techymechy
Aluminum
- Joined
- Oct 24, 2018
I am wiring a Allen-Bradley 160s-aa04nsf1 ser c VFD into my Hardinge TM mill. My VFD is a 240V single phase in and 240 3 phase out.
I wired TB1 so that my single phase hot lines are on L2 and L3 and my neutral on the ground connector.
I have wired TB2 so that I have my motor T6 wired into my VFD U, my motor T4 wired into my VFD V, and my motor T5 wired into my VFD W. I have my motor T1,T2,T3 connected together.
I have a question: should I run my motor ground to the TB2 ground screw directly or should I connect both the motor ground and VFD ground to my milling machine chassis ground?
The picture of the VFD in the manual looks like the ground screws on TB1 and TB2 are connected. I have my 240V single phase neutral on the TB1 ground. Would I have a ground loop if I connected the motor ground to the single phase neutral? I know that the single phase neutral is at ground somewhere. I have a UFER ground in my house that is for my formal ground (green wire). My motor is supposed to be grounded to the chassis at the motor too (according to the schematic).
Please advise if I should hook the motor ground to the TB2 ground only, or if I should tie this ground into the milling machine chassis ground (from the green wire).
Thanks,
Dave
I wired TB1 so that my single phase hot lines are on L2 and L3 and my neutral on the ground connector.
I have wired TB2 so that I have my motor T6 wired into my VFD U, my motor T4 wired into my VFD V, and my motor T5 wired into my VFD W. I have my motor T1,T2,T3 connected together.
I have a question: should I run my motor ground to the TB2 ground screw directly or should I connect both the motor ground and VFD ground to my milling machine chassis ground?
The picture of the VFD in the manual looks like the ground screws on TB1 and TB2 are connected. I have my 240V single phase neutral on the TB1 ground. Would I have a ground loop if I connected the motor ground to the single phase neutral? I know that the single phase neutral is at ground somewhere. I have a UFER ground in my house that is for my formal ground (green wire). My motor is supposed to be grounded to the chassis at the motor too (according to the schematic).
Please advise if I should hook the motor ground to the TB2 ground only, or if I should tie this ground into the milling machine chassis ground (from the green wire).
Thanks,
Dave