Electrical performance of the power module is presented through a series of tests , the following general functional test project , as detailed below :
First, the definition of the power supply regulation regulation of its ability to provide a stable output voltage when the input power supply voltage variations. Test procedure is as follows : the power supply in the test engine after heat stable under normal input voltage and load conditions , respectively, in a low input voltage (Min), the normal input voltage (Normal), and high input voltage (Max) and record the measured The output voltage value. Power adjustment rate is usually fixed to a normal load (Nominal Load) , the percentage change caused by the input voltage output voltage deviation micro smart plc (deviation) , as shown in the following formula : Define two , load regulation Load regulation is switching power supply when the output load current changes, its ability to provide a stable output voltage . Test procedure is as follows : plc analog input modules in the power supply to the test input voltage under normal load conditions and the stability of the heat engine , the measured value of the normal output voltage under load , and then were light load (Min), overload (Max) Load Next , measure and record the output voltage value ( respectively Vo (max) and Vo (min)), load regulation is usually normal fixed input voltage, load current changes caused by the output voltage deviation rate percentage , as the following equation: Third , the definition of a comprehensive regulation for the comprehensive regulation of the power supply to the input voltage and output load current changes, its ability to provide a stable output voltage . This is a comprehensive line regulation and load regulation , and this test system for the synthesis power regulation and load regulation , which provides for the power supply to changes in input voltage and load conditions more accurate performance verification . Comprehensive regulation in industrial automation plc the following ways: on input voltage and output load current changes , the output voltage deviation shall be within the range specified above the lower voltage ( ie, less than the absolute value of the output voltage above the lower limit ) or as a percentage of the boundaries four , plc analog input modules output noise output noise (PARD) refers to the input voltage and output load current are constant , periodic and random deviation of the average DC output voltage of the voltage. Output noise is after all the unwanted part exchanges and noise on the regulator and filtered DC output voltage ( 50/60Hz power frequency signal containing the low-frequency , high frequency above 20 KHz switching signal and its harmonic wave, and then the other of the plc analog io module composition and the random signal ) ) , usually mVp-p is a peak-to -peak voltage is expressed in units . General specifications are output switching power supply DC output voltage of less than 1% of output noise specification , the bandwidth of 20Hz to 20MHz. The actual work when the power is the worst situation ( such as maximum output load current , input supply voltage minimum , etc. )
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