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What is the reason why the vacuum packaging machine does not vacuum?

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The relays are off.

common faults and solutions of vacuum packaging machine
1 Low vacuum: the pump oil is polluted, too little or too thin. Clean the vacuum pump and replace it with a new vacuum pump oil; The extraction time is too short to prolong the extraction time; The exhaust filter is blocked, clean or replace the exhaust filter; If there is air leakage, turn off the power supply after evacuation, and check whether there is air leakage in the solenoid valve, pipe connector, vacuum pump suction valve and the sealing gasket around the working chamber
2. High noise: the vacuum pump coupling is worn or broken and replaced; If the exhaust filter is blocked or the installation position is incorrect, clean or replace the exhaust filter and install it correctly; Check whether there is air leakage in the solenoid valve and eliminate it
3. Oil injection of vacuum pump: the O-ring of suction valve falls off, pull out the vacuum pipe on the pump nozzle, remove the suction nozzle, take out the compression spring and suction valve, gently stretch the O-ring several times, re insert it into the groove, and then install it; If the rotary vane is worn, replace the rotary vane
4. Oil leakage of vacuum pump: the oil return valve is blocked, remove the oil return valve and clean it (see the manual for details); After the oil window is loose and drained, remove the oil window and wrap it with raw material tape or thin plastic film
5. Large oil fume of vacuum pump: the exhaust filter is blocked or polluted, and the exhaust filter shall be cleaned or replaced; The pump oil is polluted and replaced with new oil; The oil return valve is blocked. Clean the oil return valve (see the manual for details)
6 No heating: replace the heating strip when the heating strip is burnt out; The heating time relay is burnt out (the two lights are on at the same time when starting up, and the color of OMRON light is yellow), replace the time relay; Replace the heating wire when the heating wire is burnt out and install it firmly; The control heating temperature band switch has poor contact, repair or replace it; The AC contactor controlling heating does not reset, repair (blow away foreign matters with air flow) or replace; Replace the damaged heating transformer
7 Heating does not stop: the heating time relay has poor contact or burns out, adjust the contact between the time relay and the socket or replace it; Control heating AC contactor does not reset, repair or replace
8 The sealing is uneven, not tight or the steel box is not sealed, and the deformation of the steel box is adjusted; The heating time and temperature are not adjusted properly; There are attachments on the heating cloth. Gently scrape the attachments with your fingernails; If the pressurizing solenoid valve does not operate, clean or replace the solenoid valve; Replace the airbag if the airbag is damaged; Repair or replace the damaged pressurized air pipe; If the cooling time relay without air bleeding is broken (in the electrical box), replace the time relay; Check and connect the open circuit of the vent valve circuit; The bleeder valve sticks or burns out. Remove it for cleaning or replacement
9 While heating, do not heat, do not heat, the packing bag pressing strip is short circuited with the heating device (generally short circuited with the brazing strip), adjust the position of the brazing strip, or rest the packing bag pressing strip
10 Pump rotation without vacuum pumping: the working chamber is not tightly covered; Reverse the motor (pay attention not to change the ground wire, and the color wire is the ground wire); Fuse break (indicator light on) replace fuse with the same specification
11 Cover closing does not work: no power supply, check whether there is power supply; If the travel switch does not act, adjust the travel switch paddle; The fuse is broken (the indicator light is on) replace the fuse of the same specification
frequently burn the fuse, find and eliminate the short circuit; If the motor reversing time is too long, any two-phase power lines shall be replaced and installed (except the ground wire); If the oil viscosity is too high, wash the pump and change the oil
repair the short circuit of the paddle in the fuse box

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