Danfoss VLT FC 100 Manual

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Danfoss VLT FC 100 Manual Manual pdf 61 page image

9. Troubleshooting9.1. Alarm Word and Warning Word9.1.1. Alarm and warning messagesGeneralThere is a clear distinction between alarms and warnings. In the event of an alarm, the frequencyconverter will enter a fault condition. After the cause for the alarm has been cleared, the mastermust 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 whenconditions 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 onewarning or alarm, a sum of all warnings or alarms will be shown. Warning word and alarm wordare displayed in par. 16-90 to 16-95. For more information on the individual alarms and warnings,please refer to:VLT® HVAC Drive Design Guide.WarningsAll 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 bitstatus TRUE [1] means warning. Each bit status has a corresponding text string message. Inaddition to the warning word message the master will also be notified via a change to bit 7 in thestatus word.AlarmsFollowing an alarm message the frequency converter will enter a fault condition. Only after thefault has been rectified and the master has acknowledged the alarm message by setting bit 3 inthe Control Word, can the VLT resume operation. All alarms within the VLT are represented by asingle 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.VLT® FC 100 LonWorks 9. TroubleshootingMG.11.E1.02 - VLT® is a registered Danfoss trademark 619