DC motor field windings

By your calculations you wrote" I know that hooking them up for 500VDC in series and in parallel for 150VDC ."

If this is the case you wrote "I wired the field in series" your motor is running at less than 1/2 load and coping well or you have connected them correctly as per your original configuration.

Hello , I realized the difference days after I reinstalled the motor. But never the less it is running just fine I was just wondering if there is any potential possibility of damage to the motor by leaving it wired this way. I don't think I am understanding your question Sir? When the motor died I tested the winding, armature, pulled every brush etc... I then found with my Multi-meter a suspected fault in the field windings and verifid those findings my Megger. I could swear I wrote down the original wiring config but like I said this motor hasn't been touch in over 20 years till it started blowing field fuses in the SSD drive. So I revert to my original question of " will leaving the field wiring in the 500Vdc configuration will it hurt either the motor or the drive???". I believe the SSD is operating in 2 quadrant rather than 4 quadrant and was wondering if that has any spot in this equation of wiring vs damage ? Hope this helps Thank you

If your field voltage supply is 141 and you are connected for 500V you would loose a lot of power. However you say it is working ok so maybe what you think you have done is not actually what you have done! Windings set for 500V cant come to grief on 141V,if it is working ok then I suspect you have rewired it as per original or your motor is not doing much work.

Thanks for everyones help on this minor subject matter, but after carfeful consideration of the available data and watching the machine under load with the operator today I have decided to " Let a sleeping dog lie" , I believe that the reason it was wired in series for a low voltage supply was that the rated tourque at the proper wiring squence would have or have the potential to rip the wire out of the machine quicker than the draw machine could produce, therfore by connecting the motor to a low voltage drive via the high voltage field diagram all you really do is create a field weakening situation and reduce available torque, so as the machine increases or decreases production all you must do is adjust the TUR speed accordingly