Endress+Hauser Nivotester FTL325P Serie Mode D'emploi page 36

en -Trouble-shooting
36
Fault
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Does not
switch
Switches
incorrectly
Permanent
alarm signal
Switches
incorrectly
afterpower
failure
Reason
No power
(green LED does not light up)
Electronic defect
Contacts welded together
(after short-circuit)
Measuring transmitter
defective
Incorrect setting of change-
over switch for limit signal in
FTL325P
Interrupt or short-circuit line
to measuring transmitter
Measuring transmitter
electronics defective
Nivotester defective
FEL57, Behaviour during
switch-ontest (functional
test)
Remedy
Check power
Replace FTL325P
Replace FTL325P;
connect a fuse into contactor
circuit
Replace measuring transmitter
Correctly set change-over
switch behind front panel,
p. 15 ff
Check line
Replace measuring transmitter
electronics
Replace FTL325P
Observe switching behaviour of
FEL57; after a power failure
block the system control for up
to about 45 s
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