工频耐压试验应在下述部位进行：A.电源端子与地（外壳）之间；B.输出电

The power frequency withstand voltage <br>test should be carried out at the following locations: <br>A. Between the power terminal and the ground (case); <br>B. Between the output circuit terminal and the ground (case); <br>C. The live part and the case made of (or covered by) insulating materials between. <br>The test should be a sine wave, and the frequency is allowed to be between 45 Hz and 62 Hz. The test transformer shall have sufficient capacity to maintain the test voltage against leakage currents. During type inspection, the power frequency test voltage applied at the beginning should not exceed 50% of the specified test voltage, and then the test voltage is steadily raised to the specified value and maintained for 5s. During routine (factory) inspection, it is allowed to apply the specified test voltage to the test site for 1s. <br>Between the controller power terminal and the casing, the output circuit terminal and the casing should be able to withstand the test voltage specified in the following table, and apply the 1.5 times test specified in the following table between the live parts and the casing made of insulating material (or covered). voltage value without breakdown or flashover.

Power frequency withstand voltage<br>The test shall be carried out at the following parts:<br>A. Between power terminal and ground (shell);<br>B. Between output circuit terminal and ground (shell);<br>C. Between live parts and enclosures made (or covered) of insulating materials.<br>The test shall be sine wave, and the frequency is allowed to be between 45Hz and 62 Hz. The test transformer shall have sufficient capacity to maintain the test voltage from the influence of leakage current. During type inspection, the power frequency test voltage applied at the beginning shall not exceed 50% of the specified test voltage, and then the test voltage shall be steadily increased to the specified value and maintained for 5S. During routine (delivery) inspection, it is allowed to apply 1s at the test position according to the specified test voltage.<br>Between the controller power supply terminal and the shell, and between the output circuit terminal and the shell, it shall be able to withstand the test voltage specified in the table below. 1.5 times the test voltage specified in the table below shall be applied between the live parts and the shell made (or covered) of insulating materials, without breakdown or flashover.

Power frequency withstand voltageThe test shall be carried out at the following locations:A. between the power terminal and the ground (enclosure);B. Between the output circuit terminal and the ground (housing);C. between the live parts and the enclosure made of insulating materials (or covered).The test should be sine wave, and the frequency allowed is between 45 Hz and 62 Hz. The test transformer should have enough capacity to keep the test voltage unaffected by leakage current. During type inspection, the applied power frequency test voltage at the beginning should not exceed 50% of the specified test voltage, and then the test voltage should rise to the specified value smoothly and keep it for 5s. During routine (ex-factory) inspection, it is allowed to apply the specified test voltage to the test site for 1s.Between the power supply terminal of the controller and the housing, and between the output circuit terminal and the housing, it should be able to withstand the specified test voltage specified in the following table, and 1.5 times of the test voltage specified in the following table should be applied between the live parts and the housing made of insulating materials (or covered), without breakdown or flashover.