Troubleshooting
28
Neptune solenoid pump
NSP-M
Operating instructions
Possible cause
Remedy
Suction line is blocked (e.g.
screen in foot valve)
è
Clean the suction line.
Viscosity too high
è
Possibly reduce the concentration
of the dosing medium or increase
the temperature.
è
Install spring-loaded valves.
è
Increase the pipe diameter.
The dosing pump's electrical
data does not match that of
the mains supply
è
Check the electrical installation.
Suction side pressure too high
(pump siphoning)
è
Install a back-pressure valve in
the pressure line.
Pressure peaks due to
acceleration with long suction
lines
è
Install a suction pressure
regulator.
Imprecise dosing due to
changeable positive and
negative suction heads.
è
Install a suction pressure
regulator.
System backpressure too
high (measured at discharge
connection of dosing pump)
è
Clean blocked injection nozzle.
è
Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.
è
Check the safety valves.
Table 20: Type of fault: Delivery rate varies
12.1.4 No stroke movement observed
Possible cause
Remedy
Diaphragm return spring
broken.
è
Contact the manufacturer.
Current supply interrupted
è
Reconnect the current supply
The dosing pump's electrical
data does not match that of
the mains supply
è
Check the electrical installation.
Pressure peaks due to
acceleration with long suction
lines
è
Install a suction pressure
regulator.
System backpressure too
high (measured at discharge
connection of dosing pump)
è
Clean blocked injection nozzle.
è
Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.
è
Check function of safety valves.
Table 21: Type of fault: No stroke movement observed
12.1.5 Dosing pump delivery rate too high
Possible cause
Remedy
Suction side pressure too high
(pump siphoning)
è
Install a back-pressure valve in
the pressure line.
Pressure peaks due to
acceleration with long suction
lines
è
Install a suction pressure
regulator.
Table 22: Type of fault: Dosing pump delivery rate too high
12.1.6 Diaphragm is torn or tears too often
Possible cause
Remedy
Shut-off valves closed
è
Open the shut-off valves. Inspect
the dosing pump for possible
damage.
Pressure peaks due to
acceleration with long suction
lines
è
Install a suction pressure
regulator.
The materials are not suitable
for the dosing medium being
used
è
Check the resistance of the
materials.
Diaphragm not screwed up to
the end stop on the dia-
phragm rod
è
Screw a new diaphragm up to the
end stop.
System backpressure too
high (measured at discharge
connection of dosing pump)
è
Clean blocked injection nozzle.
è
Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.
è
Check function of safety valves.
Media sediment in dosing
head
è
Clean the dosing head.
Table 23: Type of fault: Diaphragm is torn or tears too often
12.1.7 Loud noises on the dosing pump
Possible cause
Remedy
The drive magnet's stop
damper is worn-out
è
Contact the manufacturer.
Table 24: Type of fault: Loud noises on the dosing pump
Summary of Contents for NSP-M
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