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Thread: 300ss

  1. #1


    Bought a $50 non working 300SS. Took the cover off and blew out as much dust as I could. Looked it over and don't see anything burnt or otherwise unusual looking. Downloaded the operation manual and on page 17 near top right there is a small transformer and card which I don't have. Sheet 23, drawing and parts list, doesn't show the transformer or card nor the part numbers on sheet 22. Can anyone confirm the 300SS does not use these?

    Confirmed bus bars configured for 220V. Plugged in turned on switch and nothing no power indicator and no fan. Measured 251 at input to the capacitor/filter card. Shut down and will start disassembly, any tips?

    Thanks for any help.

  2. #2

    Re: 300ss

    Sorry for the late reply. I've been neglecting this forum lately.

    The drawing on page 17 is for multiple models. The transformer is used for 400-series Fan On Demand models, and the circuit board is used in the 300ST. Your 300SS would not have either of them.

    In the 300SS, the cooling fan also works as a transformer to supply power to the main control board. I suspect your fan is bad. Unfortunately, this fan is obsolete, and I don't know of any alternative. Your best bet is to find another broken $50 PowCon with a good fan, and try to make one good machine out of two.

  3. #3

    Re: 300ss

    Thanks for the reply, been a while for me too. The interior is filthy and there is a fair amount of surface rust/oxidation. On the transformer, voltage selector side, what are the two schematic symbols, look like switches but can't make out the symbol clearly on my copy. Figured I could at least check that the windings are open or not. Thanks again.

  4. #4

    Re: 300ss

    Hi jvan100, sorry it took me so long to reply. Once again, I haven't been on here in a while. I'll try to make a habit of checking in more regularly.

    The symbols you see show where the buss bars should be placed for either 230V or 460V operation. For 230V, there should be one buss bar across the left two posts, and one buss bar across the right two posts. For 460V, both buss bars should be on the middle two posts. There are also two other locations where the voltage is changed.

    As far as measuring the windings, if we number the posts 1-4 from left to right, if you take all the buss bars off, you should measure a winding (low resistance) between posts 1 and 3, and between posts 2 and 4. If one of those pairs measures high resistance, either the winding has "opened up" in the fan, or one of the wires came disconnected from the bottom of the posts. If you measure low resistance between 1 and 2, 3 and 4, 1 and 4, or 2 and 3, then there is a short in the motor.

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