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e
Trouble-shooting
Fault
Reason
Does not switch
No power
Faulty signal line
Faulty eletronic insert
• AC (FEL51) connected directly to L1
and N
Density of liquid too low
Fork encrusted
Fork corroded
(Inication on Output: red/yellow
flashes, N2 (FEL58): green flashes 0.3
Hz)
AC (FEL51):
AC (FEL51):
WA (FEL54):
Switches
Min-/Max-fail-save mode set wrongly
incorrectly
Sporadic faulty
Thick heavy foam, very turbulent
switching
conditions, foaming liquid
Extreme RFI
Extreme vibration
Water in housing
E5 (FEL52):
Remedy
Check power
Check signal line
Exchange
• always connect AC (FEL51) via
external load
Set density to > 0.5 at electronic insert
Clean fork
Exchange fork and process connection
Internal resistance of
Connect suitable relay
connected relay too
large
Holding current of
Connected resistor in parallel with
connected relay too low
relay
Contacts welded
Exchange WA (FEL54); put fuse in
together (after short-
contact circuit
circuit)
Set correct mode at electronic insert
Mount Vibracon in bypass
Use screened cable
Decouple, damp, turn fork 90°
Screw cover and cable gland tight
Output overloaded
Reduce load, (cable) capacitance
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