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  1. nado59

    fluid compressibility - spring effect

    BigInch, Thank you! So it was good old Mr Newton again :-) Very clear explanation from you, many thanks again!
  2. nado59

    fluid compressibility - spring effect

    Dear All, I have found a brief statement that the spring effect of compressed fluid in hydraulic devices depends on the jerk (first derivative of acceleration) of the piston movement. I can clearly see from an experiment that this is true but I would like to know the detailed explanation. My...
  3. nado59

    VFD problem to run at low frequencies

    Dear Skogsgurra and All, Finally I have found the source of the problem. The motor has 12 wires and it was wired wrongly, it was in delta but wiring it to delta-delta, solved the issue. I am sorry! Thank you for your time! At least I learnt a lot from you comments. I will get into the PID...
  4. nado59

    VFD problem to run at low frequencies

    Dear All, Thank you for the further info. I got some idea from your post. DickDV - You wrote: “Just as I suspected, the tuning you did is to create a model model.” I am not sure what you meant by this. Actually I started to wonder if my problem could be something to do with the motor and not...
  5. nado59

    VFD problem to run at low frequencies

    Dear All, Thank you to everybody, I am going to answer to all of you in this post. DickDV The manual of the Bonfiglioli VFD says under the other functions: PID control. The following parameters can be set: 11-0: PID Operation Selection 0000: PID disable 0001: PID enable (Deviation is...
  6. nado59

    VFD problem to run at low frequencies

    Hi, I am a mechanical/automotive engineer with limited knowledge in Electrical/Electronic engineering. I have a machine driven by a 2.2kW motor with an VFD, both the motor and the VFD made by Watt, the VFD is model L2500, it is a basic model, no Vector Control. I changed the Watt VFD to a...
  7. nado59

    oversteer measurement formula in Motec i2

    Hi, I had a look of the Motec i2 pro software. There is a maths function delivered with it, which calculates oversteer. According to my (very limited) knowledge, there is no low-cost way to get a reliable measure of oversteer/understeer. The formula in the software uses only the vehicle speed...

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