HONEYWELL 51308386-175 CC-TDIL01工控備件機器人模塊
在延遲指定的一段時間內(nèi)，CT主要。為電機啟動和運行條件提供單獨的拾取水平和延遲。差動跳閘元件可編程為額定電流互感器的一部分。如果差動電流互感器以磁通平衡配置（3個電流互感器）連接，則可將其設置得更靈敏。如果在求和配置中使用6個CT，則在電機啟動期間，每相上的兩個CT的值可能不相等，因為CT不完全相同（不對稱電流可能導致每相上CT具有不同的輸出）。為防止該配置中的誤跳閘，可能必須將啟動差異跳閘拾取電平設置得不太敏感，或者必須延長啟動差異跳閘延遲，以便在啟動過程中度過問題期。然后可以根據(jù)應用對運行差分延遲進行微調(diào)，以使其對敏感（低）差分電流水平的響應非?？?。n相位差n[ENTER]用于更多此保護。例如，如果電機總是在2秒內(nèi)啟動，但安全失速時間為8秒，那么當熱模型將其下線時，讓電機在失速狀態(tài)下保持7或8秒是沒有意義的。此外，在這段時間內(nèi)施加到從動設備上的啟動扭矩可能會造成嚴重損壞。如果啟用，加速計時器的功能如下。當469測量到無電機電流向某個電機電流值的轉變時，假設發(fā)生電機啟動。通常，電流快速上升至超過FLA的值（例如6 x FLA）。此時，加速度計時器將用Acceleration Timer FROM START（從開始加速計時器）值（秒）初始化。如果在計時器到期之前電流未降至過載曲線拾取水平以下，則會發(fā)生加速跳閘。如果電機的加速時間是可變的，則應將此功能設置為剛好超過最長加速時間。一些電機軟起動器允許電流緩慢上升，而其他電機軟起動器在整個啟動過程中將電流限制在FLA以下。由于469是一個通用電機繼電器，它無法區(qū)分緩升時間的電機和已完成啟動并過載的電機。因此，如果電機電流在啟動后1秒內(nèi)未上升到大于滿載，則忽略加速計時器功能。在任何情況下，電機仍受到過載曲線的保護。4.8.2啟動抑制路徑：設定值×S7電機啟動×啟動抑制如果熱容量不足，啟動抑制功能可防止電機在啟動過程中跳閘。最后五次成功啟動的最大熱容量已用值乘以（1+TC已用余量），并存儲為學習啟動容量。該熱容量裕度確保電機成功啟動。如果數(shù)字大于100%，則100%存儲為學習起動容量。成功的電機啟動是指相電流從0上升到大于過載拾取，然后在加速后下降到過載曲線拾取水平以下。如果啟動抑制功能啟用，則每次電機停止時，可用熱容量（100%–使用的熱容量）與學習的啟動容量進行比較。如果可用的熱容量不超過學習的啟動容量，或不等于100%，則啟動抑制塊被激活，直到有足夠的熱容量。當發(fā)生阻塞時，鎖定時間將等于電機冷卻至可接受的啟動溫度所需的時間。該時間是S5 THERMAL MODEL（熱模型）×COOL time CONSTANT STOPPED（冷卻時間常數(shù)停止）設定值的函數(shù)。如果此功能被“關閉”，則在過載鎖定復位之前，所用熱容量必須降低至15%。如果負載因不同的起動而變化，則應關閉此功能。例如，如果最后5次啟動的熱容量分別為24%、23%、27%、25%和21%，則學習啟動容量為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)出啟動塊。當電機已經(jīng)冷卻并且所使用的熱容量水平已經(jīng)下降到66%時，
CT Primary for a period of time specified by the delay. Separate pickup levels and delays are provided for motor starting and running conditions. The Differential trip element is programmable as a fraction of the rated CT. The level may be set more sensitive if the Differential CTs are connected in a flux balancing configuration (3 CTs). If 6 CTs are used in a summing configuration, the values from the two CTs on each phase during motor starting may not be equal since the CTs are not perfectly identical (asymmetrical currents may cause the CTs on each phase to have different outputs). To prevent nuisance tripping in this configuration, the STARTING DIFF. TRIP PICKUP level may have to be set less sensitive, or the STARTING DIFF. TRIP DELAY may have to be extended to ride through the problem period during start. The running differential delay can then be fine tuned to an application such that it responds very fast to sensitive (low) differential current levels. n PHASE DIFFERENTIAL n [ENTER] for more this protection. For example, if the motor always starts in 2 seconds, but the safe stall time is 8 seconds, there is no point letting the motor remain in a stall condition for 7 or 8 seconds when the thermal model would take it off line. Furthermore, the starting torque applied to the driven equipment for that period of time could cause severe damage. If enabled, the Acceleration Timer functions as follows. A motor start is assumed to be occurring when the 469 measures the transition of no motor current to some value of motor current. Typically current rises quickly to a value in excess of FLA (e.g. 6 x FLA). At this point, the Acceleration Timer will be initialized with the ACCELERATION TIMER FROM START value in seconds. If the current does not fall below the overload curve pickup level before the timer expires, an acceleration trip will occur. If the acceleration time of the motor is variable, this feature should be set just beyond the longest acceleration time. Some motor softstarters allow current to ramp up slowly while others limit current to less than FLA throughout the start. Since the 469 is a generic motor relay, it cannot differentiate between a motor with a slow ramp up time and one that has completed a start and gone into overload. Therefore, if the motor current does not rise to greater than full load within 1 second on start, the acceleration timer feature is ignored. In any case, the motor is still protected by the overload curve. 4.8.2 START INHIBIT PATH: SETPOINTS ?× S7 MOTOR STARTING ?× START INHIBIT The Start Inhibit feature prevents motor tripping during start if there is insufficient thermal capacity. The largest THERMAL CAPACITY USED value from the last five successful starts is multiplied by (1 + TC USED MARGIN) and stored as the LEARNED STARTING CAPACITY. This thermal capacity margin ensures a successful motor start. 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, the amount of thermal capacity available (100% – THERMAL CAPACITY USED) is compared to the LEARNED STARTING CAPACITY each time the motor is stopped. If the thermal capacity available does not exceed the LEARNED STARTING CAPACITY, or is not equal to 100%, the Start Inhibit Block is activated 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 start temperature. This time is 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. For 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%,
