y:\pasteuriser\pasteuriser
manuals
\manuals 2019\s90refcool
manuals\s90installation-maintenance pasteuriser manual 3.12.2019.doc
Date Printed: 03/12/2019
Page No.
32
FAULT FINDING
THIS COLUMN IS FOR ENGINEERING USE ONLY
Heater Trip
PLC Input I1
The Heater Circuit Breaker F2 has tripped.
Check the circuit to establish whether the heater has failed, if there is a loose
connection and check the circuit breaker or side mounted auxiliary is faulty.
Compressor Trip
PLC Input I0
The Compressor Circuit Breaker F1 has tripped.
Check the circuit to establish whether the compressor has failed, if there is a
loose connection and if the circuit breaker or side mounted auxiliary is faulty.
Check hot & cold supply pipes are fitted the correct way around. Check
incoming cold wat
er is below 25˚C
Circulation Pump Trip
PLC Input I3
The Circulation Pump Circuit Breaker F3 has tripped.
Check the circuit to establish whether the Circulation Pump has failed, if there
is a loose connection and if the circuit breaker or side mounted auxiliary is
faulty.
Drain Pump Trip
PLC Input I11
The Drain Pump Circuit Breaker F4 has tripped.
Check the circuit to establish whether the Circulation Pump has failed, if there
is a loose connection and if the circuit breaker or side mounted auxiliary is
faulty.
Gas Pressure Stop
(Low)
PLC Input I4
The Refrigeration Low Pressure switch has tripped.
The water flow rate around the bath maybe reduced. Check the flow in tank
during refrigeration cycle. If there is no flow or a reduced flow check there is no
blockage in the water system. If there is no blockage check circulation pump
and replace if required.
Check the operation of the liquid line solenoid this should open when the
compressor starts.
The refrigeration circuit may have lost refrigerant or the Refrigeration
Expansion Valve maybe faulty. In either of these cases an Fgas qualified
refrigeration engineer will be required to diagnose this fault using the
instructions in the Water Refrigeration System Section of the maintenance
manual. (Gas charge should be 1.7kg)
Gas Pressure Stop
(High)
PLC Input I4
The Refrigeration High Pressure switch has tripped.
The refrigeration circuit is not being cooled sufficiently. Check that the Air inlet
and outlet on the Pasteuriser are not blocked and the ambient temperature
does not exceed the specification. Check also that the condenser fan runs
when the refrigeration cycle is running. Ensure incoming cold water is below
25˚c during cooling cycle. If the problem persists an Fgas qualified refrigeration
engineer maybe required to diagnose the fault using the instructions in the
Water Refrigeration System Section of the maintenance manual.
Lid Opened Fault
(PLC Input I2)
The Magnetic lid switch is not made during pasteurisation cycle.
If the lid is opened during the pasteurisation sequence. the cycle is stopped.
Advise operators not to open the lid during pasteurisation. If the lid is shut
when unit faults check the magnet is in position and magnet wiring is good.
Overflow Fault
The bath has filled to the overflow level.
Check that the water inlet valves are not leaking. Check water levels. Check
water displacement of bottles has not pushed the water level over the overflow
level. Check the gap between the high level overflow level is not less than
20mm.
Level Sensor Fault
(PLC Input I5)
Check sensor wiring
. PLC should read around “33” on “current level” when
bath is empty. (replace Sensor if no fault found)
Water Level High in Chill
Water level has risen in the cooling cycle.
Check the neck level has not moved. If it has moved, the inlet solenoid valve
has failed. If the cold water supply pressure is very high it could be overfilling
before the solenoid valve is able to shut off in time. Partially close the cold
water inlet tap supplying the unit. Try to run a cycle, might need adjustment.
No Fill Fault
The bath has failed to reach the correct level in time.
Check that the water supply is turned on. Check levels are set correctly. Check
inlet filters on the solenoid valves are clean and not blocked.