The UPS should be kept away from the heat source
The environment temperature can exert a huge influence on the UPS. Research shows that the accumulator of the UPS should work under the environment temperature ranging from 10° to 25°. When the environment temperature rises, the battery’s intrinsic storage service life will be shortened gradually.

The inverter is located between the rectifier and the static switch in the UPS. As a core part of the UPS, it mainly converts the DC output by the rectifier or the accumulator into the 50Hz AC, and then sends it to the static switch and provides it for the load equipment.
Below are major requirements of the general UPS about the inverter:
The output AC voltage should be stable. Either the input voltage fluctuations or voltage fluctuations triggered by other situations require the output voltage of the inversion to be within the steady precision scope. Under the condition of static voltage, the voltage fluctuation is generally around ±2%。

To ensure normal power supply under any condition is an important basis for the metallurgy industry. Therefore, apart from ensuring normal power supply for the industrial grid, the UPS should be equipped. The UPS is an important equipment to ensure stability and continuity of power supply. Due to a high degree of intelligentization, the energy storage materials can adopt non-maintenance accumulator. As a result, maintenance and repair of the system is usually ignored. Nevertheless, maintenance quality has a huge influence on the electric power’s service life and fault rate. In the following part, we will introduce do’s and don’ts as well as daily maintenance requirements of UPS.
Though the UPS power supply system’s equipment model and system capacity that every enterprise is equipped with are different, their working principle and major function are the same. In terms of UPS power source type selection, every station chooses the online type. This is because the online UPS power system can switch various kinds of power supply at zero time, the length of power supply is optional, and the UPS is characterized by steady voltage, frequency and purification.

When there is electric power, the UPS output is normal; when there is no electric power, the buzzer will give a long blow and there is no output.
Fault analysis: Judged by the phenomenon, the accumulator and the inverter are in fault.
Check the accumulator’s voltage to see whether the accumulator is inadequate charged, charge whether the accumulator itself is in fault or the charging circuit is in fault;
If the accumulator working voltage is normal, check whether the inverter’s drive circuit functions normally. If the drive circuit outputs normally, it means that the inverter is damaged;

How to correctly use and maintain the UPS
Startup & Shutdown: In order to prevent the impact current generated by the load at the instant of startup on UPS, there should be power supply for the UPS first so that it will be at the bypass work status. Then, gradually open the load. This can avoid the impact of the load current on UPS and extend the service life of UPS.
Before startup: First confirm whether the polarity of the input electric supply wiring is correct to ensure personal safety. Notice that the total load should be no larger than the rated power of UPS.

The uninterruptible power supply (UPS) should pay attention to the following aspects.
Initial charge
The newly-purchased UPS should be inserted into the 220V electric supply grid to get charged for more than 12 hours so that the batteries can be fully charged. If the UPS is left unused for a long time, it should be started for 24 hours every two to three months according to the storage environment. This can ensure the UPS to get fully charged, and that the UPS can work for two to three minutes under the work status of the inverter. Moreover, the normal life service of batteries can be guaranteed.

An isolation transformer is a transformer in which the input winding is electrically isolated from the output winding. The principle of the isolation transformer is the same as that of the ordinary transformer. It uses the principle of electromagnetic induction. Since the secondary is not connected to the ground, there is no potential difference between any of the secondary lines and the ground. It has been widely used in UPS power systems.

Case 1: The newly installed UPS power supply does not start properly.
This situation may be caused by two reasons. The user can first check if the battery connection plug on the rear panel of the UPS power supply is connected. If not, you can open the front panel to check if the battery is connected.

The following problems occur frequently in the power grid and cause interference or damage to computers and precision instruments:
Power surges: The output voltage rms value is 110% higher than the rated value and lasts for one or several cycles. The surge is mainly due to the high voltage generated by the sudden unloading of the grid when the large electrical equipment connected to the grid is shut down.

The condition of UPS to achieve "N+1" redundant parallel operation
UPS's "N+1" redundant parallel operation technology is the key technology to improve the reliability and availability of UPS. The parallel connection of each UPS module must meet the following three conditions:
(1) The frequency, phase, phase sequence, voltage amplitude and waveform of the inverter modules of each UPS must be the same;

Battery battery temperature reliability

Temperature has a large effect on the battery during natural aging. Detailed experimental data shows that every 5 degrees Celsius, battery life increases and the temperature will drop by 10%, so the UPS should be designed to maintain the battery temperature. All on-line, defensive lines run more than mixed or online interactive UPS heat storage / UPS, which is an important reason for the relatively long one of the back-end or online interactive UPS battery replacement cycle.

The load capacity of the UPS is the first consideration for the user when selecting the UPS. That is, how much UPS is needed, and the ability of the selected UPS to carry the load under various conditions needs to be taken seriously. But UPS is not like a transformer, as long as the load power does not exceed its rated output capacity (kVA) value, no matter what the load is, and the output capacity of the UPS is not only related to the load size, but also related to the nature of the load.