Hi Chris,

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I have an odd interest in Felder electrical schematics. The one you shared is very intriguing. I do not have exposure to older Felder schematics, so this one is new to me. More on this later, but I would follow Rod¡¯s direction to identify the 2 lines connected to the transformer. I checked Rod¡¯s suggestion against one schematic and it looks good. Basically, the way machine is wired only one pair will measure resistance, which is the resistance of the transformer input winding. A measurement on the 2 other pairings should be high resistance as you are measuring an open. If you measure resistance on more than 1 pair then I would not use this method. In that case, there are slightly more involved methods that could be utilized. BTW, I did not follow Rod¡¯s step 6, I think there is a word missing but I understand the concept, hopefully you do too.

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Now back to your schematic. Your machine uses a PCB mounted solution. I have seen pictures of a larger PCB in an older KF700 but this one is rather small. It is from Siemens and PN is C98 451-D6094-A1. It is obsolete but I found a German site that apparently offers repaired units.

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Read on if further details are of interest to you. There are 3 images on the site but one below is good for illustration. I have attached a marked up drawing of this board, identifying few components and transferring signal types to the connectors for ease in locating them.

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The 24 VAC transformer is on bottom left. Based upon other Felder schematics that I have looked at, here is what I believe are some key components. K1 and K4 (tall black blocks with white covers) are relays. Typically one is start relay that turns on momentarily and then drops off, the 2^nd one is latched and drops off with red button or any interlock. 3 brick red coils (with a wire going thru the middle) are for current sensing, assuming for braking function. Two white blocks, identified on mark up as S1 & S2, are likely for adjusting brake force and duration.

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Imran Malik

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