Fan Test

Hi,


The following Fan was used in several of our prototype systems

http://www.mouser.com/ds/2/471/San_Ace_92LG25_E-541728.pdf


The thing is that one of the FAN in one of our systems broke down due to unknown reasons ( mechanical or electrical ) . The FAN ran 5000 cycles.

I send the FAN to the manufacturer and the manufacturer said that one of the IC on the FAN was burned out. But they did not know , how and why?

So, now I need to test the FANS so they can fail. My question is what is the best way to do testing.

I am planning to run several FANS ( quantity : 60) at the same times with +24 V DC and measure current. How many of these FANS should I test?

I will be using temperature chambers and mechanical stress fixtures. Should I also measure airflow if yes, then how?

jess

 

Il giorno lunedĂŹ 13 giugno 2016 02:37:55 UTC+2, jsscs...@gmail.com ha scritto:

> I will be using temperature chambers and mechanical stress fixtures. Should I also measure airflow if yes, then how?

IMHO air flow is not necessary, but measure current and speed. If current/and speed change from nominal (higher current and/or lower speed) then something in the motor is going to break very soon.

Bye Jack

 

Hi,

How can I measure the speed of the Fan?

jess

On Monday, June 13, 2016 at 4:51:59 AM UTC-4, jack...@gmail.com wrote:

Il giorno lunedĂŹ 13 giugno 2016 02:37:55 UTC+2, jsscs...@gmail.com ha scritto:

I will be using temperature chambers and mechanical stress fixtures. Should I also measure airflow if yes, then how?

IMHO air flow is not necessary, but measure current and speed. If current/and speed change from nominal (higher current and/or lower speed) then something in the motor is going to break very soon.

Bye Jack

 

On Sunday, June 12, 2016 at 8:37:55 PM UTC-4, jsscs...@gmail.com wrote:

Hi,


The following Fan was used in several of our prototype systems

http://www.mouser.com/ds/2/471/San_Ace_92LG25_E-541728.pdf


The thing is that one of the FAN in one of our systems broke down due to unknown reasons ( mechanical or electrical ) . The FAN ran 5000 cycles.

I send the FAN to the manufacturer and the manufacturer said that one of the IC on the FAN was burned out. But they did not know , how and why?

So, now I need to test the FANS so they can fail. My question is what is the best way to do testing.

I am planning to run several FANS ( quantity : 60) at the same times with +24 V DC and measure current. How many of these FANS should I test?

I will be using temperature chambers and mechanical stress fixtures. Should I also measure airflow if yes, then how?

jess

use photocell to count the blades passing.

 

On Sunday, June 12, 2016 at 8:37:55 PM UTC-4, jsscs...@gmail.com wrote:

Hi,


The following Fan was used in several of our prototype systems

http://www.mouser.com/ds/2/471/San_Ace_92LG25_E-541728.pdf


The thing is that one of the FAN in one of our systems broke down due to unknown reasons ( mechanical or electrical ) . The FAN ran 5000 cycles.

I send the FAN to the manufacturer and the manufacturer said that one of the IC on the FAN was burned out. But they did not know , how and why?

So, now I need to test the FANS so they can fail. My question is what is the best way to do testing.

I am planning to run several FANS ( quantity : 60) at the same times with +24 V DC and measure current. How many of these FANS should I test?

I will be using temperature chambers and mechanical stress fixtures. Should I also measure airflow if yes, then how?

jess

Here's a MIL standard for electric motors:
http://everyspec.com/MIL-STD/MIL-STD-1400-1499/MIL_STD_1412A_1245/

Look at method 403: Life expectancy.
It's for AC motors, but should give an idea of what and how to monitor.
Send me one, I'll do life test on it: www.4ctestsystems.com

 

Il giorno mercoledĂŹ 15 giugno 2016 03:13:19 UTC+2, sdey...@hotmail.com ha scritto:

On Sunday, June 12, 2016 at 8:37:55 PM UTC-4, jsscs...@gmail.com wrote:
Hi,


The following Fan was used in several of our prototype systems

http://www.mouser.com/ds/2/471/San_Ace_92LG25_E-541728.pdf


The thing is that one of the FAN in one of our systems broke down due to unknown reasons ( mechanical or electrical ) . The FAN ran 5000 cycles.

I send the FAN to the manufacturer and the manufacturer said that one of the IC on the FAN was burned out. But they did not know , how and why?

So, now I need to test the FANS so they can fail. My question is what is the best way to do testing.

I am planning to run several FANS ( quantity : 60) at the same times with +24 V DC and measure current. How many of these FANS should I test?

I will be using temperature chambers and mechanical stress fixtures. Should I also measure airflow if yes, then how?

jess

use photocell to count the blades passing.

these kind of fans may have a feedback signal that give the speed (PWM, square wave with speed proportional to frequency, ...). If it has it, then it's easy

Bye Jack

 

On Sunday, June 12, 2016 at 8:37:55 PM UTC-4, jsscs...@gmail.com wrote:

Hi,


The following Fan was used in several of our prototype systems

http://www.mouser.com/ds/2/471/San_Ace_92LG25_E-541728.pdf


The thing is that one of the FAN in one of our systems broke down due to unknown reasons ( mechanical or electrical ) . The FAN ran 5000 cycles.

I send the FAN to the manufacturer and the manufacturer said that one of the IC on the FAN was burned out. But they did not know , how and why?

So, now I need to test the FANS so they can fail. My question is what is the best way to do testing.

I am planning to run several FANS ( quantity : 60) at the same times with +24 V DC and measure current. How many of these FANS should I test?

I will be using temperature chambers and mechanical stress fixtures. Should I also measure airflow if yes, then how?

jess

But what are you going to do, run them till they die, how long will that take? Months, years? That why they test at accelerated levels, to simulate a few lifetimes in a few weeks. You need to run at elevated ambient temp, at least.
High humidity and heavy clogged air flow.

 

[default]

On Sun, 12 Jun 2016 17:37:52 -0700 (PDT), jsscshaw88@gmail.com wrote:

Hi,


The following Fan was used in several of our prototype systems

http://www.mouser.com/ds/2/471/San_Ace_92LG25_E-541728.pdf


The thing is that one of the FAN in one of our systems broke down due to unknown reasons ( mechanical or electrical ) . The FAN ran 5000 cycles.

I send the FAN to the manufacturer and the manufacturer said that one of the IC on the FAN was burned out. But they did not know , how and why?

So, now I need to test the FANS so they can fail. My question is what is the best way to do testing.

I am planning to run several FANS ( quantity : 60) at the same times with +24 V DC and measure current. How many of these FANS should I test?

I will be using temperature chambers and mechanical stress fixtures. Should I also measure airflow if yes, then how?

jess

You plan on testing 60 fans to destruction?

That sounds like a pretty ambitious, possibly costly, undertaking.
There's got to be a better way...

To test RPM a photo tachometer will do the job - most are hand-held
and hobby shops carry them to measure prop speed on model planes. But
if you want to monitor speed on 60 fans there may be some way to
measure current and count pulses. Small DC fans, energize the
internal coils in sequence - that draws power in pulses from the power
supply and those pulses can be measured and counted.

Many computer fans output a pulse just for that purpose or accept a
signal to adjust the speed.

But again there's bound to be a better approach. The manufacturer
should be the expert on testing their fans why not contact them for
their test procedures?

Some years ago I built a power supply to control a fan based on
temperature. I wasn't too concerned with absolute speed just so long
as the temperature didn't go too high (and I had progressive alarms
for that, one beep every 30 minutes if the ambient was 80F, 2 beeps @
85, etc. or continuous alarm to indicate a too high temp or bad
sensor)

 

[Jasen Betts]

On 2016-06-14, jsscshaw88@gmail.com <jsscshaw88@gmail.com> wrote:

Hi,

How can I measure the speed of the Fan?

if there's not a speed wire, shine a light through the blades,
measure the blink rate.




--
\_(ツ)_

 

[whit3rd]

On Tuesday, June 14, 2016 at 7:29:11 AM UTC-7, jsscs...@gmail.com wrote:

> How can I measure the speed of the Fan?

The data sheet says that's what the yellow wire is for.