Abbdcf503a excitation module maintenance

Abbdcs500 DC drives are widely used in metallurgy, mining, aluminum rolling extension of production situations. Dcf503a / dcf504a (b) excitation module is specifically supporting high-power DC motor excitation control output module, and sdcs-con-2x control board communications, providing accurate excitation current. Dcf503 is an early product, not only can drink dcs500 governor supporting the use, and can also dcs600 Control Series, dcs800 Control Series match use. Dcf503a (b) maintenance of excitation module also has a difficulty, is not sdcs-con-2x control board, it is difficult to achieve communication control tests also can not modify the parameters. Dedicated 232 programming interface must meet the cable and software to achieve. This is on the market already rare dcf503a excitation module, a lot of maintenance personnel are no such conditions. To resolve the problem (except debugging), you get to know dcf503a required hardware control circuit. Hardware circuitry is software support, general hardware failure and more software applications need to save out of the 93c66 inside parameter. Dcf503a field supply circuit mainly by the auxiliary power supply excitation power detection circuit, the excitation current detection circuit, auxiliary power detection circuit, reset circuit, drive circuit and control communication circuit 485, 232 debug communications circuits, address code setting circuit. Wherein the auxiliary power supply can then be used directly between 110-220v, lower than 90v alarm f81.485 communication circuit and the control board to maintain communication. Excitation power supply voltage detector detects the one hand, the level of the operating voltage and frequency when receiving the quality of the work, the necessary response to the master board information. Excitation is to provide accurate excitation current feedback circuit. According to the actual mapping diagram analysis, dcf503a reset circuit is more complex, while the reset output high and low reset, provided cpu and memory reset, while also controlling the driving logic. Maintenance Example: The user sent a dcf503a-0050, online symptom is able to start a current output, but no response signal stop jumping. Since hand No abbdcs500 governor-line test, it adopted a separate test repair methods. According to failure analysis provided by the user, can correct line, 485 normal, the normal power supply, the fault should be out in the field voltage detection circuit, after careful testing and found that the presence of excitation power supply detection voltage u / v obvious differences, exchange phase voltage, the fault persists . Remove the normal resistance resistance testing, re-static tests found a7 patch clamp diode leakage, new ones, the same voltage. To ensure that customers can use, the unit circuit dcf503a test again, were normal. Installed sent back to the customer, the customer troubleshooting.