Troubleshooting; Alarm-, Warning And Extended Status Word - Danfoss FC 100 Operating Instructions Manual

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VLT® FC 100 LonWorks

9 Troubleshooting

9.1 Alarm-, Warning and Extended Status Word

9.1.1 Alarm and warning messages

General

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.

Alarm Word and Warning Word are shown on 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

VLT HVAC Drive Design Guide

to:

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 to bit 7 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 setting bit 3 in the Control Word, can the FC resume operation. All alarms within the FC 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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