2 post auto lift - 220v wiring
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  1. #1
    Join Date
    Mar 2007
    Location
    North Alabama
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    22

    2 post auto lift - 220v wiring

    I have a 2 post auto lift. On the motor plate it says: 3hp 220v 20 amps.
    There is also a safety shut off switch on top if the car gets raise too high.
    The wires for the safety switch run down the column to where the motor is.
    The motor has a switch housing with 3 wires coming out the housing. Green, Red, and Tan.
    On the face of the housing is the push button. It is connected to the switch inside with 2 blue wires.

    To connect the safety switch, I'm told to spice into any one of the blue wires from
    the push button going into the main switch.

    Questions:
    Should I use a 20amp 220v breaker or go up to a 30 amp.
    If I go to a 30 amp. Should I go up to 10 AWG, or can I still use the 12 AWG.

    The tan motor wire used as ground seems odd. I'm used to seeing green for ground.
    The green and red wires are on one side of the switch. The other side has two wires going to the motor.
    Do I just connect the tan to bare wire/ground buss, and the red and green just go to black
    and white (re-marked black) to the breaker?

    Thanks

  2. #2
    Join Date
    May 2006
    Posts
    4,157

    Re: 2 post auto lift - 220v wiring

    Personally, I'm using 10AWG and a 30 amp breaker for mine. Bendpak - 10k lift w/ asymetrical arms.

    I believe normally green is std. ground. I'll check. What lift do you have?
    John
    - fabricator extraordinaire, car nut!
    - bleeding Miller blue!

    http://www.weldfabzone.com


  3. #3
    Join Date
    Mar 2007
    Location
    North Alabama
    Posts
    22

    Re: 2 post auto lift - 220v wiring

    Thanks! America's Pride. 10,000 lbs.

    http://www.americasprideonline.com/2...1-.ViewProduct

    The instructions that came with it aren't too good. They mention a Black,'
    Brown, and Blue wire from the motor which isn't so.

  4. #4
    Join Date
    Sep 2006
    Location
    NJ, USA
    Posts
    3,357

    Re: 2 post auto lift - 220v wiring

    In US areas, green or bare -IS- the ground wire.

    IIRC, 'internal' wiring in a device may use any color wires however they want, but for the 'accessable' parts of the wiring (the wires you or someone else would connect to the premises wires or where you would wire up a cord, etc, etc, etc) the standard wire colors are supposed/required to be used.

    Next, if the nameplate is 20A at 220V, then the usual minimum breaker would be a 25A breaker. Check the manual for the call out for the breaker and the wiring needed/recommended.

    John's use of a 30A breaker and 10AWG wire is just fine for equipment with a nameplate rating of 20A.
    Last edited by MoonRise; 01-07-2008 at 02:48 PM.

  5. #5
    Join Date
    Mar 2007
    Location
    North Alabama
    Posts
    22

    Re: 2 post auto lift - 220v wiring

    Hi MicroZone:
    Did you run your wire on the inside or outside of the column?
    I'm planning on the outside in conduit.
    Thanks Again.

  6. #6
    Join Date
    May 2006
    Posts
    4,157

    Re: 2 post auto lift - 220v wiring

    Yes - outside. You're most welcome!
    John
    - fabricator extraordinaire, car nut!
    - bleeding Miller blue!

    http://www.weldfabzone.com


  7. #7
    Join Date
    Mar 2007
    Location
    North Alabama
    Posts
    22

    Re: 2 post auto lift - 220v wiring

    a little more info...

    inside the switch box housing, the 2 wires from the motor
    go to the top of the switch. One goes to 4 T2, and the other goes
    to 6 T3.

    The wires I have to connect to come off the
    top of the switch as 3 L3 and 5 L3. I'm thinking these
    get connected to the black and white (remarked black)
    to the 220v breaker.

    The tan wire I have to connect to comes off the motor housing.
    This I figure has to be the ground

    2 blue wires coming from the bottom of the switch goes
    to the push button. I think I have to spice the safety cut
    off switch into one of these wires. The cut off switch is on
    top of the lift and gets actuated if a car is raised to high.

    Will go to 10awg and 30 amp breaker.

    Hope some one can tell me if my thinking is correct or not.
    Thanks in advance.

  8. #8
    Join Date
    May 2006
    Posts
    4,157

    Re: 2 post auto lift - 220v wiring

    Scot - I'm not familiar with that model.

    Whoa - don't splice anything! Do you have the instructions? My first stop would be to call the company. Even if you bought it used, you can usually call the company and they will walk you through a simple issue.

    Give it a shot. Maybe Moonrise can respond as well.
    John
    - fabricator extraordinaire, car nut!
    - bleeding Miller blue!

    http://www.weldfabzone.com


  9. #9
    Join Date
    Nov 2006
    Posts
    5,711

    Re: 2 post auto lift - 220v wiring

    I thought about the wiring, but sorry, no comprende.

    I wonder: Is it direct wired, or a control circuit? Are they single or double pole switches? The push buttons?

    A sketch or picture might help a lot. Micro's right, best if you could find OE diagram.

    Good Luck

  10. #10
    Join Date
    Jul 2007
    Location
    Cape Cod MA
    Posts
    1,082

    Re: 2 post auto lift - 220v wiring

    Stop!!!

    I would not connect anything yet.

    What is the switch you have for the high limit of the lift? Voltage and HP rating...

    There are a lot of ways manufactures can "wire" a power pack like that without looking at it is hart to give you good (correct) advice. So give us some pictures!

    You also need to make sure the limit switch only stops the motor going in the UP direction, or you will have big problem when you trip it and can't get a car up OR down!

    Give us some pictures of everything... That way we can tell you what is going on.
    Me!

  11. #11
    Join Date
    Nov 2006
    Posts
    5,711

    Re: 2 post auto lift - 220v wiring

    Hey Scot Clark, I read your posts again, and looked at the instructions you linked to. This won't be so tough, you're close.

    You need to solve several separate issues, one at a time, you can knock them out.

    Overhead safety switch: The overhead switch is an option that you need. Looks like you had that correct at post #1. Cut either one of the blue wires at the push button. The cut gives you two open leads; Connect any one of these leads to any one of the overhead switch wires. Connect the remaining lead to the remaining overhead switch wire.

    Motor wiring:
    How many motor wires, total, exit the motor and enter the terminal box?
    What voltage(s) does the motor data plate show?

    Switch wiring:
    Does the switch look similar to a common light switch?
    How many terminals on the switch?
    Are any of the terminals carrying more than one wire?

    Green and Brown:The green wire that is on the switch now, is it just a "pigtail" lead and not connected to anything else? Except for color, does the green lead look identical to, and interchangeable with, the brown lead which is now connected as motor ground?

    Keep at it!
    Last edited by denrep; 01-08-2008 at 10:54 PM.

  12. #12
    Join Date
    Nov 2006
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    5,711

    Re: 2 post auto lift - 220v wiring

    Quote Originally Posted by Scot Clark
    a little more info...

    inside the switch box housing, the 2 wires from the motor
    go to the top of the switch. One goes to 4 T2, and the other goes
    to 6 T3.

    The wires I have to connect to come off the
    top of the switch as 3 L3 and 5 L3.
    Did you maybe intend to type "L2 and L3" rather than "3 L3 and 5 L3"

  13. #13
    Join Date
    Mar 2007
    Location
    North Alabama
    Posts
    22

    Re: 2 post auto lift - 220v wiring

    Hi Denrep and all:
    Thanks for replies.
    I'll check again, I think it is L2 rather than L3.

    "Overhead safety switch" OK, that sounds solved. Thanks!

    "How many motor wires, total, exit the motor and enter the terminal box?"

    2 yellow wires from motor go to the top left of the switch T2 and T3.
    Then on the right side of the top of the switch are the leads left for
    me to connect to thinking L2 and I know L3 . On the right side bottom of the switch are the blue 2 wires that connect the push button.

    "What voltage(s) does the motor data plate show?"
    Plate on motor says 220v, 3hp, 20 Amps.

    Switch wiring:
    "Does the switch look similar to a common light switch?"
    No, not at all. Looks almost like a big relay.

    "How many terminals on the switch?"
    from memory... looks like about 4 terminals on top right side and 4 terminals
    on top left side. The switch is pre-wired to the motor and also a short
    lenght of wire they left for me to connect to as mentioned above.

    "Are any of the terminals carrying more than one wire?"
    from memory, I'm pretty sure no, I don't think so.

    "Green and Brown:The green wire that is on the switch now, is it just a "pigtail" lead and not connected to anything else? "

    The pigtail they left me to connect too has Green and Red coming off the top left side of the switch. Also in that pigtail is the tan that is connected
    to the motor housing.

    "Except for color, does the green lead look identical to, and interchangeable with, the brown lead which is now connected as motor ground?"
    It looks to be the same size wire but the one connected to the motor looks
    like it has a lug on it.

    Thanks Again !!!!

  14. #14
    Join Date
    Sep 2006
    Location
    NJ, USA
    Posts
    3,357

    Re: 2 post auto lift - 220v wiring

    Scot,

    If you are not sure, your best bet is to call the company. For all you know, we're all just some pets who got access to the computer while the people are off at work. Afterall, olddad -is- a gorilla.

    Next, this is a lift for your hobby use or is this for a business?

    If for a business, STOP! You have to get a licensed electrician to wire it up. Product liability, commercial usage, etc, etc, etc. If the electrician can't figure out the schematic or wiring instructions, he'll call the manufacturer.

    If this is for your hobby usage, do what the electrician would do and call the company. Ask them why the the motor ground wire is tan in violation of NEC color-coding requirements that GREEN (or bare) is used for ground wires.

  15. #15
    Join Date
    Nov 2006
    Posts
    5,711

    Re: 2 post auto lift - 220v wiring

    Hey, Scot Clark,

    You can try to call the manufacturer. You'll probably be greeted by a tech support person with some narrow canned answers.

    If it was mine, and I was not satisfied with those suggestions; I would do this:
    With another look, confirm that your memory is correct, if so; forget colors for now, I would wire up for a test run. I base this on your observations, and the wiring instructions at the AP link. However, I am sure enough to offer my customary guarantee to eat any mistake; in this case limited to the contactor!

    The basics of this circuit is to energize a hydraulic pump motor, through a magnetic contactor, by connecting two motor leads to two line leads. Hoist is lowered through a manual hydraulic valve; a non-electric function.

    When push button and overhead switch are both closed; the contactor coil is energized, closing the contactor. When the contactor closes, motor leads at T2 and T3, will connect to line at L2 and L3, energizing the pump motor.

    So, I would:
    Connect the motor frame ground lead, to the ground conductor.
    Connect a line lead to L2.
    Connect the remaining line lead to L3.
    Disregard neutral, it is not used.
    After a test run, wire color issues can be addressed.

    Be extra cautious on initial test of any electric circuit. Use a push stick to just barely and momentarily close the push button, always beware of contact arcing or motor stalling.

    I would consider this unnecessary here, but sometimes I test wire with short leads. I connect to the line with just a few strands of wire; this ads a fuse of sorts, for an initial test or jog.

    Good Luck

  16. #16
    Join Date
    Mar 2007
    Location
    North Alabama
    Posts
    22

    Re: 2 post auto lift - 220v wiring

    Denrep:

    You nailed it above! It works great. Thanks All for the replies !

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