Thread: Wiring Diagram check
I believe you are using two 12V fans in series so that you can power them from a 24V supply now have a look at the drawing re the buzzer and the relay coil and see if you can work that out. (I am not trying to be difficult but you have to fully understand the reason) clue is you are halving the voltage with the fans..
The purpose of the override switch is simply to provide a path to ground to energise the relay in the absence of a limit being tripped ie opened...Clive
Alright, I get it now :) Wiring the buzzer in series drops the voltage in half, therefore both the relay and buzzer get 12V, which obviously isn't enough for the relay. So, I need to wire relay and buzzer in parallel and the SPDT switch allows opening the override line that bypasses all switches PLUS a parallel line where the buzzer is. Back to physics 101... ! :D Is this correct ?
I still have to make the changes for the contractor and for the VFD stop.
Last edited by eurikain; 20-12-2015 at 03:34 PM.
I feel it is better for you to work this out and then you will understand it.
Also if you will allow me to correct the name for the contactor instead of contractor (they are two different things in English.) I also wish I could speak your language as well..Clive
Whoops, forgot to pull that wire :) Sorry !!
I'm writing on a MacBook Air, OS X keeps correcting my words especially when it comes to electronics. Contactor gets automatically corrected to Contractor.. sorry :D Are you saying my English is bad ? Lord, didn't think it was that bad :'(
There you go :D
20-12-2015 #35Are you saying my English is bad ? Lord, didn't think it was that bad :'(
There you go :D..Clive
Haha no worries :) Considering that I am not a native English speaker, I'll have to take that as a compliment :). Putting modesty aside, I have to admit that I lived in California a few years back and that's why I happen to have slightly better English than most French speakers you'll encounter :) I try my best to keep speaking, but especially writing and spelling correctly, otherwise you can loose your English in no time.
That aside, I still have a question =) Can someone look at the enable relay circuit I have in the diagram ? I had a discussion with Graeme and I am not sure whether the ENABLE is setup correctly. Should it be a NC or NO relay ? I'm asking because it is confused whether the ENABLE actually works backwards than what its name says. It seems to me that logically, the drivers should only be working when the "enable" gets powered up (5V) and disabled when it has no signal on the line (0V) ?
Last update of the diagrams:
Note: this is a basic wiring diagram.
Potential changes / improvements:
- Some people don't cut power directly from the VFD, they use a the start/stop pin of the VFD control interface and control it with a relay. This is safer for the spindle, it allows the VFD to slow down the spindle gradually without hurting it. if you really want to cut completely power from the VFD, some people (JAZZ apparently) also use a timer relay that delays for a few seconds the power cut to the VFD I'm not sure how to do it, I will look at it some time, and then modify the diagram in consequence.
- Pull earth cable from the star point to the shield of stepper motors and limit switches.
Last edited by eurikain; 16-01-2016 at 08:25 PM.
Who ever quoted me as using Timer relay with VFD is correct but only partly. Mostly I don't Kill power to the VFD I just send it Stop signal.
16-01-2016 #39Statistically you'll use the E-STOP very few times over the life of your machine (unless you're goofy), so stopping all power going to the VFD won't hurt really.
edit Dean beat me to it.
Last edited by Clive S; 16-01-2016 at 07:21 PM...Clive
Sounds good, sorry for the misunderstanding. i'll earth everything. Can anyone provide a brief wiring diagram for how to do the trick please ?
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