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4、使用變頻器控制高速電動(dòng)機(jī)時(shí)，由于高速電動(dòng)機(jī)的電抗小，會(huì)產(chǎn)生較多的高次諧波。而這些高次諧波會(huì)使變頻器的輸出電流值增加。因此，選擇用于高速電動(dòng)機(jī)的變頻器時(shí)，應(yīng)比普通電動(dòng)機(jī)的變頻器稍大一些。
5、變頻器用于變極電動(dòng)機(jī)時(shí)，應(yīng)充分注意選擇變頻器的容量，使其大額定電流在變頻器的額定輸出電流以下。另外，在運(yùn)行中進(jìn)行極數(shù)轉(zhuǎn)換時(shí)，應(yīng)先停止電動(dòng)機(jī)工作，否則，會(huì)造成電動(dòng)機(jī)空轉(zhuǎn),惡劣時(shí)會(huì)造成變頻器損壞。
6、驅(qū)動(dòng)防爆電動(dòng)機(jī)時(shí)，變頻器沒有防爆構(gòu)造，應(yīng)將變頻器設(shè)置在危險(xiǎn)場(chǎng)所之外。
TEP7 常用功能塊說明
1. SFB0 "CTU" SFB1 "CTD" SFB2 "CTUD" SFB4 "TON" SFB5 TOF
兼容IEC61131-3的計(jì)數(shù)和計(jì)時(shí)功能塊
2. SFB41 "CONT_C" SFB42 "CONT_S" SFB43 "PULSEGEN"
用于PID控制
41---連續(xù)
42---離散
43---用于將一個(gè)模擬量轉(zhuǎn)化為與之對(duì)應(yīng)的周期性開關(guān)量脈沖信號(hào),該脈沖的
占空比與模擬量的數(shù)值大小成正比.
3. SFC0 "SET_CLK" SFC1 "READ_CLK"
用于讀寫PLC中的系統(tǒng)時(shí)間
4. SFC14 "DPRD_DAT" SFC15 "DPWR_DAT"
用于讀寫DP從站中的一致性數(shù)據(jù) 如:讀寫用DP通訊的變頻器中的控制字
5. SFC20 "BLKMOV" SFC21 "FILL"
塊拷貝,塊填充
6. SFC46 "STP" SFC47 "WAIT"
SFC46 使PLC進(jìn)入STOP狀態(tài),挺有用的:可以當(dāng)軟件陷阱,或利用上位控制PLC停機(jī)
7. SFC60 "GD_SND" SFC61 "GD_RCV"
MPI的GD通訊
8.IEC Function Blocks
FC22 "LIMIT" FC25 "MAX" FC27 "MIN"
FC22 ---限幅輸出
FC25,FC27 --- 3個(gè)數(shù)比大小
9.PID Control Blocks
FB41/42/43 同 SFB41 "CONT_C" SFB42 "CONT_S" SFB43 "PULSEGEN"
FB58 "TCON_CP" FB59 "TCONT_S" 用于溫度控制PID
10.Ti-S7 Converting Blocks
FC105 "SCALE" FC106 "UNSCALE"
模擬量輸入輸出的比例和數(shù)據(jù)類型轉(zhuǎn)換
11、SFC1 讀取系統(tǒng)時(shí)鐘
12、SFC3 啟動(dòng)/停止運(yùn)行時(shí)間定時(shí)器
13、OB1：主程序循環(huán)
14、OB10--OB17：在設(shè)置的日期和時(shí)間啟動(dòng)
15、OB20--OB23：延時(shí)后啟動(dòng)
16、OB30--OB38：以設(shè)定的時(shí)間為周期
17、OB40--OB47：檢測(cè)到來自外部模塊的中斷請(qǐng)求時(shí)啟動(dòng)
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