and warnings. In the event of an alarm, the frequency
converter will enter a fault condition. After the cause for the alarm has been cleared, the master must
acknowledge the alarm message in order to start operation of the frequency converter again. A
warning, on the other hand, may appear when a warning condition arises, then disappear when
conditions return to normal without interfering with the process.
Warnings
All warnings within the frequency converter are 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. Each bit status has a corresponding text string message. In addition to the
warning word message the master will also be notified via a change in the status word.
Alarms
Following an alarm message the frequency converter will enter a fault condition. Only after the fault
has been rectified and the master has acknowledged the alarm message by a bit in the Control Word,
can the VLT resume operation. All alarms within the VLT are represented by a single bit within an
alarm word. An alarm word is always an action parameter. Bit status FALSE [0] means no alarm, while
bit status TRUE [1] means alarm.
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