METHOD FOR DATA TRANSMISSION BETWEEN A PUMP ASSEMBLY AND A CONTROL DEVICE, AS WELL AS A CORRESPONDINGLY DESIGNED PUMP SYSTEM

• US 20090052281A1
• Filed: 07/15/2006
• Published: 02/26/2009
• Est. Priority Date: 07/29/2005
• Status: Active Grant

• Current Assignee: Grundfos Management A/S (POUL DUE Jensen's FOND)
• Original Assignee: Grundfos Management A/S (POUL DUE Jensen's FOND)
• Inventors: Nybo, Peter Jungklas, Jensen, Jorgen
• Granted Patent: US 9,595,999 B2
• Time in Patent Office: Days
• US Class Current: 367/81
• CPC Class Codes: F04D 13/0686 Mechanical details of the pump control unit pump control F04D15/00
• CPC Class Codes: F04D 13/0693 Details or arrangements of the wiring
• CPC Class Codes: H04B 2203/5416 by adding signals to the wave form of the power source
• CPC Class Codes: H04B 2203/5483 using coupling circuits
• CPC Class Codes: H04B 2203/5491 using filtering and bypassing
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines

Abstract

A method for data transmission between a pump assembly (2) and a control device (8) is provided, wherein the pump assembly (2) for the energy supply is connected via at least one electrical supply lead (10) to a frequency converter (14). The data transmission is effected via the electrical supply lead (10), and an evaluation of a data transmission signal (34) received by the pump assembly (2) or the control device (8) is only effected in low-disturbance regions of a carrier signal (22) formed by a supply current. A pump system designed for carrying out this method is also provided.

Claims

1-18. -18. (canceled)

19. A method for data transmission between a pump assembly (2) and a control device (8), wherein the pump assembly (2) for its energy supply is connected via at least one electrical supply lead (10) to a frequency converter (14), the method comprising:

effecting data transmission via the electrical supply lead (10), and

effecting an evaluation of a data transmission signal (34) received by the pump assembly (2) or by the control device (8) only in low-disturbance regions of a carrier signal (22) formed by a supply voltage.

20. The method according to claim 19, wherein the low-disturbance regions of the carrier signal (22) are certain frequency regions or temporal regions.

21. The method according to claim 19, wherein the data transmission and/or evaluation of the received data transmission signal (34) are deferred in a time of occurring disturbances (26) of the carrier signal (22), or the evaluation is effected in a manner such that the data transmission signal (34) is separated from occurring disturbances (26) of the carrier signal (22) by way of a signal separation.

22. The method according to claim 19, wherein the data transmission between the control device (8) and the supply lead (10) is effected via an inductive or capacitive coupling.

23. The method according to claim 19, wherein the data transmission and/or the evaluation of the data transmission signal (34) is deferred in moments of switching on and off of power switches of the frequency converter (14).

24. The method according to claim 19, wherein times in which disturbances (28) of the carrier signal (22) occur are automatically recognized, and the data transmission and/or the evaluation of the data transmission signal (34) are deferred during these times.

25. The method according to claim 24, wherein the times in which disturbances (26) of the carrier signal (22) occur are recognized by analysis of an electrical variable by frequency analysis or phase detection of the signal transmitted in the supply lead (10).

26. The method according to claim 25, wherein a reference signal (32) as well as a modulated signal (34) are transmitted via the supply lead (10) in a three-conductor system, for carrying out the analysis.

27. The method according to claim 19, wherein the data transmission is effected in a low-disturbance frequency region (f3) of the carrier signal (22), and wherein a minimization of disturbances is effected by an electrical filter (16) arranged between the frequency converter (14) and the pump assembly (2).

28. The method according to claim 27, wherein the frequency region (f3) in which the data transmission is effected is set at the control device (8) and/or the pump assembly (2) depending on the filter (16) applied, or the control device (8) and/or the pump assembly (2) automatically evaluate the frequency region (f3) for the data transmission, the filter region depending on the filter (16) applied.

29. The method according to claim 21, wherein the signal separation is effected in a manner such that disturbances (26), whose temporal duration is smaller than a temporal duration of a smallest information unit (40) to be transmitted in a course of data transmission, are ignored on evaluation of the data transmission signal (34).

30. A pump system comprising a pump assembly (2) and a control device (8) which is spatially separated from the pump assembly (2), wherein the pump assembly (2) comprises at least one electrical supply lead (10) for connection to a frequency converter (14),

wherein the pump assembly (2) and the control device (8) comprise communication modules, the modules being in communicating connection with one another for data transmission via the supply lead (10), and the modules being designed in a manner such that an evaluation of a data transmission signal (34) received by one of the communication modules is only effected in low-disturbance regions of a carrier signal (22) formed by the supply voltage.

31. The pump system according to claim 30, wherein the pump system is set up in a manner such that communication and/or evaluation of the data transmission signal (34) is deferred in a time of occurring disturbances (26) of the carrier signal (22).

32. The pump system according to claim 30, wherein the communication modules comprise a signal interruption means which defers the communication and/or evaluation of the data transmission signal (34) in times in which disturbances (26) of the carrier signal (22) occur.

33. The pump system according to claim 30, wherein at least one of the communication modules contains a signal analyzer having a form of a frequency analyzer or phase detector for recognizing disturbances (26) of the carrier signal (22).

34. The pump system according to claim 30, wherein the communication modules are designed in a manner such that a communication between the communication modules is effected in a frequency region (f3) in which harmonics of the carrier signal formed by the supply current are damped, and wherein an electrical filter (16) arranged between the frequency converter (14) and the control device (8) is provided for damping the harmonics.

35. The pump system according to claim 34, wherein the frequency region (f3) for the communication may be set at the control device (8) and/or the pump assembly (2) and/or wherein at least one of the communication modules is designed for automatic evaluation of the frequency region (f3) for the communication.

36. The pump system according to claim 30, wherein a signal transformer for inductive or capacitive signal transmission between the supply lead (10) and at least one of the communication modules of the control device (8) is arranged in the control device (8).