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三晶变频器在恒压供水上的应用及参数设置                                                                                                                                      1、F039以实际需要一般设定为外部端子控制、即F039=2                                                                                                            2、 F040=40输出频率由PID输出决定                                                                                                                                              3、 F041=50PID启动、即MII功能选择为PID启动功能                                                                                                                  4 、F073=0.1PID输入选择、0表示PID的设定来源 、由F027设定，1表示PID的反馈值来源、即摸拟输入VI为来源     5、F027=50%设定值来源、PID(系统要求压力)