Paralle Resonance Induction Heating Power Supply Working Condition

The parallel resonance induction power supply has been continuously optimized and verified after customers have been working on the production line for a long time, and it has been reliable and stable in heat treatment fields such as diathermy quenching.

Full digital control solves many problems of parallel power supply, with wide sweep frequency, automatic identification of multi-station optimal point, fast tracking speed and various protection functions.

1. Power on the main control board after connecting the wires to see if there is a system failure or system abnormality prompt. If so, please eliminate it before proceeding to the next step;

2. Disconnect the communication line between the IGBT main control board and the SCR rectifier board, and the two control independent test outputs. The operation mode of the rectifier board is set to "open loop", the control mode is set to "local", and the 10K potentiometer is used to adjust Output, to test whether the wiring and output of the SCR rectifier board are correct, you can use an incandescent lamp to test the output; (At the same time, pay attention to whether the voltage or current collected by the feedback board is normal)

3. The IGBT main control board enters the test mode, outputs the inverter waveform, observes the oscilloscope, the overlap time is about 3uS, and whether the output waveform is correct;

4. After the two control boards confirm that the wiring and output are correct, the IGBT main control board will output the frequency of the resonance point in the test mode, and then set the rectifier board to "open loop" and "local", and adjust the input on the display screen with the potentiometer The signal is in a low-voltage state, and the low-voltage test is output. At this time, observe whether the phase value is correct. If not, connect the inverter voltage feedback line in reverse;

5. After completing the fourth step, you can connect the communication line to the machine for the machine test. Note that the control mode of the SCR rectifier board is set to "communication" first;

6. Perform some basic parameter settings according to the following different adjustment modes (note the red font), the user must first set the protection function parameters of the system (such as rectification overcurrent, rectification overvoltage, back pressure protection value, etc.) before proceeding test;

7. After the basic parameters and protection parameters are set, the output operation of "start running" can be performed.

8. When starting the test, the set voltage output of the main interface is about 60-100V, and the low voltage test is performed first.

9. The communication line between the IGBT main control board and the SCR rectifier board: A+ B-, after being connected to each other, the SCR rectifier board is controlled by the IGBT SD320 main control board.

10. Special attention: If it is used for quenching, double-station wheel processing, because after the workpiece is heated, the sensor will be disconnected and switched to another station. At this time, it must be indicated by the "running relay" on the SD320A main control board. To control the disconnection of the sensor, ensure that the power supply is shut down before disconnecting the sensor, to prevent power interference or other control reasons, causing the power supply to still work and output while the sensor is disconnected first, resulting in tube explosion.