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Originally Posted by Vermatitis
Can you post a diagram of this circuit? Does this keep them energized so that the ram can maintain its position?
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If you use a double solenoid, the cylinder will maintain its' position (open or closed / extended or retracted) when power is shut off to the robot because it takes power to move the solenoid to the other position. So, yes, it will keep the 'ram' positioned.
Single solenoids return to their normal position when power is shut off so the cylinder will not maintain its' position.
I assume you are not talking about multi-positioning (stoping mid-way).