Troubleshooting; 12.1 Type Of Fault - Neptune NSP-M Operating Instructions Manual

Neptune solenoid pump NSP-M

12 Troubleshooting

See below for information about how to rectify faults on the device or the
system. If you cannot eliminate the fault, please consult with the
manufacturer on further measures or return the dosing pump for repair.

12.1 Type of fault

12.1.1 Dosing pump not delivering or output too low
Possible cause
Wrong type of dosing pump
selected
Valve leaking or blocked
Valve installed incorrectly
Valve damaged (e.g. valve
balls)
Suction line is leaking
Suction line is blocked (e.g.
screen in foot valve)
Shut-off valves closed
Suction head too high
Viscosity too high
Current supply interrupted
The dosing pump's electrical
data does not match that of
the mains supply
System backpressure too
high (measured at discharge
connection of dosing pump)
Table 18: Type of fault: Dosing pump not delivering or output too low
Subject to technical changes.
Remedy
è
Check the dosing pump's
technical data and if necessary
select a type with a higher
delivery capacity.
è Clean the valve and vent the
dosing pump.
è
Tighten the screw connections.
è
Reassemble the valve. Ensure
that the valve balls are located
above the valve seats.
è
Remove the damaged parts or
install a new valve.
è Seal the leak locations or replace
the parts.
è
Clean the suction line.
è
Open the shut-off valves. Inspect
the dosing pump for possible
damage.
è
Set the dosing pump to feed or
reduce the suction head.
è
Install a priming aid.
è
Possibly reduce the concentration
of the dosing medium or increase
the temperature.
è
Install spring-loaded valves.
è Increase the pipe diameter.
è
Reconnect the current supply
è Check the electrical installation.
è
Clean blocked injection nozzle.
è
Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.
è
Check function of safety valves.
12.1.2 Dosing pump does not prime
Possible cause
Valve leaking or blocked
Valve installed incorrectly
Valve damaged (e.g. valve
balls)
Suction line is leaking
Suction line is blocked (e.g.
screen in foot valve)
Shut-off valves closed
Suction head too high
Viscosity too high
Current supply interrupted
Dry the valves
Air in the suction line with
simultaneous pressure on the
pressure valve
Table 19: Type of fault: Dosing pump does not prime
12.1.3 Delivery rate varies
Possible cause
Valve leaking or blocked
Valve damaged (e.g. valve
balls)
Suction line is leaking
Table 20: Type of fault: Delivery rate varies
Operating instructions
Remedy
è
Clean the valve and vent the
dosing pump.
è
Tighten the screw connections.
è Reassemble the valve. Ensure
that the valve balls are located
above the valve seats.
è
Remove the damaged parts or
install a new valve.
è
Seal the leak locations or replace
the parts.
è
Clean the suction line.
è
Open the shut-off valves. Inspect
the dosing pump for possible
damage.
è
Set the dosing pump to feed or
reduce the suction head.
è
Install a priming aid.
è
Possibly reduce the concentration
of the dosing medium or increase
the temperature.
è
Install spring-loaded valves.
è
Increase the pipe diameter.
è
Reconnect the current supply
è
Dampen the dosing head and the
valves
è
Vent the dosing head.
è Vent the dosing head or the lines.
Remedy
è
Clean the valve and vent the
dosing pump.
è
Tighten the screw connections.
è
Remove the damaged parts or
install a new valve.
è
Seal the leak locations or replace
the parts.
Troubleshooting
27