Danfoss VLT MCA 121 EtherNet/IP Manual page 46

7 Troubleshooting
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)
00000001
7
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
MAR = Major Recoverable Fault
MAU = Major Unrecoverable Fault
46
Alarm word (Par. 16-90)
Brake check
Power card over temperature
Earth fault
Ctrl. card over temperature
Control word timeout
Torque limit
Over current
Motor thermistor over temp.
Motor ETR over temperature
Inverter overloaded
DC link under voltage
DC link over voltage
Short circuit
Inrush fault
Mains phase loss
AMA not OK
Live zero error
Internal fault
Brake overload
Motor phase U is missing
Motor phase V is missing
Motor phase W is missing
Fieldbus fault
24V supply fault
Mains failure
1.8V supply fault
Brake resistor short circuit
Brake chopper fault
Option change
Drive initialized
Safe Stop
Mech. Brake low
MG.90.J2.02 - VLT
CIP Classification
-
MAR
MAU
-
MAR
MAU
MAR
MAR
MAR
MAR
MAR
MAR
MAU
MAR
MAU
MAR
MAR
MAU
MAU
MAU
MAU
MAU
MAR
MAU
MAR
MAU
MAR
MAR
-
-
MAR
-
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MCA 121 EtherNet/IP