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Fault
Reason
Does not
No power
switch
(green LED does not light up)
Electronic defect
Contacts welded together
(after short-circuit)
Measuring transmitter defective
Wrong signal input
Switches
Inverted measuring transmitter
incorrectly
function
Incorrect setting of change-over
switch for limit signal in FTL325N
Permanent
Switch connected as measuring
alarm signal
transmitter without current
limiting resistors
Interrupt or short-circuit line to
measuring transmitter
Measuring transmitter electronics
defective
No sensor connected
FTL325N defective
Endress+Hauser
Remedy
Check power
Replace FTL325N
Replace FTL325N;
connect a fuse into contactor circuit
Replace measuring transmitter
Connect correct input
Invert output signal on measuring
transmitter, e. g. set minimum/
maximum safety circuit differently
Correctly set change-over switch
behind front panel, p. 118, 19,
27...49
Connect resistors or switch off
alarm signal, p. 8, 18, 19, 27...49
Check line
Replace measuring transmitter
electronics
Switch off alarm signal for not used
channel, p. 18
Replace FTL325N
en -Trouble-shooting
53
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