Bridgeport Manual to CNC conversion...

[John S]

You are not putting the output from the VFD onto 3 separate switches are you ?
If one trips you will fry the VFD.
VFD has to go to motor with no breaks.

[Davek0974]

No, no, no ;)

The output from the vfd goes direct to the terminal bar and then to the motor.

The three contactors are:- VFD 1 supply, VFD 2 supply and Servo's supply.

The VFD's are for main motor spindle and aux high-speed spindle, only one will run at any time.

I think having a terminal bar in between motor and VFD is acceptable.

[John S]

Yes that's fine Dave, hard to tell what someone envisages just from a picture

[Davek0974]

Of course, no worries ;)

A rough idea of the safety/control side of the wiring...

[John S]

Sir,

Sir,
Query please?

You show pin 14 from the XPS as going to relay 1, relay 2 and the coil of K3 but you are also showing K3 across Y1 and Y2 ?

[Davek0974]

K3 controls power to the servo drives, the N/C contact on the XPS monitors the K3 unit, if it is jammed or fails to open, the XPS does not pull in and Mach will stay in reset as well as no spindle relay/contactor supply.

If K3 jams on despite pressing the E-stop or limits, it will not latch-in again.

It was a reasonable safety enhancement i think.

As with all systems, a catastrophic failure - in this case K3 welding shut on one or more lines will still leave a danger but the chances of a contact weld at these low currents is pretty rare i think?

[m_c]

You do realise that a standard contactor is designed so that if one contact welds shut, the others will still open?