I agree and never purchased an internal spray fluxer for the Electrovert Electras. We had the foam fluxer for OA flux and the external spray fluxer for the No-Clean process. I had a sealed cover made for the foam fluxer so that when it wasn't used it was covered. You don't want cross contamination from No-Clean flux dripping into the foam fluxer.
The USI ultrasonic spr ay fluxers were installed outside the machine in their enclosure with a filter overhead with its separate vent.
The Elec tras had the extended rails so the spra y fluxer slides under the conveyor and the filtered hood and sides cover the fluxer area.
The spra y fluxer only sprays a controlled mount starting at the beginning of the board or wave pallet and stopping at the end or an inch from the rear of the wave pallet. The side to side travel is also controlled so your not spaying all over the rails except of course if your not using wave pallets.
- The operators must be instru cted to operate the spray fluxer with the hood closed, any over spray is caught by the filter which we clean every week.
- There was problem in the beginning and cleaning and maintenance was increased when some operators were running with the safety hood up to see the spray fluxer working and the pallets were staying in the conveyor fingers, especially with an automat ed system feeding the wave solder line. A differnet subject for another day.
- The stainless steel switch, up in the vent, is connect ed fire suppression system and the wave's safety interlock system.
The battery backup option will allow the conveyor and PC to work to get the boards out.
The wave solder machine also has a vent sensor to detect that the established ventillation requirement is met.
If there is a motor failure in the main vent system that draws from all three vents then the alarm will sound but not shut down the system unless you have the alarm software set to hard alarm versus soft alarm. With the soft alarm mode y ou can unload the boards from the system and shu t it down and do the required PM. W ith the Hard S top A larm you'd have to open up the preheater covers and pull the boards out, loosing the unsoldered parts, just horrible and not something you want to do.
W ith alcohol based fluxes there is no flux dripping onto the 1st preheater if your spraying the correct amount.
W ith No-Clean water based fluxes there definately is a lot of flux dripping onto the plate of the Electra wave before the 1st preheater and a little that actually drops onto the 1st preheater when your using selective solder pallets.
Aluminum foil placed o ver the flat spacer plate is easier to replace at the end of the week than scraping the plate clean. With the water based flux, VOC-Free) The cold flux can hit the thermocouple on the convection prehater and cause a false alarm where it detects that the temperature of the whole heater is out of spec. A convection heater is a lot cooler than the rods of an IR heater and the air flow has many benefits.
The Vitronic Delta series, as I recall the spray fluxer was internal, I remeber how hoard it was to get the gauges and solenoids.
We never had a problem with them. On the MySelective robotic type solder system, it had a programmabel bubblejet spra y fluxers to spray the individual joints.
We were using alcohol based flux at that company and never had a problem and cleaning was easy enough.
----- Original Message -----
From: "Richard D. Stadem" <[log in to unmask]>
To: [log in to unmask]
Sent: Tuesday, September 6, 2011 2:19:33 PM
Subject: Re: [TN] Spray fluxer for wave machines
Besides the cleaning issues, the other bad part of having flux ultrasonically sprayed inside of the wave solder machine is this:
The exhaust to the machine must be on when the pot is on, ie, hard-wired to the pot on/off switch. This is an OSHA requirement. This requirement is the result of chimney fires from the pot being on with no exhaust. The heat from the pot still goes up the chimney, but without the benefit of the exhaust blower being on, the flux flux residues inside the chimney melt and drop down into the pot and ignite. This starts a chimney fire, and once the flux gets to burning, it is a very hot fire that is almost impossible to extinguish.
So if you do use an ultrasonic sprayer, it is better that it is in its own separate housing or fluxing unit just prior to entering the machine. Else be sure to clean the exhaust stack at least twice per year.
The flux will also get all over the infrared preheater lamps and bake on such that it is very difficult to clean, and will reduce the efficiency of the lamps.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Tuesday, September 06, 2011 12:29 PM
To: [log in to unmask]
Subject: Re: [TN] Spray fluxer for wave machines
The only spray fluxer I have used was an external box. I echo Steve's
comment.
It didn't make it into the machine as is was separated by a short conveyor.
However, the flux did get into the exhaust system. It did some damage to the
cage fan.
Cleaning the fan and housing was . . . unpleasant.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, September 06, 2011 10:29 AM
To: [log in to unmask]
Subject: Re: [TN] Spray fluxer for wave machines
Hi Ioan,
I'll give you some feedback. The one thing I don't like about Ultrasonic
spray fluxers is that they seem to atomize the flux into droplets into such
a fine mist, that it turns the flux into a fog almost. Which over time will
deposit the flux all over inside the machine. I know that people don't use
RMA fluxes like they used to, but the last Technical Devices wave machine I
worked with had a USI Optiflux spray fluxer and we did use RMA flux, and the
flux found places inside the machine that were very difficult to clean...it
was a sticky, icky, gooey mess. The Electrovert Electra that I worked with
before that one also had a USI ultrasonic fluxer, and we had the same issue.
I found a spray fluxer that I liked. It was the one that came with the
Vitronics/Soltec Delta 5 machine. It was a compressed air spray fluxer. The
droplets aren't as fine as in a ultrasonic spray fluxer and don't go all
over the machine. I also felt that you got better flux penetration in the
PTH on thicker boards with a compressed air spray fluxer than you do with a
US system. I don't know if you can buy the fluxer that they have in the
Vitronic/Soltec machines as a stand-alone unit or not, but I did come across
a ERSA spray fluxer that you can buy as a stand-alone unit:
http://tinyurl.com/4ycs7uy
From the picture of the flux tray in the *.pdf above, it looks a lot like
the fluxer in the Vitronics/Soltec, but I'm not sure.
I'm sure that there are a lot of people happy with ultrasonic spray fluxers,
but I don't like 'em...
My .02¢,
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Tuesday, September 06, 2011 9:05 AM
To: [log in to unmask]
Subject: Re: [TN] Spray fluxer for wave machines
Hello again,
I would really appreciate some insights on this, as I didn't get too many
answers!
Thanks,
Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask] <mailto:[log in to unmask]>
W | www.digico.cc <http://www.digico.cc/>
N'imprimer que si nécessaire - Print only if you must
De : Ioan Tempea
Envoyé : September-01-11 9:31 AM
À : 'TechNet E-Mail Forum'
Objet : Spray fluxer for wave machines
Dear Technos,
We are looking into buying a wave machine and trying to figure out the best
spray fluxer that has to go with it. I guess we're looking at the usual
suspects, USI and SonoTek. What is your feedback on their fluxers? I guess
off line answers are appropriate, so, please, do not hesitate to share your
experiences with me.
Thanks,
Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask] <mailto:[log in to unmask]>
W | www.digico.cc <http://www.digico.cc/>
N'imprimer que si nécessaire - Print only if you must
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