How effective is an Empeg Fan? Just look.

Posted by: woops

How effective is an Empeg Fan? Just look. - 12/11/2004 01:41

Using Hijack's "High Temperature Warning Screen" gave the following:

Empeg just turned on: 68 degrees
Empeg normal operation: 100 degrees

After 100 degree reading stabilized, Turned the 2.25" x 2.25" x .4" fan mounted on top of emgeg powered by an Emco Regulated Power Supply on for probably less than 10 minutes: 77 degrees

nice.
Posted by: loren

Re: How effective is an Empeg Fan? Just look. - 13/11/2004 01:22

I was just about to post about this. I did a 10 hour drive today, and my empeg still went over 55C. It seemed to stabalize at about 57C, but the fan didn't work as well as i'd have hoped in car. So the empeg spent most of the trip 2 degrees over spec.

Which reminds me... Mark... Is there any way you could have some sort of notification in Hijack if the fan is ON? It's pretty much impossible for me to tell if it's even working while driving... Maybe just a flashing F in the temp window or something?
Posted by: woops

Re: How effective is an Empeg Fan? Just look. - 13/11/2004 02:08

Loren,

for the above test i pulled a fan off an amd heatsink. It is 2.4" square with 9 blades and really throws some air, its a
Thermaltake Model A6010S12C
12V
0.16 amps
29.5 dBA
19.7 CFM

i looked up the CF-86:
about 5 CFM @ 25 dBA <- can you verify this?
Posted by: tfabris

Re: How effective is an Empeg Fan? Just look. - 13/11/2004 02:55

Quote:
I did a 10 hour drive today, and my empeg still went over 55C.


Are any of the following a potential factor?

- Heater in the car turned on, with heating ducts running near player?

- Player is mounted below another stereo unit so that fan has no space to exhaust into?

- Player is in a cramped area in the dash so there is no intake air space on the rear sides?
Posted by: Daria

Re: How effective is an Empeg Fan? Just look. - 13/11/2004 03:58

Well, robricc seems to have found several new recruits.

Oh, not that kind of fan.
Posted by: mlord

Re: How effective is an Empeg Fan? Just look. - 15/11/2004 00:07

It's a completely hardware controlled fan -- Hijack doesn't get involved with it, other than programming the hi/lo thermostat registers at startup.

I don't know if Hijack could read the (theoretical) fan state, but likely it could. I do know that Hijack *could* read the temperature from the controller (which will differ from the temperature read from the empeg mainboard). But it currently does not.

Cheers
Posted by: mdavey

Re: How effective is an Empeg Fan? Just look. - 15/11/2004 02:13

Quote:
...if Hijack could read the (theoretical) fan state


Needs to read the DS1721 confiburation/status register and examine bit 1 (POL), which represents Tcom/Tout.

Quote:
Hijack *could* read the temperature from the controller


Needs to read the DS1721 temperature register. Unless anyone feels the need for multiple temperatures, probably the easiest way to do things is to have a config.ini entry that determines whether the Empeg temperature is derived from the on-board thermostat or the DS1721.

I'd be happy to take an initial look at all this, no promisies yet though.
Posted by: loren

Re: How effective is an Empeg Fan? Just look. - 19/11/2004 20:46

Quote:
- Heater in the car turned on, with heating ducts running near player?

nope.

Quote:
- Player is mounted below another stereo unit so that fan has no space to exhaust into?

nope. It's mounted under a pocket, which has holes drilled in it for ventilation

Quote:
- Player is in a cramped area in the dash so there is no intake air space on the rear sides?

there's definitely no ventilation on the sides. the sled and mounting brackets prevent this.

I don't think the fan's working. It spins up when the empeg boots, but turns off and doesn't come back on. It worked for a while when I was playing with it at home, but even with the config.ini settings telling it to turn on at 20 C it's not coming on in car. Ideas? I wanna try and fix it before I leave for home next week.