CN201426106Y

CN201426106Y - Starting and running control device for electromotor

Info

Publication number: CN201426106Y
Application number: CN2009200722125U
Authority: CN
Inventors: 侯时云
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2009-05-14
Filing date: 2009-05-14
Publication date: 2010-03-17
Anticipated expiration: 2019-05-14

Abstract

The utility model discloses a starting and running control device for an electromotor, which not only can carry out overload protection to the electromotor, but also can prevent tripping caused by heavy load starting. The control device comprises a main loop and a control loop; the control loop comprises an overload protection module and an anti-tripping module connected with the automatic switchof the overload protection module; the electrification of an intermediate relay is subjected to delay control through a time relay of the anti-tripping module, so that the main contact of the immediate relay in the main control loop is closed; and a thermorelay is not electrified, so that the effect of preventing the tripping is achieved, thereby not only ensuring the normal running of the electromotor, but also improving the work efficiency.

Description

The motor start-up operating control device

Technical field

The utility model relates to the overload protection technology of motor, more particularly, relates to a kind of motor start-up operating control device.

Background technology

The startup operating control device of existing low pressure asynchronous motor adopts the comprehensive motor start-up controller that is formed by combining by bimetal thermal relay, A.C. contactor, automatic air-break switch, circuit breaker usually.In actual use, the main components and parts of this startup operating control device---the type selecting of thermal relay is to match by the twice of motor rated current.Therefore, when the normal No Load Start of motor, thermal relay can overcome the bigger starting current of motor; In the normal course of operation behind motor start-up; if the excessive motor rated current that surpasses of line current; the bimetallic sector-meeting heating of this thermal relay; thereby make deform and back down the protection contact; disconnect control loop by A.C. contactor this moment; thereby make its main circuit outage, for motor provides overload protection.Concrete operation principle as shown in Figure 1 and Figure 2; when this starts the hand switch SF closure of overload protection module 11 of operating control device or automatic switch KAKA when closed; ac contactor coil KM gets; the A.C. contactor main contacts KM-1 closure of major loop; make thermal relay KT energising come into operation; at this moment, motor D is unloaded just to be started, and thermal relay KT can overcome the starting current of motor D.If the excessive rated current that surpasses motor D of running current, thermal relay KT action, thermal relay normally closed contact KT-1 disconnects in the control loop; make ac contactor coil KM dead electricity; at this moment, the main contacts KM-1 of major loop disconnects, thereby provides operating overload protection for motor D.

But, it is unavoidable that analogue such as similar jumping electricity takes place in the production process of sealing-tape machine or disintegrating machine, in case take place to jump, can produce full material on the sealing-tape machine or in the storehouse of disintegrating machine, restart this moment the overload phenomenon can take place, motor D starts the immediate current produced and can exceed surplus the rated current ten times, and reach start-up time about two minutes sometimes, the bimetal leaf of thermal relay KT generates heat immediately and moves, normally-closed contact KT-1 disconnects in the control loop, make ac contactor coil KM dead electricity, cause the main contacts KM-1 of major loop to disconnect, make the firm startup of motor D will jump electricity, finally cause the heavy load starting failure.

The utility model content

At the above-mentioned shortcoming that exists in the prior art, the purpose of this utility model provides a kind of motor start-up operating control device, and this control device can provide the overload protection of heavy load starting for motor, thereby prevents that motor from electric fault taking place to jump.

For achieving the above object, the utility model adopts following technical scheme:

This motor start-up operating control device comprises major loop and control loop, major loop comprises A.C. contactor main contacts and the thermal relay that is connected with motor, control loop comprises the overload protection module, the overload protection module comprises automatic switch, ac contactor coil and thermal relay contact, described control loop also comprises anti-jump electric module, anti-jump electric module comprises the auxiliary relay coil, time relay coil and time relay main contacts, the auxiliary relay coil is with after time relay main contacts is connected, in parallel with time relay coil, the automatic switch with the overload protection module is connected again; Described major loop also comprises the auxiliary relay main contacts, and the auxiliary relay main contacts is in parallel with thermal relay.

Described anti-jump electric module also comprises switching branches, switching branches comprise successively the normally closed button that connects, often open button and lock-up relay coil, with the lock-up relay self holding contact of often opening the button parallel connection and the lock-up relay main contacts of connecting with time relay coil.

Described anti-jump electric module also comprises normal indicator light, connects with time relay main contacts behind normal indicator light and the auxiliary relay coils from parallel connection of coils.

Described anti-jump electric module also comprises the warning branch road in parallel with time relay coil, and the warning branch road comprises time relay auxiliary contact, auxiliary relay auxiliary contact and the alarm that connects successively.

Described auxiliary relay main contacts, lock-up relay self holding contact, lock-up relay main contacts, time relay auxiliary contact and auxiliary relay auxiliary contact are normally opened contact; Time relay main contacts is a normally-closed contact.

In technique scheme, motor start-up operating control device of the present utility model not only can carry out overload protection to motor, but also can prevent that heavy load starting from electrical phenomena taking place to jump.This control device comprises major loop and control loop; control loop comprises overload protection module and the anti-jump electric module that links to each other with the automatic switch of overload protection module; by the time relay of anti-jump electric module delay time control auxiliary relay; make the closure of the auxiliary relay main contacts in the control major loop; make the thermal relay dead electricity; thereby play the effect that prevents to jump electrical phenomena, guaranteed that not only motor normally moves, and it has also improved operating efficiency.

Description of drawings

Fig. 1 is the control loop schematic diagram of the motor start-up operating control device of prior art;

Fig. 2 is the major loop schematic diagram of the control device of prior art;

Fig. 3 is the major loop schematic diagram of motor start-up operating control device of the present utility model;

Fig. 4 is the control loop schematic diagram of control device of the present utility model;

Fig. 5 is the circuit theory diagrams of the anti-jump electric module of control device of the present utility model.

Embodiment

Further specify the technical solution of the utility model below in conjunction with drawings and Examples.

See also Fig. 3, shown in Figure 4; motor start-up operating control device of the present utility model and prior art are basic identical; equally also comprise major loop and control loop; major loop comprises the A.C. contactor main contacts KM-1 that is connected with motor D and thermal relay KT1, KT2, KT3; control loop comprises overload protection module 21, and overload protection module 21 comprises automatic switch KA, ac contactor coil KM and thermal relay contact KT-1 etc.Unlike the prior art be, described control loop also comprises an anti-jump electric module 22, this anti-jump electric module 22 comprises auxiliary relay coil ZJ1, time relay coil SJ and time relay main contacts SJ-1, auxiliary relay coil ZJ1 is with after time relay main contacts SJ-1 connects, SJ is in parallel with time relay coil, is connected with the automatic switch KA of overload protection module 21 again; And described major loop also comprises auxiliary relay main contacts ZJ1-1, ZJ1-2, and auxiliary relay main contacts ZJ1-1, ZJ1-2 are in parallel with thermal relay KT1, KT2, KT3 respectively, in order to the dead electricity that gets of control thermal relay KT1, KT2, KT3.

Please in conjunction with shown in Figure 5, above-mentioned anti-jump electric module 22 also comprises a switching branches, switching branches comprise successively the normally closed button TA that connects, often open button QA and lock-up relay coil ZJ2, with the lock-up relay self holding contact ZJ2-3 that often opens button QA parallel connection and the lock-up relay main contacts ZJ2-1, the ZJ2-2 that connect with time relay coil SJ.Normally closed button TA, anti-jump electric module 22 work stops and starting when often opening button QA and be respectively applied for heavy load starting.And this anti-jump electric module 22 also comprises normal indicator light HD, connects with time relay main contacts SJ-1 after normal indicator light HD and the auxiliary relay coil ZJ1 parallel connection.In addition, this anti-jump electric module 22 also comprises the warning branch road in parallel with time relay coil SJ, and the warning branch road comprises time relay auxiliary contact SJ-2, auxiliary relay auxiliary contact ZJ1-3 and the alarm BJ that connects successively.Need to prove at this, above-mentioned auxiliary relay main contacts ZJ1-1, ZJ1-2, lock-up relay self holding contact ZJ2-3, lock-up relay main contacts ZJ2-1, ZJ2-2, time relay auxiliary contact SJ-2 and auxiliary relay auxiliary contact ZJ1-3 are normally opened contact, time relay main contacts SJ-1 is a normally-closed contact, and normally closed button TA, often open button QA, normal indicator light HD and alarm BJ and all be arranged on the control panel, and by with the 1# among Fig. 5 and 2# terminal respectively on the N# and 161# to Fig. 3, and alarm BJ can select buzzer for use.

The operation principle that this motor D starts operating control device is as follows:

After the KA closure, motor D operate as normal, KT gets and electricly provides overload protection (same as the prior art, as not repeat them here) for motor D; When if motor D needs heavy load starting, press QA, ZJ2 gets, make ZJ2-1, ZJ2-2, ZJ2-3 is closed simultaneously, QA self-insurance and SJ must establish the beginning delay working by cable, delay time is set at 40 seconds, this moment the SJ-1 closure, ZJ1 gets, thereby make the ZJ1-1 in the major loop, ZJ1-2 is closed simultaneously, with KT1, KT2, KT3 moment the dead electricity that opens circuit, thereby guarantee that KT-1 remains closure, KM all the time electric, KM-1 is closed all the time, thereby guarantee that motor normally starts operation, avoided thermal relay KT1, KT2, KT3 is started big current affects and is moved, and finally prevents the jumping electrical phenomena, the luminous indication operate as normal of HD this moment; After time-delay 40 seconds, the SJ-1 automatic disconnection, the ZJ1 dead electricity disconnects ZJ1-1, the ZJ1-2 of major loop, thus KT1, KT2, KT3 once more electric, switch back overload operation protection to motor D.After if motor normally starts operation; ZJ1 is dead electricity not; ZJ1-3 closure then, the BJ warning of sounding, illustrate KT1, KT2, KT3 not the electric overload protection that carries out; can press TA this moment immediately; make ZJ2 cut off the power supply, ZJ2-1, ZJ2-2 disconnect, and the SJ dead electricity stops delay working; therefore can make the ZJ1 dead electricity, KT1, KT2, KT3 operate as normal.

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.

Claims

1. motor start-up operating control device; comprise major loop and control loop; major loop comprises A.C. contactor main contacts and the thermal relay that is connected with motor; control loop comprises the overload protection module; the overload protection module comprises automatic switch, ac contactor coil and thermal relay contact, it is characterized in that:

Described control loop also comprises anti-jump electric module, anti-jump electric module comprises auxiliary relay coil, time relay coil and time relay main contacts, the auxiliary relay coil is with after time relay main contacts is connected, in parallel with time relay coil, the automatic switch with the overload protection module is connected again;

Described major loop also comprises the auxiliary relay main contacts, and the auxiliary relay main contacts is in parallel with thermal relay.

2. motor start-up operating control device as claimed in claim 1 is characterized in that:

3. motor start-up operating control device as claimed in claim 2 is characterized in that:

4. motor start-up operating control device as claimed in claim 3 is characterized in that:

5. motor start-up operating control device as claimed in claim 4 is characterized in that: