Tagan FAQ (Frequently Asked Questions)
1. Can I use Tagan power supply to control any extra outside-fans and how to connect it ?
2. What is indeed the meaning of PS2 in the description of power supply ?
3. Why Tagan power supply does not transport so strongly the warm air from inside the PC-case ?
4. Why Tagan using two fans ?
5. Why Tagan does not use one big 12cm Single-Fan-blower ?
6. What is indeed the meaning of ATX ?
7. Why the TSCT-Curve (Tagan Silence Control Technology) not showing the dependency of the Temperature – but of the Load percentage ??
8. Why after switching-on the Tagan power supply only 1 fan running?

1. Can I use Tagan power supply to control any extra outside-fans and how to connect it ?
Answer : No, it has no sense, because the thermal-sensor is lying inside the power supply. This sensor measures and controls only the inside temperature of the power supply, but not the outside temperature anywhere else in the PC-case; therefore, it is no sense to connect and control any external fan in PC-case.

2. What is indeed the meaning of PS2 in the description of power supply ?
Answer : It is subject to the history. In the early time (ca. 15 years ago) IBM had brought into the market the so-called “PS2- computers” (flat desktops) with special unique components and dimensions (like PS2 mouse, PS2 keyboard, PS2 cards for special PS2 slots as well as PS2 power supply). It was a flop, because the PS2 components were only available from IBM but not in the free common market. Anyway, the specified compact standards of PS2 form-factors and dimensions are kept and still be used up to nowadays (e.g. PS2 mouse, PS2 keyboard and also PS2 power supply). Note : PS2 power supplies have a defined standard specification in height and width (ca. 86mm x 152mm) as well as the placement of the 4 (four) holes of the screws for fixing, but the depth is varying and not exactly held by many manufacturers, e.g. PSU for industrial IPC or server applications.

4. Why Tagan using two fans ?
Answer : Two fan-blowers have the tasks, that one fan (backside, inlet) always sucking in and the other one (frontside, outlet) always blowing out. The air-flow resistance (due to the components lying between) is easier to be bridged over by using 2 fans; in case of too big resistance the air-flow can be interrupted and in the worse-case can even be turned back (so-called “back-pressure”), which is very disadvantageous for the heat-dissipation.

5. Why Tagan does not use one big 12cm Single-Fan-blower ?
Answer : There is no advantage against the 180° dual-fans ?push-pull“-Technology, which can produce the so-called “laminar flow“ (a roughly straight and parallel air-flow from inlet to outlet). Disadvantageous of 12cm single-fan is that the fan can only be built into 90° direction, which also force the air-flow path to be 90° bent (flow turbulence), and besides of it also need free space in the power supply height, consequently the height of the heat-sinks must also be reduced. But lesser heat-sink mass (due to height reduction) results in lesser capability of conveying heat-dissipation. Another disadvantage of 90° fan-technology is that, when part of the heated air (through the dedicated holes on the backside) blown out again into the PC-case; this causes the so-called “ thermal short-circuit ”, if the heated air over and over be sucked again through the inlet.

6. What is indeed the meaning of ATX ?
Answer : AT =: Advanced Technology (oldest, no more used) ATX =: Advanced Technology Extended (mostly used untill today) BTX =: Balanced Technology Extended (new, in the future) History : AT a ATX a BTX
These specifications define not only the form-factors, dimensions etc. but also the power supply required; therefore the name “ATX PowerSupply”. Extension of ATX PowerSupply-Specification: ATX a ATX12V (with extension of the 12V-rails, e.g. extra 4-pin for P4) ATX12V Mainboard-connectors : 20-pin + 4 (Single-CPU-M/B) or : 24-pin + 8 (Dual-CPUs M/B or higher) Important : The ATX12V 24-pin connector is similar and compatible to SSI / EPS12V , which having the same 24-pin connector (exception: without –5VDC on Pin#21, NC: No Connection) TG480-U01 (w/ 24-pin +8-pin) can therefore be used as EPS12V power supply ! Glossary : SSI : S erver S ystem I nfrastructure EPS : E ntry-level P ower S upply EPS12V : E ntry Non-redundant P ower S upply (w/ +12V extension) ERP12V : E ntry R edundant P ower S upply (more in: http://www.ssiforum.org/html/adoptedspecs.asp )

7. Why the TSCT-Curve (Tagan Silence Control Technology) not showing the dependency of the Temperature – but of the Load percentage ??
Answer : Temperature is an indirect result of the energy loss in form of heat (so-called heat-dissipation – electrical to thermal loss). The total energy loss of power supply depends strongly on its efficiency and the actual loads on its DC-outputs. By controlling the air-flow / air-convection the heat energy loss should be as soon as possible conveyed out from inside the power supply, to guarantee the heat-balance and the optimum of mean temperature inside the power supply. In detail each value of the temperature depends also on what kind of components and its location. Power components, like power-diode, MOSFET, HV-transistor etc. producing the most local energy loss (so-called “hot-spots”), which - through the built-in heat-sinks of appropriate dimension and large surfaces - should be conducted and over its surface conveyed out by the air-convection. It has therefore a sense that TSCT-curve showing the dependency on the load than on the temperature , because the energy loss is proportional to the loads. Note : Tagan power supplies have a high efficiency of ca. 75% and a PF-value up to 0.99 on high-loads. The special designed heat-sinks of the Tagan power supplies enable not only the best thermal management but also a lowest possible fan noise development. Indeed Tagan does not need fan on light-loads (i.e. zero dB operation); nevertheless for the sake of security at least one fan should run and on higher loads (due to higher heat-dissipations) then both 2 fans are working.

8. Why after switching-on the Tagan power supply only 1 fan running?
Answer : It is whether problem nor failure, but intended if • on light-loads at the beginning only 1 frontside fan (for lowering the noise) • on higher loads (Middle to Full-Load) both fans (front- & backside) working. Note : For a Flash-Animation click the file ” tagan-2.exe ”