Re: [Emc-users] Damaged an SSR
On 1/1/24 11:38, Alan Condit wrote: Hi Gene, I had already tested my Router (also a Hitachi mv12) in a different circuit and knew it was working. The SSR that went bye-bye was one that I bought several years ago (used on EBay). So, after your reply, I checked the signal from the 7i76e to the SSR and (thank goodness) it was good. So I just went ahead and replaced the SSR with a new one. Now everything is working. This SSR is just controlling a line outlet. I had been using the old one for sometime without any problems. I have never tripped a breaker. The line into the cabinet feeds an SE600-48v switcher, a small 5v supply, a small 24v supply and the SSR controlled line outlet. Thanks, Alan *From: *gene heskett *Subject: **Re: [Emc-users] Damaged an SSR* *Date: *December 31, 2023 at 1:42:07 PM CST *To: *emc-users@lists.sourceforge.net On 12/31/23 12:50, condit.alan--- via Emc-users wrote: I was using an SSR to turn on the spindle on my PCBMill. By mistake I reached over and turned off the switch on the router while it was turned on. When I tried to turn it back on, it no longer worked. I am hoping that I just blew out the SSR and not the 7i76e. I have a spare SSR. Is there any precaution I should take for the future? The only scenario I can imagine is only valid if the router has a soft start circuit like a hitachi mv12 has. Turning it back on before it got stopped might damage that circuit in the router. Does it work from its own switch if plugged straight into the line? I use big HoymC or Crydom SSR's all over the place but I also trigger them on-off in sequence from timers in my .hal files. Usually in an attempt to start motor supplies which if just slammed with a mechanical switch, will instantly clear a 30 amp breaker from the turn on in-rush, so when I do an on, they get power for the first 4 seconds thru a 50 ohm 200 watt resistor that a second SSR shorts out 4 seconds later after the filters are pretty well charged. With the motor itself limited to about 2x nameplate FLA, I can run my cnc'd G0704 on a legal for 10 gauge wire, 20 amp breaker. At turn off I throw the big resistor back in series for a second then drop the other SSR to turn it all off. Been doing that w/o any SSR failures I caused for about a decade. Had a nearby lightning strike blow one of then to the permanently on state, the only failure I've had. Does it still work if plugged in direct? And if the SSR is switching a duplex does a test lamp work plugged in beside the router? Alan Chuckle. I went a little overboard when I was making a supply for the spindle motor on a G0704, which is a dressed up treadmill motor rated at 1hp at 90 volts and 9.7 amps grizzly was abusing with a cheap SCR based controller. So I raided one of my ex employees for some of his unfinished projects and came away with some big toroid transformers and a grocery sack of 6500 uf 65 volt caps, basically making a stacked pair of 63 volt supplies using about 16 of the caps for about 124 volts to run the motor with, a good solid src to feed one of the PICO pwm-servo drivers with. switching all that on along with the inrush of a couple big stepper supplies all at once, crowbars a 30 amp breaker in the service box that feeds just that 4 plex. So I had to stage the turn-on by switching the power with a 60 amp SSR feeding a 50 ohm 200 watt resistor in series with the line, charging all those caps a bit more gently, then 4 seconds later, its safe to turn on another SSR that shorts the 50 ohm. I now do the same thing with a 70 ohm 50 watt resistor to soften the switchers inrush. The pwm-servo current limits at around 18 amps if the motor gets hung, and a NEC legal 20 amp breaker in that slot of the service stays up. The whole thing works so silently and well that my only clue the motor is about to stall, is the squeak of the iron in the motor when that 18 amp limit kicks in. No slowdown or other change in the sound of its running prior to that point, and I'm getting at least 3.5 horses out of it. For close to a decade now. Why I haven't chewed up the gears in the mill head is beyond me, the gears are nylon! That controller is a 4 quadrant controller. And I enjoy doing tricks in hal, one of which is the use of a mux-4, which if it doing 3000 revs I can reach up and turn the gears shift knob, which untally's the gear its in which brings the motor down to about 30 rpm before I can tyurn the knob another 10 degrees, so I can switch gears while its running at full song but while I'm turning the gear shift knob its just creeping, too slow to hurt anything the other gear meshes perfectly without me having to grb the spindle and turn it till the gears engage, then in the last degree to the stop, the tally switch for that gear closes and 150 milliseconds later the spindle is turning 1500 revs in low gear. Similar hal trickery also allows the spindle to reverse when rigid tapping in under 400
Re: [Emc-users] Damaged an SSR
Hi Gene, I had already tested my Router (also a Hitachi mv12) in a different circuit and knew it was working. The SSR that went bye-bye was one that I bought several years ago (used on EBay). So, after your reply, I checked the signal from the 7i76e to the SSR and (thank goodness) it was good. So I just went ahead and replaced the SSR with a new one. Now everything is working. This SSR is just controlling a line outlet. I had been using the old one for sometime without any problems. I have never tripped a breaker. The line into the cabinet feeds an SE600-48v switcher, a small 5v supply, a small 24v supply and the SSR controlled line outlet. Thanks, Alan > From: gene heskett > Subject: Re: [Emc-users] Damaged an SSR > Date: December 31, 2023 at 1:42:07 PM CST > To: emc-users@lists.sourceforge.net > > > On 12/31/23 12:50, condit.alan--- via Emc-users wrote: >> I was using an SSR to turn on the spindle on my PCBMill. By mistake I >> reached over and turned off the switch on the router while it was turned on. >> When I tried to turn it back on, it no longer worked. I am hoping that I >> just blew out the SSR and not the 7i76e. I have a spare SSR. Is there any >> precaution I should take for the future? > The only scenario I can imagine is only valid if the router has a soft start > circuit like a hitachi mv12 has. Turning it back on before it got stopped > might damage that circuit in the router. Does it work from its own switch if > plugged straight into the line? > > I use big HoymC or Crydom SSR's all over the place but I also trigger them > on-off in sequence from timers in my .hal files. Usually in an attempt to > start motor supplies which if just slammed with a mechanical switch, will > instantly clear a 30 amp breaker from the turn on in-rush, so when I do an > on, they get power for the first 4 seconds thru a 50 ohm 200 watt resistor > that a second SSR shorts out 4 seconds later after the filters are pretty > well charged. With the motor itself limited to about 2x nameplate FLA, I can > run my cnc'd G0704 on a legal for 10 gauge wire, 20 amp breaker. At turn off > I throw the big resistor back in series for a second then drop the other SSR > to turn it all off. Been doing that w/o any SSR failures I caused for about a > decade. Had a nearby lightning strike blow one of then to the permanently on > state, the only failure I've had. > > Does it still work if plugged in direct? And if the SSR is switching a > duplex does a test lamp work plugged in beside the router? > >> Alan >> Sent from my iPhone >> ___ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> . > > Cheers, Gene Heskett. ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Damaged an SSR
On 12/31/23 12:50, condit.alan--- via Emc-users wrote: I was using an SSR to turn on the spindle on my PCBMill. By mistake I reached over and turned off the switch on the router while it was turned on. When I tried to turn it back on, it no longer worked. I am hoping that I just blew out the SSR and not the 7i76e. I have a spare SSR. Is there any precaution I should take for the future? The only scenario I can imagine is only valid if the router has a soft start circuit like a hitachi mv12 has. Turning it back on before it got stopped might damage that circuit in the router. Does it work from its own switch if plugged straight into the line? I use big HoymC or Crydom SSR's all over the place but I also trigger them on-off in sequence from timers in my .hal files. Usually in an attempt to start motor supplies which if just slammed with a mechanical switch, will instantly clear a 30 amp breaker from the turn on in-rush, so when I do an on, they get power for the first 4 seconds thru a 50 ohm 200 watt resistor that a second SSR shorts out 4 seconds later after the filters are pretty well charged. With the motor itself limited to about 2x nameplate FLA, I can run my cnc'd G0704 on a legal for 10 gauge wire, 20 amp breaker. At turn off I throw the big resistor back in series for a second then drop the other SSR to turn it all off. Been doing that w/o any SSR failures I caused for about a decade. Had a nearby lightning strike blow one of then to the permanently on state, the only failure I've had. Does it still work if plugged in direct? And if the SSR is switching a duplex does a test lamp work plugged in beside the router? Alan Sent from my iPhone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users . Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Damaged an SSR
I was using an SSR to turn on the spindle on my PCBMill. By mistake I reached over and turned off the switch on the router while it was turned on. When I tried to turn it back on, it no longer worked. I am hoping that I just blew out the SSR and not the 7i76e. I have a spare SSR. Is there any precaution I should take for the future? Alan Sent from my iPhone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
