Trane TR200 Operating Instructions Manual page 33

Troubleshooting
Alarm, Warning and Extended Status Word
Alarm and Warning Messages
General
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 BMS 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.
Alarm Word and Warning Word are shown on the display in Hex format. If there is more than one warning or alarm, a sum of all warnings
or alarms will be shown. Warning Word and Alarm Word are displayed in par. 16-90 to 16-95. For more information on the individual
alarms and warnings, please refer to: TR200 Design Guide.
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 BMS will also be notified via a change to bit 7 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 BMS has
acknowledged the alarm message by setting bit 3 in the Control Word, can the FC resume operation. All alarms within the TR200 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.
32 TR200 Embedded BACnet Operating Instructions