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E-HELP: Isolating Feedback on VFDs

E-HELP: Isolating Feedback on VFDs
Q: We are a boiler/burner company dealing with a rising amount of computer-based burner controls. We have installed several and have some blowers that are controlled by VFDs (Variable Frequency Drives). We have run into issues with noise on certain systems. We get occasional problems with 4-20mA feedback from the VFD despite going through the proper grounding techniques. We are wondering if installing an opto isolator on the feedback loop might eliminate our issue. We have used the SIX Signal Isolator many times on the signal going to the VFD to offset impedance issues on the VFD. Can we put an opto isolator on both signals?
Published: January 3, 2018

E-HELP: SIX Maintains Passive Resistance Regardless of Power

E-HELP: SIX Maintains Passive Resistance Regardless of Power
Q: Will the SIX Signal Isolator/Converter pass input signals through if the output is disconnected? We will be replacing our DCS, so we need to know if the input side will continue to work while the DCS is disconnected.
Published: August 18, 2017

EHELP: Can you help specify a splitter that can send the signal to both control systems?

EHELP: Can you help specify a splitter that can send the signal to both control systems?

Q. I have two different control systems and I need some splitters to split a 4-20 mA signal. I may need to have the loop isolated. Can you help specify a splitter that can send the signal to both control systems where I can use the splitter connected in a series on the original loop? My company has used the SIX in the past, would this work?

Published: July 12, 2017

EHELP: Applying the SIX 2-wire Signal Isolator and Converter

EHELP: Applying the SIX 2-wire Signal Isolator and Converter

Q: I am evaluating the SIX 2-wire Signal Isolator and Converter. Is this device auto-calibrated or will we need to calibrate it ourselves? Does it require two separate power supplies? The specs state that the output is loop powered but I am not clear on the input. Also, is it a problem if we supply both the input and output with the same power source?  In our case, it would be the 53.5VDC power supply in the loop currently.  We would need to run a parallel path. The input is intended to be a 4-20mA.

Published: February 23, 2016
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