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Can you use one 4 - 20ma signal as a speed reference to power 2 ATV66 drives?

You can wire the 4 -20 ma signal in series to both drives(AI of 1st drive to common to AI of second drive with common of that drive being negative side of signal) as long as the power supply on the 4-20ma source can handle the drives total impedance ( for the ATV66 the impedances are 250 ohms + 250 ohms = 500ohms total -- various drives may vary with this spec.) Best thing would be to use a signal splitter (can obtain from Wilkerson Inst., Omega, Action Instr. , etc to name a few) for an isolated signal.

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