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General Installation Requirements
-This unit is cooled by convection. Install the unit in a cool, dry & well ventilated space. The ambient temperature should not
exceed 40
O
C
-Do not install the unit inside the engine compartment
-Do not connect / disconnect input and output connections when live voltages are present
Fusing on the Input & Output Sides
The input side of the unit will be connected to the battery. A battery has the capacity to supply very large currents. In case
there is a short circuit between the input side wiring, very heavy current will flow and will burn / melt the wiring and may be a fire
hazard. To prevent this, use a 32V, 15A fast blow fuse in line with the positive input wire within 18 in from the battery positive
terminal.
The output side should be connected through a suitable fuse in line with the "output + 13.8" terminal. Details of input/output side
fuses are shown in "Specifications"
WARNING! The warranty will be voided if proper fuse is not used as recommended
Switching on and Switching off Arrangement on the Input Side
There is no on / off switch on the input side of the unit. An external on / off switch may be used in series with the positive input
wire, if required.
Sizing of Input and Output Wiring
In order to prevent excessive voltage drop and consequent loss of current capacity and efficiency, use proper size of input and
output wires. Please note that as the current / length of wiring are increased, the thickness of the wiring will also be required to
be increased. The thickness of wires and cables is normally expressed in AWG (American Wire Gauge). Also, note that a lower
AWG number denotes a thicker wire. Use multi-stranded copper insulated wiring rated for at least 90 C. Please refer to details
of input/output wire sizes under "Specifications"
Making Input & Output Connections & Operation
CAUTION! Please ensure that the polarity of the input connection is not reversed. Connect the positive of the battery to
the positive terminal and the negative of the battery to the negative. In case the input polarity is reversed, the unit will be
damaged and will not be covered under warranty.
-Input and output connections should not be made when live voltages are present
-Switch off the load that is required to be powered from the converter
-Connect the output wires to the load and then to the output side of the unit through the external fuse. Observe correct polarity
-Switch off the external inline input side switch (if used) and also remove the external inline fuse in the positive input wire.
-Connect the input side wires to the converter's input side first. OBSERVE CORRECT POLARITY
-Connect the input wires to the battery
-Insert the external inline input side fuse in the positive input wire. NOTE: If an on / off switch is not used in series with the
positive input wire or if a switch has been used and has not been switched off, a spark may be observed when inserting the
fuse due to the initial inrush current to charge the input side capacitors inside the converter
-Switch on the input power to the unit (if an external switch has been used). Output voltage will now be available on the output
side of the unit
-Switch on the load
SPECIFICATIONS :
INPUT VOLTAGE.............................................................................................................................................. 20-30 VDC.......................
OUTPUT VOLTAGE............................................................................................................................. 13.8 VDC +/- 0.1V @ 15A..........
CONTINUOUS OUTPUT CURRENT...................................................................................................................15A................................
PEAK OUTPUT CURRENT....................................................................................................................................20A..............
CURRENT LIMIT.............................................................................................................................................. 21 +/- 0.5A.......
NO LOAD CURRENT DRAW............................................................................................................................. <150mA.........................
LOAD REGULATION................................................................................................................................ 0.15V, 26V, 0-15A........
EFFICIENCY (At maximum output)..................................................... ................................................................... >88%..........................
RIPPLE......................................................................................................................................................... <50mV P-P @15A.................
NOISE.......................................................................................................................................................... <120mV P-P @15A................
OPERATING TEMPERATURE RANGE....................................................................................................0 - 40
EXTERNAL INPUT FUSE (At the battery end) ................................. ................................................................. 32V, 15A......................
EXTERNAL OUTPUT FUSE................................................................................................................................. 32V, 15A.......................
INPUT WIRE SIZE.................................................................................................................................................. # 10 AWG......................
OUTPUT WIRE SIZE............................................................................................................................................... # 8 AWG.......................
Hazardous location classification............................................................................................................Class 1, Div 2, Gp. C & D, T6....
DIMENSIONS (width/depth/height).........................................................................................................7.8" x 6.5" x 2.4"...........................
WEIGHT.............................................................................................. .................................................................... 3.5 lbs...........................
* In accordance with Canadian Electrical Code, Part I
NOTE: Specifications are subject to change without notice.
For detailed schematics and testing procedures send your request via fax to (604) 525-5221 or e-mail at
samlex@samlexamerica.com
Samlex DC-DC Converters are covered by a 2 year limited warranty. Contact Samlex or your dealer for additional information.
Please retain your original bill of sale, it must be submited when making any warranty claim.
Version SDC-20_Feb2008
INSTALLATION & OPERATION
SDC-20
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C.......................
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