TRIPLEX T9431 DCS模塊卡件
1+TC使用余量）并存儲為A3學(xué)習數據\電機啟動(dòng)\學(xué)習啟動(dòng)容量。該熱容量裕度確保電機啟動(dòng)成功。如果數字大于100%，則100%存儲為學(xué)習起動(dòng)容量。成功的電機啟動(dòng)是指相電流從0上升到大于過(guò)載拾取，然后在加速后下降到過(guò)載曲線(xiàn)拾取水平以下。如果啟動(dòng)抑制功能啟用，則每次電機停止時(shí)，可用的熱容量（100%–使用的熱容量）與學(xué)習的啟動(dòng)容量進(jìn)行比較。如果可用的熱容量不超過(guò)學(xué)習的啟動(dòng)容量，或不等于100%，則啟動(dòng)抑制塊將激活，直到有足夠的熱容量。當發(fā)生阻塞時(shí)，鎖定時(shí)間將等于電機冷卻到可接受的啟動(dòng)溫度所需的時(shí)間。該時(shí)間是S5熱模型\熱模型\冷卻時(shí)間常數停止設定值的函數。如果此功能被“關(guān)閉”，則在過(guò)載鎖定復位之前，所用熱容量必須降低至15%。如果負載因不同的起動(dòng)而變化，則應關(guān)閉此功能。b） 示例：如果最后5次啟動(dòng)的熱容量分別為24%、23%、27%、25%和21%，則學(xué)習啟動(dòng)容量為27%×1.25=33.75%。如果電機在使用90%熱容量的情況下停止，將發(fā)出啟動(dòng)塊。當電機冷卻且所用熱容量降至66%時(shí)，允許啟動(dòng)。如果冷卻時(shí)間恒定停止設定點(diǎn)編程30分鐘，鎖定時(shí)間將等于：? 啟動(dòng)禁止? [輸入]更多起動(dòng)抑制塊：關(guān)閉范圍：打開(kāi)，關(guān)閉TC已用余量：25%范圍：0至25%，step：1 ENTER ESCAPE?信息ESCAPE TCused TCused GE Power Management 469 Motor Management Relay 4-55 4 SETPOINT PROGRAMMING 4.8 S7 Motor STARTING 4 4.8.3 JOGGING BLOCK（點(diǎn)動(dòng)塊）功能點(diǎn)動(dòng)塊功能可用于防止操作員點(diǎn)動(dòng)電機（快速連續進(jìn)行多次啟動(dòng)和停止）。它由兩個(gè)不同的元素組成：開(kāi)始/小時(shí)和開(kāi)始之間的時(shí)間。啟動(dòng)/小時(shí)功能不能保證在一小時(shí)內允許一定數量的啟動(dòng)或啟動(dòng)嘗試；相反，它確保在一小時(shí)內不會(huì )超過(guò)一定數量的啟動(dòng)嘗試。同樣，如果在最近一次啟動(dòng)之后，“允許啟動(dòng)之間的時(shí)間”已過(guò)，則“啟動(dòng)之間的間隔”功能不保證允許再次啟動(dòng)。相反，它確保了兩次啟動(dòng)之間的最小時(shí)間。然而，如果第一次嘗試冷啟動(dòng)由于堵塞而失敗，或者因為過(guò)程過(guò)載而需要很長(cháng)時(shí)間，則熱模型可能會(huì )減少一小時(shí)內可以嘗試的啟動(dòng)次數。
1 + TC USED MARGIN) and stored as A3 LEARNED DATA\MOTOR STARTING\LEARNED STARTING CAPACITY. This thermal capacity margin ensures that a motor start will be successful. If the number is greater than 100%, 100% is stored as LEARNED STARTING CAPACITY. A successful motor start is one in which phase current rises from 0 to greater than overload pickup and then, after acceleration, falls below the overload curve pickup level. If the Start Inhibit feature is enabled, each time the motor is stopped, the amount of thermal capacity available (100% – THERMAL CAPACITY USED) is compared to the LEARNED STARTING CAPACITY. If the thermal capacity available does not exceed the LEARNED STARTING CAPACITY, or is not equal to 100%, the Start Inhibit Block will become active until there is sufficient thermal capacity. When a block occurs, the lockout time will be equal to the time required for the motor to cool to an acceptable temperature for a start. This time will be a function of the S5 THERMAL MODEL\THERMAL MODEL\COOL TIME CONSTANT STOPPED setpoint. If this feature is turned "Off", the THERMAL CAPACITY USED must reduce to 15% before an overload lockout resets. This feature should be turned off if the load varies for different starts. b) EXAMPLE If the THERMAL CAPACITY USED for the last 5 starts is 24, 23, 27, 25, and 21% respectively, the LEARNED STARTING CAPACITY is 27% × 1.25 = 33.75% used. If the motor stops with 90% thermal capacity used, a start block will be issued. When the motor has cooled and the level of thermal capacity used has fallen to 66%, a start will be permitted. If the COOL TIME CONSTANT STOPPED setpoint is programmed for 30 minutes, the lockout time will be equal to: ? START INHIBIT ? [ENTER] for more START INHIBIT BLOCK: Off Range: On, Off TC USED MARGIN: 25% Range: 0 to 25%, step: 1 ENTER ESCAPE e e MESSAGE ESCAPE TCused TCused GE Power Management 469 Motor Management Relay 4-55 4 SETPOINT PROGRAMMING 4.8 S7 MOTOR STARTING 4 4.8.3 JOGGING BLOCK a) FUNCTION 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.
