CN201679703U

CN201679703U - Control device for service water pump and standby water pump

Info

Publication number: CN201679703U
Application number: CN2010201656373U
Authority: CN
Inventors: 叶荣平; 吴建卫
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-04-21
Filing date: 2010-04-21
Publication date: 2010-12-22
Anticipated expiration: 2020-04-21

Abstract

The utility model provides a control device for a service water pump and a standby water pump, which comprises a single chip microprocessor and a digital logic controller. The digital logic controller is provided with eleven switching value input ends including a manual selecting switch line, an automatic selecting switch line, a pump starting signal line, a pump stopping signal line, two motor detection lines, four manual starting and stopping lines and a fault clearing signal button line, and the digital logic controller is further provided with seven switching value output ends including three main pump motor control lines, three standby pump motor control lines and an alarming line. The control device adopts a single chip microprocessor digital logic circuit so as to be more precise in timing, thereby greatly improving performances and uniformity, avoiding star-point short circuit current caused by the fact that a KM3 and a KM2 are in electrification and pull-in simultaneously, and preventing interphase short circuit due to large electric arc. The total control device is integrated in a special casing, thereby greatly reducing secondary wiring and bringing more convenience for follow-up production and maintenance.

Description

The using and the reserved pump control unit

Technical field

The utility model relates to pump control unit.

Background technique

In the practical engineering application, the water pump the using and the reserved star triangle reduced voltage starting control cabinet of at present general low-voltage electrical complete sets of equipment manufacturer production, for the consideration to cost, secondary component generally adopts compositions such as auxiliary reclay, the time relay and hand automatic change-over.With reference to Figure of description 1, its working principle is as follows: fus FU closes, control loop gets, throw over switch SAC selects manual position, press starting button SF1, star-like starting contactor KM3 gets electric adhesive, its KM3 often opens the auxiliary contact self-locking, contactor KM2, time relay KT2 obtains electronic work simultaneously, 1# fire hydrant pump motor winding becomes wye connection to begin reduced voltage starting, after the time, relay K T2 reached the delay time of adjusting, and the KT2 normally opened contact closure of timing closing, the KT2 normally-closed contact that time-delay disconnects disconnects, contactor KM3 dead electricity disconnects, and KM3 normally closed auxiliary contact closure makes contactor KM1 obtain electronic work, 1# fire hydrant motor windings converts the trigonometric form connection to by wye connection, and so far the reduced voltage starting process finishes.At this, be equipped with switching principle automatically mutually about the using and the reserved motor and just do not narrated one by one.In long-term practical application, we find when star triangle reduced voltage starting, since contactor KM2, KM3 almost be simultaneously electric adhesive, at this moment motor windings is connected into wye connection and has produced no small asterism short circuit electric current, when wye connection changes into the trigonometric form connection, because conversion rapidly, the big electric arc of generation easily causes phase fault.In this simultaneously, the control circuit more complicated, discreteness is big, and secondary connection is loaded down with trivial details, and this gives debugging and safeguards and all bring inconvenience, and so some occasion has adopted the PLC programmable controller to control now, but its cost is higher, is difficult to extensive popularization.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of the using and the reserved pump control unit, and it is not only safer reliable but also cost is also lower.For this reason, the utility model is by the following technical solutions: it comprises the digital logic controller that is provided with monolithic microprocessor, described digital logic controller has 11 switching value input ends, wherein hand automatic selector switch 2 lines, start-stop signal 2 lines, motor detect 2 lines, manual start-stop 4 lines and fault clearance call button 1 line, described digital logic controller also has 7 switching value output terminals, wherein main pump motor is controlled 3 lines, stand by pump Electric Machine Control 3 lines and the line of reporting to the police;

Controlling 3 lines at the main pump motor of 7 switching value output terminals is connected with star-like starting contactor KM3, contactor KM2, contactor KM1 respectively, wherein, star-like starting contactor KM3 opens prior to contactor KM2, and contactor KM1 closes the back at star-like starting contactor KM3 and opens;

Stand by pump Electric Machine Control 3 lines at 7 switching value output terminals are connected with star-like starting contactor KM6, contactor KM5, contactor KM4 respectively, wherein, star-like starting contactor KM6 opens prior to contactor KM5, and contactor KM4 closes the back at star-like starting contactor KM6 and opens.

Owing to adopt the technical solution of the utility model, the utility model has been realized the water pump the using and the reserved star triangle reduced voltage starting control cabinet all functions that the auxiliary reclay described in the background technique and the time relay etc. are formed.Owing to adopted the single-chip microcomputer Digital Logical Circuits, make its timing accurate more, performance and conformity thereof all have greatly improved, avoided KM3 and KM2 simultaneously the asterism short circuit electric current of electric adhesive generation, prevented the phase fault that big electric arc causes.The The whole control device can be integrated in the special-purpose casing, secondary connection greatly reduces, this brings great convenience in the future production, maintenance, no matter monnolithic case or weight are all lightly many than former relay scheme, and its cost of production is more much lower than PLC controller again, for the using and the reserved full-voltage starting that adapts to other water pump with from required controls such as lotus root reduced voltage startings, then need not as the PLC programmable controller again to the PLC reprograming, only need simply be provided with and to meet the demands control gear.

Description of drawings

Fig. 1 is the described traditional the using and the reserved star triangle reduced voltage starting control loop circuit diagram of background technique.

Fig. 2 is a using and the reserved star triangle reduced voltage starting control loop circuit diagram provided by the utility model.

Fig. 3 is the using and the reserved water pump control main loop circuit schematic representation.

Fig. 4 is a theory diagram of the present utility model.

Fig. 5 is the utility model star triangle reduced voltage starting control flow chart:

Embodiment

With reference to accompanying drawing 2 and 3.The using and the reserved pump control unit provided by the utility model comprises the digital logic controller that is provided with monolithic microprocessor MCU, and described digital logic controller has 11 switching value input ends, is respectively:

Hand automatic selector switch 2 lines, i.e. two lines of label SF indication;

Start-stop signal 2 lines, wherein label KA1 has been the pump signaling line, label KA2 is the termination of pumping signaling line;

Manual start-stop 4 lines, wherein, label SF1 is a main pump motor manual actuation of button signaling line, and label SS1 is the manual stop button signaling line of main pump motor, label SF2 is a stand by pump motor manual starting button signal line, and label SS2 is the manual stop button signaling line of stand by pump motor;

Motor detects 2 lines, and wherein, label KM2/KM3 is that main pump motor plays the pump operation signaling line, and label KM5/KM6 plays the pump operation signaling line for the stand by pump motor;

Fault clearance call button 1 line, promptly label SBR is a fault clearance call button line.

Label GND is the input signal common wire.

Described microprocessor also has 7 switching value output terminals, is respectively:

Main pump motor is controlled 3 lines, and wherein, label KM3, KM2 are the star-like reduced voltage starting contactor coil of main pump motor drive controlling line, and label KM1 is main pump motor triangle operation contactor coil drive controlling line;

Stand by pump Electric Machine Control 3 lines, wherein, KM6, KM5 are the star-like reduced voltage starting contactor coil of stand by pump motor drive controlling line; KM4 is a stand by pump motor triangle operation contactor coil drive controlling line;

The 1 line FM that reports to the police, external fault alarm.

Main pump motor in 7 switching value output terminals is controlled 3 lines and is connected with star-like starting contactor KM3, contactor KM2, contactor KM1 respectively, wherein, by setting to monolithic microprocessor, star-like starting contactor KM3 opens 150ms prior to contactor KM2, contactor KM1 closes back time-delay 150ms at star-like starting contactor KM3 and opens, with the phase fault that prevents that big electric arc from causing;

Stand by pump Electric Machine Control 3 lines at 7 switching value output terminals are connected with star-like starting contactor KM6, contactor KM5, contactor KM4 respectively, wherein, by setting to monolithic microprocessor, make star-like starting contactor KM6 open 150ms prior to contactor KM5, to avoid producing the short circuit electric current, contactor KM4 closes the back at star-like starting contactor KM6 and opens, with the phase fault that prevents that big electric arc from causing.

FU is a fus in Fig. 2, and

drawing reference numeral

2,3,4 is respectively fault indicating lamp, work indicator light, power supply indicator.Identically with drawing reference numeral among Fig. 1 in Fig. 2 be identical components and parts and play a part identical.

Fig. 3 is the utility model and the circuit block diagram of the using and the reserved water pump control major loop that adopted of the using and the reserved pump control unit in the past: AT is for supplying power with double circuit COMM communication; QF1 and QF2 are respectively the major loop circuit breaker of main pump motor and stand by pump motor; KM1, KM2, KM3 are main pump motor star-triangle reduced voltage starting control contactors; KM4, KM5, KM6 are stand by pump motor star-triangle reduced voltage starting control contactors; KH1 is that main motor heat protective gear, KH2 are standby motor heat protective gear; M1 is that main pump motor, M2 are the stand by pump motor.

As shown in Figure 2, the digital logic controller that is provided with monolithic microprocessor MCU described in the utility model carries out logic according to the outer signal line and judges, the accurate secondary control mode (repertoire as shown in Figure 1) that regularly ideally realizes originally adding the time relay by relay, and because the ms level time-delay of having adopted Single-chip Controlling to make original time relay to realize becomes easy, as shown in Figure 4: the utility model adopts the most common AC220V civil power to introduce by stabilized power supply, is converted into DC-12V, 5V confession MCU and input, output circuit work; External control switch is introduced into core control part MCU digital logic control circuit by the input photoelectric isolating circuit, core control part MCU digital logic control circuit moves control signal according to program control flow process (as shown in Figure 5) by output relay controlling and driving external contactor, thereby realizes the operation control to motor.Simultaneously, around monolithic microprocessor MCU, can design anti-clutter circuit.

As shown in Figure 5, Fig. 5 is the utility model star triangle reduced voltage starting control flow chart.

The back MCU that powers at first carries out initialization, differentiating as required is (the star triangle step-down of which kind of control flow, from lotus root brownout operation mode) if star triangle reduced voltage starting mode (ignoring not refinement here from lotus root reduced voltage starting mode states), which kind of state then differentiates SF hand automatic selector switch is, had or not the pump signal (manually then according to manually start-stop signal operation if then declare again automatically, stop), it is all effective whether to play the pump signal in the regulation time-delay, have and then begin star-like reduced-voltage starting and differentiate run signal line (do not have and continue then to have waited for that the pump signal arrives), if then switch to the triangle running state behind the normal suitable time-delay of run signal, and declare and have or not the termination of pumping signal, there is the original state that turns back to then out of service (not have and then continue operation, and wait for the termination of pumping signal), one-period finishes to wait for the arrival of pump signal together down.

Claims

1. the using and the reserved pump control unit, it is characterized in that it comprises the digital logic controller that is provided with monolithic microprocessor, described digital logic controller has 11 switching value input ends, wherein hand automatic selector switch 2 lines, start-stop signal 2 lines, motor detect 2 lines, manual start-stop 4 lines and fault clearance call button 1 line, described digital logic controller also has 7 switching value output terminals, wherein main pump motor is controlled 3 lines, stand by pump Electric Machine Control 3 lines and the line of reporting to the police;