Here we go. I did it on my netbook so excuse the hacky drawing job.
The control system has three states:
If both relays are relaxed then the motor has gnd on the top connection and gnd on the bottom connection. ie pump off
If the top relay is energized then the motor has live on the top connection and gnd on the bottom connection. ie pump fill
If the bottom relay is energized then the motor has gnd on the top connection and live on the bottom connection. ie pump empty.
This is how I have my ballast system and it has been trouble free for many seasons.
Last edited by ralph; 08-24-2011 at 3:27 AM.
Reason: Brain malfunction
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