IS200VSVOH1BDC
IS200VSVOH1BDC
IS200VSVOH1BDC
is that the dcs400 excitation control is also integrated in this board, and the dcs400 software is not support excitation off this function, which brings some difficulty to the maintenance. In the actual maintenance, abbdcs400 caused by excitation fault is the most. There is the control power supply, the control power supply of this board secondary sampling is quite strange, not online main control board, power supply will produce protection, but connected to the main control board maintenance power supply, not good will burn the motherboard, then the problem is expanded, more than worth the loss.
Case: A user repairs dcs400(500a)4q governor, the fault is the power supply hiccup, the main board digital tube is not clear out, the customer sent to repair. My analysis of power supply hiccup is divided into two steps :1.
There is a short circuit in the rear stage; 2. The sampling circuit is faulty, resulting in feedback sampling overvoltage protection. After measuring the stage impedance, static impedance has no obvious short-circuit, unplug
the excitation power supply, the fault is still, because the motherboard is not