3HAC025887-001
3HAC025887-001
3HAC025887-001
3HAC025887-001
變頻器提供三種不同的工作方式供用戶選擇：
方式0：基本工作方式。變頻器始終固定驅(qū)動一臺泵并實(shí)時(shí)根據(jù)其輸出頻率：控制其他輔助泵啟停。即當(dāng)變頻器的輸出頻率達(dá)到最大頻率時(shí)啟動一臺輔助泵工頻運(yùn)行、當(dāng)變頻器的輸出頻率達(dá)到最小頻率時(shí)則停止最后啟動的輔助泵。由此控制增減工頻運(yùn)行泵的臺數(shù)。
方式1：交替方式，變頻器通常固定驅(qū)動某臺泵，并實(shí)時(shí)根據(jù)其輸出頻率，使輔助泵工頻運(yùn)行，此方式與方式0不同之處在于若前一次泵啟動的順序是泵1→泵2，當(dāng)變頻器輸出停止時(shí)，下一次啟動順序變?yōu)楸?→泵1。
方式2：直接方式。當(dāng)啟信號輸入時(shí)變頻器啟動第一臺泵當(dāng)該泵達(dá)到最高頻率時(shí)，變頻器將該泵切換到工頻運(yùn)行，變頻器啟動下一臺泵變頻運(yùn)行，相反當(dāng)泵停止條件成立時(shí)，先停止最先啟動的泵。
3.2 PID的調(diào)節(jié)功能
由壓力傳感器反饋的水壓信號(4-20MA或-5V)直接送入PLC的A/D口(可以通過手持編程器)，設(shè)定給定壓力值，PID參數(shù)值，并通過PLC計(jì)算何以需切換泵的操作完成系統(tǒng)控制，系統(tǒng)參數(shù)在實(shí)際運(yùn)行中調(diào)整，使系統(tǒng)控制響應(yīng)趨于完整。
3.3“休眠”功能
系統(tǒng)運(yùn)行時(shí)經(jīng)常會遇到用戶用水量較小或不用水(如夜晚)情況，為了節(jié)能，該系統(tǒng)專用設(shè)置了可以使水泵暫停工作的“休眠”功能，當(dāng)變頻器頻率輸出低于其下限時(shí)，變頻器停止工作，2＃、3＃泵不工作，水泵停止(處于休眠狀態(tài))。當(dāng)水壓繼續(xù)升高時(shí)將停止1泵，當(dāng)水壓下降到一定值時(shí)將先啟動變頻器運(yùn)轉(zhuǎn)2＃泵或3＃泵，當(dāng)頻率到達(dá)一定值后將啟動1＃泵調(diào)節(jié)2＃或3＃泵的轉(zhuǎn)速。
“休眠值”變頻器輸出的下限頻率PR507設(shè)置。
“休眠確認(rèn)時(shí)間”用參數(shù)PR506設(shè)置，當(dāng)變頻器的輸出頻率低于休眠值的時(shí)間如小于休眠時(shí)間td時(shí)，即td＜tn時(shí)變頻器繼續(xù)工作，當(dāng)td＞tn時(shí)變頻器將進(jìn)入休眠狀態(tài)。 “喚醒值”由供水壓力下限啟動，當(dāng)供水壓力低于下限值時(shí)由PLC發(fā)出指令喚醒變頻器工作。
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