IPM06A CM902WX工控模块卡件
4.6 S5热模型4设定值编程4 4.6.6热/冷曲线比率电机制造商可提供热/冷电机的热极限信息。如果编程了热/冷曲线比率设定值，469热模型将适应这些条件。该设定值规定了继电器在电流水平低于过载拾取水平时所使用的热容量水平。当电机以低于过载拾取水平的水平运行时，所用热容量寄存器将上升或下降至基于平均相电流和热/冷曲线比率设定值的值。所用热容量将以每分钟5%的固定速率上升，或根据运行冷却时间常数下降。其中：TCused_end=如果Iper_unit保持稳定状态，则使用的热容量Ieq=等效电机加热电流热/冷=热/冷曲线比率设定值热/冷的曲线比率可根据热极限曲线（如果提供）或热/冷安全失速时间确定。只需将热安全失速时间除以冷安全失速时间。如果未提供热时间和冷时间，则不存在差异，热/冷曲线比率应输入为“1.00”。4.6.7 RTD偏差469热复制品作为一个完整的独立模型运行。然而，热过载曲线仅基于测量电流，假设环境温度为40°C，电机冷却正常。如果环境温度异常高，或电机冷却受阻，电机温度将升高。如果电机定子具有嵌入式RTD，则应使用469 RTD偏置特性来校正热模型。RTD偏置特性为两部分曲线，由3个点构成。如果最大定子RTD温度低于RTD偏置最小设定值（通常为40°C），则不会发生偏置。如果最大定子RTD温度高于RTD BIAS maximum设定值（通常在定子绝缘额定值或稍高），则热存储器完全偏置，所用热容量强制为“100%”。在最大值和最小值之间，将过载曲线和热模型创建的热容量与RTD偏置曲线中使用的RTD偏置热容量进行比较。如果使用的RTD偏置热容量值较高，则从该点开始使用该值。RTD偏置中心点应设置在额定电机运行温度。469使用热/冷安全失速比设定值自动确定中心点的热容量使用值。在<RTD_Bias_Center温度时，在>RTD_Biis_Center时，其中：RTD_Bias _TCused=因最热定子RTD而使用的TC Tempacual=最热定子的当前温度RTD Tempmin=RTD偏置最小设定点Tempcenter=RTD
4.6 S5 THERMAL MODEL 4 SETPOINT PROGRAMMING 4 4.6.6 HOT/COLD CURVE RATIO The motor manufacturer may provide thermal limit information for a hot/cold motor. The 469 thermal model adapts for these conditions if the HOT/COLD CURVE RATIO setpoint is programmed. This setpoint value dictates the level of thermal capacity used the relay will settle at for current levels below the OVERLOAD PICKUP LEVEL. When the motor is running at a level that is below the OVERLOAD PICKUP LEVEL, the THERMAL CAPACITY USED register will rise or fall to a value based on the average phase current and the HOT/COLD CURVE RATIO setpoint. The THERMAL CAPACITY USED will either rise at a fixed rate of 5% per minute or fall as dictated by the running cool time constant. where: TCused_end = THERMAL CAPACITY USED if Iper_unit remains steady state Ieq = equivalent motor heating current hot / cold = HOT/COLD CURVE RATIO setpoint The HOT/COLD CURVE RATIO may be determined from the thermal limit curves if provided or the hot and cold safe stall times. Simply divide the hot safe stall time by the cold safe stall time. If hot and cold times are not provided, there can be no differentiation and the HOT/COLD CURVE RATIO should be entered as "1.00". 4.6.7 RTD BIAS The 469 thermal replica operates as a complete and independent model. The thermal overload curves however, are based solely on measured current, assuming a normal 40°C ambient and normal motor cooling. If the ambient temperature is unusually high, or if motor cooling is blocked, the motor temperature will increase. If the motor stator has embedded RTDs, the 469 RTD bias feature should be used to correct the thermal model. The RTD bias feature is a two-part curve, constructed using 3 points. If the maximum stator RTD temperature is below the RTD BIAS MINIMUM setpoint (typically 40°C), no biasing occurs. 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. At < RTD_Bias_Center temperature, At > RTD_Bias_Center temperature, 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
