Let the fun begin !!! ???

[JAZZCNC]

so my question is as follows,.. am i better off to power the VFD and set the parameters without the spindle wired in or does it matter?

Doesn't matter it won't hurt the VFD if spindle isn't attached. I do this all the time.

Don't sweat over the earth on spindle. Just make sure you take the Shield back to the VFD Earth rather than the Cabinet Earth just to ensure you don't create any earth loops. Put an Earth wire from the machine frame to the cabinet Star Earth and you won't have any trouble.

Regards the Water Pump you can have the VFD switch it On/off using the Relay. If the Pump is 24v and doesn't draw to much current(<100ma) then you even use 24V on the VFD so it will power pump. This is how I wire.!

You'll need to set mach spindle output for M3 to which ever relay output you use.

[PAULRO]

it's a 12 vdc pump , on its way . should have it this week or next . i should have asked here about the pump spec. before i went and bought it .

[PAULRO]

can you give the spec. of the pump you use and i'll get it as a back up ?

[PAULRO]

i still have to incorporate the VFD & spindle into the estop. i can either have the estop drop out the VFD which will drop out the spindle or i'm thinking just have the estop drop out the spindle and leave the VFD powered. i read that it isn't wise to drop out the VFD if the spindle is powered up and running because there is a good chance of damage to the VFD. is there a recommended safe way to achieve this?
thanks once again to Jazz for the VFD control sketch as that was the next item on my list. i wasn't sure which terminals to use on the BOB PWM plug and the dwg cleared it up .

[JAZZCNC]

Don't what ever you do put anything between the VFD and spindle to break the circuit ie: Contactor or relay. You will damage the VFD and Spindle.

If you want to play on the safe side then put the VFD power on a timer relay and put this in series with the E-stop.
The E-stop signal back to the control will switch off the Spindle in software when it see's E-stop or put the Run signal from vfd thru NO contact on your E-stop relay for safe measure so not relying on software. The Timer relay will allow time for the spindle to coast to a stop before dropping power to the VFD.
This is the safest way.

Personaly I'm ok with Just putting Run signal thru E-stop contact or Relay in series and leaving VFD under power. I Never leave turning off anything to Software.

Regards the Water pump I bought last ones off Ebay and they where about £15. Can't remember seller name, it was China Job but if get chance I'll take a look.

[PAULRO]

thanks again Jazz. i will organise a delay off timer for that circuit . just to double check a few things with you......
1... the run signal( from VFD) is the ''FOR'' signal from the BOB relay.
2... the PWM connector on the BOB has 3 terminals, +10 v , FIV, GND.
i'm only using the FIV & GND terminal to connect to the VFD.
the +10v terminal remains unconnected?
this side of the build is new to me so i'm being extra cautious !!!!

[JAZZCNC]

just to double check a few things with you......
1... the run signal( from VFD) is the ''FOR'' signal from the BOB relay.

Yes Take wire from FOR and run thru the BOB relay contacts and back to DCM on VFD.

2... the PWM connector on the BOB has 3 terminals, +10 v , FIV, GND.
i'm only using the FIV & GND terminal to connect to the VFD.
the +10v terminal remains unconnected?
this side of the build is new to me so i'm being extra cautious !!!!

Caution is Wise policy if your not sure.!

The +10v is used to provide the reference voltage if you want to control the speed with a Pot (Potentiometer). You don't need it because the BOB provides the reference voltage. (FIV)