Grain Systems PNEG-1587 - Manual (Page 8)

8 PNEG-1587 KBIC SCR Control Kit Installation
3. Adjusting SCR Motor Speed
Maximum Potentiometer Adjustment
With dryer unload circuit energized, set the SCR Speed Control knob on the ASC panel to 100%. Using
a small blade screwdriver, adjust the maximum potentiometer to obtain 155 VDC across the DC motor
armature terminals A+ and A- on the KBIC board. (NOTE: Some early M-Series dryers were designed
to operate with a 175 VDC armature voltage. Consult the factory if there is any question regarding these
early models.)
Minimum Potentiometer Adjustment
Set the SCR Speed Control knob on the ASC panel at the 10% setting. Adjust the minimum potentiometer
to obtain 15.5 VDC across the DC motor armature terminal A+ and A-.
Recheck the maximum potentiometer setting and readjust if necessary. Repeat and readjust the
minimum potentiometer if necessary. Rechecking the maximum and minimum potentiometer settings
once should be sufficient.