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关 键 词:工控备件,进口NI,模块,自动化
行 业:机械 电工电气 电热设备
发布时间:2023-07-28
PXI-6220模块
PXI-6220模块
一、概述 空调是对室内空气进行统一调节的专用系统,它通过室内采样温度、湿度,与设定的温度和湿度比较,按照一定的算法,对比例调节阀、加热器、加湿器、进/出气阀门、泵等设备进行控制,调节室内温度、湿度,达到设定的要求,提高的舒适度。 某空调设备厂生产的空调采用的是进口专用控制器,有以下缺点:价格比较贵、无法改进控制工艺、抗干扰能力差。他们需要一种价格比较合适,能按照要求编写控制程序且修改程序很方便、抗干扰能力强的空调控制器。北京凯迪恩公司与空调设备厂合作,利用国产KDN系列PLC高可靠性、高性能(能同时进行6路PID运算和浮点运算)特点,开发出空调控制器,效果非常好。 二、工艺要求 1.启动—》送风电机主接触器工作,同时Y型接触器工作,5秒(可设定)后转为三角运行; --》 延时30秒检测气流传感器(待机状态不检测),不正常—报警 --》 正常,读入温度湿度传感器参数:T(温度),RH(湿度); --》 与设定值相比较; 2.夏季工况—》T>设定值范围(T1士2);制冷比例积分阀打开,开度由PID自整定; T=设定值范围(T1士2);制冷比例积分阀保持开度(由PID自整定); T<设定值范围(t1士2);制冷比例积分阀保持关闭(由pid自整定); —》当温度降到小于T1 2,RH>设定值范围(RH士10%); 除湿程序启动;分级投入加热器和分级断开加热器。 3.冬季工况—》T<设定值范围(t1士2);制热比例积分阀(与制冷比例积分阀同一阀)打开,开度由pid自整定; T=设定值范围(T1士2);制热比例积分阀保持开度(由PID自整定); T>设定值范围(T1士2);制热比例积分阀保持关闭(由PID自整定); —》当温度比较低,只靠制热比例积分阀不能把温度比较快提升上来时,要投入电加器。分级投入加热器和分级断开加热器。; 4.加湿程序夏季工况和冬季工况是相同的。
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