Siemens Sinamics CU240D-2 DP Operating Instructions Manual page 285

Number Cause
A30920 Temperature sensor fault
F31118 Speed difference outside tolerance For an HTL/TTL encoder, the speed difference has exceeded the value in
A31418 Speed difference per sampling rate
exceeded
F31905 Parameterization error
For further information, please refer to the List Manual.
Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
Remedy
Check that the sensor is connected correctly.
p0492 over several sampling cycles.
Check tachometer feeder cable for interruptions.
•
Check grounding of the tachometer shielding.
•
Increase the maximum speed difference per sampling cycle (p0492).
•
Check whether the connected encoder type matches the encoder that
has been parameterized.
Overview of the manuals (Page 343)
Alarms, faults and system messages
8.6 List of alarms and faults
283