(b) carefully observe the appearance of the main power circuit, distinguish between the accuracy and suitability of the electrical connection and the cleanness of the metaphone, and ensure that the rear covers of the transformer are not damaged or corrosive, there is no mechanical damage and parts are damaged. The plastic covers and support racks of the frequency transformer can be removed during internal tests of the abb variant。
The key operational steps of abb's retrofit are as follows:
1. Appearance testing of the radiator to ensure that it is clean and clean。
2. Test the look of the transistor heat fans to ensure that they are installed accurately and test whether they function properly。
3. Tests whether power semiconductor modules are fixed. The test was based on the integrator 0,5/2,3nm, with a module specification of 0,5/3,5nm。
4. Tests of reversible circuit boards and connections to main power circuits. In the look-ins of the abb variants, great care needs to be taken in all circuits to ensure that all circuits are fixed and that all the bolts installed are tightened up; that direct current capacitors and direct current cascades of electrical resistors are inspected; that transmissions of electrical senses are inspected; that connections within the circuit boards are checked; and that the welding status of the output power module is checked。
After the completion of the key operational steps for the maintenance of the abb transformer, the basic elements of the internal electronic component of the transformer are measured using a universal meter before the power is added to the driver system module. Key measurements include: the typed bridge test; the rapid repair of the diode test by the electric generator; the door polar test; the thermal resistance measurement of the module ntc and the charge resistance measurement of the abb variant。
The independent diode module was measured and the appearance of the diodes and modules tested at the start of the abb variant maintenance. In some cases, diodes or modules may also be damaged or burned, such as electrical isolation caused by short circuit failure within the modules。
