Hello everyone, I am new to working with a 1734-IE2C analog module. My current task involves wiring a Flomec model G2S15F 4-20ma flow meter to the analog input card. The programming is being done remotely by the OEM. There are 2 wiring diagrams for me to choose from. The flow meter is a 6-wire device requiring 24 volts for power with marked terminals, 4-20ma with marked terminals, and pulse output with marked terminals that are not used. The power is connected to the flow meter and the wiring has been completed to the input card. However, I am encountering a signal failure on the HMI display. The current wiring setup involves connecting the V terminal of the analog card to the 4-20ma (-) terminal of the flow meter, and then connecting the 4-20ma (+) terminal of the flow meter to the input terminal of the analog card. I have attached a picture for reference. Could it be possible that I have wired the sensor incorrectly? Any suggestions would be greatly appreciated. Thank you in advance, James
When connecting a 4-wire device, it is crucial to wire the 4-20mA + to the module's input and the 4-20mA - to the Common C on the module. The power source for the device can be from the V and C terminal or an external power supply, depending on the device's load requirements. It is important to note that the current wiring configuration is intended for a 2-wire loop-powered device, where the analog module supplies the 24v for the loop. If this is not the case, adjustments may be needed for proper functionality.
Thank you for bringing to my attention the mistake I made after posting. James.
Hi James, Looking at your wiring setup, you might have the analog card and flow meter wired incorrectly. The V terminal on the analog card is typically the supply voltage terminal, but you have it wired to the 4-20mA (-) terminal, which is usually the ground or return path for the current loop. It might act differently in some models but that's generally the case. Try swapping your connections: connect the V terminal on the analog card to the 4-20mA (+) terminal of the flow meter — this would provide the supply. Then connect the 4-20mA (-) terminal of the flow meter to the I terminal on the analog card — this would complete the return path for the current loop. See if that changes anything on the HMI display. Remember to power down before making these changes to prevent any electrical shorts or damage. Hope this helps!
Hello James, Welcome to the forum! There could be a couple of things going wrong from what you've described. One common error might be the use of the V terminal on the analog card for the 4-20ma (-) connection to the flow meter. Normally, the V terminal is used for voltage input, not current. Since you're working with a 4-20ma device, you might want to consider using the I (current) terminals on your analog card instead. Second, ensure that your Flomec flow meter is properly grounded. Improper grounding can lead to erratic or inaccurate flow measurements. Lastly, you mentioned that the pulse output terminals on the flow meter are not being used. While they might not be needed for your current programming, pulse outputs can provide a valuable secondary data stream or a backup in case of 4-20ma signal failure. I recommend revisiting and possibly updating your wiring according to these suggestions. Let us know how that goes!
Hi James, Based on what you've described, it sounds like the wiring might actually be reversed. For the 4-20ma signal connection, usually, the (+) terminal on the flow meter should be connected to the '+' (I+) terminal on the module, while the (-) terminal on the flow meter should link up to the '-' (I-) terminal on the module. It's a common mistake, so don't worry. Try reversing the connections and see if that resolves your HMI display signal failure. Just to remind you, always turn off the power when changing wiring to prevent any potential issue. Good luck!
Hi James! It's great that you're diving into this project. From your description, it sounds like you might want to double-check the polarity of your connections. Typically, the 4-20mA output should have the positive (4-20mA +) connected to the input terminal of the analog card, and the negative (4-20mA -) connected to the common or ground terminal of the card. It’s also a good idea to verify that the analog card is configured correctly to read the 4-20mA signal. If everything looks right and you're still seeing a signal failure, troubleshooting with a multimeter to check the output from the flow meter could also help identify if the issue lies with the wiring or the device itself. Best of luck, and feel free to share updates!
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Answer: Answer: Signal failure on the HMI display could be caused by incorrect wiring of the flow meter to the analog module. Ensure that the connections are made according to the correct wiring diagram provided by the OEM.
Answer: Answer: The Flomec flow meter should be connected to the analog module following the specific wiring instructions provided by the OEM. Typically, the 4-20ma output terminals of the flow meter should be connected to the corresponding input terminals of the analog module.
Answer: Answer: Signal failure can occur due to various reasons such as incorrect wiring, faulty connections, power supply issues, or configuration errors. Double-check the wiring connections and ensure they match the specifications provided by the manufacturer.
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