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Fault
Reason
Does not switch
No power
(green LED does not light up)
Electronics are defective
Contacts welded together
(after short-circuit)
Measuring transmitter defective
Switches
Inverted measuring transmitter function
incorrectly
Incorrect setting of change-over switch for
limit signal in FTL325N
Permanent
Switch connected as measuring transmitter
alarm signal
without current limiting resistors
Interrupt or short-circuit line to measuring
transmitter
Measuring transmitter electronics defective Replace measuring transmitter electronics
Endress+Hauser
Remedy
Check power
Replace FTL325N
Replace FTL325N;
connect a fuse into contactor circuit
Replace measuring transmitter
Invert output signal on measuring
transmitter (e. g. set minimum/maximum
safety circuit differently)
Correctly set change-over switch behind
front panel (p. 16...19)
Connect resistors or switch off alarm signal
(p. 17, 19)
Check line
en - Trouble-shooting
23
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