Work Supports / Double Acting, Position Sensing
Frequently Asked Questions
What if I want to run a different pneumatic pressure switch than what Vektek engineers recommend? Any programmable pneumatic switch that interfaces with the machine tool logic can monitor air pressure in the Return Position Sensor circuit. Also see Air Sensing Control Kit 50-8240-00. Is it okay to route my air through a rotary union? Yes, size the rotary union so that there is a separate path for the air circuit. Do I need a pneumatic pressure switch for each work support on my fixture? No, connect all the Work Supports (that are on the same hydraulic circuit) with an air circuit feeding the Return Position Sensor to one pneumatic pressure switch.
We are already using Double Acting Work Supports; why would we need to use the Return Position Sensor? Extended Work Supports could cause a crash. Use the Return Position Sensor in any automated system where work support retraction is critical before the unload/load cycle begins. Monitor the position of Work Supports and confirm all is clear before unloading/loading the part. Does the Return Position Sensor also tell me that the work support is extended and locked? No, the Return Position Sensor only communicates that the Work Supports have retracted. Even though the pressure drops when the supports extend, it does not indicate that all the Work Supports have extended or are locked. Can I add a Return Position Sensor to my existing double-acting work support? No, adding the Return Position Sensor requires a specific body, a longer plunger and different contact spring. Adding the Return Position Sensor also increases the work support length from the mounting flange to the contact bolt. Please contact your Vektek Customer Support Specialist for more information. How many Work Supports with Return Position Sensors can I put on one pneumatic circuit? The maximum number of Return Position Sensors in one circuit is a function of the circuit design and pressure drop over the length of the circuit path. Vektek has tested ten devices plumbed in parallel with excellent results.
B-25
U.S. Patent No. 8,444,128
Device Operation The Return Position Sensor unit requires continuous and regulated air pressure. In the retracted position, air pressure will build in the system to the regulated set pressure. An air logic switch detects the “retracted” pressure condition and signals the controller that Work Supports have retracted. When the work support extends, the internal check opens and vents air from the device. The system air pressure falls to the “extended” preset pressure and an air logic switch resets. When the support retracts, the internal check closes and air pressure again builds to the regulated value. The air pressure switch detects “retracted” pressure and again signals the controller that the device is in the retracted position.
© Vektek, January 2023
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