Commissioning technology of high-frequency induction heating equipment

Commissioning of high-frequency induction heating equipment

Normal must be normal before use.Check the inverter by following the following steps:

① only close the power supply of the control part (note: do not close the large air switch of the main circuit), press the cabinet door

Inverse start button (green button), adjust the power adjustment knob clockwise to the maximum position, and observe with the two-line oscilloscope whether the drive signal on the control pole of each IGBT module is normal (pulse is about 50% square wave, pulse width

The top is about + 15V, recess is about-8V.The ascending and descending lines are within 1 μS, with the bridge arm two up and down

The dead region of the IGBT gate pulses is greater than 2 Μs) and confirm that the IGBT drive signal of the same bridge arm is isophase (the upper and lower errors must not exceed 0.5 Μs) and the IGBT drive signal of the upper and lower bridge arms must be reversed.

Inspection of the ② rectification pulse.Press the start button, the three SCR gates should have a pulse with an amplitude greater than 1.8V, pulse width and a pulse frequency of about 10kHz.

③ pressure resistance test.Close the main circuit large air switch (do not close the control voltage switch).At this time, see the DC voltmeter pointer is slowly rising to more than 500V, observe whether the equipment is normal (no abnormal sound, no odor, and no device breakdown), keep to the right for 10 minutes, depending on the equipment is normal, the main power switch can be turned off.At this time the DC

The pressure automatically slowly drops down to zero.

④ high frequency induction heating equipment, follow the following steps to start the inverter.

Connect the cooling water and check whether each cooling water channel is normal.Adjust the counterclockwise of the power adjustment knob to the minimum position, close the pump switch, control power switch and main power switch, Note when the DC voltmeter rises to nearly 500V with charging.Press the start button to delay 2 seconds in the right inverter.Each table shall have corresponding instructions, gradually increase the power adjustment knob clockwise, and the DC current and power meter instructions shall increase immediately and reach the given value.The device is now in normal operation.The personnel dispatched by the equipment manufacturer to adjust each protection setting value to the required value (the equipment has been basically adjusted before leaving the factory, and can be appropriately adjusted according to the site).

Description of the ⑤ motherboard potentiometer

P1—— tunes the intermediate current waveform hook close to the sine wave and leaves about 200 angles.

P2—— adjusts the intermediate frequency current intercept value size.

P3—— FM current intercept value size.

P8—— adjusts the intermediate frequency current protection value size.

P9—— FM current protection value size.

P10—— Frequency Table calibration.

⑥ Shudown in the following steps.

First adjust the power adjustment knob counterclockwise to the minimum position, press the reverse stop button, and stop the medium frequency sound immediately.Turn off the main power switch, observe the DC voltage meter drop to zero, then turn off the control power supply switch and water pump

Switch.

Description of the main control panel signal indicator lamp of the ⑦ high-frequency induction heating equipment:

Description of the ⑧ external protection panel signal indicator lamp:

⑨ warning: After the main power switch is closed or reversed, it is forbidden to test any part with an oscilloscope or a table, otherwise the failure will occur due to the access of the parameters outside the test end of the instrument.