CN105487004A - DC contactor or relay closing time test circuit - Google Patents

Abstract

The invention discloses a DC contactor or relay closing time test circuit, which comprises a power converter, a timer, an AC contactor and a measured piece. Powering of a coil of the AC contactor is realized by connecting the coil of the AC contactor with a start button switch and a stop button switch in series and then, connecting with a 220 AC power supply; one auxiliary contact of the AC contactor is connected in parallel with the start button switch; two main contacts of the AC contactor are connected in series between the 220 AC power supply and the AC input end of the power converter; the power input end of the timer is connected with the 220 AC power supply, the negative level input end thereof is connected with a 5V direct current output negative terminal of the power converter, and a positive level input end thereof is connected with a 5V direct current output positive terminal of the power converter through a normally-closed contact of the measured piece; and the two ends of a coil of the measured piece is connected with 110 V direct current output positive and negative terminals of the power converter respectively. Synchronous powering up of the coil of the measured piece and the normally-closed contact is guaranteed, and precision test of the closing time of the DC contactor can be realized.

Description

D.C. contactor or relay-operating time test circuit

Technical field

The present invention relates to a kind of D.C. contactor or relay-operating time test circuit, belong to electrical engineering technical field.

Background technology

Adhesive actuation time in D.C. contactor or relay, namely from during the energizing quantity of input regulation to the time interval that it exports dynamic circuit connector (break) closing of contact (disconnection), be the important indicator of its quality good or not of measurement.The D.C. contactor of prior art or relay-operating time test circuit as shown in Figure 1, the short circuit duration of time switch amount input end 3 and 4 when timer T closes from three moving together contact of A.C. contactor KM, when the break contact K-2 to measured piece K disconnects only.But in fact the action of these three moving together contact can not be accomplished definitely to close simultaneously, therefore obtain input energizing quantity from the coil K-1 of tested contactor K and just can not accurately be reflected to timer T to the time interval exporting break contact K-2 disconnection.Such as, A.C. contactor KM coil obtains electric, if contact KM-3 is comparatively contact KM-1, KM-2 make delay 10ms, then after the coil K-1 of measured piece K obtains input energizing quantity, timer T also can postpone 10ms and just start timing; When the break contact K-2 of measured piece K disconnects, timer T stops timing.Time of such timer reflection just few than the trip time of reality 10ms.Vice versa.

Summary of the invention

Object of the present invention overcomes the deficiency of above-mentioned prior art exactly, provide a kind of allow measured piece coil and break contact synchronous electric, the D.C. contactor that realizes precisely test or relay-operating time test circuit.

The object of the present invention is achieved like this: a kind of D.C. contactor or relay-operating time test circuit, comprise supply convertor, timer, A.C. contactor and measured piece, it is characterized in that:

The coil of described A.C. contactor connects 220V AC power with start button switch, stop button switch after connecting, auxiliary contact and start button switch also connect, and two main contactss are serially connected between the ac input end of 220V AC power and described power supply changeover device respectively;

The power input of described timer connects 220V AC power, the negative terminal that described in its negative level input termination, the 5V direct current of supply convertor exports, the anode that the 5V direct current that positive level input end connects described supply convertor by the break contact of measured piece exports;

The positive and negative end of the 110V direct current output of power supply changeover device described in coil two termination of described measured piece.

Technical scheme of the present invention, ensure that by the coil of test specimen and break contact synchronous electric, therefore can realize the accurate test to D.C. contactor or relay-operating time.

Accompanying drawing explanation

Fig. 1 be prior art D.C. contactor or relay-operating time test circuit schematic diagram.

Fig. 2 be the embodiment of the present invention D.C. contactor or relay-operating time test circuit schematic diagram.

Embodiment

For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Referring to accompanying drawing 2, the D.C. contactor of the present embodiment or relay-operating time test circuit, comprise supply convertor U, timer T, A.C. contactor KM and measured piece K.The coil of A.C. contactor KM connects 220V AC power with start button switch S 1, stop button switch S 2 after connecting, an auxiliary contact KM-0 of A.C. contactor KM and start button switch also connect, be used for self-locking keep ac contactor coil continue electric, two main contactss KM-1, KM-2 are serially connected between the ac input end of 220V AC power and described power supply changeover device U respectively.The power input of timer T connects 220V AC power, the negative terminal that the 5V direct current that its negative level input end 2 connects supply convertor exports, the anode that the 5V direct current that positive level input end 1 meets described supply convertor U by the break contact K-2 of measured piece K exports.The positive and negative end of the 110V direct current output of power supply changeover device U described in coil K-1 two termination of measured piece K.Power protection switch Q adopts air switch, be used for power supply input and short-circuit protection.Reset button S3 is used for timer T back to zero.

Power turn-on protection switch Q, timer obtains electric display 000.000ms.Press start button S1, interchange connects contactor KM coil and obtains electric, and contact KM-0 has closed self-locking action, and the closed supply convertor U that makes of main contacts KM-1, KM-2 connects alternating current 220V power supply.Now supply convertor U synchronism output DC110V and DC5V immediately, the coil K-1 of measured piece K is made to obtain electric, the positive and negative level input 1,2 of T when break contact K-2 series connection amounts to, timer T starts timing, until break contact K-2 disconnects, the level input of timer T disconnects, and stops timing and keeps numeral, and the value that now timer T shows is exactly the pickup time of measured piece K.Press shutdown switch button S2, A.C. contactor KM coil blackout discharges, and its contact KM-0, KM-1, KM-2 disconnect, and the input of supply convertor U disconnects, and output is zero, and measured piece K has a power failure release.Press reset button S3, timer T zeros data, for test next time is prepared.

Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (1)

1. D.C. contactor or relay-operating time a test circuit, comprise supply convertor, timer, A.C. contactor and measured piece, it is characterized in that:

The coil of described A.C. contactor connects 220V AC power with start button switch, stop button switch after connecting, and A.C. contactor auxiliary contact and start button switch connect, and two of A.C. contactor main contactss are serially connected between the ac input end of 220V AC power and described power supply changeover device respectively;

The power input of described timer connects 220V AC power, the negative terminal that described in its negative level input termination, the 5V direct current of supply convertor exports, the anode that the 5V direct current that positive level input end connects described supply convertor by the break contact of measured piece exports;

The positive and negative terminal of the 110V direct current output of power supply changeover device described in coil two termination of described measured piece.