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Troubleshooting

Type of fault

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

Operating instructions

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

Remedy

System backpressure 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.

Driving belt torn.

Contact the manufacturer.

Table 29: Type of fault: Alarm LED illuminates (NXP-M)

13.1.2 Dosing pump not delivering or output too low

Possible cause

Remedy

Wrong type of dosing pump
selected.

Check the dosing pump's
technical data and if necessary
select a type with a higher
delivery capacity.

Valve leaking or blocked.

Clean the valve and vent the
dosing pump.

Tighten the screw connections.

Valve installed incorrectly.

Reassemble the valve. Ensure
that the valve balls are located
above the valve seats.

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.

Shut-off valves closed.

Open the shut-off valves. Inspect
the dosing pump for possible
damage.

Suction head too high.

Set the dosing pump to feed or
reduce the suction head.

Install a priming aid.

Table 30: Type of fault: Dosing pump not delivering or output too low

Possible cause

Remedy

Viscosity too high.

Possibly reduce the concentration
of the dosing medium or increase
the temperature.

Install spring-loaded valves.

Increase the pipe diameter.

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.

System backpressure 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 30: Type of fault: Dosing pump not delivering or output too low

13.1.3 Dosing pump does not prime

Possible cause

Remedy

Valve leaking or blocked.

Clean the valve and vent the
dosing pump.

Tighten the screw connections.

Valve installed incorrectly.

Reassemble the valve. Ensure
that the valve balls are located
above the valve seats.

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.

Shut-off valves closed.

Open the shut-off valves. Inspect
the dosing pump for possible
damage.

Suction head too high.

Set the dosing pump to feed or
reduce the suction head.

Install a priming aid.

Table 31: Type of fault: Dosing pump does not prime

Содержание NXP-M

Страница 1: ...Neptune stepper motor driven diaphragm pump NXP M and NXP P Operating instructions Read the operating manual The user is responsible for installation and operation related mistakes...

Страница 2: ......

Страница 3: ...ions 15 6 1 NXP M P 68 through 285 15 6 2 NXP M P 375 540 and 810 16 7 Installing the Dosing Pump 17 7 1 Set up information 17 7 2 Installation examples 17 8 Hydraulic installations 18 8 1 Design of t...

Страница 4: ...Refers to a potentially hazardous situation Failure to follow this instruction may lead to death or severe injuries CAUTION Refers to a potentially hazardous situation Failure to follow this instruct...

Страница 5: ...e using are suitable for the dosing medium Make sure that the lubricants adhesives sealants etc that you use are suitable for the dosing medium WARNING Caustic burns or other burns through dosing medi...

Страница 6: ...Sheets to the dosing media find out what protective equipment you need You will require the minimum of the following personal protective equipment Personal protective equipment required Protective gog...

Страница 7: ...ves 2 5 2 Trained persons Trained persons have received training from the operator about the tasks they are to perform and about the dangers stemming from improper behaviour In the table below you can...

Страница 8: ...characteristic curves on page 40 n Comply with the information regarding the operating and environmen tal conditions see chapter 5 Technical data on page 13 n Any restrictions regarding the viscosity...

Страница 9: ...g operational disturbances n Elimination of operational disturbances by personnel without adequate qualifications n Deposits in the dosing head due to inadequate purging particularly with suspensions...

Страница 10: ...e 4 2 Scope of delivery Please compare the delivery note with the scope of delivery The following items are part of the scope of delivery n Dosing pump NXP M and NXP P n One set each of hose clamping...

Страница 11: ...his results in a pulsing flow If the dosing pump is in the suction stroke phase the diaphragm is pulled into the rear final position Due to the resulting vacuum in the dosing head the discharge valve...

Страница 12: ...stroke at different speeds For low supply rates for example the dosing pump performs the suction stroke at the maximum speed and adjusts the speed of the pressure stroke to match the desired supply r...

Страница 13: ...1 26 1 60 2 36 3 44 Average delivery pressure psig 145 116 72 44 36 22 Max stroke frequency min 1 150 Table 11 Output data with a PVC design 5 2 Operating conditions and limits Information Value NXP...

Страница 14: ...pply 110 240 V AC 10 5 50 60 Hz Power consumption W 25 Table 14 Electrical specifications 5 4 Other data Information Value NXP M and NXP P Size M68 P68 M140 P140 M285 P285 M375 P375 M540 P540 M810 P81...

Страница 15: ...ith dosing head made of PVC PP or PVDF all dimensions in inch 9 33 7 95 3 15 0 67 L L 4 72 7 08 2 32 2 76 0 25 3 94 4 57 3 15 Fig 8 Dimensioned drawing of NXP M P 68 through 285 with dosing head made...

Страница 16: ...76 0 26 3 31 3 94 4 57 9 33 7 93 Fig 9 Dimensioned drawing of NXP M P 375 540 and 810 with dosing head made of PVC PP PVDF or stainless steel 1 4571 all dimensions in mm Hose clamp connector Material...

Страница 17: ...e vibration free and stable n There must be enough free space in the area of the dosing head and the suction and discharge valves for these parts to be easily dismantled if required The entire space r...

Страница 18: ...lled dosing processes damage to the piping and to the dosing pump Ensure that the pressure on the discharge side is at least 15 psig than on the suction side NOTE Locking of threads Stainless steel an...

Страница 19: ...changed in 90 intervals The suction valve 3 must always point downwards Accordingly arrow 2 and pressure valve 1 always point upwards This is irrespective of the positioning of the dosing head to the...

Страница 20: ...iece 5 Screw the union nut onto the valve of the dosing pump Hose clip connected 8 4 2 Making the glue in connection a b Fig 15 Glue in connection Perform the following working steps 1 Cut the PVC tub...

Страница 21: ...heads made of stainless steel For the procedure when venting refer to chapter 11 1 1 Venting the dosing pump on page 30 Fig 18 Dosing head venting facility with hose connection Perform the following w...

Страница 22: ...a back pressure valve is unnecessary if you use a hose injection nozzle and if the backpressure that it generates is adequate 8 7 5 Pulsation dampener Pulsation dampeners have the following functions...

Страница 23: ...ties since the positive delivery pressure reduces Further problems that can occur n Greater wear on the dosing pump e g diaphragm rupture due to the effects of heavy forces with particularly high tank...

Страница 24: ...earth 9 1 Principles n The dosing pump has a 110 240 V AC 50 60 Hz wide range power supply unit n The electrical connection comply with local regulations n The dosing pump must be plugged into a groun...

Страница 25: ...he conductive rubber band Fig 21 Conductive rubber band in connection socket 1 Remove the conductive rubber band before inserting the cable in the connection socket After the cable has been removed th...

Страница 26: ...itoring systems of Neptune An adapter is required if using older suction lines with a 0 14 inch jack plug You can find this adapter and additional cables in the Neptune price list Pin M12x1 A coded As...

Страница 27: ...rms a pressure stroke The Alarm LED 2 is lit when a fault has occurred see chapter 13 1 1 Alarm LED illuminates NXP M on page 36 10 2 Operating elements of the control NXP P Fig 24 Operator controls o...

Страница 28: ...lteration of the password WARNING Caustic burns or other burns through dosing media If the password protection is activated operation of the dosing pump is blocked The only way to stop a dosing pump w...

Страница 29: ...e 120 seconds even if this runs out during entry 4 3 2 1 OK Fig 27 Entering the password 1 Use the and keys to set a value from 0 to 9 for the first digit of the code and then press 2 Proceed as descr...

Страница 30: ...dosing pump is functioning correctly Check first whether undesirable reactions could occur between the actual dosing medium and the water Perform the following working steps 1 Open the shut off valve...

Страница 31: ...hen close the discharge 11 2 NXP P Operating modes The NXP P dosing pump has the following operating modes n Internal Manual setting of the delivery capacity n External Controlling the stroke frequenc...

Страница 32: ...irst 4 pulses 120 100 20 and this is added to the 3 pulses 90 20 110 The third dosing stroke also only requires 3 additional pulses 90 10 100 A further 4 pulses are then required for the fourth dosing...

Страница 33: ...You must follow the safety data sheet of the dosing medium 11 6 Storage Storing the dosing pump correctly extends its service life You should avoid negative influences such as extreme temperatures hi...

Страница 34: ...ury and material damage The dosing pump can generate a pressure that is many times the rated one The dosing medium can escape in the case of material failure or wear on the dosing head the connection...

Страница 35: ...by dosing medium residues The diaphragm 3 thread was lightly greased e g Molycote Longterm W2 1 Screw the diaphragm manually in the clockwise direction until it safely contacts into the diaphragm rod...

Страница 36: ...d Open the shut off valves Inspect the dosing pump for possible damage Suction head too high Set the dosing pump to feed or reduce the suction head Install a priming aid Table 30 Type of fault Dosing...

Страница 37: ...e valve in the pressure line Pressure peaks due to acceleration with long suction lines Install a suction pressure regulator Table 32 Type of fault Delivery rate varies Possible cause Remedy Imprecise...

Страница 38: ...ressure 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 diaph...

Страница 39: ...ntaining n 1 Diaphragm item 1 n 1 set of dosing head screws item 3 n 1 set washers item 4 only NXP M P 375 540 810 Diaphragm kit Size Part No 68 NSP002 140 285 NSP003 375 540 810 NSP004 14 2 Dosing he...

Страница 40: ...es were determined on the manufacturer s test stands They apply at 68 F for water at 100 stroke frequency The delivery capacity depends on the medium density and viscosity and temperature Since these...

Страница 41: ...misuse 8 Function description 11 G General warnings 5 Glue in connection 20 H Handling instructions Marking 4 Hazards due to non compliance with the safety instructions 6 Hydraulic accessories 21 Hydr...

Страница 42: ...art up 30 Storage 33 Structure of the dosing pump 10 Suction pressure regulator 23 Suspensions 23 System piping 19 T Technical data 13 Temperatures Approved ambient temperature 13 Approved media tempe...

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