10
FAULT TRACING
When the control diagnostics of the AC drive find an unusual condition in the operation of the
drive, the drive shows this information:
•
This information shows on the display (see 7.7 Using the Active faults menu (M4)):
•
the location indication F1
•
the fault code (see Chapter 10.2 Fault codes)
•
a short description of the fault
•
the fault type symbol (see )
•
the FAULT or ALARM symbol
•
The red LED on the keypad starts to blink (only when a fault shows).
If many faults show at the same time, you can examine the list of active faults with the
Browser buttons.
In the NX AC drives, there are 4 different types of faults.
Table 61: Fault types
Fault type symbol
Description
A (Alarm)
The type A fault (Alarm) tells you about unusual operation on the drive. It does not
stop the drive. The 'A fault' stays in the display for about 30 seconds.
F (Fault)
The type 'F fault' stops the drive. To start the drive again, you must find a solution to
the problem.
AR (Fault Autoreset)
The type 'AR fault' stops the drive. The fault is reset automatically and the drive tries
to start the motor again. If it cannot the start the motor again, a fault trip (FT, see
below) shows.
FT (Fault Trip)
If the drive cannot start the motor after an AR fault, an FT fault shows. The type 'FT
fault' stops the AC drive.
The fault stays active until it is reset, see Chapter 10.1 Resetting a fault. The memory of active
faults can keep the maximum of 10 faults in the order in which they were shown.
Reset the fault with the Reset button on the keypad, or through the control terminal, fieldbus
or the PC tool. The faults stay in the Fault history where you can go and examine them. See
the different fault codes in Chapter 10.2 Fault codes.
Before you ask help from the distributor or the factory because of unusual operation,
prepare some data. Write down all the texts on the display, the fault code, the source
information, the Active Faults list and the Fault History.
10.1
RESETTING A FAULT
1
Remove the external Start signal before you reset
the fault to prevent that the drive starts again
without a note.
2
You have 2 options to reset a fault:
VACON · 148
FAULT TRACING
10
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