Re: [Emc-users] Another crazy idea?

On Monday 11 January 2016 14:44:54 John Kasunich wrote: > On Mon, Jan 11, 2016, at 02:00 PM, Gene Heskett wrote: > > On Monday 11 January 2016 13:10:10 John Kasunich wrote: > > > SSRs can fail shorted, I don't think this buys you much in terms > > > of reliability and safety. > > > > > > I think

Re: [Emc-users] Another crazy idea?

On Monday 11 January 2016 13:33:22 Bertho Stultiens wrote: > On 01/11/2016 06:01 PM, Gene Heskett wrote: > > 1. put a small tranny delivering say 6 volts AC in series with the > > resistor and its shorting SSR to encourage that SSR to turn off when > > the cap voltage has dropped to 6 volts or

Re: [Emc-users] Another crazy idea?

On 11.01.16 14:00, Gene Heskett wrote: > > I actually have, atm, 6 ea 5k 10 watters in parallel clipped onto it > right now that I was going to use once the relays get here. Thats 833 > ohms which would drain it even faster than just the one. And, somewhere > on an undermanned galley in the

Re: [Emc-users] Another crazy idea?

On Monday 11 January 2016 21:07:35 John Kasunich wrote: > On Mon, Jan 11, 2016, at 05:41 PM, Gene Heskett wrote: > > On Monday 11 January 2016 14:44:54 John Kasunich wrote: > > > On Mon, Jan 11, 2016, at 02:00 PM, Gene Heskett wrote: > > > > On Monday 11 January 2016 13:10:10 John Kasunich wrote:

Re: [Emc-users] Another crazy idea?

On Mon, Jan 11, 2016, at 05:41 PM, Gene Heskett wrote: > On Monday 11 January 2016 14:44:54 John Kasunich wrote: > > > On Mon, Jan 11, 2016, at 02:00 PM, Gene Heskett wrote: > > > On Monday 11 January 2016 13:10:10 John Kasunich wrote: > > > I actually have, atm, 6 ea 5k 10 watters in parallel

Re: [Emc-users] Another crazy idea?

On Tuesday 12 January 2016 00:37:55 Erik Christiansen wrote: > On 11.01.16 14:00, Gene Heskett wrote: > > I actually have, atm, 6 ea 5k 10 watters in parallel clipped onto it > > right now that I was going to use once the relays get here. Thats > > 833 ohms which would drain it even faster than

Re: [Emc-users] Another crazy idea?

On Friday 08 January 2016 23:44:43 Gene Heskett wrote: > On Thursday 07 January 2016 05:27:09 Gene Heskett wrote: > > On Thursday 07 January 2016 05:07:25 Gene Heskett wrote: > > > On Thursday 07 January 2016 04:50:35 andy pugh wrote: > > > > On 7 January 2016 at 03:32, Gene Heskett

Re: [Emc-users] Another crazy idea?

SSRs can fail shorted, I don't think this buys you much in terms of reliability and safety. I think there is a little over-kill going on. Do you really need a fast bleeder (<1 minute to safe)? Or would a five minute bleeder be OK? My understanding is that you have two 68000uF caps in series,

Re: [Emc-users] Another crazy idea?

On Monday 11 January 2016 13:10:10 John Kasunich wrote: > SSRs can fail shorted, I don't think this buys you much in terms of > reliability and safety. > > I think there is a little over-kill going on. > > Do you really need a fast bleeder (<1 minute to safe)? Or would a > five minute bleeder be

Re: [Emc-users] Another crazy idea?

On 01/11/2016 06:01 PM, Gene Heskett wrote: > 1. put a small tranny delivering say 6 volts AC in series with the > resistor and its shorting SSR to encourage that SSR to turn off when the > cap voltage has dropped to 6 volts or less. How do you connect the 6V AC without it bearing a huge (peak)

Re: [Emc-users] Another crazy idea?

On Mon, Jan 11, 2016, at 02:00 PM, Gene Heskett wrote: > On Monday 11 January 2016 13:10:10 John Kasunich wrote: > > > SSRs can fail shorted, I don't think this buys you much in terms of > > reliability and safety. > > > > I think there is a little over-kill going on. > > > > Do you really need

Re: [Emc-users] Another crazy idea?

On Thursday 07 January 2016 05:27:09 Gene Heskett wrote: > On Thursday 07 January 2016 05:07:25 Gene Heskett wrote: > > On Thursday 07 January 2016 04:50:35 andy pugh wrote: > > > On 7 January 2016 at 03:32, Gene Heskett wrote: > > > >

Re: [Emc-users] Another crazy idea?

On Thursday 07 January 2016 05:07:25 Gene Heskett wrote: > On Thursday 07 January 2016 04:50:35 andy pugh wrote: > > On 7 January 2016 at 03:32, Gene Heskett wrote: > > > > >-1 > > >

Re: [Emc-users] Another crazy idea?

On 6 January 2016 at 02:05, Gene Heskett wrote: > What do you think? Is that a safe and workable idea? I have seen NC SSRs. I don't know how they do it, and they are expensive. I have been using normally-closed mechanical relays to do this, with a 240V coil connected to

Re: [Emc-users] Another crazy idea?

On Wednesday 06 January 2016 05:13:34 andy pugh wrote: > On 6 January 2016 at 02:05, Gene Heskett wrote: > > What do you think? Is that a safe and workable idea? > > I have seen NC SSRs. I don't know how they do it, and they are > expensive. > > I have been using

Re: [Emc-users] Another crazy idea?

On Wednesday 06 January 2016 02:36:57 Bertho Stultiens wrote: > On 01/06/2016 03:05 AM, Gene Heskett wrote: > [snip] > > > The idea being that when that drain goes low, it will charge the > > .22, thru the diode, essentially maintaining that charge state. But > > when LCNC is stopped, that drain

Re: [Emc-users] Another crazy idea?

On 6 January 2016 at 14:01, Gene Heskett wrote: >> Ideally it needs to be a force-guided relay, with the main power feed >> (or surrogate thereof) through a second set of terminals > That thought has crossed my mind too, but the power relays I have, with > an aux set of

Re: [Emc-users] Another crazy idea?

On Wednesday 06 January 2016 09:21:48 andy pugh wrote: > On 6 January 2016 at 14:01, Gene Heskett wrote: > >> Ideally it needs to be a force-guided relay, with the main power > >> feed (or surrogate thereof) through a second set of terminals > > > > That thought has crossed my

Re: [Emc-users] Another crazy idea?

On 6 January 2016 at 14:43, Gene Heskett wrote: >> It is _not_ rated to switch 300V DC, so I just ensure it is never >> asked to switch when there is 300V across it. Or, in fact, more than >> 5V. > > Is it big enough to not weld closed forever? It is rated at 6A, so has no

Re: [Emc-users] Another crazy idea?

On Wednesday 06 January 2016 10:33:58 andy pugh wrote: > On 6 January 2016 at 14:43, Gene Heskett wrote: > >> It is _not_ rated to switch 300V DC, so I just ensure it is never > >> asked to switch when there is 300V across it. Or, in fact, more > >> than 5V. > > > > Is it big

Re: [Emc-users] Another crazy idea?

On 01/06/2016 10:13 PM, Gene Heskett wrote: [snip] >> This setup is probably also cheaper than using SSRs. > Perhaps, but your parts count is many times what I have in mind. But then again, the components are small and cheap. The setup you described would probably use more space. [snip] > So if

Re: [Emc-users] Another crazy idea?

On Wednesday 06 January 2016 17:05:27 Bertho Stultiens wrote: > On 01/06/2016 10:13 PM, Gene Heskett wrote: > [snip] > > >> This setup is probably also cheaper than using SSRs. > > > > Perhaps, but your parts count is many times what I have in mind. > > But then again, the components are small

Re: [Emc-users] Another crazy idea?

On 01/06/2016 01:54 PM, Gene Heskett wrote: >> When you turn off the machine and the SSR starts to bleed, and then >> turn on the machine before the caps are completely empty, then you >> will have the bleeder load on there permanently. > > Exactly the reason for the forced time delay in the turn

Re: [Emc-users] Another crazy idea?

On Wednesday 06 January 2016 15:10:55 Bertho Stultiens wrote: > On 01/06/2016 01:54 PM, Gene Heskett wrote: > >> When you turn off the machine and the SSR starts to bleed, and then > >> turn on the machine before the caps are completely empty, then you > >> will have the bleeder load on there

Re: [Emc-users] Another crazy idea?

On 01/06/2016 03:05 AM, Gene Heskett wrote: [snip] > The idea being that when that drain goes low, it will charge the .22, > thru the diode, essentially maintaining that charge state. But when > LCNC is stopped, that drain will go high (to 25 volts) as the supply is > turned off, and as it

[Emc-users] Another crazy idea?

Greetings everybody; I have the soft start working, but have found that the capacitors are forming up to a very low leakage since they are operating at about half to 1 volt above their labeled voltage, which if it was turned on every day, the inrush probably would not trip a 15 amp breaker.