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Chapter 7. Troubleshooting
7-1. Troubleshooting instructions
Always start troubleshooting with the checklists below if faults occur after start up or during
operation. This takes you directly (via various queries) to the cause of the problem and the
appropriate remedial measures.
Handling Precautions:
The device cannot be repaired due to its design.
f
However, it is possible to send the device in for examination. Please refer to
→
Chapter 7-5 in this situation.
Check display (optional, attachable LC display)
No display visible
1. Check the supply voltage at the head transmitter → Ter and -
2. Check whether the retainers and the connection of the display module are
correctly seated on the head transmitter, → page 22
3. If available, test the display module with other suitable head transmitters
4. Display module defective → Replace module
5. Head transmitter defective → Replace transmitter
q
Onsite error messages on the display
→
q
Faulty connection to the fieldbus host system
No connection can be made between the fieldbus host system and the measuring device. Check the following
points:
Fieldbus connection
Check the data cable
Fieldbus connector (optional)
Check pin assignment / wiring, → page 13
Fieldbus voltage
Check that a min. bus voltage of 9 V DC is present at the +/- terminals.
Permitted range: 9 to 32 V DC
Network structure
Check permissible fieldbus cable length and number of spurs, → page 9
Basic current
Is there a basic current of min. 11 mA?
Terminating resistors
Has the Foundation Fieldbus H1 been terminated correctly? Each bus
segment must always be terminated with a bus terminator at both ends (start
and finish). Otherwise there may be interference in data transmission.
Current consumption
Permissible feed current
Check the current consumption of the bus segment: The current consumption
of the bus segment in question (= total of basic currents of all bus users) must
not exceed the max. permissible feed current of the bus power supply unit.
Error messages in the FF configuration system
→
q
