Common problems and repairs of 5v relay products in home appliances

5v relay products Due to the low power supply voltage, the contact between the moving and static iron cores is not tight, so that the current through the coil is too large, and the coil heats up and burns. When repairing, the coil should be rewinded. If the armature does not pull in after the coil is energized, it may be that the connection of the coil lead wire falls off, causing the coil to break. After checking out the drop-off, just solder it on.

5v relay products Iron core fault inspection and repair Iron core faults mainly include the armature cannot be sucked up after power-on. This may be caused by broken coils, foreign objects between the moving and static iron cores, and low power supply voltage. It should be repaired differently. After power on, the armature is noisy. This may be caused by uneven contact surfaces of the moving and static iron cores, or oil contamination. When repairing, the coil should be removed, and its contact surface should be filed or ground; if there is oil stains, it should be cleaned. The high noise may be caused by short circuit or ring breakage, just repair or replace with a new short circuit ring. After the power is off, the armature cannot be released immediately. This may be caused by the moving iron core being stuck, the iron core air gap is too small, the spring is strained, and the iron core contact surface is oily. When overhauling, you should treat it differently according to the cause of the fault, or adjust the air gap to protect it at 0.02～0.05mm, or replace the spring, or clean the oil with gasoline. For thermal relays, the sensing mechanism is a thermal element. The common fault is that the heating element burns out, or the heating element malfunctions and does not operate.

(1) The thermal element of 5v relay products is burned out. This may be caused by a short circuit on the load side, or the operating frequency of the thermal element is too high. During maintenance, the thermal element should be replaced and the setting value should be readjusted.

(2) 5v relay products thermal element malfunctions. This may be caused by the fact that the setting value is too small, the action is not overloaded, or there is strong shock and vibration in the use occasion, which causes the action mechanism to loosen and trip and cause malfunction.

(3) The thermal element of 5v relay products does not operate. This may be due to the fact that the setting value is too small and the thermal element loses its overload protection function. During maintenance, the setting current should be adjusted according to the working current of the load.