CNC Bridgeport retrofit

[MaxHeadRoom]

what is OL?

O/L = Over Load, they are usually fitted on the bottom of a motor contactor and open up the coil if the O/L trips due to motor fault etc.
The method of placing the O/L in the 'neutral' or common grounded side of the coil is frowned on now, as if the neutral is grounded and a ground appears on the this side of the O/L it is defeated.
This was done originally as a easy way to wire it in on Contactor P.B. stations.
The recommendation now is that it is inserted on the 'live' side of the coil.
Max.

[legendboy]

First off.. Max thanks for posting the link.

Legendboy,

You are right with what you said, however...

First, remember that you have a 24 VAC contactor so the L1 and L2 connections will be to 24 volts (transformer).

Second, The M contact (middle lower) could be the unused L3 contact on your contactor, but it would be better if you used a Normally Open Aux contact as Max described above. Your contactor may already have one on the side, if not one will be available. Using the Aux contact keeps the 24 volt stuff away from the line voltage and is safer and easier to understand in the future.

Last, the OL is the motor overloads. They are used to protect motors when the contactor is used to switch motors. In your case they are not needed or used, just ignore them and wire the coil directly to L2 (in your diagram) remember 24 volts NOT actual line voltage.

Sorry to harp on the voltage, just don't want you to get a bad surprise .

O/L = Over Load, they are usually fitted on the bottom of a motor contactor and open up the coil if the O/L trips due to motor fault etc.
The method of placing the O/L in the 'neutral' or common grounded side of the coil is frowned on now, as if the neutral is grounded and a ground appears on the this side of the O/L it is defeated.
This was done originally as a easy way to wire it in on Contactor P.B. stations.
The recommendation now is that it is inserted on the 'live' side of the coil.
Max.

Thanks for taking the time to explain this stuff, greatly appreciated!!

[legendboy]

I was easily able to get that circuit put together for testing but I think I am going to get a din mount contactor like max suggested.

I want to have my off button illuminated when the main machine power is on but the machine is off. Need to be have a nc aux contact to do that.

[MaxHeadRoom]

In that case it is common to have a green light on the ON and RED on the off button.
Max.

[legendboy]

Yep that's what I bought today. They are a lot nicer then the old ab ones I had kicking around.

[MaxHeadRoom]

Another useful link to avoid 'noise'.
http://www.automation.siemens.com/do.../emv_r.pdf?p=1
Max.

[legendboy]

obligatory weekend update



progress has been slow because my life is busy, and I don't get as much time as i would like to have to finish this up. I am really excited to get this thing up and running

[legendboy]

Another useful link to avoid 'noise'.
http://www.automation.siemens.com/do.../emv_r.pdf?p=1
Max.

max do you have the simodrive grounding pdf?

Some are using shielded cable, I have a link some where, but over years, the many VFD's I have installed I have never used shielded, just TEW single conductor stranded and twisted tightly, the ground conductor ran alongside.
Out on the machine I used Liquid seal flex metallic conduit.
Max.

was this for classified area? did you liquid seal?

O/L = Over Load, they are usually fitted on the bottom of a motor contactor and open up the coil if the O/L trips due to motor fault etc.
The method of placing the O/L in the 'neutral' or common grounded side of the coil is frowned on now, as if the neutral is grounded and a ground appears on the this side of the O/L it is defeated.
This was done originally as a easy way to wire it in on Contactor P.B. stations.
The recommendation now is that it is inserted on the 'live' side of the coil.
Max.

i think i kept tripping mine on my standard modern lathe. i have a bunch of turning to do in some stages. First stage was a panic so i wired my rpc, first time i have used rpc power since i sold my vfds.

I kept having to reset it intermittently and scrapped a few parts because of it. Any advice on this would be greatly appreciated!

Someone also told me last week that for single phase in, three phase out VFD'S the vfd should be sized larger then the specified value given in the literature

[macona]

All of my machines have integrated PCs right to the machine. When the power comes on the 5v line turns on a SSR for the main contactor for the machine. The drives have their own contactors that are linked in with the estop and the charge pump circuit. The computer is powered off the mains before the main SSR by either a 220v to 110v line transformer or the computer power supply set to 240v input.

[MaxHeadRoom]

max do you have the simodrive grounding pdf?

I have it, but didn't the link work?

was this for classified area? did you liquid seal?

Liquid seal flex is relatively cheap and durable, you can get the super flexible for cable carriers etc.
I use TEW or MTW single conductor stranded control wire, metalic flex Conduit for shielding.

Someone also told me last week that for single phase in, three phase out VFD'S the vfd should be sized larger then the specified value given in the literature

Check with the Manuf lit. most now do not require de-rating below 5hp.
Max.