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09-27-2019, 10:29 PM
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#61
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Senior Member
Join Date: Nov 2015
Location: Baytown, Texas
Trailer: 2017 21' Escape - upgraded version
Posts: 2,697
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Quote:
Originally Posted by FentonRees@ieee.org
From the get go with a new 2018 21ft, the Maxxfan has tripped off when operated at the minimum speed;- typically at night to help control condensation. This is very occasional, and if run continuously can take days to occur.
This occurs when we are plugged into shore power or operating on battery.
I have changed the control PCB out twice (once from Maxxfan and once from Escape) with the problem still present. So this is not a control board problem;- it is either how they work or something else is causing the issue.
MaxxFan told me about the max/min voltage limits (as noted by others);- but the max (13.5-ish) would not occur when on battery power, and minimum was unlikely as battery had good charge.
And yes, having a max rating of 13.5 on something designed for a RV is totally NUTS.
So if it is not a control board issue, and not the battery voltage, the only other item in the circuit is the motor. Does anyone think the motor could be doing something that causes this ? Changing out the motor is more of a pain than the control board, but do-able.
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Haven't seen someone with a IEEE.org address in a while. Had one while in college - used to hang out in the IEEE and study for exams.
If you had measured your trailer voltage on an interval basis, you would have found that the converter exceeds 13.5v on a regular basis. All it could take is one time of high voltage and the control board would not be the same.
"The WF-8955 model provides 55 Amps and a clean, constant 13.6 VDC nominal output.... Automatic three-stage charging extends the life of your battery with output voltage modes of 13.2 VDC range “float” mode, 13.6 VDC range “absorption” mode, and a 14.4 VDC range “bulk” charge mode. "
https://wfcoelectronics.com/product/wf-8955-55-amp/
And if you have a solar installation, all bets are off. Solar can put out higher voltages (absorption rate at 15.3 volts) than the WFCO.
Bulk charge or absorption mode will drive a Maxxfan control board crazy. After installing a voltage regulator, my Maxxfan has not had any hiccups since.
__________________
Normal people believe that if it ain't broke, don't fix it.
Engineers believe in fixing it so that it never breaks.
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09-28-2019, 07:15 AM
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#62
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Senior Member
Join Date: Mar 2016
Location: Burlington Twp., New Jersey
Trailer: 2010 Escape 19
Posts: 7,126
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Quote:
Originally Posted by FentonRees@ieee.org
From the get go with a new 2018 21ft, the Maxxfan has tripped off when operated at the minimum speed;- typically at night to help control condensation. This is very occasional, and if run continuously can take days to occur.
This occurs when we are plugged into shore power or operating on battery.
I have changed the control PCB out twice (once from Maxxfan and once from Escape) with the problem still present. So this is not a control board problem;- it is either how they work or something else is causing the issue.
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Is there any chance that you have the fan on “AUTO”? This would have the fan running at minimum (only increasing if cabin warms) and allow it to shut off when the selected temperature on the thermostat is reached (default is 78F...adjustable in 1F increments). I’m not sure of your temperatures and if you are also using the furnace but this seems possible with warm days and then the temperature falling through the night which is when you are indicating the issue is most apparent.
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11-25-2019, 07:50 PM
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#63
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Senior Member
Join Date: Oct 2016
Location: Carrollton, Texas
Trailer: 2017 Escape 21, 2017 Toyota Tundra 5.7L 4x4
Posts: 549
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Control board is good after all
I had an interesting situation. After my solar controller did an absorption charge at 15+ volts, my Maxxfan 7500K stopped working, even though it was not running at the time. It would not start by the button or the remote. I tried pulling the fuse and re-plugging it in but the fan still didn't work.
I took the Maxxfan apart and installed a 12volt regulator that Jon V gave me at the Niagara Falls rally earlier this year. I was going to order a new control board, but decided to wire the broken one to the 12 volt regulator and try it out. Guess what, the broken board started working. I have no idea as why, but I won't tell my wife. She will be so proud of me for repairing the fan without paying $50 for a new control board. I might even get lucky.
__________________
Rick and Vicky Reed
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11-25-2019, 08:14 PM
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#64
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Senior Member
Join Date: Aug 2015
Location: Benton County, Iowa
Trailer: 2013 Escape 21 Classic Number 6, pulled by 2018 Toyota Highlander
Posts: 8,235
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Jim Norman tells me that fresh, huge , Iowa garlic, is a sure fire way to get lucky. I’m not sure about this but I do know I’m not hauling any more into Canada or back into the States. Glad to know you got your fan working with significant monetary output. The free tarp has been very good. If you see rubber boots on the tarp make sure they are both the same size and a left and right foot. Some rookie tried to pass two left feet in sizes 10 and 11. Have a fine Thanksgiving.
Iowa Dave
__________________
Ain’t no trouble jacking a double Burma Shave
Dave
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04-20-2020, 07:07 PM
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#66
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Senior Member
Join Date: Oct 2017
Location: Kelowna, British Columbia
Trailer: 2018 Escape 19
Posts: 2,716
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I would like to place my voltage regular near the fuse panel. Do we know what else is on the fan circuit?
The regulator I am thinking of getting should cover most anything on a single circuit.
http://s.aliexpress.com/fMfmyaiU
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04-20-2020, 07:46 PM
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#67
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Senior Member
Join Date: Nov 2015
Location: Baytown, Texas
Trailer: 2017 21' Escape - upgraded version
Posts: 2,697
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Quote:
Originally Posted by Eggscape
I would like to place my voltage regular near the fuse panel. Do we know what else is on the fan circuit?
The regulator I am thinking of getting should cover most anything on a single circuit.
http://s.aliexpress.com/fMfmyaiU
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Escape seem to change the way they wire DC circuits a lot. The way I found out what was on my Maxxfan circuit was to pull the fuse and see what powered down.
On my trailer, it was all the overhead lights, the Maxxfan, and the bathroom lights and fan.
__________________
Normal people believe that if it ain't broke, don't fix it.
Engineers believe in fixing it so that it never breaks.
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04-20-2020, 08:24 PM
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#68
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Senior Member
Join Date: Nov 2015
Location: Baytown, Texas
Trailer: 2017 21' Escape - upgraded version
Posts: 2,697
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Quote:
Originally Posted by Eggscape
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That is a good price - here is the same buck regulator in Amazon.
https://www.amazon.com/dp/B0819Y8PJZ...kCode=osi&th=1
Here's something to keep in mind. The regulator you chose is a buck converter which means that the input voltage will always need be more than the outlet voltage and that difference is described as the dropout voltage. That's OK if the battery voltage is the dropout voltage higher than the output voltage you need - not so good if it is less.
Here's the interesting part - one of the reviewers stated that he could get 12v out with 13.5v in. That is a large dropout voltage but not uncommon for a regulator like this.
But it may make it totally unsuited for what you are wanting to do.
__________________
Normal people believe that if it ain't broke, don't fix it.
Engineers believe in fixing it so that it never breaks.
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04-20-2020, 09:12 PM
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#69
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Senior Member
Join Date: Oct 2017
Location: Kelowna, British Columbia
Trailer: 2018 Escape 19
Posts: 2,716
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You are right this will not do.
Have to get my head back into the game.
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04-20-2020, 09:34 PM
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#70
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Senior Member
Join Date: Nov 2015
Location: Baytown, Texas
Trailer: 2017 21' Escape - upgraded version
Posts: 2,697
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Quote:
Originally Posted by Eggscape
You are right this will not do.
Have to get my head back into the game.
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The 10a buck boost that I used is the lowest cost solution I could find.
https://www.ebay.com/itm/DC-DC-Conve...53.m1438.l2649
Here is a 13a that would work but the cost goes up.
https://www.ebay.com/itm/DC-DC-6V-32...0AAOSwsCdd5KCZ
__________________
Normal people believe that if it ain't broke, don't fix it.
Engineers believe in fixing it so that it never breaks.
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04-20-2020, 09:57 PM
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#71
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Senior Member
Join Date: Oct 2017
Location: Kelowna, British Columbia
Trailer: 2018 Escape 19
Posts: 2,716
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Thanks for link....I have also copied your installation instructions.
I was going over the previous pages and I am back on track.
Here in Canada eBay sellers want from $16.40 but most are over $20 with shipping so I will be ordering from AliExpress.
This one is shipped via ePacket which means when it hits Canada it will become priority post...so about 22 to 26 days.
http://s.aliexpress.com/eYbMJNjm
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04-20-2020, 10:07 PM
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#72
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Senior Member
Join Date: Nov 2015
Location: Baytown, Texas
Trailer: 2017 21' Escape - upgraded version
Posts: 2,697
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For those that want to install a voltage regulator for their furnace or hot water heater, I found these boxes that fit the buck boost regulator I bought from ebay.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
__________________
Normal people believe that if it ain't broke, don't fix it.
Engineers believe in fixing it so that it never breaks.
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