This circuit was found in an old SCR manual. The types used are from the time, but the setting can be applied to modern components. Note that this is a series motor control where the field winding is in series with the armature winding.

This circuit was found in an old SCR manual. The types used are from the time, but the setting can be applied to modern components. Note that this is a series motor control where the field winding is in series with the armature winding.