ABB 48990001-NK

操作原理和应用场合

CM系列热敏电阻电机保护继电器用于装有PTC温度传感器的电机控制。PTC温度传感器与电机绕组-起测量电机发热。这样可直接监视下列工作状态:

■重载启动

■增加开关频率

■单相操作

■高环境温度

■冷却不充分

■中断操作

■不平衡

继电器相对于电机额定电流、绝缘等级和起动方式是独立的。

PTC与端子Ta和Tb串联连接(或Ta和Tbx不带短路测试)。每个测量回路可以接入的PTC传感器的数量由每个PTC传感器的电阻的总和限定。RG=R1 +R2+ RN≤1.5K 2

在额定操作条件下电阻低于响应阈值。只要有一个PTC电阻发热超

出阈值，输出继电器复位。

如果设定了自动复位功能，输入继电器会在冷却之后自动动作。带手动(前而板按钮)或远程复位功能的器件必须通过控制输入信号控制。

其它应用范围

集成PTC传感器的设备的温度监视:

机械旋转轴承

■热风通风

■油

■气

■供热设备等

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