At present, the control circuit board in the induction melting furnace is easily damaged. Because the control circuit board is inserted in the induction melting furnace, it cannot be repaired. After disconnection, it cannot be powered on to test. It can only be visually inspected whether the components are burned, so it is not easy to repair. In general, you can only replace the new control circuit board.
The purpose of the new model is to provide a low-cost, convenient operation, simple circuit, and maintenance and inspection instrument for the control circuit board of the induction melting furnace.
The new technical solution is realized as follows: An induction melting furnace control circuit board maintenance tester is characterized in that it includes three types of control circuit boards for the induction melting furnace, namely an inverter plug-in board, a protection plug-in board, and a rectifier plug-in. The plug-in socket function switching control circuit of the board inserted into the same socket for maintenance detection, the inverter plug-in detection circuit for maintenance detection of the inverter plug-in board, the protection plug-in detection circuit for maintenance detection of the protective plug-in board, and the rectification plug-in board Rectifier board detection circuit for maintenance inspection. The plug-in socket function switching control circuit includes a multi-triple three-pole switch group K9 and the plug-in socket CZ. The position of the switch group K9 is used to achieve a three-purpose function. The inverter plug-in detection circuit includes a DC 15V regulated power supply. Set the switch JK that can connect the 7th pin and the 26th pin of the socket. Through the switch group, the switches K1 and K3 between the ammeter A and the DC I5V can be connected in series between the 2nd, 3rd and 4th and 5th pins of the socket. The resistor R5 and the light-emitting diodes ELD7 and ELD8 connected in series between pins 24 and 9; the protection board detection circuit includes single-phase windings U2 and U3, three-phase windings U4 and U5, and are connected in parallel to the potentiometers at both ends of the windings U2 and U3. W3, W4, can connect the potentiometer W3 center head and one end switch K4 between 6,38 pins or 26,43 pins, and can connect the potentiometer W4 center head and one end between pin 42, 28 or 10,11 pins Switch K5, used to measure the potentiometer W3, W4 center head and three-phase winding U4, U5 AC voltage switch K6, K7, K8 and voltmeter V3, can connect the socket 38 or 22 pins respectively to the potentiometer W3-end of the button Switch AK3, resistor R6 and LEDs ELD9 and ELD connected between pins 14 and 32 of the socket and DC 15V, from The signal from pin 2 of the socket is sent to the sampling potentiometer W1 of pin 5; the rectifier plug-in detection circuit includes a potentiometer W2 connected to the pin 3 of the socket through a switch group, and the pin 33 of the socket is connected to 24, 45, 7, 15, and The resistor R2 and the light-emitting diodes ELD1, ELD2, ELD3, ELD4, ELD5, ELD6 are connected between the 30 and 22 pins.
http://www.songdaokeji.com/plus/list.php?tid=22
