Previously hard wired. How do I connect a power cord?

One needs to know what the voltage and phase(1 or 3) the unit is and what the power supply is.

Having 9 wires means it is a 3 phase motor.
For 220 to 240 Volts - L1, T1 and T7 go together. L2, T2 and T8 go together. L3, T3 and T9 go together. T4, T5 and T6 go together.

For 440 to 480 Volts - L1 and T1 go together. L2 and T2 go together. L3 and T3 go together. T4 and T7 go together. T5 and T8 go together. T6 and T9 go together.

You really need to get a Multi meter and follow the power, you have replaced the phase board so we can probably discount it being that.
First check that the switch contacts behind the black control board are really touching when you move the speed control lever to turn the mixer on.
Next the cable, do you have continuity from the wall plug to the control board on phase & neutral, (Check green earth wire as well for the sake of safety) that will be the black wire and the white wire on the 2 lower plug in contacts on the black control board at the back.
Next remove the carbon brushes, do they have reasonable length and most importantly are they fitted correctly with the corner key aligned with the blocker at the bottom of the brush holder.
Next with brushes out check for field winding continuity. On the other side of that black control board to where the power comes in there will be a red wire and a white wire that disappear into the motor housing. One of the wires will have a circuit to one of the brass brush holders and the other wire will have a circuit to the other brush holder. The resistance of both of those circuits should be pretty much identical.
After you have done those tests you should begin to have a clue as to where the problem lies.

Sounds like the polarity. Easily corrected by swapping the red and black position of the wires inside the plug. Make sure there are no other power sources feeding the unit before removing the plug.(the white and green wires should not be moved. Easy way to remember wiring a three phase plug. Most are labeled on the inside of the plug with GXYZ. G is always the green ground wire. X-red (Indians were here first), Y- white ( then came the white man) Z- black ( then the black man)

These must be 3 phase mixers (electrically there are two choices, single and three phase) Three phase cables typically have 4 wires, black, white, red and green (green is ground of course) To reverse the rotation of your mixers you would have to swap two of the three colors, and it doesn't matter which two of the three you choose, DO NOT SWAP THE GREEN, LEAVE IT ALONE. for example, just change red and black wires where it they connect to the plug. Of course turn off the power, unplug the the mixer, and usually you can take the plug apart and reverse the wires. If your units are hardwired you should call an electrician in to do it, it will only take a couple of minutes.

Hi there, If you can give me a little more information, I'd appreciate it. However, I'm going to give it my best shot to see if I can answer what I believe you're looking for. If you're talking about the outlet (receptacle) that you're plugging your appliance into, then the ground (green) wire, or screw on the bottom of the outlet is where you want to connect your third (ground) wire to. If you just have two wires coming off your outlet (receptacle) and can't find the third wire. Then you'd ground or connect a wire to the inside of the box, and then tie with the ground (green) wire coming from the green ground screw on the outlet (receptacle). The problem with house wiring is, a majority of your older houses outlets aren't grounded. If you have a 3-prong outlet, then maybe yours is. But sometimes, people just change these out for convenience purposes. And lastly, if you're talking about the grounded wire in your appliance - look for a green (ground) screw, otherwise you want to connect this to (or around) a metal screw on the inner frame. A majority of your old appliances were never grounded. So bottom line is; your appliance should work with, or without your ground wire. It would be preferable if it was grounded. But for operating purposes, its not. I hope I was able to answer your question for you. If not, feel free to contact me again. Good Luck, Jim

Sounds like you have solved it already, the phase boards are worth stuff all so buy one and throw it in. It's unlikely to be much else as you have proved the motor runs.

Hi, this is a very simple process. I don't know if the cord is a 2 prong or 3 with the ground, but it makes no difference. You should have screws around the perimeter of the mixer that you need to take loose to separate the half's. I am assuming the cord is built into the mixer, if not please correct me. The end of the cord will be connected to the on/off control, may it be a trigger type or slide or what ever it has. You will have either a black wire which is hot, connected to the switch so the switch can break the connection to turn the mixer on and off. The other wire may be white which is neutral connected to another wire in the mixer, you will see this. If it has a ground, 3 prong, it will be green and will show you where it connects. If it is just 2 prongs, the 2 wires may both be black and in this case you can connect them to either wire they are showing you. I don't believe the connections are soldered, they may be screw connections or wire nut connector's. If it would be easier for you, take the mixer with you to your hardware store such as Home Depot as they have many different cords to choose from, and you will get help in the electrical section to make sure you have all you need. Just take your time and put the wires back in the same way as the old cord was wired. If the cord is a detachable cord, take it with you and match it with one that has the same connections and 120 volts. You do not have to buy a Black and Decker cord to do this. There are many cords that will do the job just as good if not better. Keep me posted if you need my help.
Sincerely,
Shastalaker7

It sounds like you need a new speed control phase board:
http://kitchenaidmixerspares.co.uk/SearchResults/tabid/37/Default.aspx?Search=phase

it requires 3 phase with ground it is a four wire system