CN202798126U - Automatic switching system for uninterrupted power supply of PLC (programmable logic controller) - Google Patents

Automatic switching system for uninterrupted power supply of PLC (programmable logic controller) Download PDF

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Publication number
CN202798126U
CN202798126U CN 201220459858 CN201220459858U CN202798126U CN 202798126 U CN202798126 U CN 202798126U CN 201220459858 CN201220459858 CN 201220459858 CN 201220459858 U CN201220459858 U CN 201220459858U CN 202798126 U CN202798126 U CN 202798126U
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China
Prior art keywords
power supply
plc
uninterrupted power
circuit breaker
uninterrupted
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CN 201220459858
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Chinese (zh)
Inventor
刘利群
鲍海鹏
高军
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Beijing Drainage Group Co Ltd
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Beijing Drainage Group Co Ltd
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Priority to CN 201220459858 priority Critical patent/CN202798126U/en
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Abstract

The utility model provides an automatic switching system for uninterrupted power supply of a PLC (programmable logic controller). One end of a first power supply circuit breaker is connected with a 220V city power live wire, the other end of the first power supply circuit breaker is connected with a first live wire connection end of an uninterrupted power supply, a first zero wire connection end of the uninterrupted power supply is connected with a zero wire, one end of a second power supply circuit breaker is connected with the 220V city power live wire, the other end of the second power supply circuit breaker is connected with one end of a power supply switching relay, and a second zero wire connection end of the uninterrupted power supply and a zero wire connection end of the programmable logic controller are connected with the zero wire. A two-way automatic switching circuit is used for supplying power to the PLC, reliability is greatly improved, response speed is high by the aid of an automatic switching mode of the relay, manual intervention is omitted, alarm prompt is realized after switching, inspection and maintenance staff can immediately find the alarm promotion, and uninterrupted power supply of the PLC is ensured when the UPS (uninterrupted power supply) fails and is maintained.

Description

A kind of PLC uninterrupted power supply automatic switchover system
Technical field
The utility model relates to a kind of PLC uninterrupted power supply automatic switchover system, belongs to PLC power switching systems technology field.
Background technology
Programmable Logic Controller (PLC) has been widely used in industrial control system at present, it is the core of whole control system, also be to realize the most important equipment of whole factory automation, in case PLC accident power-off, to cause whole control system paralysis, so the power supply reliability of PLC is vital in Industry Control.The automation industry is powered to PLC and is generally adopted dual mode at present.The first is that directly power taking accesses the PLC power module from electric power system.This mode shortcoming is apparent, when the electric power system fault, short circuit, tripping operation etc. occur, and PLC is dead electricity immediately, the robot control system(RCS) paralysis.The second is, before the PLC power module, seals in ups power, when have a power failure or during the electric power system fault, UPS powers to PLC, when striving for that for the technical staff certain hour is fixed a breakdown, protects positive PLC normal operation temporarily.This mode generally adopts at present, but shortcoming also clearly.At first, in 3~5 years general life-spans of UPS battery module, when near the life-span, be prone to fault, because it seals in the PLC current supply circuit, in case fault will cause the PLC dead electricity.Secondly, UPS needs periodic maintenance, needs regularly carry out its fan the maintenance works such as dedusting and deep discharge, these work carry out the normal power supply that certainly will affect the PLC system.To sum up, two kinds of popular supply power modes all can not satisfy the high reliability request that PLC powers at present.
Summary of the invention
The purpose of this utility model is all to satisfy the problem of the high reliability request of PLC power supply in order to solve existing two kinds of popular supply power modes, and then a kind of PLC uninterrupted power supply automatic switchover system is provided.
The purpose of this utility model is achieved through the following technical solutions:
A kind of PLC uninterrupted power supply automatic switchover system; comprise: uninterrupted power supply; Programmable Logic Controller; three power switching relays; fuse; current supply circuit circuit breaker one; current supply circuit circuit breaker two and red warning light; one end of described current supply circuit circuit breaker one is connected with 220V civil power live wire; the other end of current supply circuit circuit breaker one is connected with the first live wire link of uninterrupted power supply; the first zero line link of uninterrupted power supply is connected with zero line; the protective wire link of uninterrupted power supply is connected with protective wire; one end of current supply circuit circuit breaker two is connected with 220V civil power live wire; the other end of current supply circuit circuit breaker two is connected with an end of power switching relay; the other end of power switching relay is connected with the second live wire link of uninterrupted power supply and an end of fuse respectively; the other end of fuse is connected with the live wire link of Programmable Logic Controller; the second zero line link of uninterrupted power supply and the zero line link of Programmable Logic Controller all are connected with zero line; the protective wire link of Programmable Logic Controller is connected with protective wire; one end of red warning light is connected with zero line; the other end of red warning light is connected with an end of power switching relay; the other end of power switching relay is connected with 220V civil power live wire, is parallel with the power switching relay on the uninterrupted power supply.
The utility model has the advantage of: 1, adopt the two-way automatic switch-over circuit to provide power supply for PLC, greatly improved reliability.2, switch the mode that adopts relay to automatically switch, fast response time need not manual intervention.3, after the switching alarm is arranged, tour, attendant can find immediately.4, guarantee when the UPS fault and during maintenance the PLC uninterrupted power supply.5, with low cost, only add a small amount of electric elements and realized automatic switching function.6, method for designing is simple, and the user can implement according to design drawing and explanation at any time.
Description of drawings
Fig. 1 is the structural representation of a kind of PLC uninterrupted power supply of the utility model automatic switchover system.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail: present embodiment is implemented under take technical solutions of the utility model as prerequisite, has provided detailed execution mode, but protection range of the present utility model is not limited to following embodiment.
As shown in Figure 1; a kind of PLC uninterrupted power supply automatic switchover system that present embodiment is related; comprise: uninterrupted power supply UPS; Programmable Logic Controller PLC; three power switching relay K 1; fuse FU; current supply circuit circuit breaker one F1; current supply circuit circuit breaker two F2 and red warning light UPS ALARM; the end of described current supply circuit circuit breaker one F1 is connected with 220V civil power live wire L; the other end of current supply circuit circuit breaker one F1 is connected with the first live wire link of uninterrupted power supply UPS; the first zero line link of uninterrupted power supply UPS is connected with zero line N; the protective wire link of uninterrupted power supply UPS is connected with protective wire PE; the end of current supply circuit circuit breaker two F2 is connected with 220V civil power live wire L; the other end of current supply circuit circuit breaker two F2 is connected with an end of power switching relay K 1; the other end of power switching relay K 1 is connected with the second live wire link of uninterrupted power supply UPS and the end of fuse FU respectively; the other end of fuse FU is connected with the live wire link of Programmable Logic Controller PLC; the second zero line link of uninterrupted power supply UPS and the zero line link of Programmable Logic Controller PLC all are connected with zero line N; the protective wire link of Programmable Logic Controller PLC is connected with protective wire PE; the end of red warning light UPS ALARM is connected with zero line N; the other end of red warning light UPS ALARM is connected with an end of power switching relay K 1; the other end of power switching relay K 1 is connected with 220V civil power live wire L, is parallel with power switching relay K 1 on the uninterrupted power supply UPS.
Operation principle is as follows:
1, under the normal condition, F1, F2 are closed, and UPS is from the civil power power taking, and export to PLC and transfer relay K1 by the right side terminal, the adhesive of K1 coil, and its normally-closed contact that is used for PLC power supply bypass and warning light keeps often opening, and two paths are short circuit.When civil power outage or electric power system fault, the UPS operating state changes, and utilizes battery to power for PLC, guarantees that its work is uninterrupted.
2, when the UPS fault, UPS is output voltage normally, and K1 coil losing electricity then can't adhesive, two normally-closed contacts of K1 are closed immediately, and PLC can be directly from the utility grid power taking, and prestissimo automatically switches to bypass power supply, and UPS ALARM lamp is bright, and prompting UPS does not work, and needs the attendant to check.No matter keep in repair or change UPS this moment, all the PLC electric power system do not impacted.
3, need clean or discharge when safeguarding as UPS, the UPS of manually leaving behind is for electric brake F1, UPS is the PLC power supply with automatic discharging, waits for that its battery electric quantity exhausts, when PLC automatically switches to bypass power supply, namely finish discharge work, and can pull down its terminal connections, to its safeguard, cleaning etc., not only guarantee attendant's safety but also guarantee that the PLC power supply is normal, and UPS alarm lamp Chang Liang in all processes, the prompting staff.
The above; it only is the better embodiment of the utility model; these embodiments all are based on the different implementations under the utility model general idea; and protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claims.

Claims (1)

1. PLC uninterrupted power supply automatic switchover system; comprise: uninterrupted power supply; Programmable Logic Controller; three power switching relays; fuse; current supply circuit circuit breaker one; current supply circuit circuit breaker two and red warning light; it is characterized in that; one end of described current supply circuit circuit breaker one is connected with 220V civil power live wire; the other end of current supply circuit circuit breaker one is connected with the first live wire link of uninterrupted power supply; the first zero line link of uninterrupted power supply is connected with zero line; the protective wire link of uninterrupted power supply is connected with protective wire; one end of current supply circuit circuit breaker two is connected with 220V civil power live wire; the other end of current supply circuit circuit breaker two is connected with an end of power switching relay; the other end of power switching relay is connected with the second live wire link of uninterrupted power supply and an end of fuse respectively; the other end of fuse is connected with the live wire link of Programmable Logic Controller; the second zero line link of uninterrupted power supply and the zero line link of Programmable Logic Controller all are connected with zero line; the protective wire link of Programmable Logic Controller is connected with protective wire; one end of red warning light is connected with zero line; the other end of red warning light is connected with an end of power switching relay; the other end of power switching relay is connected with 220V civil power live wire, is parallel with the power switching relay on the uninterrupted power supply.
CN 201220459858 2012-09-11 2012-09-11 Automatic switching system for uninterrupted power supply of PLC (programmable logic controller) Active CN202798126U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220459858 CN202798126U (en) 2012-09-11 2012-09-11 Automatic switching system for uninterrupted power supply of PLC (programmable logic controller)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220459858 CN202798126U (en) 2012-09-11 2012-09-11 Automatic switching system for uninterrupted power supply of PLC (programmable logic controller)

Publications (1)

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CN202798126U true CN202798126U (en) 2013-03-13

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CN (1) CN202798126U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105098697A (en) * 2015-09-14 2015-11-25 云南大红山管道有限公司 Power-down alarm system for uninterruptable power supply
CN108429255A (en) * 2018-03-21 2018-08-21 南京钢铁股份有限公司 PLC system is for electric installation
CN112564261A (en) * 2020-11-25 2021-03-26 神华福能发电有限责任公司 Method for preventing power loss of control power supply loop

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105098697A (en) * 2015-09-14 2015-11-25 云南大红山管道有限公司 Power-down alarm system for uninterruptable power supply
CN108429255A (en) * 2018-03-21 2018-08-21 南京钢铁股份有限公司 PLC system is for electric installation
CN112564261A (en) * 2020-11-25 2021-03-26 神华福能发电有限责任公司 Method for preventing power loss of control power supply loop

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