Well, I removed the two wires to the reversing rotary switch and it made no difference. Clearly, power is being applied to the variable-speed drive-motor independently of the position of the rotary speed-switch and independently of the position of the spindle fast/slow lever. The reversing contactor and overload relay seem fine as does all the wiring. As soon as power is applied to the machine the variable-speed drive-motor that runs the jack screw all the way to high speed, as though the 240 volt wiring was reversed, which it is not. I am wondering if there is a way to further diagnose this by disconnecting the control wires to either the reversing contactor or some similar action. I have what appears to be an accurate wiring diagram (original to the machine) but it is not clear the position of these relays (normally open vs closed). The other action I could take is to disconnect the power to the control circuits that comes off of the spindle speed control. If I understand correctly, the spindle speed control must be in low or high speed for poser to be applied to the control circuits (wire #10). Any thoughts would be appreciated.
Thanks