Hi, I have not been able to remember the person who got back to me about arc suppression on relays and thanks to Carl for the info on the Thorn DC motor speed controllers. Recapping the controllers did the trick and having one of the DC motors overhauled did the trick.
The subject of Arc suppression on relay contact was solved by a .1ufd capacitor in series with a 100ohm resistor across the contacts. I had a strange occurrence when I tried the same thing across the temperature controller contacts that the temperature controller overrode the set values. I had to remove the capacitor and resistor from the controller. The capacitor and resistor were across the internal contacts using the external screw contacts I have yet to determine the best solution I will let everyone know how I got on. I would like to hear any thoughts on the subject.
The subject of Arc suppression on relay contact was solved by a .1ufd capacitor in series with a 100ohm resistor across the contacts. I had a strange occurrence when I tried the same thing across the temperature controller contacts that the temperature controller overrode the set values. I had to remove the capacitor and resistor from the controller. The capacitor and resistor were across the internal contacts using the external screw contacts I have yet to determine the best solution I will let everyone know how I got on. I would like to hear any thoughts on the subject.