13 why is the motor load, lighting or capacitive load will result in power can not be successfully boot?
Answer: when the load is the motor, bulb or capacitive load, when the moment of starting current is caused by too much, as recommended by the power of its overload protection is rated current methods of product design.
14 why the power will be down in use, shut down after the re opening and can then operate?
Answer: general cause use breakdown causes power supply about two of cases, the first may be load overloading caused by overload protection, suggestion to improve the output power supply or modified load design; the second is the temperature is too high, the phenomenon of occurrence over temperature protection. These happen will make the power shut down due to enter the state of protection, and out after the boot can be restored to normal.
The 15 system uses the output end (GND) and the earth (FG) for concurrent, power supply products if possible?
Answer: the product is isolated design can be, system of your company (Ground) and the earth (Frame Ground) basically paired together in safety is no problem, but to have to pay attention to the effect of EMI.
16 the use of shell was found were voltage, is this normal situation? Whether can cause the harm of human body?
Answer: with the EMI requirements, so that the general POWER SUPPLY input will through some filter noise capacitor and FG (shell) connection, resulting in case of charged phenomenon. But this kind of phenomenon, IEC60950-1 also has a clear specification, for example: information equipment leakage current, must be less than 3.5mA, but as long as the correct grounding can be solved.
17 because the demand application, might reduce the power supply fan noise?
Answer: power supply built-in fan radiating part of its operation has a direct relationship and noise, if reduce fan noise (exhaust volume) also reduced the heat dissipation capability. The reliability problem of this aspect will affect the products, other products in the certification for the fan selection is also limited by the minimum exhaust volume set, when the fan to change certain products, Ian gauge definition to send safety agencies reported admit, pass a test before using a small amount of fan. Another suggestion system selects PSU, generally in the 150W products can not need the following 150~500W products fan; fan and no fan products can choose; 500W and above is the need for fan. 18 power supply generally transverse and vertical placement, what should pay attention to the place for the use of the product?
Answer: the power supply design without fan inside the majority of small power is mainly horizontal placement, if the system mechanism problem needing to vertical power supply, because the heat issue should consider the output power derating at higher ambient temperature (the reference product specifications book). As for the internal power supply containing cooling fan models, the resettlement mode for horizontal or vertical than indifference, or forced cooling fan system and another application independent radiating power supply provides appropriate is arranged, it was no difference. Derating curve of Ex:SP-150 products, the general transverse / vertical application environment temperature difference of 5 degrees C, and forced cooling / natural heat differential 20% output power.
19 why some models after turning on the fan does not turn?
Answer: cooling fan of some products are rotated by a temperature control fan (EX:S-240), in order to extend the life of the fan when the temperature is not reached, the internal temperature setting, nature does not turn. |
