Characteristic Analysis and Maintenance Method of Shanterups Power SupplyThe modular machine of Shante UPS power supply adopts drawer type, high intelligent multi-system modular design and on-line hot-swap technology to realize on-line replacement and on-line maintenance, which reduces the difficulty of maintenance and implements zero shutdown. Using N+X parallel redundancy wireless technology, each module rack can be completely separated, which is convenient for users to expand or reduce capacity in the future, and is very convenient to use. The concept of "multi-level inversion" is first used in the inverters, which reduces the loss of power devices greatly and the high-order harmonics of output voltage nearly double, thus reducing the volume and increasing the power density.
In UPS power supply industry, the product first uses 32-bit digital signal processor as the core processing chip, which is the most advanced and powerful 32-bit DSP processor in the international market. The running speed is up to 150 MPS, which not only has powerful numerical operation ability, but also has abundant event management ability. Especially suitable for complex, high precision, high speed, real-time requirements of the control system. Its application makes the product have the greatest improvement in electrical performance, reliability, function and other aspects.
Has a variety of working modes
The product has a variety of modes to choose from, easy to operate, and can achieve a variety of input and output modes: 1/1, 1/3, 3/1 or 3/3, input frequency can be 50 Hz or output frequency 60 Hz, output voltage can be set to 220 V, 230V, 240V. If the input and output transformers are reconfigured, the power supply needs of all countries and regions around the world can be met.
Small volume, high power density
The correct use and maintenance of Shante UPS power supply has a great impact on its service life. On the premise of correct use and maintenance, the service life of an UPS is usually 5-10 years or longer. If used and maintained improperly, it may not be available for several years. In particular, batteries need regular maintenance. Some units put UPS in storage for 2 to 3 years or longer, and find that the battery can not discharge on load when it is discharged. This not only brings inconvenience to use, but also increases unnecessary economic losses. And the price of batteries generally accounts for 1/3 of the price of the whole machine. If UPS with long delay, the price of battery pack can exceed the price of bare machine.
I. Use of UPS
1 meets input characteristic requirements
It is better not to use UPS input network side with other non-linear high-power loads (such as large motors, neon lights, elevators, etc.). If the quality of UPS input voltage is too poor, it may cause rectifier protection, and may also cause misoperation of control system, which may cause UPS fault load power off. For large and medium-sized UPS, if the power supply conditions are limited, isolation transformers can be installed on the input side of UPS to ensure that the input voltage is within the prescribed range when the quality of the power grid is poor.
2. Compliance with Output Characteristic Requirements
UPS is best run in the optimum load range. When the load with 60%-80% nominal capacity is too light, the efficiency of UPS decreases and the distortion rate of input voltage and current increases. When the load is too heavy, it is easy to make UPS turn by-pass frequently. UPS should be used at a reduced rate if some loads with high impulse current are needed. The nominal power capacity of UPS is closely related to the power factor of the load. Generally, the rated capacity of UPS is calibrated under the condition that the load is linear and the power factor is 0.8. The load type of UPS has certain design scope requirements, so the load type is best within this range. Backup UPS with small capacity can only be protected by input fuse when the power supply is by-pass under normal conditions. If the user does not pay attention to this point and overload the use, although UPS can continue to work when the municipal power supply, but when the municipal power abnormal battery is used for inverters, it will shut down because of overload protection UPS, which will cause damage to UPS and cause certain losses to users. Therefore, when using backup UPS, special attention should be paid not to overload. In addition to receiving special loads, it is better not to connect other electrical equipment privately at the output of UPS.
3. Correct operation
Because the load has a large impulse current at the moment of starting, the capacity of power components in UPS has a certain safe working area. If the starting impulse current is large, UPS will be over-current protection, and turn from the output of the inverter to bypass output, which will cause serious damage to power components. UPS is powered by municipal electricity when it works in bypass. Its capacity can be regarded as infinite and its shock resistance is strong. Therefore, the following operating steps can be used when UPS starts up:
(1) First turn on the static bypass input switch of UPS, so that UPS "is in the power supply state of the city power bypass.
(2) Open the load one by one. First, open the load with smaller impulse current, and then open the load with larger impulse current.
(3) Open the rectifier input, close the battery switch, and then start the inverter, so that the load automatically from the static bypass power supply to the inverter power supply state.
Because there are a large number of inductance energy storage elements in UPS, when the load is suddenly turned off, the instantaneous high voltage will be generated at both ends of the inductance element according to the current change rate; especially when the load is suddenly turned off at full load, the instantaneous voltage will be higher. If UPS internal components are often impacted by high voltage, the performance will be degraded and there is a risk of breakdown. To minimize the impact of high voltage on components, the following shutdown procedures can be used:
(1) Close the load one by one.
(2) Turn off the inverter and make UPS turn from the inverter state to the bypass state.
(3) Turn off the rectifier input switch, then turn off the static bypass input switch, then turn off the UPS output switch, and finally disconnect the input power circuit.