HONEYWELL 51410010-175 CC-PAON01模擬量輸入模塊
如果最大定子RTD溫度高于RTD BIAS maximum設(shè)定值（通常在定子絕緣額定值或稍高），則熱存儲器完全偏置，所用熱容量強制為“100%”。在最大值和最小值之間，將過載曲線和熱模型創(chuàng)建的熱容量與RTD偏置曲線中使用的RTD偏置熱容量進行比較。如果使用的RTD偏置熱容量值較高，則從該點開始使用該值。RTD偏置中心點應(yīng)設(shè)置在額定電機運行溫度。469使用熱/冷安全失速比設(shè)定值自動確定中心點的熱容量使用值。（EQ 4.8）在<RTD_Bias_Center溫度時，（EQ 4.10）式中：RTD_Bias_TCused=因最熱定子RTD而使用的TC Tempacual=最熱定子的當前溫度RTD Tempmin=RTD偏置最小設(shè)置點Tempcenter=RTD偏置中心設(shè)置點Tempmax=RTD偏置最大設(shè)置點TCused@RTD_Bias _center=由熱/冷安全失速比設(shè)置點定義的TC簡單來說，RTD偏置特性是測量定子溫度的真實反饋。該反饋用作針對不可預見情況的熱模型校正。由于RTD響應(yīng)相對較慢，RTD偏置有利于校正和減緩電機加熱。當電機加熱相對較快時，在啟動和重過載條件下需要熱模型的其余部分。需要注意的是，僅RTD偏置功能不能產(chǎn)生跳閘。如果RTD偏置特征迫使使用的熱容量達到100%，在熱/冷=0.85額定溫度=130°C絕緣額定值=155°C RTD熱容量使用前，電機電流必須高于過載傳感器4-42 469電機管理繼電器GE Multilin 4.7 S6電流元件4設(shè)定值4 4.7S6電流元件4.7.1短路跳閘路徑：設(shè)定值×S6電流元件打開此功能時必須小心短路跳閘。如果中斷裝置（接觸器或斷路器）的額定值不足以斷開故障電流，則應(yīng)禁用此功能。或者，可將該功能分配給輔助繼電器，并將其連接，以使其跳閘能夠斷開故障電流的上游設(shè)備。如果打開，短路元件的功能如下。一旦Ia、Ib或Ic的幅值超過拾取電平×相位CT一次，達到“意向S/C跳閘延遲”規(guī)定的時間段，則發(fā)生跳閘。也可以啟用備用跳閘功能。短路跳閘備用延遲應(yīng)大于預期S/C跳閘延遲加上斷路器清除時間。如果短路跳閘備份為“開”，且已啟動短路跳閘，則如果電機相電流持續(xù)超過短路跳閘備份延遲時間，則會發(fā)生第二次跳閘。第二次跳閘指定給R2或R3，R2或R3將專用于上游斷路器跳閘繼電器。各種情況（例如，向電機或功率因數(shù)校正電容器的長線充電）可能會導致電機啟動期間的瞬時涌入電流，其可能會在極短的時間內(nèi)超過短路跳閘拾取電平。意向S/C跳閘延遲可按10ms增量調(diào)整。
If the maximum stator RTD temperature is above the RTD BIAS MAXIMUM setpoint (typically at the stator insulation rating or slightly higher), then the thermal memory is fully biased and THERMAL CAPACITY USED is forced to "100%". At values between the maximum and minimum, the THERMAL CAPACITY USED created by the overload curve and the thermal model is compared to the RTD Bias thermal capacity used from the RTD Bias curve. If the RTD Bias thermal capacity used value is higher, then that value is used from that point onward. The RTD BIAS CENTER POINT should be set at the rated motor running temperature. The 469 automatically determines the THERMAL CAPACITY USED value for the center point using the HOT/COLD SAFE STALL RATIO setpoint. (EQ 4.8) At < RTD_Bias_Center temperature, (EQ 4.9) At > RTD_Bias_Center temperature, (EQ 4.10) where: RTD_Bias_TCused = TC used due to hottest stator RTD Tempacutal = current temperature of the hottest stator RTD Tempmin = RTD Bias minimum setpoint Tempcenter = RTD Bias center setpoint Tempmax = RTD Bias maximum setpoint TCused @ RTD_Bias_Center = TC used defined by the HOT/COLD SAFE STALL RATIO setpoint In simple terms, the RTD bias feature is real feedback of the measured stator temperature. This feedback acts as correction of the thermal model for unforeseen situations. Since RTDs are relatively slow to respond, RTD biasing is good for correction and slow motor heating. The rest of the thermal model is required during starting and heavy overload conditions when motor heating is relatively fast. It should be noted that the RTD bias feature alone cannot create a trip. If the RTD bias feature forces the thermal capacity used to 100%, the motor current must be above the overload pickup before Hot/Cold = 0.85 Rated Temperature=130°C Insulation Rating=155°C RTD Thermal Capacity Used 4-42 469 Motor Management Relay GE Multilin 4.7 S6 CURRENT ELEMENTS 4 SETPOINTS 4 4.7S6 CURRENT ELEMENTS 4.7.1 SHORT CIRCUIT TRIP PATH: SETPOINTS ?× S6 CURRENT ELEMENTS ? SHORT CIRCUIT TRIP Care must be taken when turning On this feature. If the interrupting device (contactor or circuit breaker) is not rated to break the fault current, this feature should be disabled. Alternatively, this feature may be assigned to an auxiliary relay and connected such that it trips an upstream device that is capable of breaking the fault current. If turned on, the Short Circuit element functions as follows. A trip occurs once the magnitude of either Ia, Ib, or Ic exceeds the Pickup Level × Phase CT Primary for a period of time specified by INTENTIONAL S/C TRIP DELAY. A backup trip feature may also be enabled. The SHORT CIRCUIT TRIP BACKUP DELAY should be greater than the INTENTIONAL S/C TRIP DELAY plus the breaker clearing time. If the SHORT CIRCUIT TRIP BACKUP is "On", and a Short Circuit trip has initiated, a second trip occurs if the motor phase current persists for a period of time exceeding the SHORT CIRCUIT TRIP BACKUP DELAY. It is intended that this second trip be assigned to R2 or R3 which would be dedicated as an upstream breaker trip relay. Various situations (e.g. charging a long line to the motor or power factor correction capacitors) may cause transient inrush currents during motor starting that may exceed the SHORT CIRCUIT TRIP PICKUP level for a very short period of time. The INTENTIONAL S/C TRIP DELAY is adjustable in 10 ms increments.
