Insulation strength test between windings of CNC winding machine made by Weiding winding machine manufacturer, that is, winding overvoltage test. During the test, add 1.3 times the rated voltage to the tested winding and keep it for 3 minutes.
The test time can be shortened to lmin for the used winding machine or the winding machine with partial replacement of winding insulation. Qualified winding machine should be able to withstand high voltage test without fault or breakdown of winding turn-to-turn insulation.
Insulation test between AC motors Cage motors must be operated under no-load condition. For wound rotor three-phase asynchronous motor, the rotor coil should be opened when doing this test, and it should be carried out when the rotor is stationary. At this time, the voltage induced by the rotor coil will also be higher than its rated voltage by 30%. Thus, the turn-to-turn insulation of the rotor coil is tested in the same dimension. For multi-speed motors, the winding at each rated speed should be tested. If it is a single winding, only its high speed connection mode can be tested. The motor that needs overspeed test must be carried out after overspeed test.
For example, the adjustment of adjustable parts such as winding tension, screen voltage, and starting position of cable rack is a simple but effective method in maintenance. By adjusting the adjustable parts, some harmless faults are corrected. For example, if a winding machine that has been used for many years is repaired in an enterprise, its system display screen is dull and normal after adjusting the screen power supply voltage.
Under normal circumstances, the whole machine error caused by instantaneous fault of winding machine can be removed by hardware reset or switching system power supply in turn. If the working storage area of the system is in chaos due to voltage instability, the system must be initialized and cleared, and the current data backup record should be made before clearing. If the fault cannot be eliminated after reset initialization, hardware replacement diagnosis should be carried out.