Danfoss MCA 122 Modbus TCP Operating Instructions Manual page 42

Troubleshooting
NOTICE
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. If
there is an alarm, the frequency converter enters 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 [0]
6 6
FALSE means no warning, while bit status [1] TRUE means
warning. Each bit status has a corresponding text string
message. In addition to the warning word message, the
master also notifies via a change in the status word.
38
MCA 122 Modbus TCP
00000001
00000002
00000004
00000008
00000010
00000020
00000040
00000080
00000100
00000200
00000400
00000800
00001000
00002000
00004000
00008000
00010000
00020000
00040000
00080000
00100000
00200000
00400000
00800000
01000000
02000000
04000000
08000000
10000000
20000000
40000000
80000000
Table 6.3 Alarm Word 2
®
MG90P202 - VLT is a protected Danfoss trademark
Bit (Hex) Alarm word 2
(16-91 Alarm Word 2)
Service Trip, Read/Write
Reserved
Service Trip, Typecode/
Sparepart
Reserved
Reserved
No Flow
Dry Pump
End of Curve
Broken Belt
Discharge high
Start failed
Speed limit
Reserved
Reserved
Reserved
Reserved
Reserved
KTY error
Fans error
ECB error
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
PTC thermistor
Dangerous failure