04/10 MN04020001Z-EN
Introduction
65
51 External fault Error message at a digital input (DI1 - DI6), 
programmed as input for an external error 
message.
• Check the programming (P3.5, P3.6) and check the 
device indicated by the error message.
• Check the cabling for the respective device as well.
53 Field bus error The communication link between the master 
device and the drive's field bus has been inter-
rupted.
Check the installation.
Further notes are provided in the manual of the optional 
fieldbus interface (CANopen, PROFIBUS DP etc.)
If the installation is OK, please contact your closest 
Moeller representative.
54
Fieldbus interface 
error
• MMX-NET-XA mounting frame for fieldbus 
interface cards is not connected to the 
frequency inverter.
• Optional fieldbus interface is not fitted.
Error message with activated fieldbus connection of the 
interface between the frequency inverter and the 
mounting frame (MMX-NET-XA).
Error message as per P8.15.
Further notes are provided in the manual of the optional 
fieldbus interface (CANopen, PROFIBUS DP etc.)
55
Thermistor • Overtemperature in the motor.
• Connection to the thermistor, temperature 
switch or thermo click is interrupted.
Error message as per P8.11.
Display
Designation Possible cause Instructions