Introduction to the selection and precautions of LED switching power supply
1, The metal shell power cord is generally connected to the ground (FG) and must be reliably grounded to ensure safety. The shell should not be mistakenly connected to the neutral wire.
2, Before the installation is completed and the power on trial operation is carried out, please check and calibrate the wiring on each terminal again to ensure that the input and output, AC and DC, single-phase and multi-phase, positive and negative poles, voltage and current values are correct before powering on for operation.
3, For high-power LED switching power supplies, there are generally three or more "+" input terminals and "-" output terminals. In fact, they belong to the same output electrode, but for the convenience of user wiring, multiple terminals are connected together internally.
4, To achieve sufficient heat dissipation, it is generally necessary to install it in a location with good air convection conditions or on the chassis shell to transfer heat out through the shell.
5, Before leaving the factory, resistive loads should be added to the LED switching power supply. If capacitive or inductive loads are required, they should be specified in advance when ordering
6, For dual output symmetrical loads, the symmetrical output power supply is preferred
7, For users whose power supply FG is not grounded, it is normal to feel a tingling sensation when touching the casing or output. When floating, FG has an AC output of about 110V to the ground, which is determined by the internal structure of the power supply.
8, The definition of AC input power supply is input power=output power/(input voltage * power factor * efficiency)
9, Leakage current: When multiple power supplies are in use, they share the same grounding point, and the total leakage current is composed of the leakage current of each unit added together. At that time, it is necessary to check the reliability of the protective grounding wire and whether the grounding resistance meets the requirements to avoid electric shock.
