Summary of basic debugging steps of S120 driver

S120 Summary of basic debugging steps of the drive

One 、 Rectifier cabinet commissioning

 DC busbar measurement before power on
Measure the insulation resistance of DC busbar to ground ： One is very small to the ground, thousands of ohms , But never short circuit ; DC interphase resistance is infinite , After changing the probe, the characteristic resistance of the diode is very small ;
24V Busbar measurement ： The ground cannot be zero （24V Right on the ground 7.2M,24V Negative to ground 5.1 o ）;

 Voltage measurement of rectifier cabinet
Incoming voltage measurement of rectifier incoming cabinet （ The deviation is positive or negative 10%）
Measure the phase between the incoming voltage of the rectifier incoming cabinet and the firing voltage of the precharge circuit breaker （ The phase should be the same ）, Phase measurement of incoming voltage of rectifier incoming cabinet and other rectifier incoming voltage （ The phase should be the same ）;（ The voltage with the same phase is 0, Phase different voltage 690V）

Be careful ： The multimeter should be in the AC voltage range , Don't get me wrong ！

The pre charging circuit breaker of rectifier cabinet is on fire and K4 Measure the resistance value of the ignition resistance of the precharge contactor （ Notice the resistance
files , The resistance value of the same phase is zero , The resistance value of the same phase is not infinite ）;

 Test the closing and opening logic
High voltage power failure , The closing coil of the incoming circuit breaker is removed X27 terminal , Short circuit several rectifier cabinets X9 Of 3、4 End
Sub precharge completion signal