Siemens Water Heater SINVERT 350 Manuel D’Utilisation
Alarm and fault messages
4.2 Alarm and fault messages
4.2 Alarm and fault messages
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Table 4-22 Fault 94
(Alarm) Profibus system has failed
Condition
The S7 has detected serious errors on the Profibus
Equalizing current on the Profibus cable shield
The Profibus cable shield is not properly connected
Terminating resistors are not correctly set
No power supply available at the beginning or end of the
Profibus line
External conducted interference
Equalizing current on the Profibus cable shield
The Profibus cable shield is not properly connected
Terminating resistors are not correctly set
No power supply available at the beginning or end of the
Profibus line
External conducted interference
Causes
Defect on Profibus node(s)
Provide equipotential bonding between individual
inverters
Connect the cable shields correctly
Change the Profibus cabling
Provide equipotential bonding between individual
inverters
Connect the cable shields correctly
Change the Profibus cabling
Possible
remedial
measures
remedial
measures
Replace the defective printed circuit boards
Table 4-23 Fault 95
(Alarm) Grid voltage outside tolerance
Condition
The CU has detected that the measured grid frequency
is outside the set tolerance limits
Incorrect phase sequence
is outside the set tolerance limits
Incorrect phase sequence
Causes
Fluctuations of the line frequency
Measures
Connect up the cables correctly (change the phases,
phase sequence must be clockwise)
phase sequence must be clockwise)