Hello everyone, I am looking to link a level transmitter current output to four separate VFDs and one PLC. My initial idea is to utilize PR-3108 splitters, each with one input and two outputs, arranged in a cascade setup. This setup would necessitate the use of four splitters according to my plan. Does anyone have a more effective suggestion or alternative method for this scenario? I have included the current proposal for your perusal. It is important to mention that the LT is not powered by a loop. Thank you in advance for your assistance. - Prasanth
An alternative method involves sending the signal directly to the PLC and connecting a 4-channel analog output card to control the VFDs efficiently.
Alan_505 suggested an alternate method of connecting the signal directly to the PLC and utilizing a 4-channel analog output card for each of the VFDs. Thank you, Alan, for your input. The project requires an Intelligent Pump Control (IPC) system, with the primary objective being to ensure the continuous operation of the pump in the event of a PLC malfunction.
By utilizing a current loop, you have the option to connect at least 2 or 3 devices in series, which can help minimize the need for multiple splitters. Although unconventional, I have observed a successful connection of a 4-20mA signal to 4 different instruments. The key factor here is the current strength, while the series resistance may be slightly elevated. Regardless, it is worth experimenting with to optimize performance.
Avoid using splitters and instead utilize the 4-20mA analog sensors in a series with a VFD and PLC. Connect the analog output of each VFD as the analog input for the next VFD in the system. This method ensures a seamless connection and optimal performance for your industrial equipment.
To effectively distribute a 4-20mA signal to multiple drives, utilize two splitters. Connect the level 4-20mA signal to the analog inputs of the splitters in a series before connecting the splitter outputs to the various drives. One challenge when running a 4-20mA signal in series to analog inputs is the issue of load resistance and potential common mode voltage due to differing grounding potentials of the splitters. Refer to the splitter spec sheet to determine input resistance and the level transmitter spec sheet to ascertain the load resistance it can accommodate. To minimize common mode issues, power the splitters from the same DC power supply. This will greatly reduce the likelihood of encountering common mode voltage problems.
Hi Prasanth, I think you're on the right track leveraging PR-3108 splitters - it's certainly a common solution. However, if you aim for a more efficient setup, you might consider using a multidrop digital communication protocol like Modbus or HART. This way, you can link the level transmitter output to multiple VFDs and the PLC with fewer devices, thus reducing complexity and potential points of failure. Just make sure your devices are compatible with the chosen protocol, and proper configurations are made to avoid any communication issues.
Hello Prasanth, your setup involving the PR-3108 splitters seems reasonable to me. However, you might want to consider using a current repeater with more outputs. For example, a PR-4104 module could serve your purpose pretty well. It can replicate a 4-20mA signal up to six times, hence can directly replace your four PR-3108 splitters, making your setup less complicated. Don't forget that you need to check your total loading calculation due to the additional receivers. Just my two cents!
Hi Prasanth, your setup does make sense, but there might be a more efficient way to achieve this. Rather than using a cascade setup, you could consider using a single multi-channel current splitter. Instruments like the PR-4116 can handle up to four channels, which might simplify your system and reduce breakdown points. It’s a bit pricier, but considering the reduced complexity and increased reliability, it might be a worthy investment. Just make sure to check its compatibility with your VFDs and PLC. It’s also important to check if these instruments require isolated outputs. Hope this helps!
Hi Prasanth, your idea with the PR-3108 splitters sounds like a solid approach, especially since you need to distribute one signal to multiple outputs. However, have you considered using a signal multiplier or a dedicated current splitter designed for multiple outputs? These devices can help streamline your setup and reduce the potential for cascading failures or issues with signal integrity. Also, make sure to check if your current outputs can handle the load of multiple devices connected simultaneously to ensure reliable operation. Good luck with your project!
Hi Prasanth, your plan using the PR-3108 splitters sounds solid, especially for maintaining the signal integrity with multiple outputs. One alternative you might consider is using a signal amplifier instead of multiple splitters; this can sometimes help in minimizing any potential signal degradation. Additionally, ensure that the VFDs and PLC can handle the same input signal levels to avoid compatibility issues. Have you also looked into any digital communication options? That could simplify your wiring and reduce potential points of failure. Good luck, and I hope you find a setup that works well for you!
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Answer: - The proposed setup involves using PR-3108 splitters, each with one input and two outputs, arranged in a cascade setup. This setup requires the use of four splitters.
Answer: - While the cascade setup with splitters is one option, there may be alternative methods such as using a signal isolator or a signal splitter with more outputs to reduce the number of devices needed.
Answer: - No, the level transmitter is not powered by a loop in this scenario as mentioned by the user.
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