Compressor electric motor issue

Discussion in 'General Electronics Chat' started by hybrid999, Nov 11, 2009.

  1. hybrid999

    Thread Starter New Member

    Nov 11, 2009
    3
    0
    I will try to give all the info possible.

    motor:
    5 hp
    23 fl amp
    208 - 230 V
    three "butt" connectors at the motor (red, black and blue)
    which one should I use ?

    It`s starting up for 3-4 seconds and right after that it trips the 30 amp breaker.
    It`s on his own circuit (alone) with 10-2 nmd90 wire(90 feet long) with a 30 amp breaker.

    any idea what it could be ? I tried everything...

    thanks
     
  2. Externet

    AAC Fanatic!

    Nov 29, 2005
    758
    57
    Did you try three-phase power instead ? What does the plate says ?
     
  3. hybrid999

    Thread Starter New Member

    Nov 11, 2009
    3
    0
    it says nothing about three phase...

    Here is the complete label :
    Code ( (Unknown Language)):
    1.  
    2. Laplante
    3. compressor duty motor
    4.  
    5. HP: 5
    6. RPM: 3450
    7. PH: 1     Hz:60
    8. Volt : 208-230
    9. AMB: 40¤C
    10. FR: 56
    11. ENCL: ODP
    12.  
    13. P/N: 240004
    14. DUTY: CONT.
    15. SF: 1.0
    16. CODE: L
    17. INS. CL.: B
    18. FL AMP: 23-22
    19.  
    20. C Line1
    21. H line 2
    22.  
    thanks for you help
     
  4. Externet

    AAC Fanatic!

    Nov 29, 2005
    758
    57
    OK. It is not a three phase motor. Same type of motor and rpm I had in my diving compressor... Check if one of the 3 leads has continuity to its case.

    Does it have a ~6" x ~5" x ~3" metal housing attached to it, where the connections enter ? -Like this : http://www.electricmotorwholesale.com/index.cfm?fuseaction=catalog.catalog&categoryID=1
    Is there capacitors wired in it ? Perhaps there is a wiring instructions label under that cover ? Did it run before as is or you just got it like that?

    I would say the 220VAC power should be connected to the two wires that are not body ground. "Should" be red and black. Cannot find much about that motor on the web. :(

    Ask their technical support:
    technical@laplantecompressor.com
     
    Last edited: Nov 12, 2009
  5. hybrid999

    Thread Starter New Member

    Nov 11, 2009
    3
    0
    the wiring compartment is built-in the motor ... no housing
    the capacitors are on top like the one in the link. But no wiring diagram
    I e-mailed them and it came back saying the address wasn't valid.
    I went back to the store and they ordered a new motor for me (just bought that compressor brand new)

    Will keep you posted on what happens with the new motor...
     
  6. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    typically, your start winding is T5(black) to T8(red). Your run winding single voltage is T1(blue) to T4(yellow). In your case, the T4 may be internally connected to the start winding, allowing you to reconfigure the provided leads for forward/reverse.

    Your best tool is a clamp on ammeter to measure how close you are to FLA.
     
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