This blog post will describe current best practice or optimising the installation of a continuous position sensor (CPS) on to a pneumatic linear actuator.
For the purposes of the guidance, we’ll use the Parker P8S CPS (Continous Position Sensor) as a reference example. Despite being available in a range of configurations – including IO-Link or analog feedback signal, a choice of outputs and various measuring ranges – the installation procedure is common for all P8S types.
The P8S CPS is suitable for direct mounting to any T-slot cylinder. So, as a point of note, if another cylinder variant is used, such as a tie-rods or round body type, separate brackets will be required.
First of all, please appreciate that the CPS should be installed in line with the correct operating voltage. After all, there will clearly be differences between, say, an M8 analog connection versus an M12 IO-Link.
When ready to begin, move the position of the cylinder’s piston to the desired starting point – known as the zero point. Now you can insert the CPS into the cylinder’s slot or bracket, with the cable pointing back towards the zero point. To determine exactly where the CPS should be positioned, move the device until the yellow LED is illuminated. Then, slide the CPS away from the zero point until the LED turns off, and slide it back again to the position where it lights up once more. That’s your position for the CPS, so you can now secure it in place using the set screws.
Moving to configuration, this process can be performed using the teach button on the CPS. With the CPS correctly installed and the piston in the zero position, press and hold the teach button for two seconds. The LED should now blink and you can release it. The zero point has been stored in memory.
Next, set the piston position for the end point of the desired measurement range. Press the teach button once, and the measurement range has been stored. The analog signal or IO-Link process data is now configured to this range.
So far, so good. Now, move the piston from zero point to end point and check to ensure the LED remains lit throughout the travel. If you notice that the LED turns off at any point, simply repeat the configuration steps above.
To reset the measurement range to the maximum possible range, press and hold the teach button for five seconds. If you are deploying the IO-Link version of the Parker P8S, the measuring range can be configured using parameter commands, which also outline how the teach button can be locked out, for example. You can refer to the Parker Pneumatic CPS Installation Guide for more details on specific parameter commands.
All pretty straightforward - like anything it’s only easy if you know what you’re doing! Hopefully this short blog has proved useful in highlighting best practice when it comes to installing and configuring CPS sensors.
Watch in this video How to Install and Configure the P8S Continuing Position Sensor.
Article contributed by Franck Roussilon, product manager, Actuators Europe, Parker Hannifin, Pneumatic Division Europe