Electrical transmission or interconnection systems – Switching systems – Switch actuation
Reexamination Certificate
1999-11-15
2001-10-23
Scott, J. R. (Department: 2832)
Electrical transmission or interconnection systems
Switching systems
Switch actuation
C200S0110TC, C307S149000, C323S341000
Reexamination Certificate
active
06307283
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the U.S. national phase of PCT application PCT/EP98/00090 filed Jan. 9, 1998 with a claim to the priority of German patent application 19720617.4 itself filed May 16, 1997.
FIELD OF THE INVENTION
The invention relates to a position-signalling device for motor drives of step switches, tap changers or dipper coils.
BACKGROUND OF THE INVENTION
Position-signalling devices as components of the motor drive serve for remote indication of position, or to provide information regarding the respective current position of the step switch or the like.
Such devices detect this current position electrically and process the obtained information correspondingly. The processed information then becomes the starting point and the prerequisite for the current (remote) position reading, which for instance is done optically by a lamp indicator or a dial-type instrument.
Such position-signalling devices are known from the internal company papers “Motor Antriebe MA7”, (Motor Drive MA7), publication BA 40/90de-0391/2000 of the applicant. They consist of an array of signalling contacts which correspond to various operating positions of the step switch or the like and are arranged in a circle and can be switched on and off by a mobile sliding contact.
In practice numerous different variants are in use for processing the obtained information about the current position and are applicable to different situations.
Position-signalling arrays for lamp indicators switch with interruption from one signalling contact to the next. The mobile sliding contact and the signalling contacts of the contact path are connected through terminals.
Position-signalling devices for remote indication by means of dial-type instruments switch without interruption from one signalling contact to the next. For n operating positions n−1 step rheostats are built in between the signalling contacts. The beginning and the end of the contact path, as well as the mobile sliding contact are connected to terminals.
Position-signalling devices using a diode matrix deliver a coded processed signal, e.g. in BCD or Gray code.
Position-signalling devices for decimal lamp signals make possible a decimal reading.
In position-signalling devices with a break contact path the contact opens in the respective operational position.
According to the state of the art for each of the applications, special specifically designed signalling-contact arrays are made with special components tailored to the particular case. For instance in the embodiment for the remote reading by means of a dial-type instrument, as a rule a crossed coil instrument, the required individual rheostats are provided directly between the individual signalling contacts, which are swept by the sliding contact.
These known position-signalling devices, specialized for the respective type of application, have several disadvantages. On the one hand the manufacturing and the rating of the various signalling-contact arrays with their different components in various configurations are complicated and expensive. On the other hand it is not possible to adapt the position-signalling device in a flexible manner to changing requirements, which for instance could result from a short-term change of the manner in which the position indication is displayed, for instance when a lamp signal has to be replaced by a dial-type instrument with a crossed coil.
OBJECTS OF THE INVENTION
It is the object of the invention to provide a position-signalling device which can be constructed in a modular manner, simplifying the selection of the most various possibilities for the processing of information regarding the position of the step switch or the like, and thereby the remote reading, or display of this information.
SUMMARY OF THE INVENTION
According to the invention the position-signalling device consists of two physically separate subassemblies, which are electrically interconnected. These subassemblies include
a signalling-contact array or assembly for obtaining information about the respective operational position of the motor drive, and
a position-signalling module for processing the information corresponding to the desired manner of displaying the operational position of the motor drive.
The solution offered by the invention is particularly advantageous because of the universal construction of the entire position-signalling device, which no longer has to be tailored to the particular requirements of certain applications.
Due to the physical separation according to the invention between the information-collecting signalling-contacts array on the one hand, and the position-signalling module for information processing, which can be easily replaced, on the other hand, a simple adaptation to all industrial conditions is possible merely by replacing the position-signalling module. A further advantage of the invention consists in that the arrangement of the components required for information processing, such as rheostats (for dial-type instruments), diodes (for coded information) or relays(for break contact rows is eliminated from the actual signalling-contact array. This is a significant difference over the state of the art. The signalling contact array is thereby simplified and technologically becomes easier to manufacture, the manufacture of the above-mentioned components in the separate position-signalling module is also more favorable, even in the case of possibly required replacement of defective components during operation.
It is particularly advantageous that the easily replaceable position-signalling module can serve at the same time as the transfer point for the electric connection line leading to a remote display.
In a further particularly advantageous embodiment of the invention, the electric components in the separate position-signalling modules are each arranged and wired in such a manner that by simply rotating the corresponding plug connection by 180 degrees and repositioning on the corresponding module, the detected rotation sense of the passed-through operating positions can be changed.
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Motor Drive Unit MA 7 Operating Instructions, Maschinenfabrik Reinhausen, pp. 1-27, English and German, Jun. 1994.
Dohnal Dieter
Griesbacher Franz
Holmer Michael
Dubno Herbert
Maschinenfabrik Reinhausen GmbH
Scott J. R.
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