I have a 3 phase 50A Telemecanique contactor with a 120V coil. It also has a 4th smaller contact that I assume is for control needs. So that is a total of 4 sets of contacts. I would like to use this as my main Estop cutoff. I got it used but it checks out with .3ohm contact resistance when activated. This is for an SX2 CNC conversion so about 1/2 HP or so spindle.
My plan is to use L1 and L2 to cut neutral and line to the existing motor drive. L3 as the hold-in contacts for the 120V side of the Estop system. The 120V side would have the main stop and restart buttons. It would also have a set of contacts from a 5V relay that takes care of hard limit and Estop signal from the computer, LinuxCNC with kelling BOB.
Now that I have my setup described, here is my main question. Am I OK running a 5V signal on the remaining contacts to kill the drive enable and tell the computer the system is in Estop ? Should I add pull up or pull down resistors or maybe a small decoupling cap? I assume with each box telling the other it is in Estop I will have to hold the restart button and click enable in Linux CNC at the same time, I am fine with this.
And now, the rest of the story.
I do not plan on killing the power to the BOB or the KL4030 drivers. It just kills power to the spindle and the BOB enable. This lets the steppers hold the spindle from falling. The main power switch is only inches from the Estop and that does kill every thing. I am also not modding the mill's system. The Estop on the side of the mill head will only kill the spindle. I plan on using this one for tool changes.
The only limit switch I plan on putting in the main Estop line is the Z low limit. My mill has an adjustable stop that I plan on mounting it to. The rest of the limits will be used as home switches and only go to the BOB.
Thank you for your time.
My plan is to use L1 and L2 to cut neutral and line to the existing motor drive. L3 as the hold-in contacts for the 120V side of the Estop system. The 120V side would have the main stop and restart buttons. It would also have a set of contacts from a 5V relay that takes care of hard limit and Estop signal from the computer, LinuxCNC with kelling BOB.
Now that I have my setup described, here is my main question. Am I OK running a 5V signal on the remaining contacts to kill the drive enable and tell the computer the system is in Estop ? Should I add pull up or pull down resistors or maybe a small decoupling cap? I assume with each box telling the other it is in Estop I will have to hold the restart button and click enable in Linux CNC at the same time, I am fine with this.
And now, the rest of the story.
I do not plan on killing the power to the BOB or the KL4030 drivers. It just kills power to the spindle and the BOB enable. This lets the steppers hold the spindle from falling. The main power switch is only inches from the Estop and that does kill every thing. I am also not modding the mill's system. The Estop on the side of the mill head will only kill the spindle. I plan on using this one for tool changes.
The only limit switch I plan on putting in the main Estop line is the Z low limit. My mill has an adjustable stop that I plan on mounting it to. The rest of the limits will be used as home switches and only go to the BOB.
Thank you for your time.