Hey Brian,
some differences in short (as far I know):
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The Hitachi WJ200, the Omron MX2 and the Hitachi S1 have a Modbus Override capability (described here and here). This allows altering the spindle rpm during a short g-code program pause, or stop the spindle during a program paused over night and to start spindle again and to resume the g-code program the next morning without disabling Modbus control. I don’t know if the Invertek E-3 or the Teco L510 have this too. Note: This seems not relevant for use on the Masso since it is not capable of Modbus communication.
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The Hitachi WJ200 and the Omron MX2 are practically identical, but the Omron is capable of frequencies up to 580 Hz while the Hitachi only 400 Hz. Since the spindle speed calculates
SPINDLE_RPM = $VFD_FREQ × 2 × 60 / $SPINDLE_NUMBER_OF_POLES
this means
400 Hertz × 2 × 60 seconds / 2 poles = 24,000 rpm vs.
580 Hertz × 2 × 60 seconds / 2 poles = 34,800 rpm,but this is only important for spindles like these.
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The Invertek Optidrive E-3 is designed and made in the UK. This is the next VFD I will try out (I own the Omron MX2). Omron and Hitachi are Japanese brands but produce VFDs mainly in China. I don’t know where TECO-Westinghouse produces their VFDs (see company profile), but they produce some in the USA and some in Taiwan and Malaysia. You could try to find an owner on the www and try to look at the nameplate.
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The Omron MX2 and the Hitachi WJ200 have more digital inputs than the other VFDs mentioned here. Search for “wiring diagram” inside the PDF manuals to see the inputs and outputs.
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The Hitachi S1 (Hitachi S1 Series Basic Guide) seems to be nearly identical to the Galt G200 (Galt G200 Series Manual (PDF)).
All VFDs mentioned here have analog voltage and current inputs so the spindle speed can be controlled by the Masso CNC controller, which is not capable of Modbus communication.
Before buying, I would study all of their manuals.