Hauser
61
Fault
Reason
Remedy
Does not switch
No power
Check power
Faulty signal line
Check signal line
F
aulty electronic insert
- FEL51 connected directly to L1 and N
Exchange
- always connect FEL51 via external load
Density of liquid too low
Set density to > 0.5 at electronic insert
Fork encrusted
Clean fork
Fork corroded
(Indication on FEL: red/yellow flashes,
FEL58: green flashes 0.3 Hz)
Exchange fork and process connection
FEL51: Internal resistance of connected
relay too large
Connect suitable relay
FEL51: Holding current of connected relay
too low
Connected resistor in parallel with relay
FEL54: Contacts welded together
(after short-circuit)
Exchange FEL54; put fuse in contact circuit
Switches
incorrectly
Min-/Max- fail-safe mode set wrongly
Set correct mode at electronic insert
Sporadic faulty
switching
Thick heavy foam,
very turbulent conditions,
foaming liquid
Mount Liquiphant in bypass
Extreme RFI
Use screened cable
Extreme vibration
Decouple, damp, turn fork 90°
Water in housing
Screw cover and cable gland tight
FEL52: Output overloaded
Reduce load,(cable) capacitance
Switches
incorrectly after
power failure
FEL57, behaviour during switch-on test
(functional test)
Observe switching behaviour of FEL57;
After power failure blockplant control
for up to 45 s
en - Trouble-shooting
