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Thread: measuring blower motor current

  1. #31
    DIY Junior Member leeelson's Avatar
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    Quote Originally Posted by DonL View Post
    Here is the scoop,

    Item Belt Drive Motor
    Motor Type Split-Phase
    HP 1/2
    Nameplate RPM 1725
    Voltage 115/208-230
    Frame 48Z
    Enclosure Open Dripproof
    Mounting Cradle
    Hz 60
    Full Load Amps 7.6/3.7-3.8
    Thermal Protection Auto
    Insulation Class F
    Service Factor 1.25
    Bearings Ball
    Max. Ambient Temp. 40 Degrees C
    Rotation CW/CCW
    Shaft Dia. 1/2"
    Shaft Length 1-7/8"
    Body Dia. 5-5/8"
    Duty Continuous
    RPM Range 1400-1800
    Phase 1


    Nice Motor.
    Dumb question:
    What does "Full Load Amps 7.6/3.7-3.8" mean?
    Does it draw 7.6 on startup, then 3.7-3.8?

  2. #32
    DIY Junior Member leeelson's Avatar
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    Quote Originally Posted by DonL View Post
    I bought these and gave them out at work in the electronics lab.

    They work very good for the money.

    http://www.mcmelectronics.com/product/72-7218

    But you know some people like to spend big bucks, thinking higher price is better, or safer.

    The fact is most are made in China, and they don't drop test their meters.


    And I do not drop test mine either.


    Have a great day.
    Another question for you pro's:

    I'm trying to find a good, cheap clamp meter. How important is it to read DC current? I have a solar PV installation.

  3. #33
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by leeelson View Post
    Another question for you pro's:

    I'm trying to find a good, cheap clamp meter. How important is it to read DC current? I have a solar PV installation.


    Many VOMs will measure AC and DC Current up to 20 amps. And you hook it in series with the load.

    AC clamp meters can measure without disconnecting the wiring.

    "What does "Full Load Amps 7.6/3.7-3.8" mean?" --- That is the 120 and 240 Volt rating.

    FLA is the Max power the motor will pull under full load when running.

    Start current will be a bit higher, until the motor comes up to speed.


    Have Fun.
    Last edited by DonL; 09-15-2013 at 03:18 PM.
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  4. #34
    Electrician ActionDave's Avatar
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    Quote Originally Posted by leeelson View Post
    Dumb question:
    What does "Full Load Amps 7.6/3.7-3.8" mean?
    Does it draw 7.6 on startup, then 3.7-3.8?
    The motor is able to be connected to multiple voltages, 120, 240, 208. If the motor is connected to a higher voltage the amperage is lower; watts stay the same.

  5. #35
    Electrical Contractor/Instructor jwelectric's Avatar
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    Quote Originally Posted by leeelson View Post
    Dumb question:
    What does "Full Load Amps 7.6/3.7-3.8" mean?
    Does it draw 7.6 on startup, then 3.7-3.8?
    7.6 amps at 115 volts
    3.7 amps at 208 volts
    3.8 amps at 230 volts
    Last edited by jwelectric; 09-16-2013 at 05:41 AM. Reason: typo

  6. #36
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by jwelectric View Post
    7.6 amps at 115 volts
    3.7 amps at 208 volts
    3.8 amps at 230 volts

    Not to confuse things, but the current should be less for 230 than 208.

    If theory works.
    Theory only works perfect in a vacuum.

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