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Protection method of motor overload and phase loss protection circuit in cast pipe production line

A phase loss protection circuit, protection circuit technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of increased motor damage, high production costs, loss, etc., to reduce maintenance costs and reduce artificial resets The workload and the effect of reducing equipment failures

Active Publication Date: 2018-07-03
WUHU XINXING DUCTILE IRON PIPES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrical protection function loses its effect in the above several stations, the amount of damage to the motor increases, and the production cost remains high

Method used

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  • Protection method of motor overload and phase loss protection circuit in cast pipe production line
  • Protection method of motor overload and phase loss protection circuit in cast pipe production line
  • Protection method of motor overload and phase loss protection circuit in cast pipe production line

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Embodiment Construction

[0025] The specific implementation of the present invention will be described in further detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

[0026] Such as figure 1 The structure of the present invention expressed is a motor overload and phase loss protection circuit effectively applied to the cast pipe production line, the main motor is a 22kW grinding head motor, which is a three-phase motor, and is connected to a three-phase power supply through a ZK switch .

[0027] The motor overload and phase loss protection circuit is provided with a PLC control system, the main circuit of the motor is controlled by the main contact of the AC contactor KM, and the coil of the AC contactor is controlled by the contact of the relay J1, The coil of the relay is controlled by the P...

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PUM

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Abstract

The invention discloses a protection method for a motor overload and phase loss protection circuit in a cast pipe production line. The protection circuit is provided with a PLC control system, the main circuit of the motor is controlled by the main contact of an AC contactor, and the coil of the AC contactor is controlled by a relay. The contact is controlled, and the coil of the relay is controlled by a PLC control system; on the two-phase circuits of the main circuit of the motor, an AC current transmitter is respectively arranged, and the AC current transmitter is connected with the PLC control system. The invention also discloses a protection method for the circuit. Using the above technical scheme, the protection function of motor overload and phase loss is realized; the protection failure problem caused by artificially increasing the protection setting value is prevented, the safe operation of the motor is effectively protected, equipment failures are reduced, and maintenance costs are greatly reduced; After a fault occurs, it will automatically reset within the set time, reducing the workload of manual reset, restoring the operating state, and reducing the workload of manual reset required by the original protection.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment automatic control systems, and relates to a protection control system for a cast pipe production line. More specifically, the present invention relates to a protection method for a motor overload and phase loss protection circuit of a cast pipe production line. Background technique [0002] On the ductile cast iron pipe production line, there are multiple ring cutting, chamfering and internal grinding stations. Due to the nature of the work, these stations have relatively high requirements for the adjustment of mechanical equipment. When the mechanical equipment is not adjusted properly, or needs to be adjusted again due to modification, vibration, etc., the load of the motor changes greatly, causing the motor to be overloaded. Due to the trouble of mechanical adjustment, often the post operator will increase the setting value of the motor protection, which makes the motor protectio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/085H02H7/09
Inventor 李宪峰岳江峰
Owner WUHU XINXING DUCTILE IRON PIPES