11 Fault Tracing
11.1 General Information on 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
8.5.1 Finding the Active Faults Menu
):
-
the location indication F1
-
the fault code, see the Faults and Alarms section
For option board related fault codes, see the option board manual.
-
a short description of the fault
-
-
the
FAULT
or
ALARM
symbol
•
The red LED on the control panel starts to blink (only when a fault shows).
If many faults show at the same time, examine the list of active faults with the Browser buttons.
In the VACON
®
NX AC drives, there are 4 different types of faults.
Table 17: Fault Types
Fault type symbol
Description
A (Alarm)
The type A fault (Alarm) tells about unusual operation on the drive. It does not stop the drive. The 'A fault'
stays in the display for about 30 s.
F (Fault)
The type 'F fault' stops the drive. To start the drive again, find a solution to the problem.
AR (Fault Autore-
set)
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 (see FT, Fault Trip) 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
. 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 control panel, or through the control terminal, fieldbus, or the PC tool. The faults stay in
the Fault history.
Before asking 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.
11.2 Resetting a Fault
Context:
The fault stays active until it is reset. Reset the fault using these instructions.
Fault Tracing
Operating Guide | VACON® NXI Inverters FI9-FI14
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Danfoss A/S © 2019.11
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