What are the common safety problems of school classroom lighting LED lamps?
The daily school classroom lighting LED lamps we use are related to safety in terms of structure, internal wiring, protection against electric shock, insulation resistance and electrical strength, creepage distance and electrical clearance, heat resistance and fire resistance. Different light sources and materials used in LED lamps for classroom lighting in different schools determine different prices and safety performance. LED lamps have built-in power and external power, and different institutions determine different safety methods.
For Class II anti-shock type, it is required that the LED lamps used for school classroom lighting input contactable parts to enhance insulation resistance and electric strength. Many built-in power transformers and LED module aluminum substrates are improperly installed, resulting in failure of the test. Or many companies directly use non-isolated power supplies in order to save costs and improve power efficiency. It is necessary to avoid the direct contact of the internal wires and the power supply with the housing to prevent the wires from being broken. In terms of structure, it is also necessary to prevent the insulation of lamp caps, screws, and accessible metal surfaces, and the corresponding lamp cap plastics must be of good quality to prevent melting.
Since the screw of the LED lamp directly locks the lamp housing, it is required to pay attention to the creepage distance and electrical spacing. The internal power supply and the aluminum casing should be separated by an insulating sleeve to achieve an electric resistance level. The lamp head and lamp body should be absolutely insulated to prevent leakage of the casing.
In view of the current low-end school classroom lighting LED lamps in the market, there are often problems. The editor of Pinwan Technology summarizes several common faults and maintenance methods for school classroom lighting LED lamps, and provides reference for everyone.
The failure of the LED light-emitting module, phenomenon: all LEDs flicker. Problem: Poor contact, Solution: Re-fix and plug the loose parts.
Phenomenon: The LED light is dim. Problem: The LED polarity is reversed. Or the LED chip is too old, or the switching power supply and LED voltage labels are inconsistent. Solution: Make sure that the positive and negative poles are connected correctly, reduce the LED connection, and ensure that the power supply and LED voltage labels are the same.
Phenomenon: The LED lights of some lines do not light up. Question: Is the connection direction normal, whether the power cable is connected correctly, and the power cable is reversed and reversed. Solution: Take out the led lamp bead and re-direct it in the correct direction, make sure that the red wire is connected to the positive pole and the black wire is connected to the negative pole, find the reversed line, and reconnect it correctly.
Phenomenon: All LED lamp beads are not bright. Question: The switching power supply has no voltage output. Is the output wiring of the switching power supply correct? Solution: Test the power connection to the input terminal of the switching power supply, and check whether the positive and negative poles of the power cord are correct.
