SWITCHING MODE POWER SUPPLY
Contents
1. TENMA 15 AMP SWITCH MODE POWER SUPPLY Model 72 8110 USER MANUAL 1 INTRODUCTION This fixed voltage switch mode power supply is designed with high RFI stability and is especially suitable for two way radio and communications equipment The concealed trimmer allows user fine tuning adjustment from 13 3 14 5VDC Constant current circuitry is used for overload short circuit and over temperature protection Output current and voltage drop to a safe level when any fault occurs This power supply also has Over Voltage Protection to prevent connected equipment from damage 2 PRECAUTIONS Never use this power supply for high inductive load such as solenoid or motorized equipment The inductive kick back from the device may damage the power supply Never operate power supply immediately with a newly replaced fuse before the fault has been found and rectified Make sure to use the same rating and type as the original fuse Never remove the case when the supply is connected to AC or load Never touch the unit when your hands are wet Unit must be connected to a properly grounded three prong AC outlet Refer servicing only to qualified service personnel as incorrect re assembly may result in a risk of electric shock or fire Power supply output provides 13 8VDC fixed output be certain connected load accepts this voltage Never use the power supply for the load requiring higher current than the designed value at the risk of damage to the su2. pply Place the power supply on a flat surface with sufficient clearance dry dust free surroundings for ventilation Do not expose the power supply to sun high humidity or dust levels 3 CONTROL AND INDICATORS DC POWER OUTLET OVERLOAD O j f me f ee m f j f L d 2 ai w f j q 1 3 f N jj oA Fe N F f cet i ss f f 1 On Off switch with light 4 DC output binding post 2 Indicator Green Operate Red 5 Cooling fan variable speed Overload 6 AC power input IEC connector 3 Cigarette lighter socket 10A max 7 Fuse holder 4 OPERATION Switch on the power supply confirm that the LED indicator is green Switch off the power supply Confirm that equipment to be connected 13 8VDC Connect the positive input of the equipment to the Red output terminal of the power supply Then connect the negative input of the equipment to the Black output terminal of the power supply Switch on the power supply confirm that the LED indicator is green Switch on the connected equipment and the LED Indicator should still remain in green You can now operate the equipment When operation is finished switch off the equipment first and then switch off the power supply 5 FINE TUNING THE OUTPUT VOLTAGE This regulated power supply has been factory preset at a stable DC output Under normal operation there should be no need for fu
3. rther adjustment Buttom View O OUTPUT VOLTAGE ADJUST However should the need exist for specific output voltage other than the preset value refer to the following procedure 1 Let the power supply warm up for about 15 min 2 Turn the power supply over with the bottom up and connect a digital multi meter to the main output terminals 4 3 Locate the fine tune access hole 8 on the bottom as shown in Fig 1 4 Insert a slim flat head screw driver to get to the trimmer as shown in Fig 1 5 Carefully and slowly turn the screw driver clockwise or counter clockwise to the desired voltage setting 6 After returning the supply to its normal operating position measure output voltage again 6 SPECIFICATIONS Fixed Output Voltage 13 8VDC Continuous Output Current 15A Duty Cycle Output Current 50 on off 18A Ripple and Noise 50mVp p Load Regulation 100mV Line Regulation 50mV Input Voltage 110VAC 60Hz Cooling Method Variable Speed Fan Dimensions 2 5 H x 7 1 W x 7 5 D Weight 3 7 Ibs Tenma Test Equipment www tenma com
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