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Method and system for flexibly starting multiple motors by frequency converter based on PLC (programmable logic controller)

A technology of multiple motors and frequency converters, applied in the field of control, can solve problems such as complex implementation, high investment cost, and large starting current, and achieve the effects of reduced failure rate, stable and reliable operation, and improved centralized management technology

Inactive Publication Date: 2015-07-22
HAINAN VOCATIONAL COLLEGE OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the purposes of the present invention is to solve the problems of large starting current, complex implementation and high investment cost of multiple motors, and to provide a PLC-based inverter control inverter with stable and reliable operation, low failure rate, convenient maintenance and low cost. Multiple motor method and system

Method used

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  • Method and system for flexibly starting multiple motors by frequency converter based on PLC (programmable logic controller)
  • Method and system for flexibly starting multiple motors by frequency converter based on PLC (programmable logic controller)

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Embodiment

[0031] Such as figure 2 As shown, the control flow of the embodiment of the present invention is as follows:

[0032] 1. Turn on the power to initialize the control components of the system;

[0033] 2. Check whether the preparation of each component is completed, if so, enter the third step, if not, return to the first step;

[0034] 3. Inverter 2 parameter setting;

[0035] 4. Check whether the operation mode of the inverter 2 is set to the external operation mode, if so, go to the fifth step, if not, return to the third step;

[0036] Five, start, the Nth motor 6 starts;

[0037] 6. Check whether the motor 6 is started, if so, enter the seventh step, if not, the PLC controller 3 judges that the equipment is faulty, and then directly skip to the ninth step;

[0038] 7. Check whether the start-up frequency reaches 50Hz, if not, go to the eighth step, if not, but enter the eighth step forcibly, it will crash, then adjust the start-up setting time parameters of the inverte...

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Abstract

The invention discloses a method and a system for flexibly starting multiple motors by a frequency converter based on a PLC (programmable logic controller). The output end of the frequency converter is connected with a first serial circuit contact to form a first serial connection circuit, the first serial circuit, a breaker and a second serial circuit connected with a second serial circuit contact serially make up a parallel circuit, and the parallel circuit is connected with motors, the second serial circuit contact is connected with the motors, the parallel circuit is serially connected with a power source bus by the breaker at the input end of the frequency converter, the PLC comprises two input ends and two output ends, one of the input ends is connected with the power source bus, and the other input end is connected with a sensor and a PLC flexible start button; one of the output ends is connected with the frequency converter, and the other output end is connected with the contact. The motors can be started by one frequency converter, one-off investment cost can be reduced, the motors can stably and reliably operate, fault rate is effectively decreased, maintenance is facilitated, and the intensive management technology of a production line is improved.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a method and system for controlling a frequency converter to soft-start multiple motors based on PLC. Background technique [0002] With the continuous development of microelectronics technology, control technology and information technology, programmable logic controller PLC (Programmable Logic Controller, referred to as PLC) control technology has also been rapidly developed, and in water purification, solar energy development, crack detection, garbage It has been applied in many fields such as processing. In terms of motor starting, when a large-capacity motor is started directly, the current is particularly large, which is 4-7 times the rated current, and the voltage drop caused in the grid greatly affects the operation of other electrical equipment; Coupling transformer step-down start, Y-△ (star-delta) step-down start, and inverter start-up of a single motor ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/54
CPCH02P1/58H02P1/54
Inventor 杨征
Owner HAINAN VOCATIONAL COLLEGE OF SCI & TECH