Hi Kris,
Your "drawing" is still very confusing.
But no. You can not connect loads (L1,L2) across the switches. If you do when the switch is open,
current will not stop flowing. it will still flow through the load.
Regards TK
| Group: DynoMotion |
Message: 6709 |
From: chrismd500 |
Date: 2/12/2013 |
| Subject: Re: Issue with a small 5mW laser and a limit switch... |
Tom,
Yeah just forget about the drawing, it was not that good in the first place and the formatting got screwed up when it was posted, both times. (There is a 'Use Fixed Width Font' under 'Options' when viewing a message, that helped somewhat).
Ok so current will flow even though the relay driver is off? L1 is connected to ground, L2 is connected between two switches. So I can't use L2 then (if I want S1 working)?
Thanks
Kristoffer
--- In DynoMotion@yahoogroups.com, Tom Kerekes wrote:
>
> Hi Kris,
>
> Your "drawing" is still very confusing.
>
> But no. You can not connect loads (L1,L2) across the switches. If you do when the switch is open, current will not stop flowing. it will still flow through the load.
>
> Regards
> TK
>
>
>
> ________________________________
> From: chrismd500
> To: DynoMotion@yahoogroups.com
> Sent: Tuesday, February 12, 2013 6:30 AM
> Subject: [DynoMotion] Re: Issue with a small 5mW laser and a limit switch...
>
>
> Â
>
>
> Here is a better figure:
>
> (GND)--------(S1)--------(S2)-------(LIM 0- pin)
> Â Â Â Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â |
> Â Â Â Â Â Â Â (L1)---------(L2)
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â |
> Â Â Â Â Â Â Â Â Â Â Â Â Â (5V)
>
> --- In DynoMotion@yahoogroups.com, "chrismd500" wrote:
> >
> > I have an issue with a 5mW laser and a limit switch. Probably not so much a kflop/kstep issue, but more a basic electronic question that I hope someone here understands better than me.
> >
> > I have two NC switches in series between the LIM 0- pin and GND.
> >
> > Since Kstep has two relay drivers up to 100mA I decided to connect two positioning laser in parallel to one of the relay drivers.
> >
> > Ideally I would have liked to have a separate GND wire to the lasers, but I'm already using all the 8 wires of the RJ45 cable, so I decided to connect the lasers to the GND for the LIM 0- switches.
> >
> > One of the lasers (L1) is connected between GND and Switch 1 (S1) and the other laser (L2) is connected between Switch 1 (S1) and Switch 2 (S2), see my "figure" below. Unfortunately it's not physically possible to have L2 connected between GND and S1. My thought was that L1 would be good no matter what state S1 and S2 is in. L2 would turn off if S1 is activated, but that wouldn't be a big deal.
> >
> > Problem: No matter if the relay driver (5V in my case) is switch on or off the S1 is always high as long as both lasers are connected. If I disconnect L2, S1 works again.
> >
> > I have checked every joints for bad connection, and cannot find any issue. L1 and L2 is connected exactly the same way. My multimeter shows a value of 1250 when checking the resistance over the laser itself (not really sure if that is the correct Ohm as the multimeter doesn't show correct Ohm over known resistors. It's a cheap Walmart multimeter btw).
> >
> > My very limited electronic knowledge leads me to think that the relay driver "acts" as a GND (in both on (5V) and off (0V) conditions) so that S1 becomes "invisible" to the LIM 0- pin.... ???
> >
> > Any help is appreciated!
> >
> > (GND)--------(S1)--------(S2)-------(LIM 0- pin)
> > | |
> > (L1)---------(L2)
> > |
> > (5V)
> >
> > Thanks,
> > Kristoffer
> >
> |
|
| Group: DynoMotion |
Message: 6710 |
From: Tom Kerekes |
Date: 2/12/2013 |
| Subject: Re: Issue with a small 5mW laser and a limit switch... |
Hi Kris,
Sorry I don't understand what you are trying to do or why you can't wire things normally.
I don't see where you have a Relay Driver. Make a drawing with Paint or something. Save it as a *.png file and attach it to your email or post.
Regards TK
| | | |
