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  1. 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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    1,454

    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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    974

    I woorked for K-M for 6 years, I can attest to...

    I woorked for K-M for 6 years, I can attest to the fact that EVERY detail of the assembly was thoroughly "rationalized" (their wording) for simplicity, repeatability and durability, within the design...
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    That is usually something that you can select in...

    That is usually something that you can select in programming; what you want it to do in the case of an overload and/or stall condition. Your choices are often Trip, which is usually the factory...
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    Replacing an old obsolete contactor made by a...

    Replacing an old obsolete contactor made by a company that has not existed for 20+ years with another one just like it is just asking for trouble in my opinion. Just get a new contactor from a...
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    Yes, that sounds like it is a 7-1/2HP 230V single...

    Yes, that sounds like it is a 7-1/2HP 230V single phase motor then. The NEC chart then says 40A, so the wire must be 125% of that value, so 50A minimum; #6 still works, 60A breaker still works.
    ...
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    1,628

    I'll call BS, but only for this reason;...

    I'll call BS, but only for this reason; "Marketing HP", something the compressor industry is actually infamous for.

    HP to the rest of the world (that uses HP) is a finite definable value of...
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    603

    Unfortunately on the old FM50s, there was no "3...

    Unfortunately on the old FM50s, there was no "3 wire control" mode, meaning a momentary Start and Stop button. It needs a maintained contact closure on the FWD terminal to run. The only way to...
  10. The VFD is likely going into Current Limit, which...

    The VFD is likely going into Current Limit, which functions by overriding the commanded speed in an attempt to shed load in order to keep current down. In your case, current is going high...
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    Teco, Delta (Automation Direct) and Hitachi are...

    Teco, Delta (Automation Direct) and Hitachi are popular low-cost brands used by a lot of people here, quality is decent, feature set is maybe a little lacking on the low-end models, but you likely...
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    Something is wrong here. 7.5HP 230V is 22A, the...

    Something is wrong here. 7.5HP 230V is 22A, the 160 only went up to 18A (5HP). If it's a .75HP (3/4HP) drive, not 7.5HP, and you are trying to run a 3HP motor with it, it is going into current limit...
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    Do you have the manual for that old VFD? If so,...

    Do you have the manual for that old VFD? If so, look for any mention of a "Phase Loss" trip, and if it has that, can it be defeated or ignored. If it has Phase Loss trip and there is no way to defeat...
  14. Thread: cosφ

    by Jraef
    Replies
    4
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    581

    That’s the European way of saying “Power Factor”....

    That’s the European way of saying “Power Factor”. Most motors here don’t show that, just use .8. It’s not that important to the drive.
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    What they are using is called a "Written Pole"...

    What they are using is called a "Written Pole" motor design. In a nutshell, the rotor has permanent magnets and as such, "creates" the 3rd phase, then uses it. These motors are VERY expensive and...
  16. Thread: 250W weak motor?

    by Jraef
    Replies
    7
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    877

    250W at 1400RPM comes to 1.7 N-m of torque (or...

    250W at 1400RPM comes to 1.7 N-m of torque (or for us, 15 in.-lbs.). That is roughly what it takes to open a typical jar of pickles (or maybe in your case, Giardiniera). You have a very small motor,...
  17. Thread: Relay Repair

    by Jraef
    Replies
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    1,796

    Electromechanical relays have two “lifespans”, an...

    Electromechanical relays have two “lifespans”, an electrical lifespan of the contacts and a mechanical lifespan of the moving parts. Typical values to which devices like MTRs were made would be 1...
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    Assuming you are measuring the 247V without a...

    Assuming you are measuring the 247V without a load. Connect The compressor and measure the voltage with the motor running, you might find that it drops enough to to be within the +10% tolerance. If...
  19. Not sure what you are referring to here.

    Not sure what you are referring to here.
  20. Increasing the carrier frequency above 10kHz...

    Increasing the carrier frequency above 10kHz moves the high pitched whine from the motor out of the range of typical human hearing (but your dog may not want to hang out in the shop). If you are...
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    All the right advice. I'll just add that the...

    All the right advice. I'll just add that the first simple step I would take would be to disconnect the motor and try to run the drive with no load connected. If you still get an OC-A fault, it's the...
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    1) The FM 50 has been out of production for...

    1) The FM 50 has been out of production for almost 10 years now.
    2) TECO is Taiwan Electric Co. Taiwan is NOT the same as mainland China. In fact if you refer to them as "China", they get upset.
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    Was the drive brand new when he bought it? If...

    Was the drive brand new when he bought it? If not, ALWAYS go through and do a reset to factory defaults, you have to get rid of all previous programming or you end up chasing your tail forever. If...
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    Variacs USED TO be cheap, then all of the wannabe...

    Variacs USED TO be cheap, then all of the wannabe guitar heroes found out about using them on the amps to get certain effects and all of a sudden, the prices on used ones skyrocketed, at least from a...
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    That Leviton toggle switch IS rated for HP, but...

    That Leviton toggle switch IS rated for HP, but it's 2HP at 240V. You have a 5HP motor. No good...
    https://www.leviton.com/en/products/3032-2i

    That's why I said you CANNOT go by amps alone....
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