I have been instructed to assess the performance of the Dwyer Series SVP Proportioning Solenoid Valve for PLC-controlled flow and pressure. The valve allows for adjustable flow rates within a range of 0-24VDC (@400mA) - which may not be the most common control signal choice. It seems challenging to find signal converters or conditioners that can work with a 0-24VDC output and 4-20mA or 0-10VDC control input. The available options for converting this signal to a more common range are limited, making it difficult to find a suitable solution. The flow rate to voltage curve of this valve is not ideal, but I am curious if there are any better alternatives than investing in an expensive programmable 0-30VDC power supply with rs232 communication to the PLC for controlling the valve. More information about the Dwyer Series SVP Proportioning Solenoid Valve can be found here: https://dwyer-inst.com/media/customuploads/files/F-82.pdf
After considering different options, I came across a 24V DC motor controller that operates with a 0-5VDC input and delivers an output of 0-24V when paired with a 24V power source. Some models are advertised as compatible with input voltages ranging from 5 to 24V or 24 to 90V, depending on the power source. However, most of these controllers utilize Pulse Width Modulation (PWM) instead of providing a direct DC output, which raises doubts about their compatibility. If they do work, it essentially serves as a 0-5V to 0-24V signal conditioning device. In a previous job at a workshop handling hot presses powered by hot oil and cooled by chilled water, temperature control was achieved using two variable valves to manage the flow of oil and water, operating within a voltage range of 0-24V.
When looking for a solenoid driver, it is common to find that proportional valve solenoids are typically operated using a PWM signal. The purpose of a solenoid driver is to convert a process signal range of 0-10 or 4-20 into a PWM output, ensuring that the driver restricts the output current to the desired level.
I recently reviewed the construction details of a variable pressure hydraulic press that I previously installed a control panel for. The press featured a Bosch variable valve with a 0-10V range, along with an interface card that accepted 0-10V inputs.
The 0-24VDC voltage range is frequently utilized for controlling Hydraulic proportional valves. WEST offers a variety of amplifiers designed specifically for this application, such as those compatible with -10 to +10 analog outputs. To learn more, you can refer to the following link: https://www.w-e-st.de/files/pdf/PAM-199-P-EN.pdf.
The SUN XMD-0x controller is an excellent choice for controlling 0-24vdc pwm valves. I highly recommend it for optimal valve operation.
I've also found the Dwyer Series SVP Valve to be a bit tricky, with its uncommon control signal choice. However, instead of investing in a costly power supply, you might want to discuss with your industrial automation supplier about specialized signal converters that could solve your problem. I've done some work with companies that produce signal conditioners specifically designed for unusual ranges. Also, you'd better compare the long run costs and benefits. Sometimes spending a bit more upfront on a programmable power supply can result in a better, more scalable solution in the long run. Lastly, you might want to consider alternate valve models that operate within a more standard control signal range if this continues to be an issue. For instance, the Jefferson Solenoid Valves might be an alternative, although application-specific factors need to be considered before making a switch.
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Answer: Answer: The challenge lies in the valve's unique control signal range of 0-24VDC, which may not be compatible with common PLC control signal ranges like 4-20mA or 0-10VDC.
Answer: Answer: Limited options exist for signal converters or conditioners to convert the 0-24VDC output to more common control signal ranges, making it difficult to find a suitable solution.
Answer: Answer: One alternative mentioned is investing in an expensive programmable 0-30VDC power supply with rs232 communication to the PLC, but it may not be the most cost-effective solution.
Answer: Answer: More information about the valve can be found in the document provided at this link: https://dwyer-inst.com/media/customuploads/files/F-82.pdf
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