DE8802801U1 - Contactor star-delta switch - Google Patents

Description

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Siemens AG
Contactor star-delta switch

The innovation relates to a contactor star-delta switch with an electronic time relay, a series connection of an on button and an off button, a mains contactor, a star contactor and a delta contactor, which has connection terminals for a first, second, third and fourth connection point of a control circuit, which are used to connect the internal and customer-side wiring of the contactor star-delta switch.

Contactor star-delta switches of the aforementioned type are known from the Siemens NS 1987, 4/76 catalog. The circuit diagrams for the control circuits shown here show connection points of the contactor star-delta switch, for which a separate terminal block was used, which has connection terminals for the common internal and external customer connection. It is also possible to distribute the customer wiring to contactors and time relays without using terminal blocks.

The innovation is based on the task of creating a contactor star-delta switch whose connection is customer-friendly, simple and safe.

This task is solved in a control circuit of the type mentioned above by the fact that the connection terminals for the customer's connection in the first, second, third and fourth connection points can be clamped independently of the internal wiring and are arranged on the housing of the time relay. If the customer's connection terminals are arranged adjacent to the front of the housing of the time relay, they enable quick connection and rapid commissioning.

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α , 1 The drawing shows an embodiment of the invention, which is described in more detail below.

Show it:
FIG 1 shows the circuit diagram of a contactor star-delta switch.

FIG 1 shows the circuit diagram of a contactor star-delta switch 1 for button operation with mains connection. In detail, the connection of a time relay 2, an overload relay 3, a series connection of an on 4 and an off button 5, a mains contactor with its excitation coil 6, a star contactor with its excitation coil 7, a delta contactor with its excitation coil 8 and a fuse 9 is shown . The contactor star-delta switch 1 is connected to the mains supply voltage via the fuse 9 and the overload relay 3. The series connection consisting of the on 4 and off buttons 5 is connected on the input side to the contactor star-delta switch 1. The time relay 2 is connected downstream of the series connection at a connection point 14. The off button 5 is connected to a connection point 12 on the mains side and is connected to the on button 4 on the device side. A first 15 of the two normally open contacts 15 and 16 of the time relay 2 closes without delay after the time relay 2 responds and thereby excites the excitation coil 7 of the star contactor connected downstream via the normally closed contact 21 of the delta contactor. The other normally open contact 16 of the time relay 2, which excites the connected excitation coil 8 ( of the delta contactor with a delay, is connected to the first normally open contact 15 of the time relay 2 via the parallel circuit consisting of a normally open contact 19 of the star contactor and a normally open contact 17 of the mains contactor. On the same side, the second normally open contact 16 of the time relay 2 is also connected to the excitation coil 6 of the mains contactor. The other side of the normally open contact 16 is connected to the excitation coil 8 of the delta protection via the normally closed contact 20 of the star contactor.* The excitation coils of the time relay 2, the star contactor, the delta protection and the mains contactor are connected on the output side via a connection point 23 to

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a connection point 11, to which the neutral point conductor is connected. A line leads from the connection point between the on 4 and off buttons 5 to a connection point 13 of the time relay 2, which is connected via a further connection point 22 to a second contact 18 of the mains contactor, the latter being connected to the connection point 14 via its connection point 24 on the time relay 2. For the previously described connection points 11, 12, 13 and 14, there are connection terminals on the housing of the time relay 2, which are used exclusively for the customer's connection, independent of any internal wiring. The relevant connection terminals are arranged close together on the front of the housing of the time relay 2, as shown in Figure 2.

In the contactor star-delta switch 1 for permanent contact, the cable to connection point 13 is omitted, and a permanent contact generator is used instead of the on and off button 5.

The separate connections of the two contacts 15 and 16 of the Time relay 2 allows that in case of a short-term voltage failure

If permanent contact is made, none of the contactors remains switched on.

2 Protection claims
3/ Figure*/*

Claims (2)

88 6 3 O 8 2 OE Protection claims 1. Protective star-delta switch (1) with an electronic time relay (2), a series connection of an on button (4) and an off button (5), a mains protection, a star protection and a delta protection, which has connection terminals for a first (11), second (12), third (13) and fourth connection point (14) of a control circuit, which serve for the connection for the internal and customer-side wiring of the protective star-delta switch (1), characterized in that the connection terminals for the customer-side connection in the first (11), second (12), third (13) and fourth connection point (14) can be clamped independently of the internal wiring / \ and are arranged on the housing of the time relay (2). 2. Contactor star-delta switch according to claim 1, characterized in that the customer-side connection terminals are adjacent to the housing front of the Time relays (2) are arranged.