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A 2.2 Kw inverter is no responding properly to a 4-20ma signal

The 4-20ma signal is generated by a current transformer on one of the phases of a 25Kw mill motor. The aim is to maintain a steady milling load of 45-50 amps on the mill motor.The 2.2 Kw inverter is running a rotory valve to feed the mill. As the mill amps goes up the rotory valve motor should slow down and speed up when the mill motor amps go down. This system has been working well for about three years but in the last four months it is performing very erratically. The parameters are set as :- F201 = 60%
F202 = 15.5?
F203 = 100?
F 204 = 8.7 hz
To try and keep the system working the opperator changes parameter F 204 from between 6.5 and 10

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  • sean_reihill Jan 10, 2009

    It is not practical to replace the motor as it is a special motor

  • sean_reihill Jan 12, 2009

    The Variable Speed Drive is a 2.2 Kw Toshiba VF-97

  • sean_reihill Jan 14, 2009

    Thanks to all who replied but none of the solutions are of any help .I am going to try a different type of control Over and out.

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Check the windings maybe there is ashorted one..

Posted on Jun 11, 2009

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Hi! Did you checked out the frequency control. Is it set to default settings? If frequency is not the issue then the problem is with PI (proportional-integral) controller using which the variable speed is acheived.

Thanks
Rylee

Posted on Jan 12, 2009

  • Rylee Smith
    Rylee Smith Jan 12, 2009

    Ask for clarifications

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Replace fuse condustor.set new fuse conductor.

Posted on Jan 10, 2009

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The problem can be due to

  • The motor has an improper voltage rating .

  • The motor terminal voltage is too low .

  • The reduction gear ratio is not properly set .

  • Adjust the base frequency

Posted on Jan 08, 2009

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Sir,

Click this link for more info. let me know if it is helpful or not

which inverter model and brand name do u using? tell me the details of ur products do u have

thanks
good luck

Posted on Jan 08, 2009

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Check out the speed after replacing the motor at 1 end and see.or clean the motor.and check out.

Posted on Jan 08, 2009

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Thank you for allowing us to help, please respond with further questions and concerns

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Hello, thank you for sharing your problem with us, I would personally be happy to provide the most accurate and up to date information for you.



Hello, your direct question is "Do I need to replace again the inverter or are the settings off-I went to factory default?"



There is no need to change the inverter at this time. When you set the device at factory default, it caused a MISCONFIGURATION between the "Diasy Chained" inverters.



SOLUTION



1. CAUTION - YOUR WORKING WITH HIGH VOLTAGE REGULATION AND INVERTERS

2. POWER OFF YOUR DEVICES AS LONG AS IT IS SAFE TO DO SO.

3. ONLY POWER UP YOUR INVERTERS FIRST

4. PROVIDE SEVERAL MINUTES WAIT TIME UNTIL EACH OF YOUR INVERTERS ARE COMPLETELY BOOTED

5. FEEL FREE TO INITIATE THE AC ALTERNATING CURRENT SOURCE AT THIS TIME

6. WAIT SEVERAL MINUTES TO ALLOW THE CURRENT TO RUN THROUGH THE COMPLETE CIRCUIT OR INVERTER DAISY CHAIN.



PLEASE RETURN IF YOU REQUIRE FURTHER HELP ON YOUR SAME PROBLEM.



THANK YOU

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