The pin of AC line （L）, ac neutral （N）,the third wire safety ground （FG） should be retained from the AC power outlet to the power supply input terminals without accidental interchange. （Figure 1.1）
（Figure 1.1）
The FG pin should be connected to the equipment where power supply is placed as thickershorter to protect electric shock or noise interference. （Figure 1.2）
（Figure 1.2）
Fuse :
To add a fuse at the input terminals of the power supply to provide safetyprotection. We suggest using a 1. slow blow fuse for our AC-DC Converters including AHC, APC, ATC, ANCASC series. （Figure 2.1）
（Figure 2.1）
Seriesparallel operation :
I. Series operation Most power converters can be operated in series if they have overload limitation by either constant current or constant power circuits. To protect each output from the reverse voltage applied by the other unit in the event of load short circuits, reverse biased diodes are used as shown in Figure 3.1
（Figure 3.1）
II. Parallel operation This is only recommended with power converters specifically designed for parallel connection. In the parallel redundant scheme illustrated in Figure 3.2 one of the power converters could be replaced by a battery followed by a DC-DC converter to provide a no-break power system in the event of main supply failure.
（Figure 3.2）
Reduce the output ripplenoise :
Please be aware the length of screw should not be longer than 3 mm while you mounting/ adopting our power supply on your end application, in case screw break through Mylar or PCB Board result in short circuit.
（Figure 4.1）
Screws for Switching Power Supply （AQS & AQF Series） :
Please be aware the length of screw should not be longer than 3 mm while you mounting/ adopting our power supply on your end application, in case screw break through Mylar or PCB Board result in short circuit.
DC-DC Application Note
Connection for standard use :
Cin: External capacitor on the input side Co: External capacitor on the output side
Reverse input voltage protection :
Avoid the reverse input voltage because it will damage the power supply. Installing an external diode can protect the converter from the reverse input voltage.
Seriesparallel operation :
I. Series operation Most power converters can be operated in series if they have overload limitation by either constant current or constant power circuits. To protect each output from the reverse voltage applied by the other unit in the event of load short circuits, reverse biased diodes are used as shown in Figure 3.1
（Figure 3.1）
II. Parallel operation This is only recommended with power converters specifically designed for parallel connection. In the parallel redundant scheme illustrated in Figure 3.2 one of the power converters could be replaced by a battery followed by a DC-DC converter to provide a no-break power system in the event of main supply failure.
（Figure 3.2）
Remote On/ Off Control Pin :
Positive logic remote on/ off turns the module on during a logic high voltage on the remote on/ off pin,off during a logic voltage low. In order to turn module on or off, the use must supply a switch to control the voltage between the on / off terminalthe –Vin terminal.
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（Figure 4.1）
DC-DC Application Note: 
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