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The specific maintenance steps of the high frequency machine:
1. When the power switch on the panel is opened, the voltmeter is not indicated, and the power lamp is not bright.
(1) the total power switch is not opened. Open the total power switch first.
The cooling fan is damaged. Replace the fan.
(3) the malfunction of the micro switch below the fan.
A, no adjustment of the wind blade, so that the fan can not be sucked by the fan or although it can be sucked up, but can not drive the micro switch. Re - adjust the leaf.
B, fretting switch is damaged. Change the fretting switch.
(4) the 10A or 3A safety pipe in the upper part of the machine is broken. After finding out the reasons for troubleshooting, it will be replaced with the same specification of the safety pipe.
Switch damage or circuit breakage. Change the switch or remove the circuit breakpoints.
2. Automatically, there is no action after turning the turntable.
(1) if the turntable can not be dropped when turning into a turntable, it indicates that the damage or position of the travel switch SQ1 can not be moved. Change the SQ1 or adjust the position.
After the turn of the turntable, there is no upper mode decline.
A, drop indicator light. Drop the electromagnetic field valve YV2 damage or circuit breakage, check the line or replace the solenoid valve YV2
B, the drop indicator is not bright. Travel switch SQ2 damage or position change and drop delay time KT1 damage, replacement or readjustment.
(3) without air pressure, connect the compressed air, adjust the pressure to 6-8Kg/cm2
3. No indication of ammeter during welding
(1) the gate resistance is broken. Repair the circuit breakpoints or change the resistance.
High voltage DC circuit fault.
The A and positive HVDC did not reach the anode of the electron tube. Repair the circuit breakpoints;
B, high voltage rectifier bridge is bad. Change;
C, high voltage transformer bad. Change;
D, the AC contactor is bad. Change;
E, weld time is broken. Change.
The electronic tube is not attached to the filament voltage (the line fault or the filament transformer bad). Remove the fault or replace the transformer.
(4) high pressure negative pole and open road (line fault or ammeter opening). Troubleshooting or replacing the ampere.
The cathode of the electronic tube (usually the filament) and the ground. Reconnect.
The tube damage. Change.
The AC contactor is damaged or broken line. Replace AC contactor or repair line.
The welding time KT2 damage. Replacement of weld time system.
4, the anode current automatically rises slowly after a few seconds when the high pressure is unloaded. The grid current is large, and the grid current is properly reduced.
5, the unloaded anode current is too large (normal value is about 0.15A), and the output of the resonant bucket is heated.

The capacity of the bucket capacitor is small, and the gap between the aluminum plate of the capacitor is adjusted to increase the capacity of the capacitor.

6. The anode current rises rapidly to the larger value when it is empty, and the machine appears protection action, and the protection indicator lights up.
(1) fire inside the resonant bucket. Remove dust or foreign objects.
2. The barrel side capacitor is fired. Clean the aluminum plate and repair the ablative place.
The connection of the resonant bucket and the casing is bad. Remove rust, tighten the screw connection.
(4) there is a touch connection between the conductive belt drawn from the resonant bucket and the capacitive aluminum plate on the side of the cavity or the bucket. Adjust the position of the conductive band.
The aluminum cover of the resonant bucket is not in contact with the cavity. Remove the polished with emery cloth back and tighten the screws.
The electron tube heater bypass capacitor circuit. Change.
The gate capacitance circuit breaker. Change.
The gate connect missed. Tighten the screws.
7. The anode current rises rapidly and the protection action occurs when the welding is connected, and the protection indicator lights up.
(1) mold fire. Find out the reason for exclusion (see 12).
The setting of the homology is too high. Bottom setting value.
8. The anode current rises slowly at the time of welding. The capacity of the bucket capacitor is large, and the gap between the aluminum plate is reduced so that the capacity of the capacitor is reduced.
9. The brightness of the tube is obviously weakened with the increase of the output power, and the AC contactor can not be firmly absorbed. The power supply voltage is too low or the power line is too thin.
10, the luminance of the electron tube is obviously lower than that of the original. Power line electronic lamp or poor contact tube aging, eliminate bad contact or replace the electronic tube.
11, welding AC contactor bounce can be closed, or pull in there will be obvious noise.
(1) the bridge type high voltage rectifier has one or two groups of breakdown short circuits. Change.
(2) high voltage direct current channel high voltage capacitor breakdown or line has connection with the casing. Replace high voltage capacitor or eliminate short circuit fault.
The high voltage transformer is short circuited. Change.
12. When melting, the mold often fires.
The mold has a burr or too dirty. A polishing or cleaning mold.
The die is not leveled. Adjust the mold.
(3) the damage of the insulating material of the lower mold or the mark of fire is not cleaned up. Replace the insulating material or clean the fire marks.
(4) the welding current is adjusted too much. Adjust the welding current.
The melt receiving too much water or impurities. The change is melting graft.
13, when the welding current is small, the overcurrent protection action occurs when the welding current is relatively small, or the current exceeds the maximum allowable value (5000S is 0.8A and 8000S is 1.2A), and the over current protection is not yet able to move. Over current protection adjustment resistance (30W10 omega) is not adjusted. Readjusting.
14. When the mold is fired, there is no spark protection action, or although there is a movement, the die burns more seriously.
(1) the sensitivity of spark protection is adjusted too low.  The clockwise rotating potentiometer on the circuit board to increase sensitivity.
The spark signal line is broken. Repair the circuit breakpoints.
(3) the fault of the spark circuit board. Change or repair.
Protect the relay from damage. Change.
15, at the beginning of the weld joint, the protection action appears.
(1) the sensitivity of spark protection is adjusted too high.  Moving counter clockwise on the circuit board to reduce the sensitivity of the potentiometer.
2. The heating body of the hanging die hot plate is leaking.  Replace the heating body.
The spark signal line is touched with the machine shell.  Check and exclude.
(4) the fault of the spark circuit board. Change or repair.
The welding current is set too much. Adjust the homology to reduce the setting value of the welding current.
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