I sketched the diagram and created a PDF file, but I am unable or incapable of attaching the file to this email message. Any way, there's no mistaking the primary resistor.
Thank you so much for the cross talk!
Thank you for reply. A little more history is probably needed. The primary resistor is located after the feeder breaker and before the thyristors. Since the resistors are rather larger and give off a lot of heat they are located external to the drive. The Thyristor Drive was manufactured by...
What is the purpose of a primary resistor ahead of the thyristor controller? The resistor is rated at 100 amps and has a very small ohmic value of 0.089 ohms.
