| Gallery, Projects and General > How do I?? |
| SX2 broke? |
| << < (3/5) > >> |
| lordedmond:
looks like that the cause and you have found a simple solution to the problem when I was working we spent months at the computer centre ( main frames 2 mega watt draw from the mains ) trying to sort out circulating current problems turned out to be a USA made and certified by IBM frequency changer in our case 50HZ to 408HZ ( may be wrong on that value it was over 20 years ago ) the problem was odd oder harmonics because the units being USA sourced were designed for 60 HZ thus the filtering was not up to snuff over here Glad you have it sorted Stuart |
| BaronJ:
--- Quote from: superc on March 28, 2014, 03:12:35 PM ---Yes it does have an auto igniter. I had a similar thought. Watching on the amp/watt meter every 20 seconds or so there is a current spike of about 0.2 amps. Without taking the heater apart I couldn't decide if it was the fuel pump, the electric eye sensor, or as u suggest the igniter. Since both machines work just fine when on different circuits the obvious, and simplest 'fix all' is to not use them both at the same time on the same circuit. It has to be a sub or secondary frequency causing the problem as the duty cycle of the house current remains unchanged. I lack the apparatus to tell if one device is generating a square wave while the other one uses/expects a sine wave or a triangular wave or a sawtooth wave or vice versa. Crest factors, form factors, RMS, all that gobbledygook. I know in theory while my meter is measuring the waves it expects to see, there could be when both devices are in play be two or more waves running through at the same time, but the meter will only notice the one, even if there is a wave of lesser height delivering a greater RMS value. In any case all that is pushing the limits of my understanding of things electric. Suffice to say the torpedo heater and the Mill's circuit board are not friends. So clearly keeping the devices on different circuits is the best solution. I have in the past had printed circuit boards become suddenly inoperative (i.e., dead forever) when expecting one type of wave an old generator of mine sent out some of the other types of wave. LoL, can we say; running, running, pfffft! --- End quote --- Almost certainly the heater is introducing spikes onto the mains and the Mill speed controller is sensitive to them ! Nothing wrong with either piece of equipment. Putting the heater on a different socket is adding additional inductance or capacitance into the circuit between the two enough to suppress them. There should be circuitry built into each piece of equipment to prevent that phenomena as required by various bits of legislation in various countries including the UK, USA, and most if not all Europe. |
| superc:
:D Gotta tell you, it all gave me a really bad moment when the first CLUNK and fault lights started happening. Visions of bearings failed or bad circuit boards or even debris caught in a fan belt ran through my mind along with the vision of what to dissect first. Truly was some luck involved. First, that the mill's circuit boards didn't just go pffft like another piece of equipment did long, long ago. Second, that I had no heater in the circuit on the day I turned it on one last time before beginning dissection. Third, that I made the connection between what is the now, and what was different then. Well the proposed legislation does sound nice, but I suspect the 30 year old torpedo heater won't give a hoot and will continue to dirty up the power lines. I think this problem is why some places I have worked have isolation transformers between different pieces of equipment. Seems strange to encounter a situation inside a home workshop where that might not be a terrible idea. Also noting Baron that you didn't add the home of Sieg, ie.e., China to the list of places where the legislation is being considered. :) |
| Bluechip:
Trouble with the usual wretched L/C line filter is they are not very good a stopping really narrow spikes. Presumably due to the self inductance of the X-Y caps and self capacitance of the chokes ... ? If you have problems just nail a 275VAC and > 80J MOV across the mill AC input, ( assuming you are on 240VAC ). Cheap enough, about 70c or 50p in UK. Similar to this: http://uk.farnell.com/littelfuse/v275la40ap/varistor-140j-275vac/dp/1057203 They do tend to snuff it over time. One machine I worked on we were supposed to replace them once a year ... Don't know if anyone ever did but it was scheduled ... Me? No, I never did ... :lol: Dave |
| superc:
No it is a 110-120 V AC Mill. Supposed to be a 120V 60 Hz line. Yes, sometimes it is. The UPS on this computer says the power company is supplying 122-127 volts today. |
| Navigation |
| Message Index |
| Next page |
| Previous page |