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Recent content by mksj

  1. M

    VFD running a air compressor and regenerative effects causing over-current faults?

    You use a 2 stage compressor ideally so that it cycles less often, so you pump it up to 175PSI and the it will cycle back on at between 125-135 PSI depending on the settings. I run my air system with a primary high flow regulator at 125 PSI and step down regulator at each outlet location, that...
  2. M

    VFD running a air compressor and regenerative effects causing over-current faults?

    You give no specifics to the pump. Reciprocating compressor pumps are usually rated for a range of Hp, but the pulley size is smaller and the pump runs slower. It is possible that you have the wrong belt ratio, a mechanical issue causing increased load or a component issue. If your VFD was rated...
  3. M

    VFD running a air compressor and regenerative effects causing over-current faults?

    Braking resistor has nothing to do with a current fault/acceleration/running. Stop mode should be free run, i.e. no braking. You can increase the motor overload parameter to something like 180% if it is a newish motor, this should increase the amperage for up to 1 minute. You might try to...
  4. M

    VFD for Cincinnati lathe with 3HP. Motor data plate pic attached.

    If this is a hydrashift lathe, then the motor is controlled separately from the engagement handle. The ones posted online have push buttons to run the motor/direction and then the spindle/feed/braking is controlled by the Hydrashift/mechanical handle. The linkage back to the filter/pump may be...
  5. M

    VFD for Cincinnati lathe with 3HP. Motor data plate pic attached.

    I would not spend the extra money on an oversized 3 phase inpiut VFD, there are plenty of single phase input VFD's in the $300-400 range with good support and a US based warranty. I am only including suggestions for those that are showing in stock. Hitachi WJ200-022SF, WEG CFW300B10P0B2DB20...
  6. M

    Can someone please help me replace the VFD on my lathe?

    You should put in the parameters that were original to your machine, I would not assume that they are all the same. Mechanically 4P motors are fine at 2X their base speed, not uncommon to get a wide speed range with limited mechanical belt/gear ratios. Performance wise standard motors will have...
  7. M

    Can someone please help me replace the VFD on my lathe?

    The Lapond is basically the same VFD as the HY which is banned here. I can understand why your friend had so many problems with it because they are usually setup for high speed router motors with totally different parameters. The manuals tend to be horrible, and depending on the model they...
  8. M

    Can someone please help me replace the VFD on my lathe?

    Standard 3 phase induction motor, not permanent magnet. That VFD is 220V VFD, so you would need a small step down transformer 240 to 120 to power the tach. https://www.ebay.com/itm/163655686505
  9. M

    Can someone please help me replace the VFD on my lathe?

    The tach input voltage is different depending on the model, one is for 120V (JWL1642-130) and the other is for 220V (JWL1642-130A). The replacement tach/display will cost as much as the VFD. Some 1 Hp VFD's can output higher amps, so something like the WJ200-007MF: Constant Torque, Sensorless...
  10. M

    VFD store or outlet suggestion. 10Hp .

    Seems repetitious of what I already posted and no real reason to post the FRN010G1S-2U, but as you like to say RTFM. Oh, forgot, they do not always list the derating there, it is often in the technical bulletin or separate specifications sheet per what was provided. Done with this. Go back and...
  11. M

    VFD store or outlet suggestion. 10Hp .

    FRN010G1S-2U Zoro is a 3 phase unit, although they indicate it will run on single phase it is in a derated mode. Don't always believe what websites say, always go back to the source. In general for both Fuji and Teco, the derating factor for single phase input is 0.5 X the rated 3 phase input...
  12. M

    VFD store or outlet suggestion. 10Hp .

    In general, the largest commonly available single phase input VFD size is 5Hp, and there are very few models. Beyond this Hp rating, basically you need to go to 3 phase input versions and run them in derated mode. VFD's have different deratings for each model/Hp/voltage rating, so you need to...
  13. M

    VFD store or outlet suggestion. 10Hp .

    Compressors are known to be harder starting and coming to full pressure for motors so would typically require the VFD to be run in HD mode. This effects the VFD derating, and also the kHz carrier frequency setting as well as single phase input will effect the overall derating of the VFD. VFD...
  14. M

    Drinking from the VFD info firehose

    Some VFD's have a rapid or emergency stop, but it requires a sustained input not a momentary, at least the ones I have used. The on-machine E-Stops I use a NC contact block which either is directly wired to the run controls or operates a latched relay which drop out and prevents restart as well...
  15. M

    Drinking from the VFD info firehose

    Actually you should not use an existing contact if it has been used to carry current, they build up resistance from arching and will not conduct the low voltage of the VFD signals very well which are a few mA. You still want some type of safety power relay system so if the power drops out and...
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