Filtech DP 200, Use And Maintenance Manual

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English
11 - FAULT MANAGEMENT
FAULT TABLE
Anomaly Intervention
Input pressure alarm
The alarm is triggered by an input pressure under 0.5 bar when
the machine is not in water delivery mode. Check the water supply
circuit and for possible shut-off taps closed.
Input flow rate alarm
(Ro-Check only)
The alarm is triggered by an input pressure under 0.5 bar when the
machine is in water delivery mode. Check the water supply circuit for
an inadequate size in particular of the tubing or flow restrictions in
general. To check the circuit, install a pressure gauge on the supply
tube immediately before the machine. Pressure in the delivery phase
must be at least 0.5 bar.
Pump not working alarm
(Ro-Check only) The alarm is triggered by a null pump pressure in the delivery phase.
Check the pump and motor, replace the faulty part if necessary.
Low pressure pump alarm
(Ro-Check only)
The alarm is triggered by a detected pump output pressure that is too
low. Check if the pump bypass is correctly adjusted (if an intervention
is necessary, follow the instructions in the manual carefully) and if
the pump is working properly.
Pump pressure too high
(Ro-Check only)
The alarm is triggered by a detected pressure over 10 bar after the
pump.
• Check if the drain is obstructed.
• Check if the membranes are exhausted (low permeate flow rate).
• Check if the pump bypass is correctly adjusted (if an intervention
is necessary, follow the instructions in the manual carefully).
Permeate quality alarm
(Ro-Check only)
The alarm is triggered by a conductivity of the permeate water that
is over the set parameter. Check if the set value is compatible with
the characteristics of the machine and the input water. Check if the
mixer is adjusted correctly. If rejection is under 90% with the mixer
fully closed, the membranes may be exhausted. If necessary, replace
the membranes in compliance with the system manual
Permeate flow rate alarm
(Ro-Check only)
The alarm is triggered by a flow rate of the permeate water that is
under the set parameter. The permeate flow rate greatly depends
on various factors
• Temperature (see manual)
• Input water conductivity. When the fixed residue increases, the
osmotic pressure increases, the permeate flow rate decreases.
• Vessel input pressure
• Permeate circuit pressure. The machine can work safely obtaining
pressure in the output circuit, if the system is appropriately
designed, but the flow rate will be reduced as a result.
• Membrane life: working hours, period of inactivity, rapid work
cycles can reduce the permeate flow rate
For a correct measurement of the machine performance, the
permeate duct pressure must be under 0.1 bar, the pump pressure
must be 8.5 bar and the measurement must be converted for 25°C
using the specific tables.