UPS (uninterrupted power supply system that is), according to its power supply, can be divided into two kinds of line-and back-up. Online UPS with back-up control lines than the complicated and expensive, commonly used in more important areas. -> This is mainly about small back-up UPS power.
The PC is generally used small 500W ~ 1000W UPS. When the electricity is interrupted by the UPS power supply 5 to 10 minutes and sound an alarm to alert users to quickly handle the work in the archive after the normal exit, so that the information from destruction. Its working principle is this: When the electricity is normal, the UPS internal rectifier, regulator, filter, 110V output voltage directly, and float inside the battery charge, battery and inverter and other devices are in standby state; when electricity is interrupted, battery charge state to discharge by the state, state of the various components in the inverter, the inverter and 110V output voltage booster treatment for use.Second, pay attention and regular maintenance points
in normal use, UPS mains power supply, the inverter does not work, although other logic control components in the power-on state, but they are low voltage, low power consumption. Interruption in the electricity, the inverter power switch relatively short working hours, so the probability of failure is relatively low. UPS failure, mostly due to the user caused by improper use.
In the course of using the UPS should note the following
issues: 1. When used, the battery must be fully charged and the battery cable should be good contact. Battery voltage is too low or not connected, do not open the UPS, otherwise there may be dangerous.
2. Each time before starting, be sure to turn off all the load carried by UPS. Must be in the city to open under normal conditions UPS, UPS is confessed to be the voltage, let the load of electricity.
3. No electricity in the case do not open the UPS. When a power failure, the deal to work as soon as possible to turn off the machine, then close the UPS. UPS is closed, we have to wait 10 seconds and then turn UPS, to prevent damage to the UPS.
4. If the UPS case of long-term work in the city, it is recommended every three months or so unplug the AC power, the inverter working, so battery discharge until the alarm signal becomes short, then connect the external power supply. This will not only check the battery and the inverter is working properly, but also extend battery life.
5. UPS is the actual load to 70% of its power prevail, such as the real power of 700W, 1000W power to choose the UPS. Note that the load can not be controlled silicon rectifier circuit and a larger inductance circuit, otherwise it will be dangerous.
6. Enough to charge the battery case, the inverter load is about 70%, if the UPS is working 2 to 3 months after the alarm signal to become short and rapid, then the battery life to the limit, the battery must be replaced. Otherwise, not only affect the work, may also cause other adverse consequences. After the new battery to charge before normal use.
7. Work in the UPS must be guarded. Encountered when the power fails to promptly turn off the alarm UPS UPS, otherwise the battery will discharge over the shortened life expectancy due to or burn inverter tube. Noting the above points, UPS generally not a problem, and the battery life of up to 3 to 5 years.
UPS common faults and maintenance as
follows: 1. Inverter transistors burned
burned to be identified because the crystal, the new can be put to work. New operating parameters must meet the requirements, the pressure value must be more than twice the battery voltage, β value of not less than 150, otherwise the pipe pressure drop increase, crystal heat fast, easy to be burned again.
2. Battery no power
no electricity or battery voltage is too low, causing inverter transistor is burned reasons. Replace the battery, note the replacement of new battery type must be consistent with the original, the voltage is not high, but the number can be increased appropriately Ah. New battery must be charged six hours straight.
3. Mains normal, but the UPS inverter working in the state
to check the mains input transformer winding and insurance, without question, to check the secondary circuit and load.
4. Logic control circuit is faulty
logic control circuit problem, according to logic, the reference voltage and waveform on foot step by step inspection. Examination, must take the input of inverter transistor unplug. This can prevent accidents, but also extend battery life.
