Siemens F20 fault code meaning
Siemens / F20
Series: 6RA28
Electronics board power supply fault (5U1, 5V1, 5W1
DC drive
Meaning: A fault signal from the electronic board power supply persists for more than 1.28 seconds, or the monitoring device responds periodically.
Possible causes
Source: 6RA28 Chinese Manual P79
Series: V20
DC ripple too high
converter
Meaning: The calculated DC fluctuation threshold has exceeded the safety threshold. This is usually caused by the loss of one input power supply phase.
Possible causes
Source: SINAMICS V20 Converter P410