ICS TRIPLEX T9300處理器卡件,ABB卡件
它還可能導致鎖定時(shí)間超過(guò)可能已激活的“啟動(dòng)間隔時(shí)間”鎖定。這種熱鎖定將保持，直到電機冷卻到可接受的啟動(dòng)溫度。b） 啟動(dòng)/小時(shí)當469測量到無(wú)電機電流過(guò)渡到某個(gè)電機電流值時(shí)，假設電機啟動(dòng)。此時(shí)，一個(gè)“開(kāi)始/小時(shí)”計時(shí)器將加載60分鐘。即使啟動(dòng)嘗試失敗，也會(huì )記錄為該功能的啟動(dòng)。電機停止后，將過(guò)去一小時(shí)內的啟動(dòng)次數與允許的啟動(dòng)次數進(jìn)行比較。如果這兩個(gè)數字相同，則會(huì )發(fā)生塊。如果發(fā)生阻塞，鎖定時(shí)間將等于從過(guò)去一小時(shí)內開(kāi)始以來(lái)經(jīng)過(guò)的最長(cháng)時(shí)間，減去一小時(shí)。例如，如果最大啟動(dòng)/小時(shí)允許編程為“2”，?一次啟動(dòng)發(fā)生在T=0分鐘，?第二次啟動(dòng)發(fā)生于T=17分鐘，?電機停止在T=33分鐘，?發(fā)生阻塞，?鎖定時(shí)間為1小時(shí)–33分鐘=27分鐘。c） 啟動(dòng)之間的時(shí)間當469測量到無(wú)電機電流過(guò)渡到某個(gè)電機電流值時(shí)，假設電機啟動(dòng)。此時(shí)，“啟動(dòng)之間的時(shí)間”計時(shí)器將加載輸入的時(shí)間。即使啟動(dòng)嘗試失敗，也會(huì )記錄為該功能的啟動(dòng)。一旦電機停止，如果自最近一次啟動(dòng)以來(lái)經(jīng)過(guò)的時(shí)間小于“允許啟動(dòng)之間的時(shí)間”設定值，則會(huì )發(fā)生阻塞。如果發(fā)生塊，則鎖定時(shí)間將等于從最近一次啟動(dòng)后經(jīng)過(guò)的時(shí)間減去“允許啟動(dòng)之間的時(shí)間”。值“0”有效地禁用了此元素。例如，如果“允許啟動(dòng)之間的時(shí)間”編程為25分鐘。?在T=0分鐘時(shí)啟動(dòng)，?在T=12分鐘時(shí)電機停止，?發(fā)生阻塞，?鎖定時(shí)間為25分鐘–12分鐘=13分鐘? 緩動(dòng)滑車(chē)? [輸入]更多JOGGING BLOCK:Off Range：開(kāi)，關(guān)最大允許啟動(dòng)/小時(shí)：3范圍：1到5，步驟1允許啟動(dòng)之間的時(shí)間：10分鐘范圍：0到500分鐘。，步驟1輸入退出消息退出消息退出4-56 469電機管理繼電器GE電源管理4.8 S7電機啟動(dòng)4設定點(diǎn)編程4 4.8.4重啟塊重啟塊功能可用于確保在停止電機和重啟電機之間經(jīng)過(guò)一定時(shí)間。該計時(shí)器功能對于某些工藝應用或電機考慮可能非常有用。如果電機在井下泵上，在電機停止后，液體可能會(huì )從管道中回落，并使轉子向后旋轉。此時(shí)啟動(dòng)電機是非常不可取的。在另一種情況下，電機可能驅動(dòng)非常高的慣性負載。一旦電機的電源斷開(kāi)，轉子可能會(huì )在減速時(shí)繼續轉動(dòng)很長(cháng)一段時(shí)間。電機現在變成了發(fā)電機，施加異相電源電壓可能會(huì )導致災難性故障。
It may also cause a lockout time that exceeds a Time Between Starts lockout that may have been active. Such a thermal lockout will remain until the motor has cooled to an acceptable temperature for a start. b) STARTS / HOUR A motor start is assumed to be occurring when the 469 measures the transition of no motor current to some value of motor current. At this point, one of the Starts/Hour timers is loaded with 60 minutes. Even unsuccessful start attempts will be logged as starts for this feature. Once the motor is stopped, the number of starts within the past hour is compared to the number of starts allowable. If the two numbers are the same, a block will occur. If a block occurs, the lockout time will be equal to the longest time elapsed since a start within the past hour, subtracted from one hour. For example, if MAX. STARTS/HOUR PERMISSIBLE is programmed at "2", ? one start occurs at T = 0 minutes, ? a second start occurs at T = 17 minutes, ? the motor is stopped at T = 33 minutes, ? a block occurs, ? the lockout time would be 1 hour – 33 minutes = 27 minutes. c) TIME BETWEEN STARTS A motor start is assumed to be occurring when the 469 measures the transition of no motor current to some value of motor current. At this point, the Time Between Starts timer is loaded with the entered time. Even unsuccessful start attempts will be logged as starts for this feature. Once the motor is stopped, if the time elapsed since the most recent start is less than the TIME BETWEEN STARTS PERMISSIBLE setpoint, a block will occur. If a block occurs, the lockout time will be equal to the time elapsed since the most recent start subtracted from the TIME BETWEEN STARTS PERMISSIBLE. A value of "0" effectively disables this element. For example, if TIME BETWEEN STARTS PERMISSIBLE is programmed = 25 min. ? a start occurs at T = 0 minutes, ? the motor is stopped at T = 12 minutes, ? a block occurs, ? the lockout time would be 25 minutes – 12 minutes = 13 minutes ? JOGGING BLOCK ? [ENTER] for more JOGGING BLOCK: Off Range: On, Off MAX. STARTS/HOUR PERMISSIBLE: 3 Range: 1 to 5, step 1 TIME BETWEEN STARTS PERMISSIBLE: 10 min. Range: 0 to 500 min., step 1 ENTER ESCAPE e e MESSAGE ESCAPE MESSAGE ESCAPE 4-56 469 Motor Management Relay GE Power Management 4.8 S7 MOTOR STARTING 4 SETPOINT PROGRAMMING 4 4.8.4 RESTART BLOCK The Restart Block feature may be used to ensure that a certain amount of time passes between stopping a motor and restarting that motor. This timer feature may be very useful for some process applications or motor considerations. If a motor is on a down-hole pump, after the motor stops, the liquid may fall back down the pipe and spin the rotor backwards. It would be very undesirable to start the motor at this time. In another scenario, a motor may be driving a very high inertia load. Once the supply to the motor is disconnected, the rotor may continue to turn for a long period of time as it decelerates. The motor has now become a generator and applying supply voltage out of phase may result in catastrophic failure.
