Question about Hobart H600 Stand Mixer

2 Answers

Hobart H600 wont shut off

Hobart H600 runs right away when plugged in. The contactor is not stuck shut but is energized as soon as you plug it in. Person who used it last few times said at first they had to hold in on the start button to make mixer work. Soon as they let go of the start button the mixer shut off. Next, they used a broom stick to keep the start button pushed in while mixing the dough and when done just pulled the stick out to stop the machine. The problem that I have now is that the machine will not shut off unless we unplug it or hold in on the stop button. If we just push in the stop button the mixers contactor opens and mixer will stop only if we keep the stop button pressed in. If we let the stop button go the mixer continues to run. I suspect that the start switch is bad but could sure use some help from someone familiar with this mixer.
Thank You!!!!!

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  • bfrasier Feb 13, 2009

    Since posting my problem last night I have a bit more info that may help those trying to help me. First, this mixer is a 3 phase unit with seperate "start", "stop" buttons and a "timer" located on front of unit. There is a 3 pole contactor and 3 pole heater mounted to rear of the unit inside cover (remote). The contacts in the start and stop switches, as well as, the conacts in the contactor are working normally and not welded shut. The side switch on the contactor is also working normally. Today, I had to unhook the timer because it threw sparks out around adjustment stem. After cutting the leads to the timer motor and unhooking the wires from the timer contacts I was looking at the wiring diagram to see how I could eliminate the timer and discovered that a wire coming off the stop switch was wired to the wrong terminal on the start switch. When I changed the wire to the correct position on the start switch I found that the mixer does not run all the time when plugged in. Now when I plug in the mixer I have to keep the start button pressed in for it to run. When I let go of the start button the contactor opens and mixer shuts off but the motor brake solenoid is not energized. If I hold in on the start button to keep the mixer running and then press the stop button simultaneously, the contactor de-energizes and motor brake solenoid energizes shutting the mixer off normally. The rest of the wiring looks to be correct now but I am unsure of how to wire around the timer. I just capped both leads to the timer motor but am not sure of where to run leads from the othe 3 timer terminals which amounts to a switch with a common terminal and (2) NO contacts. Is there a diagram out there anywhere that I can refer to? We also have 3 other Hobart H600 mixers and all of them use different components and motors so I need to find out about wiring for this model with these components and without a timer. Thanks again for those who are trying to help me along. Your time spent on my problem is greatly appreciated :)

  • bfrasier Feb 13, 2009

    Since posting my problem last night I have a bit more info that may help those trying to help me. First, this mixer is a 3 phase unit with seperate "start", "stop" buttons and a "timer" located on front of unit. There is a 3 pole contactor and 3 pole heater mounted to rear of the unit inside cover (remote). The contacts in the start and stop switches, as well as, the conacts in the contactor are working normally and not welded shut. The side switch on the contactor is also working normally. Today, I had to unhook the timer because it threw sparks out around adjustment stem. After cutting the leads to the timer motor and unhooking the wires from the timer contacts I was looking at the wiring diagram to see how I could eliminate the timer and discovered that a wire coming off the stop switch was wired to the wrong terminal on the start switch. When I changed the wire to the correct position on the start switch I found that the mixer does not run all the time when plugged in. Now when I plug in the mixer I have to keep the start button pressed in for it to run. When I let go of the start button the contactor opens and mixer shuts off but the motor brake solenoid is not energized. If I hold in on the start button to keep the mixer running and then press the stop button simultaneously, the contactor de-energizes and motor brake solenoid energizes shutting the mixer off normally. The rest of the wiring looks to be correct now but I am unsure of how to wire around the timer. I just capped both leads to the timer motor but am not sure of where to run leads from the othe 3 timer terminals which amounts to a switch with a common terminal and (2) NO contacts. Is there a diagram out there anywhere that I can refer to? We also have 3 other Hobart H600 mixers and all of them use different components and motors so I need to find out about wiring for this model with these components and without a timer. Thanks again for those who are trying to help me along. Your time spent on my problem is greatly appreciated :)

  • bfrasier Feb 13, 2009

    Mixer Model # H600

    Serial # 11-279-690

    M L # 19306

    200 volts, 3 ph

    When you say "latching circuit" do you mean like a "hold in" circuit that when the side switch closes it sends power to the contactor to keep it "held in"? Right now the side switch is wired to common and the n.o. set of contacts. If you eliminate the electro mechanical timer from the mixer is it possible to rewire this machine to just use the start and stop buttons. I suspect now that the switch side of the timer created a hold in circuit (for lack of a better or proper term) and since these are unhooked now I have lost what ever circuit would have held in the contactor when the start button was pressed. There is a diagram on this unit but it includes a wiring diagram using this timer so Im not really sure of how to just wire around it properly.

  • bfrasier Feb 14, 2009

    The timer used on this mixer was an electro mechanical timer. It had 2 wires powering the timer motor and 3 wires coming off the switch part of timer. The timer switch had a "common" terminal (#1) and 2 n.o. sets of contacts, #2 and #3. I believe one motor lead was on terminal #3, terminal #2 went back to the side switch on the contactor and terminal #1 went to the start switch. I am not at the same location as the mixer now but am pretty sure that was how it was wired. So far I have been unable to find a correct diagram but am still searching. Thanks so much for your help!

  • bfrasier Feb 15, 2009

    There is a side switch located on the left side of the contactor. The side switch closes everytime the contactor pulls in because there is a metal piece fitted into the side of the contactor that physically pushes the side switch closed everytime the contactor closes. When the contactor is de-energized the contactor opens and the metal piece that pushed in on the side switch springs back and allows the side switch to open. One wire off the top of the side switch went right over to one side of the contactor coil (terminal #C1) where it was hooked to another wire that Im not sure where it ran to. Either the bottom or top wire on the side switch went back to terminal #2 (n.o. switch) on the timer. It is just taped off now since the timer has been unhooked. Im am going to stop back and check the voltage across the side switch tomorrow to make sure it actually closing and opening and will also make a diagram of the control circuit so I can give you a better answer on where things are ran to. Does the side switch create a hold in circuit when the start switch is pressed, and then hold in is circuit is opened by pressing the stop button? If I better knew what the job of the side switch was I might have a better idea of how it should work in the control circuit. Please remember that I had to unhook timer because the timer motor was out and terminal #1 (common) on the timer switch fell out. Im sure that the leads that went to the timer switch (#1 common, #2 n.o., #3 n.o) have a lot to do with why it isnt running right now but Im not sure how to wire around the timer altogether. Again I thank you so much for the time you have given and will let you know tomorrow how the side switch is wired in and if the switch is actually opening and closing.

  • bfrasier Feb 19, 2009

    problem was in the latching circuit made by the side switch on contactor. Was able to eliminate the timer and rewire around the timer switch using the side switch to hold circuit in. THANK YOU to all who spent time on my problem and help me better understand the componets inteneded use. Mixer is now working very well!!!!!!!!!

  • Mark Egan May 11, 2010

    How many wires connect from the timer to the control circuit? 3, or 4?

    Is the timer a spring wound type, or powered type?

    At least 2 of the wires connect to the timer switch. One of those 2 may also connect to the timer motor, unless it is a spring wound timer.

    I've looked for a copy of the wiring diagram, but have not found yet. If you have found one on the Internet, please send the link.


  • Mark Egan May 11, 2010

    Is this a 1 or 3 phase powered unit?

    Is there both a start-stop switch and contactor/starter in one box, or a start-stop switch and remote mounted contactor/starter?


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  • 1,214 Answers

Sounds like the side switch is the latching switch for the circuit, and you are right about it's operation. I strongly suspect where the wire comes off that slide switch and goes to the coil, there would be 2 wires at that connection, where the other one leads to one side of the start switch.

Looking forward to your reply. It will be easier to email the schematic that you come up with to me. Be sure and tell the the starter manufacturer that is installed as well.

stewartswitch@yahoo.com

Posted on Feb 15, 2009

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  • Master
  • 640 Answers

Sounds to me like the start switch contacts are welded shut.If you have a multimeter set it to ohms,remove 1 wire from the switch,put your meter leads across the switch and if you get a reading that switch is bad.If you dont get a reading i would check the side switch on the contactor.Im a hobartt tech and repair these mixers alot.Let me know.

Posted on Feb 12, 2009

  • 1 more comment 
  • anthony james
    anthony james Feb 13, 2009

    The latching circuit is not working and this is were the side switch on the contactor comes into play---you should have wires on the side switch as follows---1 on common,1 on n.o. (normally open).I'll post later with a diagram.I need a m.l. # located on the data plate.

  • anthony james
    anthony james Feb 14, 2009

    Before we get into the wiring diagram,if you look at the contactor when the mixer is running can you see that the side switch contacts close? Is a side switch on the contactor?If you cant see it close then well step through the diagram,if you see it closes then theres another issue.Can you take a voltage reading on the side switch with a meter?If so put your meter on ac volts and 1 lead on the common side and the other lead on the n.o. side.Turn the mixer on (get someone to hold in the start switch) and if you read any volts the side switch is bad.

  • anthony james
    anthony james Feb 15, 2009

    Yes the side switch on the contactor is the latching (holding) switch for the circuit.I'll wait for your reply.Do you want to bypass the timer all together?

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