CN2290952Y

CN2290952Y - Voltage reducing starter

Info

Publication number: CN2290952Y
Application number: CN 96233075
Authority: CN
Inventors: 刘军
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-05-08
Filing date: 1996-05-08
Publication date: 1998-09-09
Anticipated expiration: 2006-05-08

Abstract

The utility model relates to a voltage reducing starter for a motor. The utility model is provided with a time delay protecting relay bSJ. The time delay protecting relay bSJ is composed of an electric ring Q, and normally closed contacts C and D. A coil Q is connected with a coil of a starting alternating current contactor QC in parallel. The B terminal of the coil Q is connected with the normally open contact of the QC and a starting button QA, and the A terminal of the coil Q is connected with a normally closed contact of an intermediate relay ZJ. The C terminal of the normally closed contact of the bSJ is connected with a stopping button TA, and the D terminal of the normally closed contact of the bSJ is connected with the starting button QA, the normally open contact of a starting alternating current contactor QC, the normally open contact of a time relay SJ and the normally open contact of the intermediate relay ZJ. When the alternating current contactor is not stopped or is not converted to the operating state by some reasons, the bSJ can do action within the set time; thus, a power supply can be switched off.

Description

The reduced voltage starting device

The utility model is relevant with the electric motor starting protective device.

Traditional electric motor starting protective device to overload, the relaying protection of motor, start and the peak current of hiding generally is by the time relay, auxiliary relay and A.C. contactor are realized.Owing to the undesirable protection that is only limited to operating protection, has ignored start-up period of above-mentioned device action protection, break down, cause starting not stop or when not being converted to operation, often burn motor and starting equipment when the loop.

The purpose of this utility model provides a kind of simple in structure, and is with low cost, and start protection is reliable, do not influence the reduced voltage starting device of motor normal starting running.

The utility model comprises thermal relay RJ, stop button TA, starting button QA, time relay sj, middle relay ZJ, starting A.C. contactor QC, AC contactor SC.Increase a delay protection relay bSJ newly.BSJ has a coil Q, and two terminals are A, B; Normally-closed contact C, D are arranged.Coil Q is in parallel with starting ac contactor coil QC, its B termination starting A.C. contactor normally opened contact and starting button QA, its A termination auxiliary relay normally-closed contact.The C termination stop button TA of the normally-closed contact of bSJ, its D termination starting button QA, the normally opened contact of starting A.C. contactor, the normally opened contact of time relay sj, auxiliary relay normally opened contact.

The utility model also can comprise change over switch HK.At this moment, the D of the normally-closed contact of bSJ end connects auxiliary relay coil ZJ1 one end through change over switch HK (stopping), connects the auxiliary relay normally opened contact, connects the normally opened contact of starting button QA and starting A.C. contactor QC.The normally opened contact other end of intermediate relay ZJ 1 connects time relay sj coil and normally opened contact through change over switch HK (automatically), connect intermediate relay ZJ 2 normally opened contacts, the normally opened contact other end of ZJ1 connects operation button LA and intermediate relay ZJ 2 normally opened contacts through HK (manually).

The utility model is simple in structure, only needs to insert in traditional reduced voltage starting device newly-designed bSJ delay protection relay.BSJ is simple in structure, and is with low cost, is one four end member spare.Form by a coil and a pair of normally-closed contact; can improve the decompression starting case of various series easily; when certain reason does not stop the starting A.C. contactor of starter box or be not converted to operation; the bSJ delay protection relay of setting moves at the appointed time; time-delay disconnects normally-closed contact C; D, thus control power supply TA end disconnected, force starting A.C. contactor QC coil losing electricity and stop the step-down running.Change by normal condition to running as motor starting, bSJ delay protection device does not influence its service behaviour.

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is an another kind of circuit structure diagram of the present utility model.

Fig. 3 is a kind of bSJ delay protection device structure chart.

Embodiment 1:

This example is an XJ0 series auto-induction voltage-reduced starting device.

The utility model is by fuse RT1, RT2, and thermal relay RJ, stop button TA, starting button QA, time relay sj, intermediate relay ZJ, starting A.C. contactor QC, AC contactor SC, delay protection relay bSJ forms.Coil Q and normally-closed contact C, D that bSJ can use the TS7 type time relay form (as shown in Figure 3).

When pressing starting button QA, start A.C. contactor QC, time relay sj, delay protection relay TS7 coil are subjected to electricity work simultaneously, and motor D begins brownout operation.SJ is timing closing normally opened contact E, F after the arrival stipulated time, connects auxiliary relay coil ZJ.ZJ is subjected to; Its normally-closed contact ZJ-1 disconnects starting A.C. contactor QC, SJ and TS7 delay protection relay coil, at this moment proceed-to-send.Operation contactor SC coil, the operation of motor total head are connected in ZJ-2 normally opened contact self-locking time relay sj contact, ZJ-3 normally opened contact.

Starting A.C. contactor QC is not disconnected thereby when not being converted to operation, the TS7 delay protection device of setting moves at the appointed time as certain reason, its normally-closed contact C, D disconnect control power supply TA end, force the QC coil losing electricity and stop the step-down running.

Embodiment 2:

The utility model is by fuse 4RD1,5RD, thermal relay RJ; stop button TA, starting button QA, operation button LA; change over switch HK; time relay sj, intermediate relay ZJ 1, ZJ2; starting A.C. contactor QC; AC contactor XLC, starting delay protection relay bSJ, autotransformer IYB forms.

1. change over switch HK connects from movable contact.

Press starting button QA; starting contactor QC coil; the time relay sj coil; intermediate relay ZJ 1 coil and bSJ delay protection device coil are subjected to electricity work simultaneously; motor begins the normally opened contact timing closing at the appointed time of reduced voltage starting time relay sj; connect intermediate relay ZJ 2 coils; the ZJ2 normally-closed contact disconnects QC contactor coil and bSJ coil; proceed-to-send; ZJ2 normally opened contact closure; connect operation contactor XLC coil by QC contactor normally-closed contact, and by XLC normally-closed contact relay opening time SJ, motor begins the total head operation.As because of start the back time relay sj; intermediate relay ZJ 1, ZJ2; loop-type XLC ac contactor circuit fault; when causing starting not to be converted to operation; the bSJ delay protection relay of setting moves at the appointed time; its normally closed some C, D disconnect the control power supply of stop button TA, make starting contactor QC coil losing electricity and the work that stops, thereby reach the purpose of start protection.

2. change over switch HK connects manual contact.

When change over switch HK connected manual contact, time relay sj was not worked, and presses starting by QA, and ZJ1, bSJ are subjected to simultaneously.Press LA operation button when treating the backspace of major loop starting current; the ZJ2 coil is subjected to electricity work; the normally closed point of ZJ2 disconnects starting contactor QC and protection relay bSJ coil; proceed-to-send; ZJ2 is often made war closed by the normally closed some connection of QC operation contactor XLC coil; motor begins the total head operation; as because of start the back intermediate relay ZJ 1; ZJ2; operation button LA is not pressed in contactor XLC loop fault or operate miss is not converted to when moving it; the bSJ delay protection relay of setting moves at the appointed time; bSJ time-delay coil and QC coil losing electricity and the work that stops, thereby the start protection effect when reaching manual.

Claims

1; the reduced voltage starting device; comprise thermal relay RJ, stop button TA, starting button QA; time relay sj; intermediate relay ZJ, starting A.C. contactor QC, AC contactor SC; it is characterized in that having delay protection relay bSJ; bSJ is by coil Q, normally-closed contact C, and D forms; coil Q is in parallel with starting ac contactor coil QC; normally opened contact and the starting button QA of its B termination starting A.C. contactor QC, its A termination intermediate relay ZJ normally-closed contact, the C termination stop button TA of the normally-closed contact of bSJ; its D termination starting button QA; the normally opened contact of starting A.C. contactor QC, the normally opened contact of time relay sj, the normally opened contact of intermediate relay ZJ.

2, reduced voltage starting device according to claim 1, it is characterized in that also comprising change over switch HK, the D end of the normally-closed contact of bSJ connects the end of auxiliary relay coil ZJ1 through change over switch HK (stopping), connect intermediate relay ZJ 1 normally opened contact, connect the normally opened contact of starting button QA and starting A.C. contactor QC, (automatically) connects time relay sj coil and normally opened contact to the normally opened contact other end of intermediate relay ZJ 1 through change over switch HK, connect intermediate relay ZJ 2 normally opened contacts, the normally opened contact other end of ZJ1 connects operation button LA and intermediate relay ZJ 2 normally opened contacts through change over switch HK (manually).