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Vacuum Pumps N 920 APE-W and N 920 APDC-B

Troubleshooting

Translation of original Operating and Installation Instructions, english, KNF 121690-121708 09/19

10. Troubleshooting

DANGER

Extreme danger from electrical shock!

➔

Disconnect the pump power supply before work-

ing on the pump.

➔

Make sure the pump is de-energized and se-

cure.

➔

Check the pump (see Tab. 19 and Tab. 20).

Pump does not transfer

Cause

Fault remedy

Pump is not connected with the
power source.

➔

Connect pump with the power source.

No voltage in the power source.

➔

Check room fuse and switch on if necessary.

The pump’s overcurrent protec-
tion circuit has responded.

➔

Remove the pump from the source of electrical power.

➔

Determine and eliminate the cause of the overcurrent (e.g.

inproper pressure, liquid in the pump heads).

The pump must be unplugged for some seconds before the
electronics will allow to restart.

Connections or lines blocked.

➔

Check connections and lines.

➔

Remove blockage.

External valve is closed or filter
is clogged.

➔

Check external valves and filters.

Condensate has collected in
pump head.

➔

Detach the condensate source from the pump.

➔

Flush pump (see Chapter 8.2.1).

Diaphragm or valve plates are
worn.

➔

Replace diaphragm and valve plates (see Chapter 9.3).

Tab. 19

Flow rate, pressure or vacuum too low

The pump does not achieve the output specified in the Technical data or the data sheet.

Cause

Fault remedy

Condensate has collected in
pump head.

➔

Detach the condensate source from the pump.

➔

Flush pump (see Chapter 9.2.1).

There is gauge pressure on
pressure side and at the same
time vacuum or a pressure
above atmospheric pressure on
suction side.

➔

Change the pressure conditions.

Pneumatic lines or connection
parts have an insufficient cross
section.

➔

Disconnect pump from system to determine output values.

➔

Eliminate throttling (e.g. valve) if necessary.

➔

Use lines or connection parts with larger cross section if

necessary.

Leaks occur on connections,
lines or pump head.

➔

Check that tubes sit correctly on hose nozzles.

➔

Replace leaky tubes.

➔

Eliminate leaks

Содержание N 920 APDC-B

Страница 1: ...920 TRANSLATION OF ORIGINAL OPERATING AND INSTALLATION INSTRUCTIONS ENGLISH DIAPHRAGM VACUUM PUMP Note Before operating the pump and the accessories please read the operating instructions and pay attention to the safety precautions ...

Страница 2: ...unction 11 6 Transportation 13 7 Installation and connection 14 8 Operation 20 9 Servicing 32 10 Troubleshooting 37 11 Spare parts and accessories 39 12 Returns 40 KNF Neuberger GmbH Alter Weg 3 79112 Freiburg Germany Phone 49 0 7664 5909 0 Fax 49 0 7664 5909 99 E mail info knf de www knf de ...

Страница 3: ...Warning WARNING A danger is located here Possible consequences of a failure to observe the warning are specified here The signal word e g Warning indicates the danger level Measures for avoiding the danger and its conse quences are specified here Danger levels Signal word Meaning Consequences if not observed DANGER warns of immedi ate danger Death or serious injuries and or serious damage are the ...

Страница 4: ...pump or the pump connection must be checked regularly with leaky connections there is a danger that hazardous gases or vapors may escape from the pump system Before using a medium check whether the medium can be trans ferred danger free in the specific application case Before using a medium check the compatibility of the materials of the components in contact with the medium see Chapter 4 Tech nic...

Страница 5: ...ng dusts liquids aerosol biological and microbiological substances fuel explosive and combustible materials fibers oxidizing agent foodstuffs The pumps are not suitable for use with aggressive media Other pumps in the KNF product line are designed for use with aggres sive media Please contact us for more information The pumps must not be used to create vacuum and overpressure simultaneously An ove...

Страница 6: ...s read and understood the Operat ing and Installation Instructions and in particular the Safety chap ter Observe the accident prevention and safety regulations when per forming any work on the pump and during operation For pump N 920 APE W Open housing parts with notice sticker see Fig 1 only after separating mains plug from power source Ensure that the pump is separated from the mains and is de e...

Страница 7: ...re to be regarded as not ready for use Partly completed machinery may not be com missioned until such time as it has been determined that the ma chine in which the partly completed machinery is to be assembled is in conformity with the provisions of the Machinery Directive 2006 42 EC The following essential requirements of Annex I of Di rective 2006 42 EC general principles are applied and observe...

Страница 8: ...aintenance free But KNF recommends checking the pump regularly with regard to conspicuous changes in noise and vibrations Only have repairs to the pumps carried out by the KNF Customer Service responsible Housing with voltage caring parts may be opened by technical per sonnel only Use only genuine parts from KNF for servicing work Customer service and repairs ...

Страница 9: ...hread size G 1 8 Tab 5 Electrical data N 920 APE W Parameter Value Automatic mains power adjust ment 100 240V 50 60 Hz Max operating current A 1 3 Power consumption pump W 120 Maximum permitted mains voltage fluctuations 10 Protection class Motor IP 20 Tab 6 The pump is supplied by a universal power supply with inte grated overload protection It is protected against overheating by a temperature se...

Страница 10: ...ing by a temperature sensor on the motor board and equipped with overcurrent protection If one of these safety functions is triggered the pump will be shut down and must be manually reset as follows Separate pump from electrical power supply Remove the cause s of the fault before restarting Weight Pump type Value N 920 APE W 10 0 kg N 920 APDC B 8 5 kg Tab 8 Other parameters Parameter Value Permis...

Страница 11: ...tructions english KNF 121690 121708 09 19 11 5 Design and function Design N 920 APE W Fig 2 Design N 920 APE W Design N 920 APDC B Fig 3 Design N 920 APDC B 1 Inlet suction side 2 Outlet pressure side 3 Potentiometer special design 4 Power switch 1 Motor control electronics 2 Inlet suction side 3 Outlet pressure side ...

Страница 12: ...g 5 Function diaphragm stabilization system An additional diaphragm the so called stabilization diaphragm 3 separates the underside of the working diaphragm from the crank space of the pump see Fig 5 The space between the two dia phragms called a vacuum chamber 2 is connected with the suc tion side of the pump via an balancing connection 1 This way the vacuum chamber has approximately the same pre...

Страница 13: ... injury due to sharp edges on the packaging There is a possibility of injury by cutting on the sharp edges while gripping on edges or when opening the packaging If necessary wear suitable personal protective equipment e g safety shoes safety gloves Transport the pump in its original packaging to the installation location Store the original packaging of the pump for example for fu ture storage Chec...

Страница 14: ...onditions described in Chapter 4 Technical Data Observe the safety precautions see Chapter 3 7 1 Installation of the pump Choose a safe location flat surface for the pump Before installation store the pump at the installation location to bring it up to ambient temperature See Fig 6 N 920 APE W and Fig 7 N 920 APDC B for mounting dimensions Fig 6 Mounting dimensions pump series N 920 APE W All dime...

Страница 15: ...d against rain splash hose and drip water as well as other pollutions Make sure that the installation location is accessible for maintenance and service The IP protection class of the pump motor is indicated on the type plate Install the pump at the highest point in the system to prevent condensate from collecting in the pump head Protect the pump from dust Protect the pump from vibrations and jol...

Страница 16: ...PDC B WARNING Hazard of injuries during operation Take protective measures against touching parts connected to electrical power electrical connec tion Take protective measures against touching mov ing parts e g fans Hazard of damage to the pump during operation Take protective measures against foreign ob jects which could enter the pump Protection against touching and foreign objects ...

Страница 17: ...ds directives regulations and technical standards must be observed In the electrical installation arrangements complying with EN 60335 1 must be made for disconnecting the pump motor from the electrical supply The motors of the pump must be protected according to EN 60204 1 protection against excess current or overload ing For max operating current of the pump see pump s type plate It is recommend...

Страница 18: ...nnect the positive and negative pole Note the proper polarity red connection cable black connection cable Incorrect lead connection will damage electronics of brushless DC motors type designation ending with B The supply wires have inverse polarity protection on the motor board for this pur pose while the control voltage wires do not have this protec tion function Control voltage may only be appli...

Страница 19: ... tubing or pipes for example This will avoid transferring to the system any pump oscillations that may arise Connecting pump A marking on the pump head shows the direction of flow CAUTION Risk of injury due to mixing up suction and pressure side Confusion between suction and pressure sides can lead to breakage of connected components on the suction and pressure sides Observe the marking of the inl...

Страница 20: ... Make sure the pumps are not used improperly see Chapter 2 2 Observe the safety precautions see Chapter 3 The pumps are intended for installation Before putting them into service it must be established that machinery or equipment in which they are installed meets the relevant regulations WARNING Hazard of the pump head bursting due to excessive pressure increase Do not exceed max permissible opera...

Страница 21: ...ainst pressure or vacuum it may block and the integrated overload protection switches the pump off Make sure that normal atmospheric pressure is present in the lines during switch on Only pump N 920 APE W Switch on pump with mains switch see Fig 2 Depending on the level of the applied electrical voltage initiali zation of the electronics can take up to one second before the pump starts The life of...

Страница 22: ...08 09 19 N 920 APE W with potentiometer special design The pump s speed can be varied via the potentiometer Fig 2 3 The flow rate can be adjusted this way 8 2 Control Only for pumps with external actuation at the control cable con nection Control cable and Level Translator see accessories on page 39 Control pin assignments see Tab 12 page 24 ...

Страница 23: ...onics N 920 APDC B Motor Nennspannung Nominal voltage V 24 Spannungsbereich Voltage range V 7 30 Elektrische Anschlüsse Electrical connection Litzenbelegung lead assignment Funktion function Litzenfarbe lead color Signalname signal name Größe size Speisespannung Supply voltage rot red U AWG 18 Speisespannung Ground 0V schwarz black U GND AWG 18 Tab 11 Connection plan motor electronics N 920 APDC B...

Страница 24: ...WG 18 5V Ausgangsspannung 5V power supply schwarz black U5V AWG 28 UL 20932 Eingangssignal Drehzahlregelung Input signal speed control weiß white UCtrl AWG 28 UL 20932 Ausgangssignal Drehzahl Output signal speed gelb yellow USpd AWG 28 UL 20932 Eingangssignal Remote EIN AUS Input signal Remote ON OFF grün green URmt AWG 28 UL 20932 Ausgangssignal Fehler Output signal fault lila purple UFlt AWG 28 ...

Страница 25: ... range 0 100 Tastgradbeschreibung min Pumpe min Förderleistung max Pumpe max Förderleistung Duty cycle description min pump min flow max pump max flow min max 2 100 Eingangsimpedanz 1kHz Input impedance 1kHz kΩ 12 Ausgangssignal Drehzahl USpd Output signal speed USpd Analog Pulse pro Umdrehung Pulses per revolution 1 Pulstastverhältnis Pulse duty cycle 50 1 PWM Signal PWM Frequenz PWM frequency Hz...

Страница 26: ...tbarkeit Max current carrying capacity mA 10 Ausgangsimpedanz 1kHz Output impedance 1kHz kΩ 9 Tab 12 part 3 Connection plan motor electronics N 920 AP 29DC B If the black wire is used as voltage source and at the same time as the default control voltage for the white wire the output voltage decreases when the voltage source is under load At the same time the default voltage for the white wire de c...

Страница 27: ...ntrol voltage 8 2 1 1 Speed input 29 versions The speed range of nmin nmax is shown scaled to the control volt age UCtrl UCtrl min 0 1 V UCtrl max 5 0 V If the control voltage is less than Uctrl min the motor is OFF Fig 12 Control voltage speed curve standard Speed is specified through the 8 pin controller connection white wire see Tab 12 Optional analog settings for control voltage input The foll...

Страница 28: ...roller generated speed synchronized pulse width modulation see Fig 14 Fig 14 Analog speed output standard Optional speed output The motor controller generates a speed synchronized right angle frequency with 5V TTL level see Fig 15 Fig 15 Digital speed output optional 8 2 2 Remote ON OFF 29 versions Remote ON OFF is through an 8 pin controller connection green wire see Tab 12 To start the motor the...

Страница 29: ...ive Connection communication plug see Fig 9 PIN 1 do not connect PIN 2 do not connect PIN 3 GND PIN 4 5V max 50 mA PIN 5 TX MBLC PIN 6 RX MBLC Motor connection options external control unit Fig 16 External activation options optional The following motor functions can be controlled Motor remote ON OFF In the factory condition the motor is OFF when operating volt age is applied However as an option ...

Страница 30: ...characters When transmitting the commands must be followed by ASCII character CR carriage return deci mal value 013 The underlined expressions are not characters but symbols as explained in table Tab 15 Parameter Command Function Reply Motor dB Start S E dE Stop S E Speed dSnnnn nnnn speed value Set nominal speed ns E Tab 13 Control commands A pause of at least 25 ms is required after the dB instr...

Страница 31: ...nal motor speed Value min 1 nl Minimum nominal motor speed Value min 1 nh Maximum nominal motor speed Value min 1 ii operating current of the motor Value mA ti temperature of the motor controller Value C ei Fault status 16 bit value Tab 15 Symbols The symbols represent the ASCII codes of sequences of digits any length The controller processes input values only as whole num bers integers Interface ...

Страница 32: ...lushing pump Before switching off the pump flush it with air if necessary for safety reasons with an inert gas for about five minutes under atmospheric conditions ambient pressure 9 2 2 Cleaning pump Only use solvents for cleaning if the head materials cannot be attacked check the resistance of the material If compressed air is available blow out the components 9 3 Replacing diaphragm and reed val...

Страница 33: ...g if necessary e g pro tective gloves Flush pump before replacing the diaphragm and valve plates see Chapter 9 2 1 Fig 17 Exploded drawing N 920 APE W 1 Head cover 2 Screw 3 Intermediate plate head 1 4 Valve plate 5 O ring Ø 24 x 2 6 O ring Ø 5 5 x 2 7 Intermediate plate head 2 8 Intermediate plate head 3 9 Diaphragm head 1 10 Diaphragm head 2 11 Diaphragm head 3 12 Connecting rod head 2 13 Connec...

Страница 34: ... hands For diaphragms 10 and 11 Make sure the diaphragm spacers being between diaphragm and connecting rod do not fall into the pump housing If diaphragm spacers should adhere to the diaphragms take them off and put them in the thread of the corresponding con necting rod The same number of diaphragm spacers must be mounted as were used for the previous assembly This is necessary in or der to ensur...

Страница 35: ...between the outer edge of the diaphragm 9 and the diaphragm recording 14 If the dis tance is not uniform you must re loosen the screws 19 and re align the diaphragm receiver so the distance is the same everywhere Before you finally tighten the diaphragms you are recom mended to move the diaphragm to the upper dead center by rotating the fan 16 13 Screw the new diaphragms 10 and 11 onto the connect...

Страница 36: ...perating and Installation Instructions english KNF 121690 121708 09 19 Final steps 1 Reconnect suction and pressure line to the pump 2 Reconnect the pump to the electricity supply If you have any questions about servicing call your KNF technical adviser contact data see www knf com ...

Страница 37: ...nnections and lines Remove blockage External valve is closed or filter is clogged Check external valves and filters Condensate has collected in pump head Detach the condensate source from the pump Flush pump see Chapter 8 2 1 Diaphragm or valve plates are worn Replace diaphragm and valve plates see Chapter 9 3 Tab 19 Flow rate pressure or vacuum too low The pump does not achieve the output specifi...

Страница 38: ...r valve plates are worn Replace diaphragm and valve plates see Chapter 9 3 Replaced diaphragms and valve plates Check that the spacers have been replaced onto the dia phragm screw thread Check head connection and hose connections for leaks Possibly carefully tighten the screws of the head cover crosswise Tab 20 Fault cannot be rectified If you are unable to determine any of the specified causes se...

Страница 39: ...s Accessories Order No Silencer Filter G 1 8 007006 Small flange connection for suction or pres sure side stainless steel KNF 16 046625 Hose connector G 1 8 for tube ID 9 029113 Sealing for hose connector 026906 Completely connectorized control cable analog or digital controlling On request Assembly key for stabilization diaphragm 116885 PWM analog voltage converter Function Smoothing of the speed...

Страница 40: ...or repairing a pump by KNF is a completed Decon tamination Form This is made available on the KNF website as a download To find the form select your country on the overview page www knf com You can find the Decontamination Form in the download area If you have questions please contact your sales partner contact data see www knf com ...

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