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Thread: evap fan motor

  1. #14
    Join Date
    Dec 2012
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    columbus, OH
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    Quote Originally Posted by garyed View Post
    I've been in the field for over 30 years and I've never seen the opposite effect on a running system with a PSC motor. Were you checking the amps both ways or were you reading the amps off the tag and measuring them against your measured amp draw? There might be some other scenarios but that's the only case I can think of where your amps might measure lower with the door off.
    Yes I was checking amps with door off and then on. With the door off i got about .3 or .2 amps less. If my meter wasnt at work ide check my blower now.

  2. #15
    Join Date
    Dec 2012
    Location
    columbus, OH
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    2,020

    evap fan motor

    Quote Originally Posted by mgenius33 View Post
    An ECM or X13 motor will have the opposite effect.
    As, Gary said, I've never seen a PSC go up when the door was removed.
    It didnt go up. Amps went down slightly with the door off.

  3. #16
    Join Date
    Sep 2008
    Location
    VA
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    1,746
    Quote Originally Posted by Core_d View Post
    It didnt go up. Amps went down slightly with the door off.
    Whoops, sorry post #13 was a typo.

    I have a 115v 1/6 hp 2.5A blower assembly on the bench wide open.
    Input voltage 121.0 vac

    Keep in mind, I can't read run winding separately because it is connected internally to cap common.

    With 0 static, the current goes up to
    4.7A to common L2
    0.4A on start wire
    Capacitor voltage 189v

    Completely closing off the open wheel return side (not motor side), and ~70% of the supply side, the current dropped to near full load
    2.4A common L2
    0.7A start
    Cap volts 313v

    Closing supply side ~99% with return side still closed, the current drops to
    1.6A common L2
    0.8A start
    Cap volts 349v
    "The only true wisdom is in knowing you know nothing" Socrates

  4. #17
    The more air the fan moves, or work it does, the more amps it draws. When they rate a motor it is under a specified load. It would be my guess that, getting back to the original post, the motor is not being loaded to its perfect world load to draw the nameplate amperage. Cap is fine, doesn't need replacement.

  5. #18
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,020
    Just tested my blower 5.7A with door on. 5.88A with the door off. Dont know what the deal was when I tried this before maybe I did something wrong not sure.

  6. #19
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,145
    High static will cause low amp draw. The actual amps will depend in the work being done.

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