Lutz-Jesco MAGDOS LP, Руководство по эксплуатации

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Troubleshooting
Type of fault
53
© Lutz-Jesco GmbH 2014
Subject to technical changes.
140327
Solenoid-Diaphragm Dosing Pump MAGDOS LP Operating Instructions
BA-10231-02-V03
13.1.3 Delivery rate varies
13.1.4 No stroke movement observed
13.1.5 Dosing pump delivery rate too high
13.1.6 Diaphragm is torn or tears too often
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

Possibly reduce the concentra-
tion 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 accel-
eration with long suction
lines

Install a suction pressure regu-
lator.
Imprecise dosing due to
changeable positive and
negative suction heads.

Install a suction pressure regu-
lator.
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.
Table 13-3: Type of fault: Delivery rate varies
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.
Table 13-4: Type of fault: No stroke movement observed
Pressure peaks due to accel-
eration with long suction
lines

Install a suction pressure regu-
lator.
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.
Possible cause Remedy
Suction side pressure too
high (pump siphoning)

Install a back-pressure valve in
the pressure line.
Pressure peaks due to accel-
eration with long suction
lines

Install a suction pressure regu-
lator.
Table 13-5: Type of fault: Dosing pump delivery rate too high
Possible cause Remedy
Shut-off valves closed

Open the shut-off valves Inspect
the dosing pump for possible
damage.
Pressure peaks due to accel-
eration with long suction
lines

Install a suction pressure regu-
lator.
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
diaphragm rod

Screw a new diaphragm up to
the end stop.
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.
Media sediment in dosing
head

Clean the dosing head.
Table 13-6: Type of fault: Diaphragm is torn or tears too often
Possible cause Remedy
Table 13-4: Type of fault: No stroke movement observed