S1A10386 10/2009 19
Diagnostics

Communication fault management

The behaviour of the drive in case of communication interruption is described in the ATV312 programming manual.
The communication between the master (external management system) and the drive is broken:
In this case, the drive will generate a (CnF) error message.
The communication card is not working properly:
In this case, the drive will generate a (COF) message.
(CnF) [Network fault]: Option card fault code
This parameter is read-only and is only visible if an option card is present.
The fault code remains saved in the parameter, even if the cause disappears.
The parameter is reset after the drive is disconnected and then reconnected.
The values of this parameter is:
1: Time out on the reception of the periodic variables addressed to the drive
For the full list of the fault detected codes, see ATV312 programming manual on www.schneider-electric.com
Code Name Probable cause Remedy
CFF [INCORRECT
CONFIG.]
• The current configuration is
inconsistent.
• Addition or removal of an option
• Return to factory settings or retrieve the backup
configuration, if it is valid. See the [Restore config.]
(FCS) parameter in ATV312 programming manual.
CnF [NETWORK
FAULT]
• Communication detected fault on the
communication card
• Check the environment (electromagnetic
compatibility).
• Check the wiring.
• Check the time out.
• Replace the option card.
• See the [CANopen fault mgt] (COL) parameter in the
ATV312 programming manual to define the stop
mode with a (CnF).
COF [CANopen FAULT] • Interruption in communication
between the option card and the
drive
• Check the communication bus.
• Check the option card.
ILF [INTERNAL LINK
FAULT]
• Interruption in communication
between the option card and the
drive
• Replace the option card.