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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 informa-
tion:
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 type symbol, see
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 18: 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 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 (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
The fault stays active until it is reset. Reset the fault using these instructions.
Procedure
Remove the external Start signal before resetting the fault to prevent that the drive starts again without a note.
There are 2 options to reset a fault:
Push the [reset] button on the control panel for 2 s.
Use a reset signal from the I/O terminal or fieldbus.
The display goes back to the same state it was before the fault.
11.3 Creating Service Info File
Use these instructions to create a service info file in VACON
®
NCDrive PC tool to help to troubleshoot in a fault situation.
Make sure the VACON
®
NCDrive PC tool is installed on the computer. To install it, go to our website
.
AQ275638903263en-000601 / DPD00910
128 | Danfoss A/S © 2022.12
Fault Tracing
VACON® NXS/NXP Air-cooled
Operating Guide
