Mike Heaney
12-30-2011, 3:38 PM
Folks,
While turning holiday ornaments last week, my trusty, 70 year old Delta 1460 decided to give up on me- specifically, the motor bearing seized up. This provided just the incentive I needed to move into the world of variable speeds, reverse switches etc. I'm going to repair the old motor too, just to have as a backup.
I have purchased, and just received the following:
Y364 Inverter-duty AC motor, Marathon Electric MicroMAX series, 230/460 VAC, 3-phase, 1.0 hp, 1800 RPM, 56C frame
and
GS2-11PO AC micro drive, 1.0 hp, 115V, single-phase input, three-phase output, V/F (volts per hertz) control mode.
From Automation Direct.
Despite the pretty decent instructions that come with the controller, I do have a question, that I'm hoping you all may be able to help me with- it concerns appropriate approaches toward grounding things.
My plan is to mount the controller on a wooden panel, attached to the steel legs of the lathe. The motor will be mounted to the wooden lower shelf below the lathe.
My 110v power supply in my garage/shop comes with a conventional 3 wire setup. Therefore:
L1 and L2 and Ground connections come into the Controller (exactly as shown in the manual). These wires will be fed via a Kreg on/off switch (only to be used in emergency, or when the controller is in the "off" mode)- fyi, the full manual is available on the Automation Direct site if anyone wants to look it up!
I will connect the motor via the T1,T2 and T3 connections, and make the appropriate cross connections per the wiring directions on the motor plate.
The motor does not have a dedicated ground wire, so I planned to clean off the powder coat/paint around either the base mounting or one of the other screws on the motor housing and attach a ground wire from there and connect that back to the Ground lug on the underside of the Controller.
And that is where I just wanted to check something. It is not clear if this Ground lug on the controller connects back to the ground wire from the input supply, there is a suggestion that this lug is partly to ground the controller chassis itself, and somehow do that independently from the Ground that comes with the input supply). The instructions for the controller suggest that a wire from this lug should be connected to a screw on the enclosure, and that this should in turn lead to Ground- however, I do not plan to use an enclosure at this point. Some of the pictures show this ground as separate from the ground connection on the input side. Other diagrams in the manual suggest that the Ground lug on the underside of the controller does connect back to the ground on the input side. I do not currently have the facility to have a standalone grounding system set up, so ideally I am hoping that my plan of running a ground from the motor case back to the Ground lug will be sufficient.
Also, since neither motor nor controller will actually be mounted to the metal of the lathe, I had not planned adding a grounding wire from lathe/lathe legs to this- but I obviously could quite easily if this is a good idea. My thought was to have a ground wire from the lathe attached to the same spot on the motor housing as mentioned above.
Sorry that was all a bit longwinded! I hope it made sense. So in summary-
Ground in via normal house power supply- check
Ground wire from motor housing to Ground lug on Controller
Optional Ground wire from lathe frame to motor housing
am I safe?
many thanks
Mike
While turning holiday ornaments last week, my trusty, 70 year old Delta 1460 decided to give up on me- specifically, the motor bearing seized up. This provided just the incentive I needed to move into the world of variable speeds, reverse switches etc. I'm going to repair the old motor too, just to have as a backup.
I have purchased, and just received the following:
Y364 Inverter-duty AC motor, Marathon Electric MicroMAX series, 230/460 VAC, 3-phase, 1.0 hp, 1800 RPM, 56C frame
and
GS2-11PO AC micro drive, 1.0 hp, 115V, single-phase input, three-phase output, V/F (volts per hertz) control mode.
From Automation Direct.
Despite the pretty decent instructions that come with the controller, I do have a question, that I'm hoping you all may be able to help me with- it concerns appropriate approaches toward grounding things.
My plan is to mount the controller on a wooden panel, attached to the steel legs of the lathe. The motor will be mounted to the wooden lower shelf below the lathe.
My 110v power supply in my garage/shop comes with a conventional 3 wire setup. Therefore:
L1 and L2 and Ground connections come into the Controller (exactly as shown in the manual). These wires will be fed via a Kreg on/off switch (only to be used in emergency, or when the controller is in the "off" mode)- fyi, the full manual is available on the Automation Direct site if anyone wants to look it up!
I will connect the motor via the T1,T2 and T3 connections, and make the appropriate cross connections per the wiring directions on the motor plate.
The motor does not have a dedicated ground wire, so I planned to clean off the powder coat/paint around either the base mounting or one of the other screws on the motor housing and attach a ground wire from there and connect that back to the Ground lug on the underside of the Controller.
And that is where I just wanted to check something. It is not clear if this Ground lug on the controller connects back to the ground wire from the input supply, there is a suggestion that this lug is partly to ground the controller chassis itself, and somehow do that independently from the Ground that comes with the input supply). The instructions for the controller suggest that a wire from this lug should be connected to a screw on the enclosure, and that this should in turn lead to Ground- however, I do not plan to use an enclosure at this point. Some of the pictures show this ground as separate from the ground connection on the input side. Other diagrams in the manual suggest that the Ground lug on the underside of the controller does connect back to the ground on the input side. I do not currently have the facility to have a standalone grounding system set up, so ideally I am hoping that my plan of running a ground from the motor case back to the Ground lug will be sufficient.
Also, since neither motor nor controller will actually be mounted to the metal of the lathe, I had not planned adding a grounding wire from lathe/lathe legs to this- but I obviously could quite easily if this is a good idea. My thought was to have a ground wire from the lathe attached to the same spot on the motor housing as mentioned above.
Sorry that was all a bit longwinded! I hope it made sense. So in summary-
Ground in via normal house power supply- check
Ground wire from motor housing to Ground lug on Controller
Optional Ground wire from lathe frame to motor housing
am I safe?
many thanks
Mike