CN102635543A - Non-disturbance switching water pump control method - Google Patents
Non-disturbance switching water pump control method Download PDFInfo
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- CN102635543A CN102635543A CN2012101081793A CN201210108179A CN102635543A CN 102635543 A CN102635543 A CN 102635543A CN 2012101081793 A CN2012101081793 A CN 2012101081793A CN 201210108179 A CN201210108179 A CN 201210108179A CN 102635543 A CN102635543 A CN 102635543A
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Abstract
The invention relates to a non-disturbance switching water pump control method comprising the following steps of: selecting different control manners of a water pump motor according to operation requirements of a water pump system; using a long-distance control manner of the water pump motor when a water pump normally works, so that a PLC (Programmable Logic Controller) performs monitoring and on-off control on a motor state automatically or according to set technological parameters; when the water pump has a fault and needs to maintain or carry out field emergency enablement, selecting an in-position control manner of the water pump motor which is operated to a field operation box; and realizing non-disturbance switching between the two modes when the motor continuously works through delay relays which are respectively arranged at each mode state in a mutual switching process. In a condition of not changing any technical requirement of the water pump system, the non-disturbance switching water pump control method provided by the invention can be used for not only realizing a control manner of mutually switching between a concentrated manner and a local manner of the water pump motor without being switched off, but also carrying out on-off operation on the field operation box and an HMI (Human-Machine Interface), so that the security reliability and operation convenience of the water pump system can be improved.
Description
Technical field
The present invention relates to a kind of water pump method for handover control, can be widely used in the water treatment system that every profession and trade needs continuous firing.
Background technique
To the demanding industry of water treatment system work persistency; In some system like the continuous annealing of iron and steel enterprise, zinc-plated, hot rolling, blast furnace and converter; All need circulating water to come cooling equipment could guarantee the normal operation of equipment, stop to cause great property loss in case supply water.So, guarantee that the reliability of water treatment system pump working and persistency are the preconditions of the normal operation of whole system.
At present, our water system all is to adopt the PLC system to control.Our water pump may cause the interruption that moves because of a variety of causes at scene, such as outage, fault or the shutdown of PLC but usually; The interruption of communication network; Maintenance and the switching etc. of operator scheme during emergency.Will the proper functioning of water treatment system be made a big impact thus, so in the present method, system reliability, persistency and Security all have much room for improvement.
Summary of the invention
The technical problem that will solve of the present invention is: overcome above-mentioned technological deficiency; Provide a kind of unperturbed to switch the water pump controlling method;, control system can guarantee the water pump system continuous service when switching; Fully improving the reliability and the Security of water pump system, is that the maintenance of debugging and pump group facilitates simultaneously, increases the working life of water pump system.
For solving technique scheme, the technological scheme that the present invention adopts is:
Unperturbed switches the water pump control method; It is characterized in that: utilize unperturbed to switch control system of water pump; Different pump motor control modes is selected in requirement according to the water pump system operation; Employing Long-distance Control pump motor mode during the water pump operate as normal, PLC controls the supervision and the start and stop of motor status automatically or according to setting technological parameter or completion; When the water pump fault, when needing maintenance or on-the-spot emergency start, be chosen in the pump motor of the control on the spot mode of execute-in-place case operation; Realize that by the time-delay relay that is provided with respectively under each mode state the non-stop-machine unperturbed of motor switches under two patterns when switching each other; Described unperturbed switches the control loop that control system of water pump includes the main circuit that is connected with controlled pump motor and controls said main circuit; Wherein, Described control loop inserts power supply by breaker; The operator scheme selection module that includes operation and the malfunction indicating module that whether normally moves by start and stop control module, judgement and the indication motor controlling the startup of motor with long-range dual mode on the spot and stop and can carry out double mode selection; Described operator scheme selects module to be: the dibit selector switch is set on the control loop major loop; Control loop and Long-distance Control loop are in parallel on the spot behind the dibit selector switch, and on corresponding each status circuit a time-delay relay are set all behind the dibit selector switch; Each time-delay relay all carry one prolong during closed immediately and outage when electric break off behind the setting-up time often drive auxiliary contact.
By technique scheme, need to move water pump when remote mode switches to regard to ground mode, the dibit selector switch is switched to contact on the spot from long-range contact; Be the dibit selector switch when long-range contacting switches on the spot contacting; The time delay relay coil of the manual control circuit that status circuit is corresponding on the spot immediately electric, corresponding auxiliary contact are closed immediately, the time delay relay coil blackout on the while remote status control circuit; But the time delay relay auxiliary contact after the outage still temporarily remain closed; This moment on the spot, time delay relay normally opened contact, contactor normally opened contact on the remote status control circuit be in simultaneously electric closed state, after remote status control circuit delay time arrived, the time delay relay normally opened contact broke off; Then the remote status circuit breaks off; This moment, status circuit still kept connecting on the spot, and motor and water pump remain running state in the then whole handoff procedure, had realized switching to the no disturbance switching with regard to ground mode from remote mode; To move motor and pump from mode switching is to remote mode on the spot like needs, this moment, the state of dibit selector switch was the Work in Place pattern, and promptly contacting on the spot need switch to long-range contacting; Switch on the remote status control circuit of back the time delay relay coil immediately; Its auxiliary point is closed immediately; And the time delay relay coil blackout of the manual control circuit that status circuit is corresponding on the spot, but the time delay relay auxiliary contact after the outage still temporarily remain closed, this moment on the spot, time delay relay normally opened contact, contactor normally opened contact on the remote status control circuit be in simultaneously electric closed state; After the state control circuit delay time arrives on the spot; The time delay relay normally opened contact breaks off, and then status circuit breaks off on the spot, and this moment, the remote status circuit still kept connecting; Motor and water pump remain running state in the then whole handoff procedure, have realized that the no disturbance from mode switching on the spot to remote mode is switched.
By technique scheme, described start and stop control module is: the normally-closed contact of series contactor, main disconnector normally opened contact and three-phase thermorelay again after manual start and stop circuit that control loop is corresponding on the spot and the parallel connection of long-range start and stop circuit; Manually in the start and stop circuit, control the time delay relay normally-closed contact and the normally opened contact of start button of the stop button on the operated in series case successively on the spot for one, contactor normally opened contact in one of the stop button contact parallel connection simultaneously; In the long-range start and stop circuit, a telecontrol time delay relay is connected successively and is exported the normally opened contact of the starting relay of controlling and the normally-closed contact of slew relay by PLC, and the contactor normally opened contact is gone up in one of the normally-closed contact of slew relay parallel connection simultaneously.
By technique scheme, be connected in series main disconnector and thermorelay successively after the indicating fault loop of operation and fault state indicating module and the operation/stop to indicate the loop parallel connection; The normally opened contact of the coil series connection main disconnector of the auxiliary reclay in indicating fault loop; Move/stop the normally opened contact of the auxiliary reclay two ends difference series contactor of indicating the loop and the normally opened contact of main disconnector; Operation and fault state indicating module also comprise the pilot lamp loop that shows various running statees, and each pilot lamp loop is in series by an auxiliary reclay and tutorial light; The auxiliary contact of often opening of the auxiliary reclay in indicating fault loop link to each other with the fault indicating lamp loop; Move/stop the auxiliary reclay of indicating the loop often open auxiliary contact respectively with stop pilot lamp loop and link to each other with the run indicator loop.
By technique scheme, the input and output point that system also is provided with under remote status through the PLC system is kept watch on the man-machine interface with start and stop control to motor status.
By technique scheme, described state on the spot be set to artificially to control motor with regard to ground mode, remote status is set to the remote mode of artificial control and PLC automatic control motor.
By technique scheme, the three-phase electrical source of power in the main circuit is drawn on the circuit breaker of motor control center, and through being connected to motor behind contactor, the thermorelay.
By technique scheme; Each relay, contactor, circuit breaker all are arranged on motor control center; Selector switch, each button, tutorial light are arranged in the execute-in-place case, and the execute-in-place case is linked into motor control center, are connected alternately through control signal between motor control center and the PLC system.
With respect to existing technology; The present invention is under the situation that does not change any manufacturing equipment of water pump system; The only upgrading through electrical equipment; Realize pump motor long-range and switch and non-stop-machine control mode mutually on the spot, and carried out start stop operation on operating box and the HMI (man-machine interface) at the scene, improved the safety reliability and the property convenient for control of water pump system.
In addition; Owing to adopt the start and stop of dual output time delay relay control of pump motor; The dual-delay relay be in short-term electric duty, relay start accomplish after then outage automatically immediately, prolonged working life of relay with respect to single relay system of long-time adhesive; The operation that can shut down at PLC simultaneously, still keep water pump under the situation such as network interruption has improved the security and stability of factory's running.
At last; That this controlling method can be implemented in is long-range/continuous service of operation motor and water pump when switching on the spot, this function under the accident emergency for the persistency of water pump operation provides assurance, simultaneously for debugging and the pump group is overhauled and provided convenience; Avoided because of long-range/switch the water pump frequent start-stop that causes on the spot; Do not shut down directly after the realization plant maintenance and put into operation, reduce start-stop time, increase the working life of equipment electrical network impact and equipment.
Description of drawings
Fig. 1 is: the control loop circuit diagram of the control system that the present invention adopted.
Fig. 2 is: the main loop circuit figure of the control system that the present invention adopted.
Fig. 3 is: the control system PLC input signal allocation plan that the present invention adopted.
Fig. 4 is: the control system PLC output signal configuration figure that the present invention adopted.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further, but does not limit the present invention.
The inventive method is divided into telecontrol and control mode on the spot; The Different control mode is selected in requirement according to pump, and pump just often adopts the telecontrol mode generally speaking, and PLC is according to technological requirement; Automatically confirm the quantity of primer pump; When failure of pump, when needing maintenance or on-the-spot emergency start, pump is selected control mode on the spot, realizes that through time delay relay unperturbed switches when switching each other.
Electric control loop is the hardware environment of whole system.As attaching illustrated in figures 1 and 2ly, its control loop comprises motor M, MCC (Motor Control Center, motor control center) control cabinet, PLC (programmable logic controller (PLC)) cabinet, HMI (man-machine interface), execute-in-place case.Wherein selector switch, button, tutorial light etc. are installed in the execute-in-place case, are convenient at the scene motor operated and kept watch on.Selector switch can on the spot, remote operation switches; When failure of pump, when needing maintenance or on-the-spot emergency start; Selector switch is threaded to local operation, and this moment, pump was in the manual on the spot state of a control of execute-in-place case operation fully, not influenced by any of PLC equipment and program.When selector switch is threaded to remote operation, pump can carry out manual start and stop on HMI, also can on HMI, select automatic mode, and start-stop automatically when at the enterprising line operate of HMI, is accomplished supervision and start and stop control to motor status through the input and output point of PLC.Electrical controls such as circuit breaker, contactor, thermorelay, auxiliary reclay and time delay relay and protecting component are installed in the MCC control cabinet, and state signal is sent among the PLC, and remote control signal is seen off by PLC.
Each control unit and protecting component effect and annexation are in the accompanying drawing 1～4: Q11 is that major loop circuit breaker, Q12 are the control loop circuit breaker, is responsible for the break-make of control power supply; K11 is a contactor, when closed, and pump operation, during disconnection, pump stops; F11 is a thermorelay, the motor overheating protection; S11 is a selector switch; Be control mode on the spot when selecting 1-2 to connect; Be the telecontrol mode by PLC output starting relay K31 and slew relay K32 control when selecting 3-4 to connect this moment, and this moment is by execute-in-place case start button S12 and stop button S13 control; K12, K13 are auxiliary reclay, and the fault of circuit breaker and thermorelay is sent to the operating box tutorial light to the K12 auxiliary point and PLC keeps watch on, and the K13 auxiliary point will move/and stop signal is delivered to the operating box tutorial light and PLC keeps watch on; K14, K15 are time delay relay, respectively carry a time-delay and break off auxiliary point, when relay gets when electric; Corresponding often to drive auxiliary contact closed immediately, when outage, breaks off behind the contact time-delay certain hour; Guaranteed like this in the process of switching; Relay is dead electricity, but its corresponding auxiliary contact or closure, equipment can keep former running state certain hour; H21, H22, H23 are signaling lamp on the operating box, respectively reflected pump move, stop, fault state.
Shown in Figure 1 is control loop of the present invention; Two line traffic control power supply (Ac 220V; Phase line 1L01, zero line 1L02) be connected to the MCC control cabinet through circuit breaker Q 12, comprise in the MCC control cabinet operation control loop, indicating fault loop, operation indication loop, on the spot/the Remote Selection loop.The Q12 circuit breaker is housed between control loop and the incoming power short circuit and overload protection are carried out in the The whole control loop.Control loop mainly is divided into 3 parts.
(1) start and stop control section.By controlling the startup of motor with long-range dual mode on the spot and stopping.The normally closed point of the normally opened contact difference serial operation case stop button S13 of time-delay disconnection relay-K14 and the normal battle of start button S12, the normal battle of contactor K11 is as self-insurance in the while S12 parallel connection; The normally opened contact that relay-K15 is broken off in time-delay connect respectively slew relay (PLC output) K32 normally closed point and starting relay (PLC output) K31 normal battle, the normal battle of contactor K11 is as self-insurance in the while K31 parallel connection.The coil of two loop series contactor K11, the normally opened contact of main disconnector Q11, the normally-closed contact of thermorelay F11 then.
(2) operation and fault state indicating section.The normally opened contact of the coil series connection main disconnector Q11 of auxiliary reclay K12, the normally-closed contact of thermorelay F11, as the judgement of fault state, the auxiliary contact of often opening of K12 are delivered to operating box tutorial light H23 indicating fault status.The normally opened contact of the coil series contactor K11 of auxiliary reclay K13, the normally opened contact of main disconnector Q11, the normally-closed contact of thermorelay F11; Judgement as running state; The auxiliary contact of often opening of K13 are delivered to operating box tutorial light H21 indication running state, and the normally closed auxiliary contact of K13 is delivered to operating box tutorial light H22 indication halted state.
(3) operator scheme is selected part.11, two of switch S on the operating box are selected connect respectively on the position time delay relay K14 and K15, as the selection of control or telecontrol on the spot.As need process pump be switched to regard to ground mode from remote mode; Then dibit selector switch S11 is switched on the spot from long-range, promptly S11 connects from 3-4 and switches to 1-2 and connect, and time delay relay K14 coil immediately; It is corresponding that often to drive auxiliary contact closed immediately; Simultaneously time delay relay K15 coil blackout still temporarily remains closed but the K15 after the outage often drives auxiliary contact, this moment K14 and K15 normally opened contact, contactor K11 normally opened contact be in simultaneously electric closed state.After the K15 delay time arrived, its normally opened contact broke off, but this moment, K14 still kept connection, and motor and water pump remain running state in the then whole handoff procedure, had realized switching to the no disturbance switching with regard to ground mode from remote mode.
As need be with process pump from mode switching on the spot to remote mode; Then that dibit selector switch S11 is long-range from switching on the spot; Time delay relay K15 coil immediately electric, corresponding often to drive auxiliary contact closed immediately, simultaneously time delay relay K14 coil blackout; But the auxiliary normally opened contact of the K14 after the outage still temporarily remains closed, this moment K14 and K15 normally opened contact, contactor K11 normally opened contact be in simultaneously electric closed state.After the K14 delay time arrived, its normally opened contact broke off, but this moment, K15 still kept connection, and motor and water pump remain running state in the then whole handoff procedure, had realized switching to the no disturbance switching with regard to ground mode from remote mode.
Shown in Figure 2 is main circuit of the present invention loop, and three phase line 1L1 of three-phase electrical source of power, 1L2,1L3 are connected to contactor K11 after through circuit breaker Q 11 and often open main contact, meet three-phase thermorelay F11 down and to the main circuit loop thermal overload protection are provided.
Shown in Figure 3 is PLC input signal allocation plan of the present invention; Q11 main disconnector state is often driven auxiliary contact, F11 thermorelay state and is often opened that auxiliary contact often left by auxiliary contact, K11 running state, the K15 telecontrol is often driven auxiliary contact and sent into the PLC load module respectively, supplies the centralized control of PLC and programming to use.The auxiliary contact of often opening of Q12 connect L+ and each passage, when Q12 breaks off, then cut off all signals.
Shown in Figure 4 is PLC output signal configuration figure of the present invention, the auxiliary reclay that K31 starts for control, the auxiliary reclay that K32 stops for control.The auxiliary contact of often opening of the normally closed auxiliary contact of K32 and K31 all are connected in " remote activation/stop " loop of Fig. 1, stop as the startup of control of pump under the remote status.
Above disclosedly be merely preferred embodiment of the present invention; Certainly can not limit the present invention's interest field with this; Therefore the equivalence of doing according to claim of the present invention changes, and still belongs to protection scope of the present invention like change and the improvement that process parameter or device are made.
Claims (9)
1. unperturbed switches the water pump control method; It is characterized in that: utilize unperturbed to switch control system of water pump; Different pump motor control modes is selected in requirement according to the water pump system operation; Employing Long-distance Control pump motor mode during the water pump operate as normal, PLC controls the supervision and the start and stop of motor status automatically or according to setting technological parameter or completion; When the water pump fault, when needing maintenance or on-the-spot emergency start, be chosen in the pump motor of the control on the spot mode of execute-in-place case operation; Realize that by the time-delay relay that is provided with respectively under each mode state the non-stop-machine unperturbed of motor switches under two patterns when switching each other; Described unperturbed switches the control loop that control system of water pump includes the main circuit that is connected with controlled pump motor and controls said main circuit; Wherein, Described control loop inserts power supply by breaker; The operator scheme selection module that includes operation and the malfunction indicating module that whether normally moves by start and stop control module, judgement and the indication motor controlling the startup of motor with long-range dual mode on the spot and stop and can carry out double mode selection; Described operator scheme selects module to be: the dibit selector switch is set on the control loop major loop; Control loop and Long-distance Control loop are in parallel on the spot behind the dibit selector switch, and on corresponding each status circuit a time-delay relay are set all behind the dibit selector switch; Each time-delay relay all carry one prolong during closed immediately and outage when electric break off behind the setting-up time often drive auxiliary contact.
2. method according to claim 1; It is characterized in that: needs will move water pump when remote mode switches to regard to ground mode; The dibit selector switch is switched to contact on the spot from long-range contact, and promptly the dibit selector switch is when long-range contacting switches on the spot contacting, and the time delay relay coil of the manual control circuit that status circuit is corresponding on the spot immediately; Corresponding auxiliary contact are closed immediately; The time delay relay coil blackout on the remote status control circuit simultaneously, but the time delay relay auxiliary contact after the outage still temporarily remain closed, this moment on the spot, time delay relay normally opened contact, contactor normally opened contact on the remote status control circuit be in simultaneously electric closed state; After remote status control circuit delay time arrives; The time delay relay normally opened contact breaks off, and then the remote status circuit breaks off, and this moment, status circuit still kept connecting on the spot; Motor and water pump remain running state in the then whole handoff procedure, have realized switching to the no disturbance switching with regard to ground mode from remote mode; To move motor and pump from mode switching is to remote mode on the spot like needs, this moment, the state of dibit selector switch was the Work in Place pattern, and promptly contacting on the spot need switch to long-range contacting; Switch on the remote status control circuit of back the time delay relay coil immediately; Its auxiliary point is closed immediately; And the time delay relay coil blackout of the manual control circuit that status circuit is corresponding on the spot, but the time delay relay auxiliary contact after the outage still temporarily remain closed, this moment on the spot, time delay relay normally opened contact, contactor normally opened contact on the remote status control circuit be in simultaneously electric closed state; After the state control circuit delay time arrives on the spot; The time delay relay normally opened contact breaks off, and then status circuit breaks off on the spot, and this moment, the remote status circuit still kept connecting; Motor and water pump remain running state in the then whole handoff procedure, have realized that the no disturbance from mode switching on the spot to remote mode is switched.
3. method according to claim 1 and 2 is characterized in that: described start and stop control module is: the normally-closed contact of series contactor, main disconnector normally opened contact and three-phase thermorelay again after manual start and stop circuit that control loop is corresponding on the spot and the parallel connection of long-range start and stop circuit; Manually in the start and stop circuit, control the time delay relay normally-closed contact and the normally opened contact of start button of the stop button on the operated in series case successively on the spot for one, contactor normally opened contact in one of the stop button contact parallel connection simultaneously; In the long-range start and stop circuit, a telecontrol time delay relay is connected successively and is exported the normally opened contact of the starting relay of controlling and the normally-closed contact of slew relay by PLC, and the contactor normally opened contact is gone up in one of the normally-closed contact of slew relay parallel connection simultaneously.
4. method according to claim 3 is characterized in that: be connected in series main disconnector and thermorelay successively after the operation and the indicating fault loop of fault state indicating module and the operation/stop to indicate the loop parallel connection; The normally opened contact of the coil series connection main disconnector of the auxiliary reclay in indicating fault loop; Move/stop the normally opened contact of the auxiliary reclay two ends difference series contactor of indicating the loop and the normally opened contact of main disconnector; Operation and fault state indicating module also comprise the pilot lamp loop that shows various running statees, and each pilot lamp loop is in series by an auxiliary reclay and tutorial light; The auxiliary contact of often opening of the auxiliary reclay in indicating fault loop link to each other with the fault indicating lamp loop; Move/stop the auxiliary reclay of indicating the loop often open auxiliary contact respectively with stop pilot lamp loop and link to each other with the run indicator loop.
5. according to claim 1 or 2 or 4 described methods, it is characterized in that: operation and fault state indicating module also comprise the pilot lamp loop that shows various running statees, and each pilot lamp loop is in series by an auxiliary reclay and tutorial light; The auxiliary contact of often opening of the auxiliary reclay in indicating fault loop link to each other with the fault indicating lamp loop; Move/stop the auxiliary reclay of indicating the loop often open auxiliary contact respectively with stop pilot lamp loop and link to each other with the run indicator loop.
6. method according to claim 5 is characterized in that: system also is provided with is keeping watch on the man-machine interface of controlling with start and stop through the input and output point of PLC system under the state on the spot to motor status.
7. according to claim 1 or 2 or 4 or 6 described methods, it is characterized in that: described state on the spot be set to artificially to control motor with regard to ground mode, remote status is set to the remote mode of artificial control and PLC automatic control motor.
8. method according to claim 7 is characterized in that: the three-phase electrical source of power in the main circuit is drawn on the circuit breaker of motor control center, and through being connected to motor behind contactor, the thermorelay.
9. according to claim 1 or 2 or 4 or 6 described methods; It is characterized in that: each relay, contactor, circuit breaker all are arranged on motor control center; Selector switch, each button, tutorial light are arranged in the execute-in-place case; The execute-in-place case is linked into motor control center, is connected alternately through control signal between motor control center and the PLC system.
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