I have been assigned the task of integrating a 3-wire pressure differential transmitter, specifically the Veris PW Series, into a system and connecting it to an existing PLC board. This transmitter has three wires for positive, negative, and signal connections. My goal is to configure it for a 4-20mA output, however, the wiring diagram for the PLC card I intend to use only shows provisions for positive and negative connections. How can I successfully connect the three conductors from the transmitter in this scenario? One possible solution could involve sourcing power from the cabinet, but I am unsure how to transmit the signal to the control board. Your assistance in resolving this issue would be highly valued, as I am seeking guidance on this matter. Thank you for your help!
The power supply serves as the main source of energy for the device, while the signal and power share a common ground. The output signal ranges from 4 to 20 mA.
Ah, now I understand. Appreciate the clarification, Tom!
Do you know the complete model number of the transmitter? Some of these transmitters are versatile, able to function as either a 3-wire voltage output or a 2-wire 4-20mA device.
The Veris PWLX04S model is equipped with a versatile output system, offering users the choice between 4-20mA, 0-5V, or 0-10V options for 3-wire transmitters. While the manual does not explicitly mention loop-powered functionality, my understanding of instrumentation and controls is still developing.
According to jgruizinga, the manual specifies the output options for a 3-wire transmitter as user-selectable 4-20mA, 0-5V, or 0-10V signals. This indicates that the transmitter itself supplies the loop excitation power.
Your plan to source power for your pressure differential transmitter from the cabinet seems a good start. However, for your signal wire, consider wiring it directly into an analog input on the PLC. Just ensure you've set it to 4-20mA to match the output of the transmitter. Remember, in a three-wire configuration, you're typically dealing with one wire for power (V+), one for ground (V-), and one for signal output. A common mistake is confusing signal ground with power ground - check your manual carefully!
It sounds like you're on the right track by thinking about sourcing power from your cabinet. In your situation, the positive (V+) and negative (V-) from your transmitter can indeed be connected to your power source. The signal wire, on the other hand, should be wired directly to your PLC analog input. Think of it this way: your transmitter is like a variable resistor modulating current between 4-20mA, which should be read by the PLC. You would need a module, such as a 4-20mA current loop receiver, on the PLC side to interpret this current signal correctly. I'm interested to know if your PLC has this feature or if you will need an external module. It might be helpful for you to provide us with the make and model of your PLC board for more specific advice.
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Answer: To connect a 3-wire pressure transmitter with positive, negative, and signal connections to a PLC board that only has provisions for positive and negative connections, you may need to source power from the cabinet and find a way to transmit the signal to the control board.
Answer: Yes, when integrating a Veris PW Series transmitter, you may need to address the wiring configuration, especially when trying to achieve a 4-20mA output.
Answer: One possible solution could involve sourcing power from the cabinet and finding a way to transmit the signal to the control board. It's important to carefully plan and execute the wiring to ensure a successful connection.
Answer: You can reach out to experts in the field or online communities for assistance and guidance on resolving the wiring issue and successfully connecting the transmitter to the PLC board.
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