HONEYWELL 51308371-175 CC-TDOB01模塊備件,備件模塊
將允許啟動。如果冷卻時間常數(shù)停止設定值編程為30分鐘，則鎖定時間將等于：（EQ 4.11）n加速定時器n[ENTER]（輸入）更多加速定時器跳閘：關閉范圍：關閉、鎖定、未鎖定分配跳閘繼電器：跳閘范圍：跳閘、跳閘和輔助2、跳閘和輔2和輔助3、，跳閘和輔助3加速計時器從啟動：10.0 s范圍：1.0至250.0 s，步長為0.1 n啟動抑制n[ENTER]，用于更多啟動抑制塊：關閉范圍：打開，關閉TC使用的裕量：25%范圍：0至25%，步長為1 ENTER ESCAPE（輸入退出）? = ×t 66 90? = ln 30-------×–=9.3分鐘GE Multilin 469電機管理繼電器4-49 4設定值4.8 S7電機啟動4 4.8.3緩動塊路徑：設定值×S7電機啟動×緩動塊緩動塊功能可用于防止操作員緩動電機（快速連續(xù)多次啟動和停止）。它由兩個不同的元素組成：開始/小時和開始之間的時間。啟動/小時功能不能保證在一小時內允許一定數(shù)量的啟動或啟動嘗試；相反，它確保在一小時內不會超過一定數(shù)量的啟動嘗試。同樣，如果在最近一次啟動之后，“允許啟動之間的時間”已過，則“啟動之間的間隔”功能不保證允許再次啟動。相反，它確保了兩次啟動之間的最小時間。然而，如果第一次嘗試冷啟動由于堵塞而失敗，或者因為過程過載而需要很長時間，則熱模型可能會減少一小時內可以嘗試的啟動次數(shù)。它還可能導致鎖定時間超過可能已激活的“啟動間隔時間”鎖定。這種熱鎖定將保持，直到電機冷卻到可接受的啟動溫度。啟動/小時：當469測量到無電機電流向某個電機電流值的轉變時，假設電機啟動。此時，一個“開始/小時”計時器將加載60分鐘。即使啟動嘗試失敗，也會記錄為該功能的啟動。電機停止后，將過去一小時內的啟動次數(shù)與允許的啟動次數(shù)進行比較。如果這兩個數(shù)字相同，則會發(fā)生塊。如果發(fā)生阻塞，鎖定時間將等于從過去一小時內開始以來經過的最長時間，減去一小時。例如，如果最大啟動/小時允許編程為“2”，?一次啟動發(fā)生在T=0分鐘，?第二次啟動發(fā)生于T=17分鐘，?電機停止在T=33分鐘，?發(fā)生阻塞，?鎖定時間為1小時–33分鐘=27分鐘。啟動之間的時間當469測量無電機電流到某個電機電流值的轉變時，假設電機啟動。此時，“啟動之間的時間”計時器將加載輸入的時間。即使啟動嘗試失敗，也會記錄為該功能的啟動。一旦電機停止，如果自最近一次啟動以來經過的時間小于“允許啟動之間的時間”設定值，則會發(fā)生阻塞。如果發(fā)生塊，則鎖定時間將等于從最近一次啟動后經過的時間減去“允許啟動之間的時間”。值“0”有效地禁用了此元素。例如，如果“允許啟動之間的時間”編程為25分鐘。如果在T=0分鐘時啟動，?在T=12分鐘時停止電機，?發(fā)生阻塞，?如果在停止電機和重新啟動電機之間經過一定時間，則鎖定時間將為25分鐘–12分鐘=13分鐘n JOGGING block n[ENTER]。該計時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，液體可能會從管道中回落，并使轉子向后旋轉。
a start will be permitted. If the COOL TIME CONSTANT STOPPED setpoint is programmed for 30 minutes, the lockout time will be equal to: (EQ 4.11) n ACCELERATION TIMER n [ENTER] for more ACCELERATION TIMER TRIP: Off Range: Off, Latched, Unlatched ASSIGN TRIP RELAYS: Trip Range: Trip, Trip & Auxiliary2, Trip & Aux2 & Aux3, Trip & Auxiliary3 ACCELERATION TIMER FROM START: 10.0 s Range: 1.0 to 250.0 s in steps of 0.1 n START INHIBIT n [ENTER] for more START INHIBIT BLOCK: Off Range: On, Off TC USED MARGIN: 25% Range: 0 to 25% in steps of 1 ENTER ESCAPE e e MESSAGE ESCAPE MESSAGE ESCAPE ENTER ESCAPE e e MESSAGE ESCAPE TCused TCused_start e –t ? τ = × 66% 90% e –t ? 30 ? = × t 66 90 ? = ln 30 ------ × – = 9.3 minutes GE Multilin 469 Motor Management Relay 4-49 4 SETPOINTS 4.8 S7 MOTOR STARTING 4 4.8.3 JOGGING BLOCK PATH: SETPOINTS ?× S7 MOTOR STARTING ?× JOGGING BLOCK The Jogging Block feature may be used to prevent operators from jogging the motor (multiple starts and stops performed in rapid succession). It consists of two distinct elements: Starts/Hour and Time Between Starts. The Starts/Hour feature does not guarantee that a certain number of starts or start attempts will be allowed within an hour; rather, it ensures that a certain number of start attempts will not be exceeded within an hour. Similarly, the Time Between Starts feature does not guarantee another start will be permitted if the TIME BETWEEN STARTS PERMISSIBLE elapses after the most recent start. Rather, it ensures a minimum time between starts. If however, the first start attempt from cold is unsuccessful due to a jam or it takes long because the process is overloaded, the Thermal Model might reduce the number of starts that can be attempted within an hour. 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. 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. 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 n JOGGING BLOCK n [ENTER] f 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.
