The existence of a variable frequency air conditioner can be said to be a significant improvement in our daily life, so once a variable frequency air conditioner creates a product failure caused by damage or some of the wrong methods of operation, it inevitably causes some trouble in the lives of its users and may even result in some avoidable loss of property. It is therefore necessary for us to learn about prevention and to deal with knowledge. What i'm presenting to you today is knowledge of the maintenance of the fm ac circuit boards。
I. Vac circuit board maintenance techniques
The breakdown can be determined by detecting the normalness of the heat and external resistance, pressure relays, heat protections, sequence protections. If the protective component is normal, it indicates that the failure is on the main circuit; if not, it means that the failure is on the protecting circuit。
A replacement method is used to distinguish between failure points, such as the replacement of the old master plate with the new master plate, which eliminates the failure, which means that the failure is on the main circuit; and, if the failure is still after replacement, which means that the failure is protecting the circuit。
Ii. Presentation of the case of the maintenance of the circuit boards of the fm ac
(1) outdoor power supply main relay failure causing p1 voltage or low protection in whole units
Fragmentation: new set-up, start-up, frequent high p1 voltage or low protection
Fragmentation range: outdoor electrical control, pfc module, frequency module
Step 1: the failure code determines that p1 is shown to be over-voltage or under-protected. The user power voltage is measured at 225 v, which meets the operational requirements of the fac。
Step two: using a universal meter, the outer room machine l, n has 225 v voltage output on the main panel. When measuring the p-n direct flow 300v input end, the straight-flow parent voltage is unstable, the monitoring module p, n voltage is slowly reduced from 300 v, and when reduced to less than 113 v, the complete p1 voltage is over- or under-protected and the final module p, n voltage is zero v. A few minutes later, modules p and n received another 300 v current input voltage。
Step three: based on this phenomenon, the failure point was initially determined to be the main source of electrical supply outside the house, the main electrical relay outside the room was found to be non-sorted after further testing, the input end was entered with 220 v, the output end was no 220 v, and the adjacent ptc heat-sensitive electrical resistance was severe, measuring the circuit block value of the relay was inexhaustible, opening the circuit. The end-end attached to the main relay is attached to the other end, the machine is stable and irritated, and when the end of the relay is restored to a properly installed state test, the failure is repeated, so the failure point is determined to be the poor main relay on the outer panel. Measures:
Replacement of outdoor circuit boards and normal electrical operation of air conditioners。
With regard to the maintenance of transformer air-conditioning circuit boards, we presented information on two blocks, including techniques and actual cases, which allows us to learn that proper knowledge can help us avoid unnecessary troubles and losses, while also saving the cost of manual maintenance. Of course, given that users do not have the relevant professional basic knowledge, we should turn to maintenance and processing staff when necessary to solve problems more quickly。
