UPS-500's mould is not disconnected the adjustment of power supply work Dian
UPS-500 is not disconnected the power supply and adjusts his work point for user provides three fine tuning potentiometres, and introduces as follows at present:
(1) potentiometre VR1: is used to adjust the voltage being charged of storage battery. The battery is charged, and the circuit is a permanent voltage source. This signifies, and it will stop to be charged voluntarily when battery voltage is filled to the rated value. The circuit is when designing. Serve as this definition of voltage to 27 volts. This is charged, and the measurement method of voltage is: dismantling the tie of battery after inserting UPS's power supply the 220 volts local junction circuit electrical network, the resistance of 10W is as the false load to simple 200 Ω on the rejoin, and ascertains by measuring or surveying this voltage from the connection cable of battery more here. Also that is to say: 27 volts indicate voltage when being charged the circuit no-load, and is not voltage when taking the storage battery load. This point will especially be paid attention to when adjusting VR1. Otherwise the parts are burnt up greatly because of the charging current is crossed easily in the committee, or damage the storage battery because of crossing pressing to be charged.
(2) potentiometre VR2: when UPS's power supply is in contrary(ly) to become the ware when supplying power, and can cross the effective dimension that the potentiometre was adjusted UPS power supply export side wave voltage by way of adjusting VR2. The adjustment method is: pulling out the 220 volts local junction circuit power supplies not is disconnected with the voltmeter at UPS measuring voltage on the export of the power supply socket. Adjusting VR2, gradually makes to send out voltage to achieve the fixed value.
UPS-500不間斷電源為用戶提供三個(gè)微調(diào)電位器來調(diào)整其工作點(diǎn)，現(xiàn)介紹如下：
（1） 電位器VR1:用于調(diào)整蓄電池的充電電壓。電池充電電路是一個(gè)恒電壓源。這意味著，當(dāng)電池電壓被充到額定值時(shí)，它將自動(dòng)停止充電。線路設(shè)計(jì)時(shí)。把這一電壓定義為27伏。這一充電電壓的測量方法是：把UPS電源插入220伏市電電網(wǎng)后，拆掉電池的連接線，再連接上一個(gè)約200Ω，10W的電阻作為假負(fù)載，這里再從電池的連接電纜上測定這一個(gè)電壓。也就是說：27伏指充電電路空載時(shí)的電壓，并不是指帶上蓄電池負(fù)載時(shí)的電壓。這點(diǎn)在調(diào)整VR1時(shí)，要特別注意。否則委容易因充電電流過大而燒毀器件，或因過壓充電而損壞蓄電池。
（2） 電位器VR2:當(dāng)UPS電源處于逆變器供電時(shí)，可通過調(diào)整VR2過電位器來調(diào)整UPS電源輸出方波電壓的有效大小。調(diào)整辦法是：拔掉220伏市電電源用電壓表在UPS不間斷電源的輸出插座上測量電壓。逐漸調(diào)節(jié)VR2，使輸出電壓達(dá)到預(yù)定值。
（3） 電位器VR4:用于調(diào)整UPS不間斷電源從市電供電轉(zhuǎn)變?yōu)橛赡孀兤鞴╇姷霓D(zhuǎn)變電壓。這里所指的轉(zhuǎn)換電壓的含義是：當(dāng)輸入的市電電壓逐漸下降時(shí)，在市電電網(wǎng)電壓低于的設(shè)定的轉(zhuǎn)變電壓值時(shí)，對(duì)于UPS不間斷電源來說，它就認(rèn)為是市電供電發(fā)生了故障。一臺(tái)可調(diào)變壓器（當(dāng)市電電網(wǎng)電壓不低于170－180伏時(shí)）把UPS電源的交流輸入電壓從高到低逐漸調(diào)整至170伏左右，然后逐漸調(diào)整電位器VR4，使UPS電源從市電供電轉(zhuǎn)變?yōu)橛赡孀兤鞴╇?。在調(diào)整轉(zhuǎn)換電壓時(shí)，請記住轉(zhuǎn)換電壓的滯后特性。即當(dāng)UPS電源的市電輸入電壓從高往低調(diào)整時(shí)的轉(zhuǎn)換電壓V1（例如170伏）比市電輸入電壓由低向高逐漸增高時(shí)的轉(zhuǎn)換電壓V‘1（例如180杖）要小。即從逆變器供電轉(zhuǎn)換到由市電供電時(shí)轉(zhuǎn)換電壓一般要高10伏左右。這是為了防止在轉(zhuǎn)變點(diǎn)附近UPS不間斷電源在市電供與逆變器供電之間由于市電電網(wǎng)各種干擾而引起不正常的頻繁切換。這一電壓滯后寬度受電阻R64所控制，減少電阻R64的阻值會(huì)加寬其滯后寬度。