A kind of raw water service pump control gear
Technical field
The present invention relates to a kind of hand automatic switching control equipment, be specifically related to a kind of raw water service pump control gear.
Background technique
Pumping station evaporative cooling water raw water service pump has adopted Siemens S120 Series Frequency Converter when design, and carry out communication by the Profibus agreement between the PLC, but in water pump control, can only carry out the water pump on off control at the WinCC picture, can't carry out on off control to water pump on the spot.Once normal start and stop water pump when the abnormal conditions such as communicating interrupt occurring, the simultaneously also suddenly termination of pumping of water pump of normal operation causes great potential safety hazard when steel-making is blown.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, and a kind of on-site manual control raw water service pump is provided, and the continuous operation of assure feed water pump reduces the raw water service pump control gear of potential safety hazard.
In order to solve above technical problem, the invention provides a kind of raw water service pump control gear, comprise manual contactor KM2, automatic contactor KM1 and throw over switch SA1, described manual contactor and described automatic contactor are connected to form automatic control circuit and manual control circuit by throw over switch, wherein, automatic control circuit comprises manual contactor KM2, automatic contactor KM1, manual stop button SB1 and manual actuation of button SB2, described manual contactor KM2 is with after described manual actuation of button SB2 is in parallel, with described automatic contactor KM1, manually stop button and throw over switch SA1 series connection; Described manual control circuit comprises automatic contactor KM1 and the manual contactor KM2 that connects with throw over switch SA1.
The technological scheme that the present invention further limits is: described automatic control circuit also comprises the interlock protection contactor KM3 that connects with automatic contactor KM1.
Further, described automatic control circuit also comprises the fan operation control circuit of connecting with automatic contactor KM1, described fan operation control circuit comprises manual contactor KM2, thermorelay FR and fan operation contactor KM4, and is in parallel with fan operation contactor KM4 after described manual contactor KM2 connects with described thermorelay FR.
Further, described manual control circuit also comprises the interlock protection contactor KM3 in parallel with described automatic contactor KM1.
Further, described device also comprises the operation indicating circuit in parallel with described automatic control circuit and manual control circuit and stops indicating circuit, described operation indicating circuit comprises manual contactor KM2 and the manual run indicator HR2 of mutual series connection, and the described indicating circuit that stops to comprise the manual contactor KM2 of mutual series connection and manually stops tutorial light HR1.
Further, described device also comprises the failure indicating circuit in parallel with described automatic control circuit and manual control circuit, and described failure indicating circuit comprises thermorelay FR and the fault indicating lamp HR3 of mutual series connection.
The invention has the beneficial effects as follows: a kind of raw water service pump control gear disclosed by the invention, in control cabinet, increase throw over switch, contactor, button and tutorial light, the realization hand automaticallyes switch, normal start and stop water pump when having avoided because of abnormal conditions such as communicating interrupt, guaranteed the normal production of steel-making, and simple in structure, easy to assembly, applicability is strong.
Description of drawings
Fig. 1 is the circuit diagram of a kind of raw water service pump control gear disclosed by the invention;
Fig. 2 is the application circuit of a kind of raw water service pump control gear disclosed by the invention.
Embodiment
Embodiment 1
A kind of raw water service pump control gear that present embodiment provides, its circuit diagram as shown in Figure 1, comprise manual contactor KM2, automatic contactor KM1 and throw over switch SA1, described manual contactor and described automatic contactor are connected to form automatic control circuit and manual control circuit by throw over switch.
Automatic control circuit comprises manual contactor KM2, automatic contactor KM1, manual stop button SB1 and manual actuation of button SB2, described manual contactor KM2 is with after described manual actuation of button SB2 is in parallel, with described automatic contactor KM1, manually stop button and throw over switch SA1 connect.Described automatic control circuit also comprises the interlock protection contactor KM3 that connects with automatic contactor KM1.Described automatic control circuit also comprises the fan operation control circuit of connecting with automatic contactor KM1, described fan operation control circuit comprises manual contactor KM2, thermorelay FR and fan operation contactor KM4, and is in parallel with fan operation contactor KM4 after described manual contactor KM2 connects with described thermorelay FR.
Described manual control circuit comprises automatic contactor KM1 and the manual contactor KM2 that connects with throw over switch SA1.Described manual control circuit also comprises the interlock protection contactor KM3 in parallel with described automatic contactor KM1.
In addition, described device also comprises the operation indicating circuit in parallel with described automatic control circuit and manual control circuit, stops indicating circuit and failure indicating circuit.Described operation indicating circuit comprises manual contactor KM2 and the manual run indicator HR2 of mutual series connection.The described indicating circuit that stops to comprise the manual contactor KM2 of mutual series connection and manually stops tutorial light HR1.Described failure indicating circuit comprises thermorelay FR and the fault indicating lamp HR3 of mutual series connection.
A kind of raw water service pump control gear of the present invention is when using, circuit diagram as shown in Figure 2, throw over switch is beaten at automatic running position under normal circumstances, by the start and stop of PLC control devaporizer raw water service pump, when PLC provides actuating signal, KM1, KM3 adhesive contactor get electric adhesive, and raw water service pump is by the frequency variator converting operation; When communication outage or other faults can't the automatic start-stop water pumps; throw over switch is beaten in manual position, pressed SB2, KM2 gets electric self-locking; the water pump power frequency operation, simultaneously KM3 can't get electric adhesive and plays and prevent the counter protective action of sending electricity of frequency variator because the normally closed point of KM2 adhesive disconnects.
In addition to the implementation, the present invention can also have other mode of executions.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.