Even your digital voltmeter cannot read the non sinusoidal wave form correctly, so your 9 VAC from your TIU, is probably not really equal to 9 VAC of sinusoidal waveform energy, out of an old ZW......so just oil your trains and have fun running the old stuff with of the DCS...I've been doing that for years, but the old stuff needs a lot more lube attention than any of the newer stuff. BTW, I'm an Electrical Engineer, that works daily with Variable Speed AC and DC drives....with and without encoder feedback. Also note the DCS doesn't read voltage, as noted above by John.
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