DE19628054A1 - Automatic protection for stuffing-box type drainage pumps - has current/voltage converter between one phase of supply and motor, whose output goes to two comparator systems, thence to relay - Google Patents

Automatic protection for stuffing-box type drainage pumps - has current/voltage converter between one phase of supply and motor, whose output goes to two comparator systems, thence to relay

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Publication number
DE19628054A1
DE19628054A1 DE1996128054 DE19628054A DE19628054A1 DE 19628054 A1 DE19628054 A1 DE 19628054A1 DE 1996128054 DE1996128054 DE 1996128054 DE 19628054 A DE19628054 A DE 19628054A DE 19628054 A1 DE19628054 A1 DE 19628054A1
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DE
Germany
Prior art keywords
motor
current
pump
relay
comparator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE1996128054
Other languages
German (de)
Inventor
Tadeusz Baczynski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Przed En Ct Sp Z O O
Original Assignee
Przed En Ct Sp Z O O
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Application filed by Przed En Ct Sp Z O O filed Critical Przed En Ct Sp Z O O
Publication of DE19628054A1 publication Critical patent/DE19628054A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0077—Safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
    • F04D15/0236—Lack of liquid level being detected by analysing the parameters of the electric drive, e.g. current or power consumption
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0827—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors responsive to underload or no-load, e.g. pump-off control circuits for pump motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Multiple Motors (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Protection Of Generators And Motors (AREA)

Abstract

The motor for a circulating pump has a two-level system and a time relay whose set of contacts is joined to an AC source. There is a current/voltage converter (1) in series between the supply to one motor phase and the input terminal of the contact set (2) for the protection system. The output of the converter is also joined to the input of a comparator system (5) for the peak motor current when idling and the input of another comparator system (6) for the peak overload current. The outputs of both systems are processed (7) into signals controlling a relay (9).

Description

Gegenstand der Erfindung ist ein System der selbsttätigen Sicherung von Umlauf- und Zirkulationspumpen vor dem Trockenlaufen und vor Überlastung, das insbesondere zur Anwendung beim Bau von stopfbüchsenlosen Pumpen bestimmt ist.The invention relates to a system of automatic backup of circulation and Circulation pumps before running dry and before overload, which is particularly useful for Construction of glandless pumps is intended.

Zur Sicherung stopfbüchsenloser Pumpen vor einem Trockenlaufen, was eine notwendige Bedingung für den Betrieb dieser Pumpen ist, weil ihre Keramik-Gleitlager stets mit Wasser geschmiert werden müssen, werden allgemein Druckschalter verwendet, die am Saugflansch der Pumpe angebaut und an die Steuerung des Pumpenmotorbetriebs angeschlossen sind.To secure glandless pumps from running dry, which is a necessary Condition for the operation of these pumps is because their ceramic plain bearings are always filled with water must be lubricated, pressure switches are generally used, on the suction flange attached to the pump and connected to the control of the pump motor operation.

Aus der polnischen Patentbeschreibung Nr. 110 881 ist ein System einer selbsttätigen Steuerung von Pumpen mittels eines Pegel-Stromrelais und eines Verzögerungsrelais mit einstellbarer Ansprechzeit bekannt.From Polish patent specification No. 110 881 is an automatic control system of pumps by means of a level current relay and a delay relay with adjustable Response time known.

Aus der polnischen Patentbeschreibung Nr. 144 958 ist ein System der selbsttätigen, zyklischen Ein- und Ausschaltung des Antriebsmotors einer Entwässerungspumpe bekannt, das einen Stromwandler, ein Zweipegel-Stromsteuergerät und ein zeitprogrammierbares Relais beinhaltet, das dadurch gekennzeichnet ist, daß das Zweipegel-Stromsteuergerät zum Ein- oder Ausschalten des Pumpenmotors, an den in den Spreisekreis des Pumpenmotors eingeschalteten Stromwandler angeschlossen und an das zeitprogrammierbare Relais zur zyklischen, kontinuierlichen Steuerung des Pumpenmotorbetriebs angekoppelt ist.From Polish patent specification No. 144 958 is a system of automatic, cyclical Switching on and off the drive motor of a drainage pump is known, the one Current transformer, a two-level current control device and a time-programmable relay includes, which is characterized in that the two-level current control device for one or Switching off the pump motor to the one switched into the price circle of the pump motor Current transformers connected and connected to the time-programmable relay for cyclical, continuous control of pump motor operation is coupled.

Die Lösung nach der Patentschrift 144 958 erfordert die Anwendung von Stromwandlern, was die Werkstoffkosten sowie den Ausführungsarbeitsaufwand erheblich erhöht und darüber hinaus praktisch nutzlos in bezug auf moderne stopfbüchsenlose Pumpen ist, bei denen als Sicherung bis jetzt die erwähnten Druckschalter allgemein verwendet werden. The solution according to patent specification 144 958 requires the use of current transformers, what the material costs as well as the execution workload increased considerably and above Furthermore, it is practically useless in relation to modern glandless pumps, in which as Fuse up to now the pressure switches mentioned are generally used.  

Das System der selbsttätigen Sicherung des Motors von Umlauf- und Zirkulationspumpen ist dadurch gekennzeichnet, daß es einen Strom-Spannungs-Wandler hat, der seriell zwischen die Leitung einer der Phasen der Wechselspannung und die Klemme des dieser Phase zugehörigen Schützes geschaltet ist, über welches Schütz der Pumpenmotor gespeist wird, wohingegen der Ausgang des erwähnten Wandlers an den Eingang des Komparatorsystems vom Spitzenwert des Pumpenmotor-Trockenlaufenstroms und den Eingang des Komparatorsystems vom Überlastungsstrom-Spitzenwert gleichzeitig angeschlossen ist, wobei die Ausgänge der erwähnten Komparatorsysteme über das Verarbeitungssystem der Impulssignale in ein kontinuierliches Signal an ein zeitabhängiges Verzögerungs-Ansprechsystem, das das Relais ansteuert, dessen Kontaktsatz seriell in den Kreis der Spule vom Schütz eingeschaltet ist, über das der Pumpenmotor gespeist wird, angeschlossen sind.The system of automatic protection of the motor of circulation and circulation pumps is characterized in that it has a current-voltage converter that is connected serially between the Line one of the phases of the AC voltage and the terminal of the associated with this phase Contactor is switched, via which contactor the pump motor is fed, whereas the output of the converter mentioned to the input of the comparator system from Peak value of the pump motor dry-running current and the input of the comparator system of the overload current peak value is connected at the same time, the outputs of the mentioned comparator systems via the processing system of the pulse signals in a continuous signal to a time-dependent delay response system that the relay controls, whose contact set is switched in series in the circuit of the coil by the contactor, via that the pump motor is powered.

Die Lösung laut Erfindung ermöglicht eine wirksame, vertrauenswürdige und zuverlässige Sicherung der Motoren von stopfenbüchsenlosen Pumpen sowohl vor Überlastung und vor dem Trockenlaufen der Pumpe als auch vor dem Ausfall der Speisespannung in der Meßphase oder in jeder sonstigen Phase. Die Lösung laut Erfindung ermöglicht das Schaffen eines universellen Systems der selbsttätigen Sicherung des Motors von Umlauf- und Zirkulationspumpen, in dem in Abhängigkeit von den Pumpenparametern mittels der Änderung von Einstellwerten des Eingangspotentials in jedem der zwei Komparatorsysteme eine Anpassung dieses Systems an den Betrieb mit einer beliebigen Pumpe aus der Typenreihe von Umlauf- und Zirkulationspumpen erhalten wird.The solution according to the invention enables an effective, trustworthy and reliable Securing the motors of plugless pumps both against overload and before The pump runs dry as well as before the supply voltage fails in the measuring phase or in every other phase. The solution according to the invention makes it possible to create one universal system of automatic protection of the engine from circulation and Circulation pumps, in which depending on the pump parameters by means of the change of set values of the input potential in each of the two comparator systems Adaptation of this system to the operation with any pump from the series of Circulation and circulation pumps are obtained.

Der Gegenstand der Erfindung ist an einem Ausführungsbeispiel mittels einer Abbildung, in der die Fig. 1 das Blockschaltbild des Systems laut Erfindung in der Struktur der Verbindungen zu dem Speisesystem der Umlauf- oder Zirkulationspumpe darstellt, erläutert, wobei der Gegenstand der Erfindung mit einer unterbrochenen Linie umgeben ist. Fig. 2 zeigt das Schaltbild einer beispielsweisen Realisierung des Systems gemäß der Erfindung.The subject matter of the invention is explained in an exemplary embodiment by means of an illustration, in which FIG. 1 shows the block diagram of the system according to the invention in the structure of the connections to the feed system of the circulation or circulation pump, the subject matter of the invention with a broken line is surrounded. Fig. 2 shows the diagram of the invention showing an exemplary implementation of the system according to.

Das System der selbsttätigen Sicherung des Motors von Umlauf- und Zirkulationspumpen vor einem Trockenlaufen und vor Überlastung laut Erfindung hat einen Strom-Spannungs-Wandler 1, der mit seinem Eingang in Reihe zwischen die Leitung der Phase W einer Drehstromspeisequelle der Wechselspannung und die dieser Phase W entsprechenden Eingangsklemme des Kontaktsatzes 2 vom Schütz eingeschaltet ist. Die anderen zwei Phasen U und V der Wechselspannung sind unmittelbar an die anderen Eingangsklemmen des Kontaktsatzes 2 vom Schütz, über das der Motor 3 der Pumpe 4 gespeist wird, angeschlossen. Der Ausgang des Strom-Spannungs-Wandlers 1 ist gleichzeitig an den Eingang des Komparatorsystems 5 vom Trockenlaufstrom-Spitzenwert sowie an den Eingang des Komparatorsystems 6 vom Überlastungsstrom-Spitzenwert angeschlossen. Die Ausgänge der beiden Komparatorsysteme 5 und 6 vom Trockenlaufstrom- und Überlastungsstrom-Spitzenwert sind an die Eingänge des Verarbeitungssystems 7 von Impulssignalen in ein kontinuierliches Signal angeschlossen, und der Ausgang des Systems 7 ist an das zeitabhängige Verzögerungs-Ansprechsystem 8 angeschlossen, das das Relais 9 ansteuert. Der Öffnungskontaktsatz des Relais 9 ist an die Wechselstromquelle der Phasenspannung U und W, die den Motor 3 der Pumpe 4 einerseits über den Ausschalter 10 des Betriebs vom Motor 3 der Pumpe 4, andererseits dagegen über den bimetallischen Ausschalter 11 und die Spule 12 vom Schütz, über welches Schütz der Motor 3 der Pumpe 4 aus der Dreiphasen-Wechselspannungs-Quelle U, V und W gespeist wird, angeschlossen.The system of automatically securing the motor of circulation and circulation pumps against dry running and against overload according to the invention has a current-voltage converter 1 , which has its input in series between the line of the phase W of a three-phase supply source of the AC voltage and that of this phase W. the corresponding input terminal of contact set 2 is switched on by the contactor. The other two phases U and V of the AC voltage are connected directly to the other input terminals of the contact set 2 from the contactor, via which the motor 3 of the pump 4 is fed. The output of the current-voltage converter 1 is simultaneously connected to the input of the comparator system 5 from the dry-running current peak value and to the input of the comparator system 6 from the overload current peak value. The outputs of the two comparator systems 5 and 6 from the dry-running current and overload current peak are connected to the inputs of the processing system 7 of pulse signals into a continuous signal, and the output of the system 7 is connected to the time-dependent delay response system 8 , which the relay 9 controls. The opening contact set of the relay 9 is to the alternating current source of the phase voltage U and W, which the motor 3 of the pump 4 on the one hand via the switch 10 of the operation of the motor 3 of the pump 4 , on the other hand via the bimetallic switch 11 and the coil 12 from the contactor, Via which contactor the motor 3 of the pump 4 is fed from the three-phase AC voltage source U, V and W.

Das System gemäß der Erfindung arbeitet folgendermaßen.The system according to the invention works as follows.

Der Strom einer der Phasen U, V, W der Dreiphasenwechselspannung, genau der Phase W, der durch den Motor 3 fließt, wird im Wandler 1 in ein sinusförmiges Spannungssignal gewandelt, das im Komparatorsystem 5 mit dem durch das Potentiometer 13 vorgegebenen Leerlaufstromwert des in Frage kommenden Motors 3 der Pumpe 4, und im System des anderen Komparators 6 mit dem vorgegebenen Überlastungsstromwert des erwähnten Motors, der durch das andere Potentiometer 14 vorgegeben wurde, verglichen. Die Ausgangssignale aus den Komparatorsystemen 5 und 6 haben nach Erreichen der mit den Potentiometern 13, 14 eingestellten Werte die Form von Impulsverläufen. Das System 7 verarbeitet Impulssignale aus den Ausgängen der Komparatorsysteme 5 und 6 in ein kontinuierliches Signal der Überschreitung. Das zeitabhängige Verzögerungs-Ansprechsystem 8 hat die Aufgabe, die Dauer des kontinuierlichen Signals der Überschreitung von normativen Werten des durch den Motor 3 durchfließenden Stroms, mit Bestandteilen dieses Systems 8 festgelegt, zu messen und wenn dieses Signal über den eingestellten Zeitwert dauert, so erfolgt das Ansprechen dieses Systems und die Öffnung des Kontaktsatzes vom Relais 9 und dadurch die Öffnung des Speisekreises von der Spule 12 des Schützes, über das der Motor 3 der Pumpe 4 gespeist wird. Falls die Zeitdauer des kontinuierlichen Signals der Überschreitung der Einstellwerte in den beiden Komparatorsystemen 5 und 6 kürzer als die Verzögerungs-Ansprechzeit des zeitabhängigen Verzögerungs-Ansprechsystems 8 ist, so wird das Zeitsystem bis zum Schwund dieses Signals nicht ansprechen und das Messen der Zeit für eine nachfolgende Überschreitung der Einstellwerte, die auftreten kann, beginnt von neuem, weil das ganze Sicherungssystem nach dem Schwund des Signals der ersten Überschreitung auf Null gesetzt wurde. Das System laut Erfindung verwirklicht auch die Sicherungsfunktion für den Motor 3 der Pumpe 4 vor Folgen des Spannungsausfalls einer der speisenden Phasen U, V und W. Falls der Spannungsausfall in der Meßphase W, die eine der den Motor 3 speisenden Phasen U, V, W ist, erfolgt, so reagiert das System laut Erfindung auf diesen Spannungsausfall wie auf das Trockenlaufen der Pumpe 4. Wenn dagegen der Spannungsausfall zumindest in einer der sonstigen Phasen erfolgt, dann reagiert das System laut Erfindung wie auf die Überlastung des Betriebs der Pumpe 4.The current of one of the phases U, V, W of the three-phase AC voltage, precisely the phase W, which flows through the motor 3 is converted in the converter 1 into a sinusoidal voltage signal, which in the comparator system 5 has the no-load current value specified by the potentiometer 13 in question coming motor 3 of the pump 4 , and in the system of the other comparator 6 with the predetermined overload current value of the mentioned motor, which was predetermined by the other potentiometer 14 , compared. After reaching the values set with the potentiometers 13 , 14 , the output signals from the comparator systems 5 and 6 take the form of pulse curves. The system 7 processes pulse signals from the outputs of the comparator systems 5 and 6 into a continuous signal of exceedance. The time-dependent delay response system 8 has the task of measuring the duration of the continuous signal of exceeding normative values of the current flowing through the motor 3 , with components of this system 8 , and if this signal lasts over the set time value, this is done Response of this system and the opening of the contact set from the relay 9 and thereby the opening of the supply circuit from the coil 12 of the contactor, via which the motor 3 of the pump 4 is fed. If the duration of the continuous signal of exceeding the set values in the two comparator systems 5 and 6 is shorter than the delay response time of the time-dependent delay response system 8 , the time system will not respond until this signal fades and the time measurement for a subsequent one Exceeding the set values, which can occur, starts again because the whole security system was set to zero after the signal of the first exceeding faded. The system according to the invention also realizes the safety function for the motor 3 of the pump 4 before the consequences of the voltage failure of one of the feeding phases U, V and W. If the voltage failure in the measuring phase W, that of the phases 3 , U, V, W feeding the motor has occurred, the system according to the invention reacts to this voltage failure as to the pump 4 running dry. If, on the other hand, the voltage failure occurs at least in one of the other phases, then the system according to the invention reacts as if the pump 4 was overloaded.

Claims (1)

System der selbsttätigen Sicherung des Motors von Umlauf- und Zirkulationspumpen, das ein Zweipegelsystem und ein Zeitrelais beinhaltet, dessen Kontaktsatz an die Wechselspannungsquelle angeschlossen ist, die den Pumpenmotor über einen Ausschalter der Handbetätigung der Pumpe sowie durch einen thermischen Ausschalter und eine Spule des Schützes, das die Pumpenmotorklemmen an die Speisespannungsquelle anschließt, gekennzeichnet dadurch, daß es einen Strom-Spannungs-Wandler (1) hat, der seriell zwischen die Leitung einer der Phasen (U, V, W) der Speisespannung des Motors (3) der Pumpe (4) und die Eingangsklemme des Kontaktsatzes (2) des Schützes, das zu dieser Phase (U, V, W) gehört, angeordnet ist, wobei der Ausgang dieses Wandlers (1) gleichzeitig an den Eingang eines Komparatorsystems (5) für den Leerlauf-Spitzenwert des Motors (3) der Pumpe (4) sowie an den Eingang eines Komparatorsystems (6) für den Überlaststrom-Spitzenwert angeschlossen ist, wobei die Ausgänge der beiden Komparatorsysteme (5 und 6) über ein Verarbeitungssystem (7) der Impulssignale in ein kontinuierliches Signal an ein zeitabhängiges Verzögerungs-Ansprechsystem (8) geschaltet sind, das das Relais (9) ansteuert.System of automatic protection of the motor of circulation and circulation pumps, which includes a two-level system and a timing relay, the contact set of which is connected to the AC voltage source, which connects the pump motor via a switch for manual operation of the pump, as well as a thermal switch and a coil of the contactor connects the pump motor terminals to the supply voltage source, characterized in that it has a current-voltage converter ( 1 ) which connects serially between the line of one of the phases (U, V, W) of the supply voltage of the motor ( 3 ) of the pump ( 4 ) and the input terminal of the contact set ( 2 ) of the contactor belonging to this phase (U, V, W) is arranged, the output of this converter ( 1 ) simultaneously being connected to the input of a comparator system ( 5 ) for the no-load peak value of the Motors ( 3 ) of the pump ( 4 ) and to the input of a comparator system ( 6 ) for the overload current peak value, the Outputs of the two comparator systems ( 5 and 6 ) are connected via a processing system ( 7 ) of the pulse signals into a continuous signal to a time-dependent delay response system ( 8 ) which controls the relay ( 9 ).
DE1996128054 1995-07-14 1996-07-11 Automatic protection for stuffing-box type drainage pumps - has current/voltage converter between one phase of supply and motor, whose output goes to two comparator systems, thence to relay Withdrawn DE19628054A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL95309676A PL176270B1 (en) 1995-07-14 1995-07-14 System for automatically protecting motors of circulating and recirculating pumps

Publications (1)

Publication Number Publication Date
DE19628054A1 true DE19628054A1 (en) 1997-01-16

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DE1996128054 Withdrawn DE19628054A1 (en) 1995-07-14 1996-07-11 Automatic protection for stuffing-box type drainage pumps - has current/voltage converter between one phase of supply and motor, whose output goes to two comparator systems, thence to relay

Country Status (2)

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DE (1) DE19628054A1 (en)
PL (1) PL176270B1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001011748A1 (en) * 1999-08-04 2001-02-15 Ksb Aktiengesellschaft Malfunction detection of a machine driven by an electric motor
DE10010290A1 (en) * 2000-03-02 2001-09-06 Abb Patent Gmbh Electronic overload relay is combined with supply contactor has electronic components mounted on common PCB
DE10101099A1 (en) * 2001-01-12 2002-07-18 Schmalenberger Gmbh & Co Monitoring process for dry running of a delivery pump for fluid media disconnects motor if threshold current value is exceeded
EP1426621A1 (en) * 2002-12-05 2004-06-09 Bogemar, S.L. Electric pump operation control device
DE102008029910A1 (en) * 2008-06-24 2009-12-31 BSH Bosch und Siemens Hausgeräte GmbH Method for detecting the load condition of a pump
DE102009035276A1 (en) * 2009-07-29 2011-02-10 Spinflow Gmbh Control and control method for electric water pumps
DE112005001075B4 (en) * 2004-05-13 2011-12-29 Itt Manufacturing Enterprises, Inc. (N.D.Ges.D. Staates Delaware) Torque-controlled pump protection device with mechanical loss compensation

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001011748A1 (en) * 1999-08-04 2001-02-15 Ksb Aktiengesellschaft Malfunction detection of a machine driven by an electric motor
DE10010290A1 (en) * 2000-03-02 2001-09-06 Abb Patent Gmbh Electronic overload relay is combined with supply contactor has electronic components mounted on common PCB
DE10101099A1 (en) * 2001-01-12 2002-07-18 Schmalenberger Gmbh & Co Monitoring process for dry running of a delivery pump for fluid media disconnects motor if threshold current value is exceeded
DE10101099B4 (en) * 2001-01-12 2006-09-14 Schmalenberger Gmbh & Co Method for monitoring the dry running of a feed pump and the feed pump operating according to the method
EP1426621A1 (en) * 2002-12-05 2004-06-09 Bogemar, S.L. Electric pump operation control device
DE112005001075B4 (en) * 2004-05-13 2011-12-29 Itt Manufacturing Enterprises, Inc. (N.D.Ges.D. Staates Delaware) Torque-controlled pump protection device with mechanical loss compensation
DE112005001075B9 (en) * 2004-05-13 2012-05-10 Itt Manufacturing Enterprises, Inc. (N.D.Ges.D. Staates Delaware) Torque-controlled pump protection device with mechanical loss compensation
DE102008029910A1 (en) * 2008-06-24 2009-12-31 BSH Bosch und Siemens Hausgeräte GmbH Method for detecting the load condition of a pump
DE102008029910B4 (en) * 2008-06-24 2014-01-16 BSH Bosch und Siemens Hausgeräte GmbH Method for detecting the load condition of a pump
DE102008029910C5 (en) * 2008-06-24 2020-03-05 BSH Hausgeräte GmbH Method for recognizing the load status of a pump
DE102009035276A1 (en) * 2009-07-29 2011-02-10 Spinflow Gmbh Control and control method for electric water pumps

Also Published As

Publication number Publication date
PL309676A1 (en) 1997-01-20
PL176270B1 (en) 1999-05-31

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