Relay is a kind of electrical appliance that turns on or off the control circuit according to the change of external input signals, such as electrical voltage, current) or non-electrical quantity (heat, time, speed, etc.) to complete the control or maintenance mission.
1. Overhaul of sensing tissues
In the case of electromagnetic (voltage, current, intermediate) relays, the sensing structure is the electromagnetic system. The problems of the electromagnetic system are mainly concentrated in the coil and the moving and static iron cores
(1) Coil fault maintenance coil is usually damaged by coil insulation: mechanical injury to form four short circuits or grounding, because the power supply voltage is too low, the dynamic and static iron core touch is not tight, so that the current through the coil is too large, the coil is heated and burned. its repairs
The coil should be rewound. If the street iron does not engage after the coil is energized, it may be that the connection of the coil lead wire falls off, causing the coil to break off. Weld after checking out the falling out
(2) Iron core faults: The main problem of iron core maintenance is that the armature cannot be sucked after the power is on. This may be due to broken coils, foreign matter between the moving and static cores, and low power supply voltage. After the power is turned on, the armature is noisy, which may be due to the uneven touch surface of the moving and static iron cores, or the formation of oil pollution. When repairing, the coil should be removed, and the contact surface should be smoothed or smoothed If there is oil stain, it should be cleaned, and the noise is likely to be caused by short circuit and ring breakage, so it is enough to repair or replace a new short circuit ring. After the power failure, the armature can not be released immediately, which may be because the moving core is stuck, the size of the iron core gas hospital, the elastic tube strain and the iron core touch surface has oil stains, etc., the maintenance should be treated differently for the reason, or the gas hospital to make it maintenance at 0.02-0.05MM, or replace, or clean the oil with gasoline, about the thermal relay, its sensing organization is the thermal element, and its common reason is that the thermal element is burned out, or the thermal element malfunction and non-operation.
(1) Burning out of the thermal element. This may be due to a short circuit on the load side, or a heat element that operates too frequently. During maintenance, the heating element should be replaced, and the setting value should be readjusted, and 2) the thermal element malfunctioned. This may be due to the size of the setting value, the action without overload, or the strong impact and vibration in the application situation, which causes the action tissue to loosen and trip, resulting in malfunction and the formation of 3) thermal element does not operate. This may be caused by the setting value being too small, which makes the thermal element lose its overload maintenance function. During maintenance, the setting current should be adjusted according to the load operating current
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