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  1. Most modern VFDs will work for this by simply...

    Most modern VFDs will work for this by simply doubling the amp rating of the VFD with respect to the motor nameplate amps. So if your 5HP 3 phase motor says it is 15A, buy a VFD that is rated for at...
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    Why on earth would you buy a compressor from...

    Why on earth would you buy a compressor from China with a 380V 50Hz motor on it? Cheap aint so cheap when it fails...

    But yes, if you step up your 240V 1 phase to 480V 1 phase, then feed a 480V...
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    Look at the data you posted, I have highlighted...

    Look at the data you posted, I have highlighted the pertinent info for you. It's right in the description of the VFD.

    If the VFD already SAYS it is for single phase input, that means the VFD mfr...
  4. 9100 is right, it's a CURRENT spike on energizing...

    9100 is right, it's a CURRENT spike on energizing a transformer, not a voltage spike, and it will only last a fraction of a second, usually too fast for fuses or circuit breakers to react (but not...
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    Sounds like you have a plan, but to answer your...

    Sounds like you have a plan, but to answer your first question on using a 2HP VFD on a 5HP machine, here is how that works.

    The VFD is rated for an amount of CURRENT it can safely handle. A motor...
  6. Did you measure the voltage under load, or with...

    Did you measure the voltage under load, or with no load on it? Voltage will look high with no load on the RPC, it might look different under load.
  7. Stuttering / jittering at low speed is often a...

    Stuttering / jittering at low speed is often a symptom of the drive being in what's called "Sensorless Vector Control" (SVC) mode, but you did not perform what's called an "autotune" or "Motor ID"...
  8. Thread: C-11G contactor

    by Jraef
    Replies
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    438

    That is a Taian brand contactor. Taian is the ...

    That is a Taian brand contactor. Taian is the brand name of components made by Teco (Taiwan Electric Co). They have really poor market access outside of Asia but are actually a fairly big supplier....
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    Again, does the machine NEED the neutral?...

    Again, does the machine NEED the neutral? Probably not, in which case the plug and receptacle don't need to include it.
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    Even though you may have a 4 wire system (3 Hots...

    Even though you may have a 4 wire system (3 Hots + Neutral), most 3 phase MACHINES will not use or need the neutral, they just need the 3 hots, then for safety you need the ground connection. So...
  11. Good plan, but L2 for Siemens would only refer to...

    Good plan, but L2 for Siemens would only refer to the incoming phase, the outgoing would be U, V, W in any error code. Don't bother swapping the output phases.

    Siemens are one of the most...
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    The other guy is mistaken about the entire...

    The other guy is mistaken about the entire concept.

    Whether a MOTOR is internally connected wye or delta is a decision made by the motor mfr, having to do with coil wire sizing, slot sizing inside...
  13. The NEC requires that receptacles used for motors...

    The NEC requires that receptacles used for motors must have a HP rating equal to or greater than the motor HP. (430.109)
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    Over (O) Voltage (U is voltage) on Constant Speed...

    Over (O) Voltage (U is voltage) on Constant Speed (C), as opposed to A (Acceleration) or D (Deceleration). It just means you got an Over Voltage condition while you were not accelerating or...
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    OK, NOW we are at the meat of it... You are...

    OK, NOW we are at the meat of it...

    You are correct on your choices, but you left one out; use a 3HP 2 pole (3600RPM) motor to begin with. You seem hell bent on using a 4 pole 1800 RPM motor and...
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    Momentary switches are intended to work with...

    Momentary switches are intended to work with things like motor starters that can have a "seal-in" contact that keeps the coil energized after you let go of the button. The standard setup for a VFD is...
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    50Hz... that means it's either built as a...

    50Hz... that means it's either built as a Brazilian motor (they use 440V 50Hz), or it was meant as a European motor for 220/380V 50Hz, which would work fine for 460V 60Hz, but NOT for 230V 60Hz...
  18. Thread: Teco l510 vfd

    by Jraef
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    What is the entire part number of the Teco drive...

    What is the entire part number of the Teco drive that you have? Although a 230V 3 phase version CAN be fed with single phase, it needs de-rating. The versions SOLD as single phase input are already...
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    The concept here is called a "bleeder resistor"...

    The concept here is called a "bleeder resistor" for a capacitor start motor. When you start the motor, the cap is put in the circuit in series with the Start winding briefly to cause the phase shift...
  20. Thread: Teco l510 vfd

    by Jraef
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    1,203

    Where are you in California?

    Where are you in California?
  21. Just so that you know (and for the benefit of...

    Just so that you know (and for the benefit of future readers contemplating the same issue):
    The 120V and 230V drives are identical, except for the fact that the 120V version has an ADDITIONAL set...
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    Standard 3 phase transformer sizes are 20, 25,...

    Standard 3 phase transformer sizes are 20, 25, then 30kVA. I would go with 30kVA to avoid a voltage drop when trying to start it; you typically want your kVA to be 2-2.5x the load for AC motors...
  23. If you vary the speed of the main motor, you will...

    If you vary the speed of the main motor, you will also be varying the speed of the coolant pump. That may or may not be a good thing, you would have to assess that.

    If you are never varying the...
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    One possible suggestion is to take the Bremas...

    One possible suggestion is to take the Bremas part number to a Kraus & Naimer office and see if they can cross it over. K+N were always a bigger supplier than Bremas for cam switches and are still...
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    All IEC devices are made to mount on DIN rail...

    All IEC devices are made to mount on DIN rail only. The "mounting feet" were an afterthought for Americans who insisted on it.


    The rotary switches are designed to have a nameplate installed in...
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