Issue: Our programmable logic controller (PLC) has a 4-20mA output, while the actuators it is supposed to regulate require a 0-135Ohm signal. Purchasing multiple individual converters may solve the problem, but we are in search of a more compact and cost-effective alternative. Unfortunately, replacing the actuators with those that operate on a different control signal is not feasible. Despite extensive research, I have been unable to find multi-channel signal conditioners that can convert 4-20mA to 135Ohms. I did come across an 8-channel device that accepts 4-20mA inputs and provides -10V to 10V outputs. However, I am unsure how to obtain a 0-135Ohm output from a 0-10V signal. Any guidance on this matter would be greatly appreciated.
Boiler and HVAC systems often require controllers ranging from 0 to 135, with a high prevalence of single-channel options. Finding a multi-channel solution may be challenging due to the specific design requirements of these systems. However, the DRN series by ACI is a widely available option known for its compatibility with various manufacturers' valves in the industry.
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Check out: HVAC Technician Training: A Simple Method to Convert Resistance Values of 0 - 135 ohms to a 4 - 20mA Signal.
Converting a 0-10V signal to a 0-135 Ohm output could be achieved by using a basic voltage-to-current conversion circuit. You could use an operational amplifier and a precision resistor to convert the voltage output of the signal conditioner into a current output, then run this through the coil of a relay with the appropriate resistance. However, it might get a tad complex if you're not tech-savvy. Another alternative would be to use an industrial I/O module, some of these are designed to handle multiple input/output specifications and might be a more compact solution. Just ensure to verify the compatibility of whatever you decide to use with your existing PLC.
An inexpensive and efficient solution might be to use voltage-to-resistance conversion using simple Ohm's law. If you can obtain a 0-10V output, you can then convert this to resistance using a proportion based on your actuator's specifications. So instead of looking for a direct mA-to-Ohm conversion, you can add this additional step. This could simplify your search for signal conditioners and may save you from needing to purchase multiple individual converters. You'll need to ensure you set this up correctly to avoid inaccuracies.
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Answer: Answer: Yes, there are devices like signal conditioners or converters that can perform this conversion, offering a more streamlined solution than purchasing multiple individual converters.
Answer: Answer: While multi-channel signal conditioners may not directly provide a 0-135Ohm output, there are alternative solutions available that can achieve this conversion effectively.
Answer: Answer: To convert a 0-10V output to a 0-135Ohm signal, additional components like resistors or other signal conditioning devices may be required. Consulting with a technical expert or conducting further research on signal conversion methods could provide the necessary guidance.
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