CN211266803U - Mining explosion-proof multi-loop vacuum electromagnetic starter - Google Patents

Abstract

The utility model relates to an electromagnetic starter. The mining flame-proof type multi-loop vacuum electromagnetic starter comprises an isolating switch GLHK, a transformer, a centralized control module JKMK, a display screen XSP, four relay protection modules and four vacuum alternating current contactors, wherein an external three-phase alternating current power supply is connected with an input end of the isolating switch, output ends of the isolating switch are connected with input ends of the four vacuum alternating current contactors and an input end of the transformer, a control end of each vacuum alternating current contactor is correspondingly connected with one relay protection module, an output end of each vacuum alternating current contactor is an external three-phase alternating current power supply output end, and the centralized control module JKMK is connected with each relay protection module through RS 485. The utility model discloses when the fault handling of going out all the way alone, but the independent processing, whole process does not influence other way relay protection module and normally works.

Description

Mining explosion-proof multi-loop vacuum electromagnetic starter

Technical Field

The utility model relates to an electromagnetic starter.

Background

An electromagnetic starter (magnetic starter) is a starting device used on a CCS motor with the standard of more than 0.5 KW. The motor is used for remotely controlling the starting, stopping and reversing of the motor, and is also used for over-under-voltage, leakage protection and overload protection.

The electromagnetic starter is composed of a steel stamping shell, a steel bottom plate, a vacuum alternating current contactor, a centralized control module, a relay protection module and corresponding wiring, and a start-stop button switch is matched and connected with a manual control signal cable correctly when the electromagnetic starter is used. When the start button is pressed, the coil of the vacuum AC contactor built in the magnetic starter is electrified, the armature iron drives the contact group to be closed, the power supply of an electric appliance (generally a motor) is switched on, and meanwhile, the vacuum AC contactor is self-locked through the auxiliary contact. When the stop button is pressed, the coil of the internal alternating current contactor loses power, the contact is disconnected, and the power supply of the electric appliance is cut off.

According to different control requirements, the electromagnetic starter can be flexibly wired, so that the functions of inching, phase changing and the like can be realized. The relay protection module is used for detecting and corresponding operations of starting and stopping of the vacuum alternating current contactor connected with the relay protection module, and short circuit, open circuit, overcurrent and electric leakage of a working circuit. The module setting current should meet the motor power needs.

The explosion-proof multi-loop vacuum electromagnetic starter for mine is used in mine containing explosive dangerous gas (methane) and coal dust, controls and protects the start and stop of three-phase squirrel-cage motor or double-winding squirrel-cage asynchronous motor in AC 50HZ and voltage 1140(660V) circuit, and can conveniently commutate when stopping. When the equipment has faults such as overload, short circuit and the like, the power supply can be automatically cut off, fault signals can be displayed and memorized, the starter has the functions of leakage locking protection, no-load test and leakage locking test before closing, and the state parameters of each branch can be displayed during operation.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: how to use the microprocessor and the RS485 bus.

The centralized control module and the relay protection modules form a multi-processor working system, the operation control and the working state display of the four-loop vacuum electromagnetic starter are completed in a coordinated mode, when output faults of overcurrent, electric leakage and phase failure of one path of relay protection module occur, the output faults are directly displayed on a display screen, the reset button is used for directly resetting the path of relay, when the path of fault is successfully cleared, the path of relay protection module can recover the operation, and the whole process does not affect the normal work of other paths of relay protection modules.

The utility model adopts the technical proposal that: the mining flame-proof type multi-loop vacuum electromagnetic starter comprises an isolating switch GLHK, a transformer, a centralized control module JKMK, a display screen XSP, four relay protection modules and four vacuum alternating current contactors, wherein an external three-phase alternating current power supply is connected with an input end of the isolating switch, output ends of the isolating switch are connected with input ends of the four vacuum alternating current contactors and an input end of the transformer, a control end of each vacuum alternating current contactor is correspondingly connected with one relay protection module, an output end of each vacuum alternating current contactor is an external three-phase alternating current power supply output end, and the centralized control module JKMK is connected with each relay protection module through RS 485.

Each relay protection module comprises a cpu control module circuit taking an IAP15F2K61S2-SKDIP28 chip as a core, a Connector D Connector25 plug and a start/stop feedback circuit, a relay control module circuit, a current and leakage current conversion module circuit, an overcurrent and leakage emergency stop control circuit, a working state setting module circuit and a relay protection module RS485 communication interface circuit, wherein the Connector D Connector25 plug and the start/stop feedback circuit, the relay control module circuit, the current and leakage current conversion module circuit, the overcurrent and leakage emergency stop control circuit, the working state setting module circuit and the relay protection module RS485 communication interface circuit are all connected with the cpu control module circuit taking the IAP15F2K61S2-SKDIP28 chip as the core, and the Connector D Connector25 plug and the start/stop feedback circuit are connected with the current and leakage current conversion module circuit.

The JKMK comprises a three-phase voltage phase sequence and open phase detection circuit, a working voltage sampling input module circuit, a centralized control module state setting circuit, a CPU control module circuit taking a LAP15W4K60S4-PDIP40 chip as a core, a centralized control module RS485 communication interface circuit, a centralized control module download interface circuit, a display screen interface connecting circuit and an electric leakage test output circuit, wherein the three-phase voltage phase sequence and open phase detection circuit, the working voltage sampling input module circuit, the centralized control module state setting circuit, the centralized control module RS485 communication interface circuit, the centralized control module download interface circuit, the display screen interface connecting circuit and the electric leakage test output circuit are connected with the CPU control module circuit taking the LAP15W4K60S4-PDIP40 chip as the core.

The utility model has the advantages that: the isolating switch realizes the electrical isolation of the input power supply and the internal parts of the equipment, and ensures the safe operation and use of the equipment. The four vacuum alternating current contactors realize the connection and disconnection of the four-way three-phase power supply. The four relay protection modules respectively realize the functions of on-off control, overvoltage and undervoltage, overload protection, short-circuit protection, leakage protection and the like of the four vacuum alternating-current contactors, and four paths of output can be independently controlled to be disconnected. The centralized control of the four relay protection modules is realized through the RS485 bus centralized control module, and the working state of the equipment is sent to the display screen unit for display. The display screen displays the main technical parameters of the equipment and the working state of each channel.

Drawings

FIG. 1 is a schematic diagram of the overall circuit connection of the present invention; wherein, T-1 represents a first transformer, T-2 represents a second transformer, DY represents a conversion power supply, JKMK represents a centralized control module, JDBH-1, JDBH-2, JDBH-3 and JDBH-4 represent relay protection modules of 1 st, 2 nd, 3 th and 4 th, RC represents resistance-capacitance, GLHX represents an isolating switch, XSP represents a display, and KM1, KM2KM3 and KM4 represent relays of 1 st, 2 nd, 3 th and 4 th;

FIG. 2 is a circuit diagram of a cpu control module with an IAP15F2K61S2-SKDIP28 chip as a core in a relay protection module;

FIG. 3 is a diagram of a Connector D Connector25 plug and start/stop feedback circuit;

FIG. 4 is a relay control module circuit diagram;

FIG. 5 is a circuit diagram of a current to leakage current conversion module;

FIG. 6 is a circuit diagram of an overcurrent and leakage emergency stop control circuit;

FIG. 7 is a circuit diagram of an operating condition setting module;

fig. 8 is a circuit diagram of a relay protection module download interface;

fig. 9 is a circuit diagram of a relay protection module RS485 communication interface;

FIG. 10 is a circuit diagram of three-phase voltage phase sequence and open phase detection;

FIG. 11 is a circuit diagram of an operating voltage sampling input module;

FIG. 12 is a circuit diagram of a centralized control module state setting;

FIG. 13 is a circuit diagram of a CPU control module with LAP15W4K60S4-PDIP40 chip as core;

FIG. 14 is a circuit diagram of a RS485 communication interface of the centralized control module;

FIG. 15 is a circuit diagram of a central control module download interface;

FIG. 16 is a circuit diagram of a display screen interface connection;

fig. 17 is a leakage test output circuit diagram;

fig. 18 is a power module circuit diagram.

Detailed Description

As shown in fig. 1 to 17, each relay protection module uses an IAP15F2K61S2-SKDIP28 chip as a core, and the description of the relevant pins of the relay protection module

Input device

The pin Open In is input of a forward starting signal, the pin ReOpen In is input of a reverse starting signal, the pin Status In is input of a forward relay attraction signal, the pin ReSatus In is input of a reverse relay attraction signal, the pin Close In is input of a stop signal, the pin CurrentA is input of an a to current sensor, the pin CurrentB is input of a B to current sensor, the pin CurrentC is input of a C to current sensor, and the pin CurrentL is input of a leakage current to current sensor.

Output of

En OUT is the positive relay start signal output, pin ReEn OUT is the negative relay start signal output, pin Dis OUT is the relay shutdown signal output, + is the positive pole, -is the negative pole.

485+ and 485-are RS485 bus interfaces

A6-bit DIP switch of the J4HAM-06HWB-R is used for controlling the working voltage level and setting the limit breaking current.

When the IAP15F2K61S2-SKDIP28 receives an enabling signal (a positive enabling signal input or a reverse enabling signal input), IAP15F2K61S2-SKDIP28 sends OUT a relay starting signal (pin En OUT or pin ReEn OUT) through an output port, pulls in a corresponding vacuum alternating current contactor by driving K2 or K3, after the IAP15F2K61S2-SKDIP28 vacuum AC contactor attracting signal, A/D sampling processing is carried out on the current values of the three current sensors, the overload performance and the open-phase protection performance are carried out on the work of the vacuum alternating current contactor, when overload or phase failure is found, IAP15F2K61S2-SKDIP28 outputs a shutdown signal, and a signal drives K1 to shut down the output of the vacuum AC contactor, otherwise, the vacuum AC contactor is kept in a working output state, and the vacuum AC contactor is shut down unless IAP15F2K61S2-SKDIP28 receives a shutdown signal input. And under the condition that the four paths of outputs do not work, the working switch is turned to the leakage test position, and the four paths of leakage current display positions of the display screen are all indicated in red. At the moment, the working switch can be turned to the fault clearing position for 3-5 seconds and then to the working position, at the moment, the leakage indication is changed into green, and normal start-stop operation of each path can be carried out. If a loop does not exhibit leakage faults, the leakage protection function of the loop should be checked.

And overload short-circuit protection, wherein the output analog quantity of the current transformer is respectively sent to the A/D application of IAP15F2K61S2-SKDIP28 and the input of a U7 comparator through the adjustment and conversion of an IPC network of D1, D2 and D3, when any phase of an A/D sampling value is continuously subjected to 200ms of rated working current which is more than ten times after the vacuum alternating-current contact work is started, an IAP15F2K61S2-SKDIP28 sends out a shutdown signal to shut off the output of the vacuum alternating-current contactor, and when the U7 comparator detects that the current value of any phase is more than 12 times of rated working current, the output of the vacuum alternating-current contactor is immediately shut off through a U4A trigger, and the state is transmitted to the IAP15F2K61S2-SKDIP 28.

And in the leakage protection, the analog quantity of the leakage current sensor is sent to the U7 comparator through the D4 and an IPC network thereof, when the leakage current is detected to be more than 30mA, the U4B is triggered, the output of the vacuum alternating current contactor is immediately turned off through the output of a pin U4B, and meanwhile, IAP15F2K61S2-SKDIP28 is informed.

And the RS485 interface can output the working state of the module to the centralized control module through the 485 interface, and can also receive various operations such as starting, stopping, locking, unlocking and the like of the centralized control module.

Centralized control module JKMK description

The operating voltage is sent from the state setting of J7(HAM-03HWB-R) to IAP15W4K60S4-PDIP40 to identify 380V, 660V and 1140V, so that the IAP15W4K60S4-PDIP40 can perform equivalent conversion on the A/D value of the operating voltage.

The working voltage is converted by a voltage transformer and then input into a centralized control module through a P3 joint, wherein one path of the working voltage is sent to an IAP15W4K60S4-PDIP40 through D1, D2, D3 and an IPC network thereof and converted into digital quantity of the working voltage, and the other path of the working voltage is compared and regulated by U1 and sent to TC783A for positive sequence, reverse sequence and missing item judgment, and then the state of the working voltage is sent to the IAP15W4K60S4-PDIP 40.

And the working state input is used for receiving three state quantity inputs of a control panel state switch through a P8 joint, and is divided into leakage test, working and fault clearing respectively. When in leakage test, the IAP15W4K60S4-PDIP40 outputs a control signal to enable the normally open point of K2 to be connected and output a current larger than 30mA, the leakage correction detection is carried out on the four-path leakage sensor and the detection circuit, and when in a fault clearing state, the IAP15W4K60S4-PDIP40 clears the clearing fault in the current work.

The centralized control module is provided with two 485 interfaces, namely P6 and P7, which are internally and externally connected 485 interfaces. The operation mode is divided into two modes, one is a local operation mode. And each relay protection module independently finishes start-stop control in a local operation mode, reports the working state of each relay protection module to the centralized control module through the bus, and concentrates the working state on the operation panel for display. The second mode is a remote operation mode. If the operation mode is a remote operation mode, the four paths of output start-stop operation are all started and stopped by the main control module to receive remote start-stop operation commands, then the main control module reaches each relay protection module through the internal 485 bus, and all start buttons on the operation panel are forbidden to operate. Only the stop button can be used as a stop operation in the emergency state. The motor remote start-stop operation requirements of various conditions can be received through an external bus of the main control module.

P4 and P5 are two serial connectors, P4 is a download connector, and P5 is a debugging interface.

T-1 and T-2 are transformers, T-1 output AC36V is a working power supply of a coil of the vacuum alternating current contactor, and T-2 output AC24V outputs a direct current working power supply which provides DC 5V and DC12V voltage through a power supply module to serve as a control circuit.

The utility model discloses divide the 380/660/1140V three phase current of input into four ways output, can control the power supply of the mining electromechanical device of four ways at most, each way output current reaches 50A. The system is composed of an isolating switch, four alternating-current vacuum relays (KM1-4), a four-way output relay protection module (JDBH1-4), a centralized control module (JKMK), a display unit (XSP), a power supply unit (DY) and the like. The isolating switch realizes the electrical isolation of the input power supply and the internal parts of the equipment, and ensures the safe operation and use of the equipment. The vacuum alternating current contactor realizes the connection and disconnection of a four-way three-phase power supply. The four-path relay protection module respectively realizes the functions of on-off control, overvoltage and undervoltage, overload protection, short-circuit protection, leakage protection and the like of the four-path vacuum alternating current contactor, and four-path output can be subjected to independent breaking control. The centralized control module realizes centralized control of the four-path relay protection module and sends the working state of the equipment to the display unit for display. The display unit displays the main technical parameters of the equipment and the working state of each channel.

Claims (3)

1. Mining flame-proof type multiloop vacuum electromagnetic starter, its characterized in that: including isolator GLHK, the transformer, centralized control module JKMK, display screen XSP, four relay protection modules, four vacuum ac contactor, the isolator input is connected to external three-phase alternating current power supply, the isolator output is connected to four vacuum ac contactor input and transformer input, a relay protection module of every vacuum ac contactor control end correspondence connection, every vacuum ac contactor output is external three-phase alternating current power supply output, centralized control module JKMK passes through RS485 with every relay protection module and is connected.

2. The mining flameproof multi-loop vacuum electromagnetic starter according to claim 1, characterized in that: each relay protection module comprises a cpu control module circuit taking an IAP15F2K61S2-SKDIP28 chip as a core, a Connector D Connector25 plug and a start/stop feedback circuit, a relay control module circuit, a current and leakage current conversion module circuit, an overcurrent and leakage emergency stop control circuit, a working state setting module circuit and a relay protection module RS485 communication interface circuit, wherein the Connector DConnector25 plug and the start/stop feedback circuit, the relay control module circuit, the current and leakage current conversion module circuit, the overcurrent and leakage emergency stop control circuit, the working state setting module circuit and the relay protection module RS485 communication interface circuit are all connected with the cpu control module circuit taking the IAP15F2K61S2-SKDIP28 chip as the core, and the Connector D Connector25 plug and the start/stop feedback circuit are connected with the current and leakage current conversion module circuit.

3. The mining flameproof multi-loop vacuum electromagnetic starter according to claim 1, characterized in that: the JKMK comprises a three-phase voltage phase sequence and open phase detection circuit, a working voltage sampling input module circuit, a centralized control module state setting circuit, a CPU control module circuit taking a LAP15W4K60S4-PDIP40 chip as a core, a centralized control module RS485 communication interface circuit, a centralized control module download interface circuit, a display screen interface connecting circuit and an electric leakage test output circuit, wherein the three-phase voltage phase sequence and open phase detection circuit, the working voltage sampling input module circuit, the centralized control module state setting circuit, the centralized control module RS485 communication interface circuit, the centralized control module download interface circuit, the display screen interface connecting circuit and the electric leakage test output circuit are connected with the CPU control module circuit taking the LAP15W4K60S4-PDIP40 chip as the core.

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