Let the fun begin !!! ???

**PAULRO** · 06-04-2015

i thought i had cat 5 cable but it turned out to be shielded 3 pair twisted so used that. the cat 5 cable wil surly turn up now that i have the drives wired. i have yet to wire the fault terminals from the em806 drives to the dedicated estop input which disables the drives once triggered but i can't find any examples on the forum so if any one can shed some light to get the subject......... i also set the micro stepping to 1600, is this o.k.?

**JAZZCNC** · 07-04-2015

Originally Posted by PAULRO

i thought i had cat 5 cable but it turned out to be shielded 3 pair twisted so used that. the cat 5 cable wil surly turn up now that i have the drives wired. i have yet to wire the fault terminals from the em806 drives to the dedicated estop input which disables the drives once triggered but i can't find any examples on the forum so if any one can shed some light to get the subject......... i also set the micro stepping to 1600, is this o.k.?

1600 MS is fine.

Several ways to use the Fault signal but an easy and safe way is use a Relay with the coils wired in parallel running thru fault signals set Active low and the E-stop running thru a NC contact. This way when any of the drives fault triggers it turns on the relay which opens the NC contact triggering the e-stop.
The E-stop should then kill power to the drives which in turn drops power to the relay allowing E-stop Reset and the drive fault is cleared because power was removed and fault reset on new start up.!

Other way is not very safe as it's relying on control software to stop machine but very easy to wire. It also doesn't clear the fault so you'll need to reset the drives manually. ( For this to work set Input to Active High in Mach3)

drawn both to show.

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**PAULRO** · 07-04-2015

Thanks for that Jazz, i got totally confused trying to accommodate a hardwired circuit with the e stop and an alarm input to the BOB( both versions of what you have sketched). my BOB has a dedicated input for force turning off the ENABLE, at least i think that's what it does. i'm trying to use just 1 relay and as it stands and i have that in the PSU & e/ stop circuit. I have updated the dwg to reflect what i think is your schematic. i probably don't need an input from the alarm drives to the BOB. i got caught up in thinking that an input to MACH 3 was required. i also had a look at Eddies dwg and saw that the alarms from his drives were in series so that added more ??????. as in connecting a ground wire to the positive terminal of the alarm drive and out the negative terminal and on to the next drives positive terminal etc. that really had me confused along with a dose of the flu which got my head in a spin. i don't need an e/stop signal to the BOB so on reflection , or do i?

**PAULRO** · 07-04-2015

my psu breaker keeps tripping when i power up . it's a 6 amp, C rated. i think it's either the relay or the push switch i'm using .when i bypass both of them and use the switch on the door to power up everything's fine . i'll have another go at it tomorrow. perhaps a safety relay might be getting a call from the bench sooner than planned. on reflection after some reading i'm sure i will be using an input on my BOB for an E/stop. Mach 3 tutorials reveal alot!!!!

**Clive S** · 07-04-2015

Depending how big your transformer is you might have to rate the mcb a little higher see this: http://www.neweysonline.co.uk/MCBs/Static.raction ..Clive

**JAZZCNC** · 07-04-2015

I need a re-cap on what your using for the main PSU.! . . . Safety relay won't do anything for inrush current if your using toroidal PSU.
If PSU is toroidal then try a D rated MCB.!! . . . . But first you need check everything else is wired correct because the relay and switch shouldn't make any difference so if removing made a difference then suggests you got something wrong.?

Also Not sure what your meaning by using an Input for E-stop.?. . . If your meaning to ONLY use an input for the e-stop then it's a Bad idea.!! All you will be doing is relying on the Software to stop the machine which isn't safe at all.
The correct way is to remove power using relays and then inform Control software the E-stop as happened via an input. Only thing the Input is used for is telling software to stop the G-code and don't allow Control to reset until input state changes.

**PAULRO** · 08-04-2015

I checked the wiring and it's all fine, once i power up it trips. if i reset it and and power up again but this time restricting the MCB ( momentarily) from tripping then it works. so i thought i would rewire it temporarily and take the relay out of the PSU circuit and just go from main switch to MCB to primary coil of PSU and that too works a treat( MCB not tripping ).
ya, i will leave the e/stop hardwired to dropout the PSU but inform MACH3 through the BOB that an e/stop has occurred so it can do its duty.

**JAZZCNC** · 08-04-2015

If you have one just for testing sake then try a 10amp Mcb it may work for you to get going and check all the sytem correctly.
Don't cut corners with the electrical safety or hot wiring system just to get going as it will bite you if not careful either by frying components or not stopping as expected etc.!! . . . . I'm very confident with wiring these machines and still I get caught out when hot wiring to get some thing going so be warned.!!!