The selection, load power, and delay time of the UPS power supply are introduced and the maintenance of the battery is introduced.
The rapid development of modern medical technology, medical equipment is constantly updating, some high, fine, and pointed equipment are increasingly applied to clinical. These advanced equipment requirements for power supply systems are also increasingly high, and various sensitive electronic components in the equipment require a sustained power supply. (Especially some import equipment, they are designed in accordance with the international standard grid environment indicators, these equipment can work normally within the standard grid range, and have less fault, long life. But in my country’s grid conditions, it will appear Unstable work, high failure rate, shortening life.
The reason is mainly the current public power system in my country. There are many unstable factors. For example, the grid voltage is sometimes high, low, surge, impact and sudden interruption, etc., which seriously affects the safe operation of medical equipment, and even damage equipment and causing serious economic losses. Therefore, UPS (Uninterruptible
Power
The use of System Uninterruptible Power Supply has become the key to protecting important equipment. At present, most hospitals have some important devices equipped with the corresponding UPS power supply. For example, our hospital is equipped with UPS power supplies for MR, CT, Color ultrasound, biochemical analyzer, and blood cell counter, and these UPS powerways have become the protection of our important medical equipment. Therefore, how to use and maintain the UPS power supply, it has considerable practical significance.
1 Selection of UPS power type
The UPS power is divided into rear-standlash, online interactive, and online. When the rear-columerization UPS power supply is normally supplied, it supplies the voltage supplied to the load to the mainstay of the mainstay of the mainstay. When the market is not normal, it provides a stable square wave to the load. power supply. When the online interactive UPS power supply is normal, it provides a sine wave voltage that is supplied to the load to the load, and only when the market is not normal, only the user load provides inverter. Sine wave power supply. Both the rear preparation and the online interactive UPS power supply can provide a standard sine wave voltage to the load in real time.
The online UPS power supply is different. As long as there is a load work, the inverter has been working, it provides the load to the load, the reliable and stable sine wave power supply after inverting, and the voltage stability is better than the backup and online interactive UPS power supply, and The instantaneous response characteristics of the output voltage have good "purification" and safety protection functions, and the anti-interference ability is very strong. Therefore, there is a large-scale medical device with a relatively large market, and a high voltage stable UPS power supply should be selected. The medical unit equipment basically matches online UPS, in principle, the rear-collaborative UPS power supply can only be used in devices that are not high on output waveforms, such as office equipment, etc., and cannot drive sensitive loads. As our college color ultrasound, it is a 5
KVA rear-standing UPS, the results found that there was always a strip-shadow interference on the screen. After changing a online UPS power supply, the fake shadow phenomenon disappeared.
2 Determination of UPS power load
The nominal capacity of the UPS power supply means that the load is dependent on the power. The load that is actually the UPS power supply is usually non-linear load, which varies with the change of the load power factor. If the output characteristics of the UPS are not good, the output voltage will drop, voltage The stability is reduced, affecting the safety work. Therefore, the ability to determine the capacity of the UPS should be considered for the UPS to determine the actual load capacity according to the rated power and power factor provided by the UPS power supply, and the UPS is avoided because the load is too heavy or damaged. UPS inverter. That is, the rated output power is 1
KVA’s UPS power is not necessarily driven 1
KVA load.
In order to extend the service life of the UPS, the UPS power is not allowed to run in full load. The rear-standing UPS power is generally selected from 60% to 70% of load, and the online UPS power is generally selected from 70% to 80% load amount, and the UPS should not be run until long-term operation. Battery power supply is mainly affected by factors such as load size, battery capacity, ambient temperature, battery discharge cut voltage, generally calculating the formula of the UPS battery power supply time is T = V * ah * n * p.f / w. Where T is the battery pack supply time, V is the battery voltage, the AH battery is a fixed capacity, and P.f is the output power factor of the UPS power supply, and W is the load power. For example, the battery voltage of the UPS equipped with CT is 12
V, the fixed-grid capacity is 100 Ah, the amount of power storage is 64, the power is 0.7, the load power is 40
KW, then its power supply time is T = 12 * 100 * 64 * 0.7 / 40000 = 1.344 h is approximately 80 min, that is, the power supply time can be maintained for approximately 80 min after power outage.
3 UPS power hosts The correct use of the host should read the random instruction manual carefully before using the UPS power supply. The UPS power is suitable for long-term uninterrupted work, and it is not appropriate to turn off every day or often. If the load is turned off, it can be connected to the load between the UPS power output and the load, and turn off the air switch to disconnect the power supply. The UPS power supply should be cleaned in a regular (half year) to prevent dust from entering the chassis to affect the heat dissipation of the electronic device, and damage the electronic device. The cooling fan and large-capacity capacitors of the UPS should be checked regularly. 4 UPS Battery Maintenance Since the UPS power is used is a maintenance-free battery, each 12 V is basically used in series, usually a few tens of series is not equal. As long as one of the batteries increases high or damage, the entire set of batteries cannot be powered by the design capacity, which may cause a power outage. Therefore, it is necessary to regularly check and maintain the battery. 4.1 Newly purchased UPS power supply or newly replaced battery must first give the battery enough to use because the UPS power supply is installed from the production to the user, it takes a period of time, the battery is reduced due to self-discharge, and can not be reached The nominal delay time must be charged at the product usage manual in the product usage manual to ensure normal power supply. 4.2 Ambient temperature battery should pay attention to the ambient temperature, and the battery should generally be at 0 ° C ~ 30.
Use of ambient temperature between ° C. The temperature over high battery will be greatly shortened, and the temperature of the sealed-free maintenance battery is increased when the ambient temperature exceeds 25 ° C, the temperature is 10 per liter.
At ° C, the battery life will be shortened. The temperature is too low, and the capacity of the actual release of the battery will also be greatly reduced. 4.3 The battery pack is in a long time in the charging state, and its internal resistance increases or permanently damaged
Therefore, avoiding the battery for a long time in the "floating" state, the UPS power supply running in areas where very long-term power outages must be discharged once every 3 months, ie turned off the AC input power of the UPS power supply. Let the UPS power supply in battery mode, battery discharge current ≥ 0.1
A. 4.4 Avoiding battery depth discharge or long-term current over-electricity discharge
When the battery is discharged, since the battery is slowly discharged from the end voltage of the pool, the battery is actually discharged when the UPS power supply is turned off, resulting in a shortened battery failure or life. If the battery depth is discharged, it will also affect its life. When the battery pack is discharged, 8
H ~ 12 h is charged to charge the battery.
4.5 Regular inspection Regular (three months) Check the end voltage and capacity of each battery in the battery pack, each battery inter-terminal voltage does not exceed 1 V, if more than 1 V is maintained, that is, use a balanced pressure limit 0.5 A charge or replace the battery. The battery pack needs to be replaced by 4 A to 5 A to ensure normal use of the UPS power supply.
Hongbao is an export-oriented enterprise specializing in scientific research, development, production, sales and technical services in power field products. The company has more than 1,800 employees, including more than 200 scientific and technological personnel, with an asset of 1 billion yuan, 128,000 square meters of production plants, and continuously won the star enterprises for many years. Honorary title and other credit enterprises.
The company’s main sales, maintenance, maintenance products are: EPS emergency power supply, UPS uninterruptible power supply, inverter, battery, DC screen, fire patrol cabinet, fire power monitoring system, SVC, SBW AC regulator power supply, DC power supply, JJW purification AC power supply, CWY anti-interference AC parameter power supply, SJW microcomputer without contact compensation power regulator, SBW high-power fully automatic compensation power regulator, HBR1 motor soft starter, inverter, charger, voltage regulator More than 30 series of transformers, circuit breakers, micro motors, electric welding machines, energy-saving lamps, 800 varieties, all products are underwritten by Chinese people’s insurance companies.
Changchun Hongbao is an export-oriented enterprise specializing in research, development, production, sales and technical services in power field products.
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