Troubleshooting - Neptune NXP-M Operating Instructions Manual

Stepper motor-driven diaphragm dosing pump NXP-M and NXP-P

13 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.
13.1 Type of fault
13.1.1 Alarm LED illuminates (NXP-M)
Possible cause
System backpressure too
high (measured at discharge
connection of dosing pump).
Driving belt torn.
Table 29: Type of fault: Alarm LED illuminates (NXP-M)
13.1.2 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.
Table 30: Type of fault: Dosing pump not delivering or output too low
Troubleshooting
36
Type of fault
Remedy
è
Clean blocked injection nozzle.
è
Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.
è
Check function of safety valves.
è
Contact the manufacturer.
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.
Possible cause
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 30: Type of fault: Dosing pump not delivering or output too low
13.1.3 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.
Table 31: Type of fault: Dosing pump does not prime
Operating instructions
Remedy
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.
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.