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    Electric furnace technical information
        

    High-frequency induction heating equipment debugging technology

    Debugging of high frequency induction heating equipment

    It must be debugged normally before use. Follow the steps below to check the inverter:

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

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

    The top is about +15V and the rest is about -8V Rising and falling edges . 1 [mu] or less, the two bridge arm

    The dead zone of the IGBT gate pulse is greater than Μ ), and confirm that the IGBT drive signals of the same bridge arm are in phase (the error of the upper and lower edges cannot exceed 0.5 Μ ), and the IGBT drive signals of the upper and lower arms Must be in reverse.

     

    2 check of the rectification pulse. Press the start button, the gates of the three SCRs should have a column of pulses with amplitude greater than 1.8V, pulse width 50%, and pulse frequency of approximately 10kHz .

    3 pressure test. Large air switch with main circuit (do not control voltage switch). At this point, the pointer of the DC voltmeter should be raised to 500V or more. Observe whether the equipment is normal (no abnormal sound, no odor, no breakdown of each device), keep it for 10 minutes, and turn off the main power switch. At this time, DC

    The pressure automatically drops to zero.

     

    4 High-frequency induction heating equipment Follow the steps below to start the inverter.

    Pass the cooling water and check if the cooling water passages are normal. Turn the power adjustment knob counterclockwise to the minimum position, and then combine the water pump switch, the control power switch, and the main power switch. Note that the DC voltage meter can rise to nearly 500V with the charge Press the start button, delay seconds to start in the right inverter. The relevant tables should have corresponding instructions. Gradually increase the power adjustment knob clockwise, and the DC current and power meter indications will immediately increase and reach the given value. At this point the device has entered normal operation. The equipment manufacturer sends personnel to adjust the protection settings to the required values (the equipment has been basically adjusted before leaving the factory, and can be adjusted as needed on site).

     

    5 main control board potentiometer description

    P1 - Adjust the intermediate frequency current waveform head to make it close to the sine wave and leave about 200 angles.

    P2 - Adjust the mid-frequency current cutoff value.

    P3 - Adjust the frequency of the current frequency current.

    P8 - Adjust the value of the intermediate frequency current protection value.

    P9 - Adjust the frequency of current protection.

    P10 - Frequency meter calibration.

     

    6 Stop as described below.

    First turn the power adjustment knob counterclockwise to the minimum position, press the inverter stop button, and the medium frequency sound stops immediately. Turn off the main power switch, then observe the DC voltmeter drops to zero, then finally turn off the control power switch, water pump

    switch.

     

    7 high frequency induction heating equipment main control board signal indicator description:

    name

    effect

    name

    effect

    L3

    Input power indication

    L4

    Input power indication

    L5

    +15V power indicator

    L6

    -15V power indicator

    L7

    +5V power indicator

    L8

    Grid protection indication

    L9

    Water temperature water pressure power supply indication

    L10

    Inverter pulse work instruction

    L11

    Inverter pulse work instruction

    L12

    Rectified pulse working instruction

    L13

    Module protection indication

    L1

    IF overcurrent protection indication

    L2

    Power frequency overcurrent protection indication

     

     

     

    8 External protection board signal indicator description:

    name

    effect

    name

    effect

    ILED1

    Input power indication

    ILED2

    External circulation water pressure protection indication

    ILED3

    External circulation water pressure protection indication

    ILED4

    Grid undervoltage protection indication

    ILED5

    Grid overvoltage protection indication

    ILED6

    Internal circulation water pressure protection indication

    ILED7

    Internal circulation water pressure protection indication

    ILED8

    Internal circulation water temperature protection indication

    ILED9

    Cabinet internal environmental temperature protection indication

     

     

     

    9 Warning: After the main power switch is turned on and the inverter is started, it is forbidden to test any part with an oscilloscope or with a meter. Otherwise, the fault will be caused by the access of the parameters outside the test end of the instrument.


     


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    Tel:18037961302 Sales hot line ( 24 hours service): 18037961302
    E-Mail:firstfurnace@gmail.com
    Adress: Luoxin Industrial Park, Luoyang, Henan