techymechy
Aluminum
- Joined
- Oct 24, 2018
I am wiring an Allen Bradley 160s-aa04nsf1 VFD to my 1967 Hardinge TM mill. My mill has the power cabinet on the lower right side which includes a fused disconnect, a motor starter, a 240V to 120V transformer to run the controls, and the switches to run fwd/rev and low/high speeds.
The Mill was originally wired for 3 phase input: . The main power cable from the plug has 4 wires: Black/Red/White/Green. The black/red/white were the original 3 phase power and the green is earth ground.
I want to use 240V single phase power and a VFD to power the motor. The black and red wires (hot wires) from the wall cord are wired to L1 and L3, respectively, and the white neutral is wired through the L2 connections. I'm wiring the motor for high speed operation; T1,T2,and T3 are connected together and the VFD will drive the motor T4, T5, and T6 wires. The motor also has a ground coming into the cabinet
I have questions about the 1 phase power going into the VFD and 3 phase power coming from the VFD.
Here is the manual for the VFD: https://literature.rockwellautomation.com/idc/groups/literature/documents/um/160-um009_-en-p.pdf
I'm confused by Fig 2.2 on page 2-3 and the discussion of motor cable types on page 2-6.
For Fig 2.2 - TB1, they reference a Ground screw and screws L2/L3 to be used for single phase power input. Since my VFD is a single phase 240V input, it does not have the L1 screw. Should I use my 240V Black/Red wires to connect to L2/L3 (respectively) and the White Neutral to go to the Ground Screw?
For Fig 2.2 - TB3, they reference the U, V, W going to the motor three phases (T6, T4, and T5, respectively). They also reference that the motor ground should go to the ground screw. Currently, my motor is grounded to the chassis at the motor itself and Earth grounded at the cabinet (Green wire) on the side of the mill. Should I run a chassis (GREEN wire) ground to the TB3 VFD ground?
I am worried about doing this for the manual alludes to, but does not state that the TB1 and TB2 grounds are connected internally, and then I would have my neutral directly connected to my chassis (earth, GREEN wire) ground.
Please let me know if I'm not including enough information in this ask or please ask any clarifying questions.
Thanks for your help.
Dave
The Mill was originally wired for 3 phase input: . The main power cable from the plug has 4 wires: Black/Red/White/Green. The black/red/white were the original 3 phase power and the green is earth ground.
I want to use 240V single phase power and a VFD to power the motor. The black and red wires (hot wires) from the wall cord are wired to L1 and L3, respectively, and the white neutral is wired through the L2 connections. I'm wiring the motor for high speed operation; T1,T2,and T3 are connected together and the VFD will drive the motor T4, T5, and T6 wires. The motor also has a ground coming into the cabinet
I have questions about the 1 phase power going into the VFD and 3 phase power coming from the VFD.
Here is the manual for the VFD: https://literature.rockwellautomation.com/idc/groups/literature/documents/um/160-um009_-en-p.pdf
I'm confused by Fig 2.2 on page 2-3 and the discussion of motor cable types on page 2-6.
For Fig 2.2 - TB1, they reference a Ground screw and screws L2/L3 to be used for single phase power input. Since my VFD is a single phase 240V input, it does not have the L1 screw. Should I use my 240V Black/Red wires to connect to L2/L3 (respectively) and the White Neutral to go to the Ground Screw?
For Fig 2.2 - TB3, they reference the U, V, W going to the motor three phases (T6, T4, and T5, respectively). They also reference that the motor ground should go to the ground screw. Currently, my motor is grounded to the chassis at the motor itself and Earth grounded at the cabinet (Green wire) on the side of the mill. Should I run a chassis (GREEN wire) ground to the TB3 VFD ground?
I am worried about doing this for the manual alludes to, but does not state that the TB1 and TB2 grounds are connected internally, and then I would have my neutral directly connected to my chassis (earth, GREEN wire) ground.
Please let me know if I'm not including enough information in this ask or please ask any clarifying questions.
Thanks for your help.
Dave