电机冷却时间常数当469检测到电机正在运行时,在低于过载拾取设定点的负载下，或者电机停止，它将开始减速存储的TCU值，模拟实际电机冷却过程。TCU呈指数衰减以冷却时间常数规定的速率设定值。通常是冷却过程停止的电机的速度比这慢得多运行中的电机，从而运行和停止提供了冷却时间常数设定值在继电器中反映差异。运行冷却的TCU下限曲线由热/冷安全失速比定义以及电机负载水平。TCU下部停止冷却曲线的极限为0%，并且对应于环境温度下的电机。启动禁止和紧急重启启动抑制功能可防止热容量不足时的电动机可用或电机启动监控功能指令启动禁止。紧急情况下使用的热容量和电机启动可以重置监督计时器以允许热电机启动。
SR469-P1-HI-A20-E
RTD偏置469条热过载曲线基于仅根据测量的电流，假设正常40°C环境温度和正常电机冷却。实际电机温度将由于异常高的环境温度而增加温度或电机冷却堵塞。使用电阻式温度检测器偏置功能，以增加热量所用热容量的模型计算，如果电机定子具有嵌入式RTD。RTD偏置特性是测量值的反馈定子温度。此反馈作用于修正假设的热模型。自RTD以来具有相对较慢的响应，RTD偏置用于慢速电机加热。的其他部分启动过程中需要热模型以及电机严重过载的情况加热相对较快。对于低于RTD BIAS的RTD温度最小设置，不发生偏移。对于最高定子电阻温度高于RTD偏置最大设置，热存储器被完全偏置并且被强制为100%。在介于两者之间的值下，如果电阻式温度检测器偏向热使用的容量比其他人产生的使用热容量热模型的特征，那么这个值从那一点开始使用。
SR469-P1-HI-A20-E
When 469 detects that the motor is running, under a load below the overload pickup set point, or when the motor stops, it will start decelerating the stored TCU value to simulate the actual motor cooling process. The TCU decays exponentially at the rate set by the cooling time constant. Usually, the speed of the motor that stops the cooling process is much slower than that of the motor that is in operation, thus providing a cooling time constant setting that reflects the difference in the relay between operation and stop. The TCU lower limit curve for operating cooling is defined by the hot/cold safe stall ratio and the motor load level. The limit of the cooling curve for the lower part of the TCU is 0% and corresponds to the motor at ambient temperature. The start inhibit and emergency restart start inhibit functions can prevent the motor from being available or the motor start monitoring function commands start inhibit when the thermal capacity is insufficient. The thermal capacity and motor start used in emergency situations can reset the supervision timer to allow the thermal motor to start
SR469-P1-HI-A20-E
The RTD bias 469 thermal overload curves are based solely on the measured current, assuming a normal 40 ° C ambient temperature and normal motor cooling. The actual motor temperature will increase due to abnormally high ambient temperature or motor cooling blockage. Using the bias function of a resistive temperature detector to increase the heat capacity of the model calculation, if the motor stator has an embedded RTD. The bias characteristic of RTD is the feedback stator temperature of the measured value. This feedback serves to correct the assumed thermal model. Since RTD, it has a relatively slow response, and RTD bias is used for heating slow motors. The other parts of the startup process require a thermal model and relatively fast heating when the motor is severely overloaded. For the minimum setting of RTD temperature below RTD BIAS, no offset occurs. For the highest stator resistance temperature higher than the RTD bias maximum setting, the thermal memory is fully biased and forced to 100%. At a value between the two, if the resistance temperature detector leans towards the characteristics of the thermal capacity model generated by others using thermal capacity, then this value is used from that point on.
SR469-P1-HI-A20-E
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