HONEYWELL CC-TAIN11工控備件模塊
999999.9秒，步長0.1。如果SELECT CURVE STYLE為“Standard”，則無法更改。在5.00 x FLA時跳閘時間：14.6秒范圍：0.5至99999秒，步長0.1。如果SELECT CURVE STYLE為“Standard”，則無法更改。5.50 x FLA跳閘時間：12.0s范圍：0.5至99999.9s，步長0.1。如果SELECT CURVE STYLE為“Standard”，則無法更改。6.00 x FLA:10.0 s時跳閘時間范圍：0.5至99999.9s，步長0.1。如果SELECT CURVE STYLE為“Standard”，則無法更改。4已在環(huán)境溫度下沉淀。對于大多數(shù)電機，電機熱極限的不同特性形成了平滑的均勻曲線。有時只提供安全的失速時間。如果電機設計保守，并且能夠在不影響熱極限的情況下輕松完成所需的工作，這是可以接受的。在這種情況下，保護可以是保守的，并且過程完整性不會受到損害。如果電機在按要求運行時設計得非常接近其熱極限，則熱極限的獨特特性變得重要。469過載曲線可以采用三種格式之一：標準、自定義曲線或電壓相關。無論所選的曲線樣式如何，熱記憶都保留在A1 STATUS？MOTOR STATUS？馬達熱容量已使用寄存器中。使用以下公式每100 ms更新一次該寄存器：（EQ 4.1）其中：time_to_trip=根據(jù)FLA從Ieq處的過載曲線獲得的時間。過載保護曲線應始終設置為略低于制造商提供的熱限值。這將確保電機在達到熱極限之前跳閘。a） 標準過載曲線如果電機啟動時間在安全失速時間內(nèi)，建議使用469標準過載曲線。標準過載曲線是一系列15條曲線，具有基于典型電機熱極限曲線的共同曲線形狀（見下圖和下表）。圖4–6:469標準過載曲線TCused t TCused t-100ms 100 ms跳閘時間=+--------------------------×100%x1 x15 100000 1000 10 1.00 0.10 1.00滿載安培數(shù)時間的倍數(shù)10 100 1000 806804A5.CDR GE Multilin 469電機管理繼電器4-33 4設定點4.6 S5熱模型4高于8.0 x拾取，使用8.0的跳閘時間。這防止過載曲線充當瞬時元件。標準過載曲線方程為：（EQ 4.2）表4–1:469標準過載曲線倍增器拾取水平標準電機管理繼電器GE Multilin 4.6 S5熱模型4設定值4 b）自定義過載曲線如果電機啟動電流開始違反熱損傷曲線，可能需要使用定制曲線來調(diào)整電機保護，從而可以在不損害保護的情況下成功啟動。此外，啟動熱損傷曲線（鎖定轉子和加速度）和運行熱損傷曲線的特性可能不會很平滑地擬合在一起。在這種情況下，可能需要定制曲線，以根據(jù)電機熱極限調(diào)整電機保護，從而可以成功啟動，并在不損害保護的情況下充分利用其潛力。熱極限曲線的不同部分現(xiàn)在變得更加關鍵。對于這些條件，建議使用469自定義曲線熱模型。自定義過載曲線功能允許用戶通過輸入30個預定電流水平的跳閘時間來編程自己的曲線。如下圖所示，如果運行過載熱極限曲線與鎖定轉子過載曲線平滑成一條曲線，則電機無法在80%線路電壓下啟動。需要自定義曲線。圖4-7：自定義曲線示例在不連續(xù)間隔期間，兩個行程時間中的較長者用于
9999.9 s in steps of 0.1. Cannot be altered if SELECT CURVE STYLE is “Standard”. TIME TO TRIP AT 5.00 x FLA: 14.6 s Range: 0.5 to 99999.9 s in steps of 0.1. Cannot be altered if SELECT CURVE STYLE is “Standard”. TIME TO TRIP AT 5.50 x FLA: 12.0 s Range: 0.5 to 99999.9 s in steps of 0.1. Cannot be altered if SELECT CURVE STYLE is “Standard”. TIME TO TRIP AT 6.00 x FLA: 10.0 s Range: 0.5 to 99999.9 s in steps of 0.1. Cannot be altered if SELECT CURVE STYLE is “Standard”. 4 have settled at ambient temperature. For most motors, the distinct characteristics of the motor thermal limits are formed into a smooth homogeneous curve. Sometimes only a safe stall time is provided. This is acceptable if the motor has been designed conservatively and can easily perform its required duty without infringing on the thermal limit. In this case, the protection can be conservative and process integrity is not compromised. If a motor has been designed very close to its thermal limits when operated as required, then the distinct characteristics of the thermal limits become important. The 469 overload curve can take one of three formats: Standard, Custom Curve, or Voltage Dependent. Regardless of the selected curve style, thermal memory is retained in the A1 STATUS ? MOTOR STATUS ?× MOTOR THERMAL CAPACITY USED register. This register is updated every 100 ms using the following equation: (EQ 4.1) where: time_to_trip = time taken from the overload curve at Ieq as a function of FLA. The overload protection curve should always be set slightly lower than the thermal limits provided by the manufacturer. this will ensure that the motor is tripped before the thermal limit is reached. a) STANDARD OVERLOAD CURVES If the motor starting times are well within the safe stall times, it is recommended that the 469 Standard Overload Curve be used. The standard overload curves are a series of 15 curves with a common curve shape based on typical motor thermal limit curves (see the figure and table below). Figure 4–6: 469 STANDARD OVERLOAD CURVES TCused t TCused t – 100ms 100 ms time to trip = + --------------------------- × 100% x1 x15 100000 10000 1000 100 10 1.00 0.10 1.00 MULTIPLE OF FULL LOAD AMPS TIME IN SECONDS 10 100 1000 806804A5.CDR GE Multilin 469 Motor Management Relay 4-33 4 SETPOINTS 4.6 S5 THERMAL MODEL 4 Above 8.0 x Pickup, the trip time for 8.0 is used. This prevents the overload curve from acting as an instantaneous element. The standard overload curves equation is: (EQ 4.2) Table 4–1: 469 STANDARD OVERLOAD CURVE MULTIPLIERS PICKUP LEVEL STANDARD Motor Management Relay GE Multilin 4.6 S5 THERMAL MODEL 4 SETPOINTS 4 b) CUSTOM OVERLOAD CURVE If the motor starting current begins to infringe on the thermal damage curves, it may become necessary to use a custom curve to tailor the motor protection so that successful starting may occur without compromising protection. Furthermore, the characteristics of the starting thermal damage curve (locked rotor and acceleration) and the running thermal damage curves may not fit together very smoothly. In this instance, a custom curve may be necessary to tailor motor protection to the motor thermal limits so it may be started successfully and be utilized to its full potential without compromising protection. The distinct parts of the thermal limit curves now become more critical. For these conditions, it is recommended that the 469 custom curve thermal model be used. The custom overload curve feature allows the user to program their own curve by entering trip times for 30 pre-determined current levels. As seen in the figure below, if the running overload thermal limit curve were smoothed into one curve with the locked rotor overload curve, the motor could not start at 80% line voltage. A custom curve is required. Figure 4–7: CUSTOM CURVE EXAMPLE During the interval of discontinuity, the longer of the two trip times is used to
