Lutz-Jesco MEMDOS SMART LK, Руководство по эксплуатации

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Troubleshooting
Type of fault
50
© Lutz-Jesco GmbH 2014
BA-10103-02-V01
Stepper Motor-driven Diaphragm Dosing Pump MEMDOS SMART LK Operating instructions
Possible cause Remedy
Dry the valves

Dampen the dosing head and the
valves

Vent the dosing head.
Air in the suction line with
simultaneous pressure on the
discharge valve

Vent the dosing head or the lines.
Tab. 43: Type of fault: Dosing pump does not prime
13.1.3 Delivery rate varies
Possible cause Remedy
Valve leaking or blocked

Clean the valve and vent the
dosing pump.

Tighten the screw connections.
Valve damaged (e.g. valve
balls)

Remove the damaged parts or
install a new valve.
Suction line is leaking

Seal the leak locations or replace
the parts.
Suction line is blocked (e.g.
screen in foot valve)

Clean the suction line
Viscosity too high

Set Slow Motion 1

Possibly reduce the concentration
of the dosing medium or increase
the temperature.

Install spring-loaded valves.

Increase the pipe diameter.
The dosing pump's electrical
data does not match that of
the mains supply

Check the electrical installation.
Suction side pressure too high
(pump siphoning)

Install a back-pressure valve in
the pressure line.
Pressure peaks due to
acceleration with long suction
lines

Install a suction pressure
regulator.
Imprecise dosing due to
changeable positive and
negative suction heads.

Install a suction pressure
regulator.
System back pressure too
high (measured at discharge
connection of dosing pump)

Clean blocked injection nozzle.

Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.

Check function of safety valves.
Tab. 44: Type of fault: Delivery rate varies
13.1.4 No stroke movement observed
Possible cause Remedy
Diaphragm return spring
broken.

Contact the manufacturer.
Current supply interrupted

Reconnect the current supply
The dosing pump's electrical
data does not match that of
the mains supply

Check the electrical installation.
Pressure peaks due to
acceleration with long suction
lines

Install a suction pressure
regulator.
System back pressure too
high (measured at discharge
connection of dosing pump)

Clean blocked injection nozzle.

Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.

Check function of safety valves.
Tab. 45: Type of fault: No stroke movement observed
13.1.5 Dosing pump delivery rate too high
Possible cause Remedy
Suction side pressure too high
(pump siphoning)

Install a back-pressure valve in
the pressure line.
Pressure peaks due to
acceleration with long suction
lines

Install a suction pressure
regulator.
Tab. 46: Type of fault: Dosing pump delivery rate too high
13.1.6 Diaphragm is torn or tears too often
Possible cause Remedy
Shut-off valves closed

Open the shut-off valves Inspect
the dosing pump for possible
damage.
Pressure peaks due to
acceleration with long suction
lines

Install a suction pressure
regulator.
The materials are not suitable
for the dosing medium being
used

Check the resistance of the
materials.
Diaphragm not screwed up to
the end stop on the dia-
phragm rod

Screw a new diaphragm up to the
end stop.
Tab. 47: Type of fault: Diaphragm is torn or tears too often