User`s manual

82(110) CONTROL KEYPAD
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
condition. It does not cause the drive to stop, nor does it
require any special actions. The 'A fault' remains in the
display 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 immediately.
The fault is reset automatically and the drive tries to
restart the motor. Finally, if the restart is not successful, 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 basically
the same as that of the F fault: the drive is stopped.
Table 7-3. Fault types
Fault type
symbol
F T1
Î
T13
STOP FAULT
I/Oterm
STOP
I/Oterm
FAULT
34:21:05
I/Oterm
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