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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: October 9, 2015

Boosting Signals With the ECT

Boosting Signals With the ECT
Q: I have an application where we are getting a very weak 4-20mA signal back to the pump control panel. Will using an ECT unit (model ECT/4-20MA/4-20MA/117AC-TX (ECD) help to boost my signal at all?
Published: August 25, 2015

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 20, 2015

E-HELP: Splitter Options Depending on Your Power Source

E-HELP: Splitter Options Depending on Your Power Source
Q: We have been using the ECT-DIN in our applications where we need to split one 4-20mA input to two outputs. The model number for our current units is ECT/4-20MA/2X4-20MA/117AC/DIN. We now need to split a signal to three outputs. Do you have a product that will help us to do this?
Published: August 13, 2015

E-HELP: No Cabling Restrictions for FM Approvals on SIX

E-HELP: No Cabling Restrictions for FM Approvals on SIX
Q: I want to use an SIX Signal Isolator/Converter in a loop with a cable run of 1200’. Are there cable parameter values (i.e. maximum inductance/capacitance) that must be met in order to maintain the FM Non-Incendive certification? 
Published: July 20, 2015
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