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Application of PLC in the control frequency converter
by：Coolmay
2020-07-16
Control requirements through on-line CPU224XP type PLC and MM420 frequency converter, motor three speed frequency control operation, press the start button SB1, motor starting and running in the first paragraph, the frequency of 10 hz, delay after 20 s motor running in the second paragraph, the frequency of 20 hz, delay again after 10 s motor reverse run in the third paragraph, frequency 50 hz,.
Press the stop button, the motor stops running.
(
1)
PLC controller I/O address allocation DIN1 digital input transducer, DIN2 port through P0701, P0702 parameter set to three sections of fixed frequency control side, the frequency of each frequency band respectively by p, P1002 and P1003 parameter Settings.
Inverter digital input DIN3 port is set to the motor running, stop control side, but by P0703 parameter Settings.
钱数。
0 Q0 motor stop button.
Zero: digital terminal 5 (
DIN1)
钱数。
1 Q0 motor start button.
1: digital terminals 6 (
DIN2)
。
3: digital terminal 7 (
DIN3)
(
2)
Circuit diagram and program PLC inverter control instruction USS through USS protocol and frequency converter, using USS commands in the library of the existing subroutine and interrupt program to make easier control of the inverter.
Can use USS command control frequency converter and read/write to the parameters of the frequency converter.
used in inverter control programming software need to install the STEP 7
Micro/WIN instruction library (
库)
, in the library USS Protocol provide inverter control instruction.
as shown.
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through case explained the application of PLC control of frequency converter, including PLC online multistage velocity control of USS control requirement, PLC, frequency converter control instructions.
Shenzhen Coolmay Technology Co., Ltd. thinks that a good rule of thumb to determine whether you're working on a project.
All of the experts Shenzhen Coolmay Technology Co., Ltd. consulted stressed that the best recovery plans are the ones made before you need them, not afterward.
With this competency, Shenzhen Coolmay Technology Co., Ltd. provide high technology and assist customers to create added value and contribute to the development of producing plc manufacturers.
Further dialogue of Coolmay between the approaches, the chapter concludes, could lead to actionable advice on more robust policies that drive both structural change and competitiveness upgrading.
Shenzhen Coolmay Technology Co., Ltd. is an online resource for today's modern woman to live a green, healthy, and happy life. We offer plc manufacturers, plc controller price and more! Pls visit our site at Coolmay PLC to know more.
