CN202856669U

CN202856669U - Six dragged by two type motor soft starting device

Info

Publication number: CN202856669U
Application number: CN2012205733946U
Authority: CN
Inventors: 梁夏军
Original assignee: China Light Industry Nanning Design Engineering Co Ltd
Current assignee: China Light Industry Nanning Design Engineering Co Ltd
Priority date: 2012-11-02
Filing date: 2012-11-02
Publication date: 2013-04-03
Anticipated expiration: 2022-11-02

Abstract

The utility model discloses a six dragged by two type motor soft starting device. The six dragged by two type motor soft starting device comprises a primary circuit portion and a secondary control circuit portion. The primary circuit comprises two portions, wherein the first portion is a direct starting circuit of six motors, and the second portion is a soft starting circuit. The direct starting circuit is composed of six sets of main circuit breakers, main contactors, current transformers and thermorelays. The soft starting circuit comprises two soft starting devices, two circuit breakers, nine contactors, and two current transformers. The first portion and the second portion are connected through cables, and switched through the main contactors and starting contactors. In the secondary control circuit, a PLC serves as the core, the six motors are controlled by the PLC separately through intermediate relays, and the motors are started successively, so the advantage of good circuit reliability can be realized.

Description

Two drag six electric motor soft starters

Technical field

The utility model relates to a kind of Start Technology, and particularly two soft starter devices drag the starting device of six electric motor startings.

Background technology

Along with the development of power electronic technology, soft starter device is more and more in the application of factory.The start mode of motor has a variety of in the factory: across-the-line starting, auto-induction voltage-reduced starting, the starting of star triangle, and soft start, varying frequency starting etc., numerous.

Wherein soft starter device with its smooth starting, reduce starting current to the impact of electrical network, guarantee that the advantage such as reliably starting of motor becomes the preferential selection of electric motor starting.

Simultaneously, a lot of production controls, for example the automatic control level of mechanical industry, light industry, chemical industry is also more and more higher.For example in the sugar industry in Guangxi, used the DCS system in the production line of a lot of sugar refinery.The DCS system is also more and more to the requirement of electric motor starting and control, but the starting of many motors is owing to needing electric component many, complicated operation, sometimes also easily cause error, so, cost and operation are easy to be considered for saving, and increasing owner tends to adopt the start-up program of " drag many ".

Summary of the invention

The starting device that the purpose of this utility model provides a kind of " two drag six electric machine soft startings " satisfies user's requirement, in order to save cost and handled easily.

The technical solution of the utility model is achieved in that

Two drag six electric motor soft starters, it is characterized in that: comprise primary circuit part and secondary control loop part;

Described primary circuit can be divided into two parts, and first is the across-the-line starting loop of six motors, and second portion is soft starting loop; Described across-the-line starting loop is comprised of 6 cover main circuit breakers, main contactor, current transformer and thermal relay; Described soft starting loop comprises two soft starter devices, two circuit breakers and 9 contactors, two current transformers;

First is connected a part and connects by cable with second portion, switch by main contactor and starting contactor;

1～6 motor terminals of described primary circuit are connected with 6 main contactor K1～K6 respectively, and the leading-out terminal of main contactor is drawn out to respectively two cover starting device starting contactor SK1～SK6 leading-out terminals of soft starting loop with cable;

It is the achieve a butt joint control of tentaculum of core that described secondary control loop partly adopts PLC, by the starting contactor SK1～SK6 of PLC 3 selection contactor SK7～SK9 of control and 1～6 motor; Two soft starter devices can be for subsequent use each other;

In above-mentioned, the PLC of secondary control loop part realizes control SK1～9 contactor divide-shut brakes by different conditions, thereby realize the selection starting to 6 motors, SK1～6 are the electric motor starting contactor, contactor is selected for soft starter device in SK7～9, can carry out scene/DCS and control selection in start loop.

In above-mentioned, described six capacity motors are identical, and perhaps capacity is not identical, in 1～2 class of national standard capacity.

The advantage of this circuit is that reliability is high, and two soft starter devices can be for subsequent use each other.Be that a soft starter device drags respectively three electric motor startings in the time of normal, in the time of a soft starter device fault wherein, other one can drag six electric motor startings.

Description of drawings

Below in conjunction with drawings and Examples the utility model structure is described.

Fig. 1 is the primary connection figure of the utility model two starting device of dragging six electric machine soft startings.

Fig. 2, Fig. 3 are that the utility model two drags the linear quadratic control block diagram in the starting device of six electric machine soft startings.

Embodiment

Of the present utility model two drag the starting device of six electric machine soft startings to comprise primary circuit part and secondary control loop part.

Described primary circuit is divided into again two parts, referring to Fig. 1.First is the across-the-line starting loop feature of six motors, and second portion is the soft starting circuit part, and described across-the-line starting part is comprised of main circuit breaker MCB1～MCB6, main contactor K1～K6; 1～6 motor terminals is connected with 6 circuit breakers, main contactor K1～K6 respectively, and the control end of main contactor K1～K6 respectively outgoing cable is connected with the leading-out terminal of two cover starting device starting contactor SK1～SK6.

Described soft starting loop partly comprises 6 starting contactor SK1～SK6,3 selection contactor SK7～SK9 and two starting circuit breaker MCB7, MCB8 and two soft starters, and two soft starter devices can be for subsequent use each other.

First is connected a part and connects by cable with second portion, contactor switches.

Above-described six capacity motors are identical, and perhaps capacity is not identical, and are too large but capacity should not differ, and generally are advisable with interior with 1～2 class of national standard capacity.

Described linear quadratic control part: the linear quadratic control part is take PLC as core; Referring to Fig. 2, Fig. 3.PLC controls SK1～9 contactor divide-shut brakes by the control auxiliary relay, thereby realizes the selection starting to 6 motors, and SK1～6 are the electric motor starting contactor, and contactor is selected for soft starter device in SK7～9.Main contactor K1～the K6 of 1～6 motor of secondary control loop control can carry out scene/DCS and control selection in start loop.

First is motor operation major loop among Fig. 1, and is fairly simple, matches corresponding breaker of plastic casing, contactor according to capacity motor.This part draws two return cable, and a return cable causes motor, and an other return cable causes second portion.

Second portion is the electric motor starting loop, comprises two breaker of plastic casing, two soft starter devices, nine contactors.

Starting system mainly comprises two soft starter devices, and soft starter device can be selected according to root maximum motor capacity inlet wire.

Below tell about the process that starts to work of motor:

1～6# motor is in order starting respectively.1～3# motor is mainly started by the 1# soft starter device; 4～6# motor is mainly started by the 2# soft starter device.Wherein 1～3# motor can only start 1 at every turn, and the starting interval is according to the time requirement setting of starting device.The starting of 4～6# motor too.1#, 2# soft starter device are for subsequent use each other by SK8.

When starting 1# motor, after circuit breaker MCB1,7 closed, SK7, SK1 closed by PLC control, 1# soft starter device starting 1# motor.Start complete after, PLC drops into by secondary circuit control K1, SK1 disconnects, motor normally moves.

Start complete after, soft starter device withdraws from, thus motor turns by main circuit power supply and enters normal operating condition.

After the blanking time of regulation, can again start an other motor.

Fig. 2 is starting control loop block diagram.Can manually control and automatically control.Manually control can realize on-site manual control.Respectively SK1～6 contactor coils are started control by PLC output among this figure.

Fig. 3 is the PLC control block diagram.Respectively starting contactor SK1～SK6 and selection contactor SK7～SK9 are controlled.

Claims

1. one kind two is dragged six electric motor soft starters, it is characterized in that: comprise primary circuit part and secondary control loop part, described primary circuit can be divided into two parts, and first is the across-the-line starting loop of six motors, and second portion is soft starting loop; Described across-the-line starting loop is comprised of 6 cover main circuit breakers, main contactor, current transformer and thermal relay; Described soft starting loop comprises two soft starter devices, two circuit breakers and 9 contactors, two current transformers;

It is the achieve a butt joint control of tentaculum of core that described secondary control loop partly adopts PLC, by the starting contactor SK1～SK6 of PLC 3 selection contactor SK7～SK9 of control and 1～6 motor; Two soft starter devices can be for subsequent use each other.

2. as claimed in claim 1 two drag six electric motor soft starters, it is characterized in that: the PLC of secondary control loop part realizes control SK1～9 contactor divide-shut brakes by different conditions, realizes the selection starting to 6 motors.

3. as claimed in claim 1 two drag six electric motor soft starters, it is characterized in that: the secondary control loop part can be carried out scene/DCS and be controlled selection in start loop.

4. as claimed in claim 1 two drag six electric motor soft starters, it is characterized in that: described six capacity motors are identical, and perhaps capacity is not identical, in 1～2 class of national standard capacity.