#1 Its a CNCRP Plug and Play system already set up and running fine. The BoB they supply outputs both PWM and 0-10 vdc and a Relay output for the VFD.
#2 It starts and runs the Spindle just fine, only does not come up to full speed.
#3 The Spindle works just fine 0 - 400 Hz on a external 0-10 vdc signal.
#4 The relay out to the VFD outputs fine to turn the spindle on-off.
#5 The BoB only outputs 0-7 vdc when connected to the proper terminals on the VFD, the exact same terminals I can input the 0-10 vdc external signal on and it works.
#6 I am not using plug in for the HY drive and never said I was?
#7 The Input Impedance of VFD input is referring to the resistance it presented to a voltage source.
#8 The Input Impedance of the Hitachi is 10K ohms, the Delta is 20K ohms the HY is not specified.
#9 Lower Impedance or resistance would mean a higher current draw, perhaps 20 mA vs 10 mA which still should not be an issue for a signal.
#10 Quick link to the drive.
https://www.driveswarehouse.com/wj200-022sf