NOTE
Please note that the availability of the individual alarms and warnings are dependent on the frequency converter type.
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 frequency converter resume
operation. All alarms within the frequency converter 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. In CIP, Alarms are
divided in to two categories:
- Major Recoverable Faults
- Major Unrecoverable Faults
Please refer to the following sections for a classification of the specific faults.
Troubleshooting MCA 121 EtherNet/IP
MG.90.J3.02 - VLT
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