Warning And Alarm Messages - Danfoss VLT 5000 Operating Instructions Manual

Warning and Alarm Messages

There is a clear distinction between alarms and
warnings. In the case of an alarm, The VLT will enter
a fault condition. After the cause for the alarm has
been cleared, the master will have to acknowledge the
alarm message for the VLT to start operating again. A
warning on the other hand may come when a warning
condition appears, and disappear when conditions
return to normal without interfering with the process.
Warnings
Any warning within the VLT is 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. To each bit and each bit status there is a
corresponding text string. In addition to the warning
word message the master will also be notified through
a change of bit 7 in the Status Word.
Alarms
Following an Alarm message the VLT will enter Fault
condition. Only after the fault has been alleviated and
the master has acknowledged the alarm message
by setting bit 3 in the Control Word, can the VLT
resume operation. Any warning within the VLT is
represented by a single bit within a warning word.
A warning word is always an action parameter. Bit
status FALSE [0] means no fault, while bit status
TRUE [1] means fault. To each bit and each bit
status there is a corresponding text string.
= factory setting. () = display text [] = value for use in communication via serial communication port
26
®
VLT 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA DeviceNet
MG.50.H4.02 - VLT is a registered Danfoss trademark