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How to disable fan noisy Meanwell MP650
How to disable fan noisy Meanwell MP650
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Old 13th January 2018, 06:24 PM   #21
taita is offline taita  Netherlands
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Originally Posted by johnnyx View Post
Minebea has 4 models in the series, two have locked rotor signsls of the type I discussed, and 2 have a tacho output;- 2410ML-04W-B79-B00 Specs and Media - DC Axial Fans - NMB Technologies Corporation

A NE555 timer chip could be used to give a signal to fool it into thinking the fan was present.

Cheap Chinese 555 timer PCBs are available, and could be used with suitable modification.
This one for instance? NE555 PULSFREQUENTIE Duty Cycle Verstelbare Module Blokgolf Signaalgenerator in NE555 PULSFREQUENTIE Duty Cycle Verstelbare Module Blokgolf Signaalgenerator van Geintegreerde Schakelingen op AliExpress.com | Alibaba Groep

But how to fit the right signal?

I also found this thread. Generate Fan RPM Signal W/O Fan | [H]ard|Forum
They do exactly what I need don't you think?
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Old 13th January 2018, 10:33 PM   #22
Samsara is offline Samsara  France
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Find any 12V three wires FAN (from any computer for example), plug it instead the other, if it's OK break the blades.
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Old 13th January 2018, 10:36 PM   #23
nigelwright7557 is offline nigelwright7557  United Kingdom
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Originally Posted by Samsara View Post
Find any 12V three wires FAN (from any computer for example), plug it instead the other, if it's OK break the blades.
Make sure blades are broken of to exact same length or you might get serious vibration and noise.
You could cut them flush with the center bush with side cutters.
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Old 14th January 2018, 10:34 AM   #24
taita is offline taita  Netherlands
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Originally Posted by nigelwright7557 View Post
Make sure blades are broken of to exact same length or you might get serious vibration and noise.
You could cut them flush with the center bush with side cutters.
I'm afraid this is very difficult and the result will never be noiseless.

Quote:
Originally Posted by Nico Ras View Post
I had a similar problem .....
I found this piece of electronics that might be helpfull

PWM Pulse Frequency Duty Cycle Adjustable Module Square Wave Signal Generator | eBay

Adjustable frequency and square output. Power from the fan power supply, but should I use a resistance to match the output?

Last edited by taita; 14th January 2018 at 10:37 AM.
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Old 16th January 2018, 03:25 AM   #25
PRR is offline PRR  United States
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Loud how? Air or bearing?

Peel the label off the fan, there's a bearing. If the factory oil has gone hard, the bearing will squeal horribly. Sewing-machine 3-in-1 oil works.

Air: put 20 Ohms 10W in series with the 12V lead. Air-flow is down to about 1/4 and noise even more. Most fans will work at half-voltage. Many deaf-fan monitors won't care unless the fan just stops for more than a second.
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Old 1st February 2018, 12:01 PM   #26
taita is offline taita  Netherlands
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Originally Posted by taita View Post
I'm afraid this is very difficult and the result will never be noiseless.


I found this piece of electronics that might be helpfull

PWM Pulse Frequency Duty Cycle Adjustable Module Square Wave Signal Generator | eBay

Adjustable frequency and square output. Power from the fan power supply, but should I use a resistance to match the output?
Well, the pulsgenerator did it! At 1000 hz it mimics the fan and the power supply delivers 70V. Small investment of less than 3 euro's and it works. I won't miss the fan as I have tested the power supply loaded while the fan was boxed. Moreover it has temperature sensors that avoid overheating.

Thanks for all your suggestions.
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Old 4th February 2018, 02:48 PM   #27
mkane77g is offline mkane77g  United States
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How to disable fan noisy Meanwell MP650
Just where exactly is that generator connected to?
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Old 4th February 2018, 03:14 PM   #28
taita is offline taita  Netherlands
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Originally Posted by mkane77g View Post
Just where exactly is that generator connected to?
The fan is connected to the board with three wires. Black and red deliver 14 V that feed the pulsegenerator. The white wire is connected to the output (PWM).
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Old 4th February 2018, 03:57 PM   #29
mkane77g is offline mkane77g  United States
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How to disable fan noisy Meanwell MP650
thanks. And that board in the pic is the PWM board and I suppose I need one of those also.
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