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7
7.3.4.1
Fault types
In the NX frequency converter, there are four different types of faults. These types differ from each other
on the basis of the subsequent behaviour of the drive. See Table 7-3.
Figure 7-7. Fault display
Fault type symbol
Meaning
A
(Alarm)
This type of fault is a sign of an unusual operating condi-
tion. It does not cause the drive to stop, nor does it re-
quire any special actions. The 'A fault' remains in the dis-
play for about 30 seconds.
F
(Fault)
An 'F fault' is a kind of fault that makes the drive stop.
Actions need to be taken in order to restart the drive.
AR
(Fault Autoreset)
If an 'AR fault' occurs the drive will also stop immedi-
ately. The fault is reset automatically and the drive tries
to restart the motor. Finally, if the restart is not success-
ful, a fault trip (FT, see below) occurs.
FT
(Fault Trip)
If the drive is unable to restart the motor after an AR
fault an FT fault occurs. The effect of the 'FT fault' is ba-
sically the same as that of the F fault: the drive is
stopped.
Table 7-3. Fault types
F T1
Î
T13
STOP
FAULT
I /Oterm
STOP
I /Oterm
FAULT
34:21:05
I/Ote rm
17
11 Output phase
Operations days
Operation hours
Fault type symbol