Name: Danfoss VLT MCA 121 EtherNet/IP
Brand: Danfoss
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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. 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.

Bit (Hex)

Alarm word (Par. 16-90) CIP Classification

00000001 Brake check -

00000002 Power card over temperature MAR

00000004 Earth fault MAU

00000008 Ctrl. card over temperature -

00000010 Control word timeout MAR