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Type: Posts; User: mksj

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    Consider a 20 Hp Phase Perfect PT020 followed by...

    Consider a 20 Hp Phase Perfect PT020 followed by a 3 phase step up transformer. RPC to step-up transformer. A single phase transformer could be used to step the voltage to 380V followed by a VFD,...
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    Older motors probably have a constant torque of...

    Older motors probably have a constant torque of 2:1, newer (non-inverter) motors 4:1, so most likely you will loose torque below 20-30Hz. Torque of the motor is probably not reduced at 30 Hz, but you...
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    I would be cautious of just buying a brand...

    I would be cautious of just buying a brand without understanding the various models and what they come with as standard features. A good example is the WEG CFW300 VFD drives, only the B frame size...
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    RFI filter (Radio Frequency Interference) and EMI...

    RFI filter (Radio Frequency Interference) and EMI filter (ElectoMagnetic Interference) help attenuate these common forms of electrical interference generated from VFD's. These VFD RFI/EMI filters...
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    Hitachi WJ200-015SF ($275-300), they work and...

    Hitachi WJ200-015SF ($275-300), they work and never had a problem with them. Control from their front panel is poor in my opinion for routine use,but very easy to have a separate pod for the machine...
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    The voltage spec. usually has a range, you could...

    The voltage spec. usually has a range, you could check with Hitachi for this particular model. A standard VFD would not be a plug and play option in this application. You might look at a PhasePerfect...
  7. Also Yaskawa drives (see attached which specifies...

    Also Yaskawa drives (see attached which specifies 240/480 single phase input), typically you need to double the drive rating and use a DC choke. Per above call the manufacturer tech., on the AD GS4...
  8. Convention is to step up the voltage before the...

    Convention is to step up the voltage before the VFD, and then to run a 440V VFD with a direct connection to the motor. Typical transformers are made to operate at a given line frequency, and cannot...
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    You are better off, and it will be less expensive...

    You are better off, and it will be less expensive to just replace the motor with a single phase one. You will also need to replace the thermal overload for one sized to a single phase motor. The...
  10. Thread: Will a vfd work?

    by mksj
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    The VFD does not output sinusoidal 3 phase, the...

    The VFD does not output sinusoidal 3 phase, the output is a series of many DC pulses that simulate an AC wave. It is unlikely that your controller will run correctly under these circumstances and...
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    The spec. is 2K for Yaskawa VFD's, in my...

    The spec. is 2K for Yaskawa VFD's, in my experience anything in the 2-5K should be fine. The other problem is that the tension of the wiper goes and the speed becomes erratic and/or the track...
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    You will lose Hp below the motor's base speed, so...

    You will lose Hp below the motor's base speed, so may be a bit anemic if you go below something like 30Hz. Older motors I tend to be a more conservative in the carrier frequency and RPM range. Since...
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    The term supercharging is what others have used...

    The term supercharging is what others have used in the literature, but call it what you want. What I do not follow with this technique is that you are doubling the motor's designed power dissipation...
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    Regarding extending the 230V wired motor to...

    Regarding extending the 230V wired motor to 120Hz/460V I have seen referred to supercharging the motor, below is some information I reviewed in the past but haven't tried it yet. Intriguing in...
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    Using an inverter type motor I maintain typically...

    Using an inverter type motor I maintain typically +/-2 RPM regardless of load on mills and lathes with sensorless vector. The RPM accuracy is typically something on the the order of 0.1%. An encoder...
  16. As stated RTFM in these politically times, it...

    As stated RTFM in these politically times, it works as as previously indicated.

    272471
  17. I believe the issue is on that particular the...

    I believe the issue is on that particular the power supply is 12V, and the voltage range for the speed input is 0-10V, so a voltage divider at the top would give a full 0-100 range on the pot, w/o...
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    Cost difference on a power consumption is minimal...

    Cost difference on a power consumption is minimal doing the same workload, cost of the VFD installation and service requirements would be 2-3X more expensive for a 10Hp VFD setup/motor vs. 5Hp. I am...
  19. No problem with 2Hp, I would go with a 2Hp unit...

    No problem with 2Hp, I would go with a 2Hp unit which is a more common rating size. WJ200-15SF run around $280, so similar to ABB, either one would be a good choice. They all should do well with...
  20. Yasakawa for that model species 0.75kW/5.0A under...

    Yasakawa for that model species 0.75kW/5.0A under heavy duty mode, so should work but may be close to the rated limit. ABB would be much cheaper, also look at the Hitachi WJ200-15SF, Yaskawa would be...
  21. You are assuming that the motor is 230VAC, I...

    You are assuming that the motor is 230VAC, I would first get more details about the voltage and controls. Most VFDs cannot step-up the voltage, the exception is 120 input to 230VAC output 3 phase,...
  22. Thread: wiring 110v

    by mksj
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    Connect to any of the two input terminals per the...

    Connect to any of the two input terminals per the description for the HY02D211B. Based on the output current you would need a 30-40A 120V input connection/breaker. The input is based on the VFD...
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    Invertek VFD is a poor choice for a lathe, at...

    Invertek VFD is a poor choice for a lathe, at least the current common smaller models sold in the US. Very limited number of programmable inputs and programmable features. Did a recent design/build...
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    Evidently you only like to pontificate endless...

    Evidently you only like to pontificate endless nonsense according to the world of "Thermite", nor did you read the last line of my post. He already indicated that he felt the cost of the brake repair...
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    I have installed numerous VFDs on lathes that did...

    I have installed numerous VFDs on lathes that did not have a mechanical brake, and also many that do. The VFD on smaller lathes as others have indicated can stop the spindle in ~1 second, so is...
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