Danfoss MCA 124 Operating Instructions Manual page 51

Troubleshooting MCA 124 EtherCAT Operating Instruction
10.1.6 Warning and Alarm Messages
There is a clear distinction between alarms and warnings.
When there is an alarm, the frequency converter enters a
fault condition. After the cause for the alarm has been
cleared, the master will have to acknowledge the alarm
message before the frequency converter can start
operating again. A warning, on the other hand, may come
when a warning condition appears, then disappear when
conditions return to normal, without interfering with the
process.
Warnings
A single bit within a warning word represents warnings
within the frequency converter. Bit status [0] FALSE means
no warning, while bit status [1] TRUE means warning. Any
bit change in the warning word is notified by a change of
bit 7 in the status word.
Alarms
Following an alarm message, the frequency converter
enters fault condition. When the fault has been removed
and the controller has acknowledged the alarm message
by setting bit 7 in the control word, the frequency
converter resumes operation. A single bit within an alarm
word represents alarms within the frequency converter. Bit
status [0] FALSE means no fault, while bit status [1] TRUE
10 10
means fault.
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