Samlexpower SDC-20 Manuel utilisateur
OWNER’S MANUAL
Non Isolated DC TO DC Converter SDC-20
(For use in hazardous locations - Class 1, Div. 2, Gp. C & D, T6)
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1
2345678901234567890123456
7
1
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7
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IN
+24V
+
IN
GND
-
OUT
GND
-
OUT
+13.8V
+
BATTERY+24VDCNOMINAL
BATTERYGROUND
LOAD +12VDC NOMINAL(13.8V)
LOADGROUND
WARNINGS!
DESCRIPTION
SDC- 20 is a non isolated DC to DC converter that converts 24 VDC nominal voltage (range 20
VDC to 35 VDC) to 12 VDC nominal voltage (13.8 VDC). The input and output sides have a com-
mon negative ground. Hence, there is no isolation between the input and the output sides. Both
the input and output sides are isolated from the chassis of the unit.
The unit is designed to be operated in hazardous envirionment - Class 1, Div 2, Gp. C& D, T6
PROTECTIONS
Overload / Short Circuit: The unit is protected against overload by current limiting. When the
output current reaches the current limit value (please see the specs), the output voltage will drop
and will no longer be regulated. The unit will reset automatically once the overload condition is
removed.
Temperature Compensated Current Limit: As the temperature of the main switching MOSFET
increases, the value of the current limit decreases.
Over Voltage on the Output Side: If the output voltage increases beyond 16.5 V +/-0.5 V, a crowbar
circuit will activate and blow the input side fuse.
Over Voltage / Transients on the Input Side: The input side is protected against over voltage and
transients through a Transient Voltage Suppressor. In case the input voltage exceeds 37 VDC, the
internal fuse will blow.
Reversal of Polarity on the Input Side: In case the input side polarity is reversed, the external input
side fuse will blow.
-This unit is not a battery charger! Hence, do not connect this unit directly to a
battery for battery charging purposes
- This unit is designed to be used on negative grounded systems only. Do not
connect the input / output sides to a positive grounded system
- The input and output sides have a common negative ground. Hence, there is no
isolation between the input and the output sides
INPUTVOLTAGE..............................................................................................................................................20-30 VDC.......................
OUTPUTVOLTAGE.............................................................................................................................13.8VDC +/-0.1V@15A..........
CONTINUOUSOUTPUTCURRENT...................................................................................................................15A................................
PEAK OUTPUT CURRENT....................................................................................................................................20A..............
CURRENT LIMIT..............................................................................................................................................21+/-0.5A.......
NOLOADCURRENTDRAW.............................................................................................................................<150mA.........................
LOADREGULATION................................................................................................................................0.15V,26V,0-15A........
EFFICIENCY(Atmaximumoutput)..................................................... ...................................................................>88%..........................
RIPPLE.........................................................................................................................................................<50mVP-P@15A.................
NOISE..........................................................................................................................................................<120mVP-P@15A................
OPERATINGTEMPERATURERANGE....................................................................................................0-40OC.......................
EXTERNALINPUTFUSE(Atthebattery end)..................................................................................................32V, 15A......................
EXTERNALOUTPUTFUSE.................................................................................................................................32V, 15A.......................
INPUTWIRESIZE..................................................................................................................................................#10AWG......................
OUTPUTWIRESIZE...............................................................................................................................................#8AWG.......................
Hazardouslocationclassification............................................................................................................Class1, Div2,Gp. C& D,T6....
DIMENSIONS(width/depth/height).........................................................................................................7.8”x6.5”x 2.4”...........................
WEIGHT.............................................................................................. .................................................................... 3.5lbs...........................
*In accordancewithCanadian ElectricalCode, PartI
SPECIFICATIONS : SDC-20
For detailed schematics and testing procedures send your request via fax to (604) 525-5221 or e-mail at
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.
VersionSDC-20_Feb2008
INSTALLATION & OPERATION
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 40OC
-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
NOTE: Specifications are subject to change without notice.
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