The technical experts of Chaote Technology, according to the continuous practice and application, are familiar with the relevant methods of using UPS power. This question mainly describes the configuration skills of UPS power discharge time.
UPS power application skills (1) At present, there are many varieties of Ups Power Supply on the market. The manufacturers of the UPS are from different countries. The UPS power supply produced by different countries may be different in the working principle, and the design of the specific line of the UPS power supply. Some manufacturers often Erasing the trademarks on some structural circuits often brings a lot of inconvenience to users of many UPS power supplies. Our Technology's UPS power technology experts pointed out that despite this, we can still find the commonality of UPS power supplies from different manufacturers. We can also summarize some of the same usage techniques when using and repairing UPS power supply as follows: 1. In the backup UPS design, in order to reduce the production cost, it uses the same main power transformer when the mains supply and the Ups Battery are powered. When this type of UPS is powered by a battery, its AC output live and neutral positions are fixed and the user cannot change their mutual/sequence. Since the neutral line of the mains input of the UPS is the ground of the UPS control line, the user must follow the relevant regulations on the manufacturer's product specification when using the UPS. Second, the actual available capacity of all Ups Batteries is closely related to the discharge current of the UPS battery, the environmental operating temperature of the UPS battery, the length of the storage time, and the load properties (resistance, inductance, and capacitance). If the UPS battery cannot be used correctly, the actual available capacity of the UPS battery is only a small part of the nominal capacity of the UPS battery. For this reason, users should pay attention to the following points when using the UPS battery: 1. The excessive discharge of the UPS battery and the long-time open circuit of the battery are not used, which will cause a large amount of lead sulfate to be generated inside the UPS battery and be adsorbed to the cathode of the UPS battery to form a so-called cathode "sulfation". The internal resistance of the battery is increased, and the charge and discharge performance of the UPS battery is deteriorated. The current life of the commonly used M-type sealed lead-acid UPS battery is about 3-5 years. 2. For most current UPS, after each discharge of the UPS battery, the UPS battery can be floated by the battery charging circuit inside the UPS. In order to ensure that the UPS battery is placed in a saturated state of charge, the charging time is generally 10 to 12 hours. Insufficient charging time will cause the UPS battery to be undercharged. At this time, the actual available capacity of the UPS battery is much lower than the nominal capacity of the UPS battery. For some UPS power supplies, when the mains voltage is lower than 200V, it is impossible to saturate the UPS battery with the charging circuit inside the UPS power supply. 3. Some users use the method of reducing the actual load power of the UPS or increasing the battery capacity to extend the discharge time of the battery. 4. When the UPS battery encounters one of the following conditions during use, in order to revive the chargeable and discharge characteristics of the UPS battery, a balanced charging method should be used to solve the problem. The so-called equalization charging is an operation method in which each UPS battery unit is connected in parallel and charged with a uniform charging voltage. The situations in which the UPS battery needs to be balancedly charged are: • Excessive discharge causes the terminal voltage of the UPS battery to be lower than the discharge end voltage allowed by the UPS battery. For the 12V M-type lead-acid battery, the discharge final voltage is about 10.5V; in the UPS battery pack, the terminal voltage difference between each battery unit exceeds about 1V; · Long-term stationary battery (including newly purchased UPS battery); · UPS battery with electrolyte replaced. For the NP6-12 sealed lead-acid battery, its balanced charging voltage is equal to about 14V, the maximum allowable equalizing charging current is less than 1.5A; for the LCLl2V24P sealed lead-acid battery, the equalizing charging voltage is equal to about 14V, the maximum allowable The equalization charging current is less than 8A. In the currently commercially available UPS with a power of less than 2 kW, the float current of the UPS battery pack is mostly controlled within 1A. 5, in order to ensure that the UPS battery has good charge and discharge characteristics, for long-term idle UPS (experience data is UPS shutdown for more than 10 days), before restarting the use, it is best not to load, let the UPS use the internal charging The circuit is used after floating the UPS battery for 10 to 12 hours. For the backup UPS users, if the UPS is working in the backup mode for a long time, it is recommended that the UPS be in the inverter for at least 2-3 minutes every other month to activate the battery. Third, for most UPS power supplies, when they are in the inverter power supply state, its load characteristics are generally required to be purely resistive or capacitive. When the load is capacitive, its power factor requirement is greater than about 0.8. Therefore, for those with inductive loads, care should be taken to adjust their total load reactance to meet the conditions of power factor greater than 0.9 as much as possible. Otherwise, the actual load power of the UPS power supply will decrease. Manufacturers suggest that the maximum starting load of the UPS power supply should be controlled within 80% of the rated output power of the UPS. For a sinusoidal output UPS, when the load is less than 30% of the rated output power of the UPS, its output voltage waveform distortion factor will increase slightly. Practice has proved that for most UPS power supplies, it is the best way to control the load within 30% to 60% of the rated output power of the UPS. Therefore, users who have requirements for AC input waveforms should pay attention to this. According to the above discussion, we have already learned what kind of usage and maintenance methods should be used for different brands of UPS power supply, and hope to bring more help to more customers. Supertech personnel will continue to work hard. Application skills of UPS power supply (2) According to the constant application and practice, after continuous lessons and summarization, the ultra-special personnel have in-depth research and understanding of different types and different brands of UPS power supply. The following years will share the experience accumulated with you, the application of UPS power supply. The tips are as follows: 1. For the backup UPS power supply, when it is in the backup working state of the mains supply, although it has the anti-interference automatic voltage regulation function, it does not have the output short-circuit automatic protection function (usually realized by the AC input fuse). Limiting). Therefore, for this type of UPS power supply user, the capacity of the fuse in the AC input circuit must not be increased arbitrarily. Only when this power supply is in the inverter power supply state, it has automatic voltage regulation and output short circuit automatic protection. 2. For the UPS power supply with backup square wave output, because there is no technical means to accurately adjust its square wave operating frequency in its control circuit, when this power supply is in the inverter power supply state, sometimes its The square wave operating frequency is likely to deviate significantly from 50 Hz. In addition, for a square wave output UPS power supply, when it is in the inverter power supply, it is not suitable for long-term no-load operation. Third, for the backup UPS power supply, generally set the following potentiometer for the user to adjust the working point: Adjust the UPS power supply mains supply - the inverter power supply work conversion voltage; · Adjust the UPS power inverter output AC voltage Size; · Adjust the size of the charging voltage of the battery charging circuit. For the online UPS power supply, generally only a potentiometer for adjusting the AC output voltage of the UPS power supply is provided for the user. Which potentiometer should be adjusted, please refer to the relevant product manual. Under normal circumstances, users should not easily adjust other potentiometers in the machine. If it is not good, the UPS power control circuit will be out of adjustment and the machine will not work properly. Fourth, most of the UPS power supplies currently on the market have anti-interference automatic voltage regulation. Therefore, under normal circumstances, it is not necessary to add an anti-interference type AC voltage regulator. If the user must use an AC voltage regulator, the AC voltage regulator can be used as an input stage for the UPS power supply. 5. When purchasing long-delay UPS power supply, in order to ensure efficient use of UPS battery, improve its available capacity and extend the service life of UPS battery, you should use a charger with improved constant current charging characteristics. . If a general cut-off type constant voltage charger is used, the performance of the UPS battery will deteriorate rapidly. For long-latency UPS power supplies, the cost of UPS battery packs often exceeds the cost of UPS power supplies, so users should be aware of this. 6. If the user uses a small diesel generator to supply power during the power outage of the mains, because the internal resistance of the diesel generator is much larger than the internal resistance of the mains grid, it may cause the backup UPS to be powered by the mains. When the diesel engine is powered, the output voltage value of the AC stabilized voltage line of the UPS power supply has a large difference. In this case, the user should readjust the AC voltage regulation operating point of the UPS power supply. 7. For the backup UPS power supply with square wave output, the conversion time of the mains power supply (2) inverter power supply is about 4~9ms. This kind of situation cannot guarantee 100% reliable power supply to the load. For such UPS power supply, if a fault occurs by chance, the computer's working program is interrupted or destroyed, that is, the computer generates a "self-test" operation and does not mean that the fault occurs. Therefore, the square wave output UPS power supply should not be used in the power supply system of the computer network. 8. If the square wave output UPS power supply is used as the host in the long-delay UPS power supply, it will bring about an increase in the computer hardware failure rate. In principle, the sine wave output UPS should be used as the host in the long delay UPS power system. 9. For backup UPS (such as Datapasse UPS) with two-way thyristor as static switch, the mains supply (2) inverter conversion time is very short, only on the order of microseconds. I hope that the above sharing can bring some help to UPS power users. In addition, Super Technology Company also provides customers with different brands of UPS power supply. UPS power quality is excellent, performance is good, and many users trust, welcome new and old customers. Visit our company.
February 02, 2024
