Samlex America SDC-60 User Manual
DC-DC Step
Down Converter
Owner's
Manual
Please read this
manual before
operating your
converter
Model:
SDC-60
INSTRUCTION MANUAL
24 VDC TO 12VDC CONVERTER - MODEL NO. SDC-60 ITEM NO. 06750
SDC-60 is a 24 VDC (nominal) to 12 VDC (nominal) converter based on a high performance fixed frequency power switching regulator. It is
designed to deliver a maximum current of 60 A at an output voltage of 13.8 VDC
Features:
•
High efficiency switching regulator
•
Small size and light weight
•
Cycle by cycle current limiting
•
Over voltage , short circuit and reverse polarity protections
•
2 temperature controlled fans for cooling
INSTALLATION AND OPERATION
General installation requirements
- Install the unit in a cool, dry, protected and well ventilated space
- The unit may be installed on top of a horizontal surface or on the bottom of a horizontal surface. The unit can be installed horizontally on a
vertical surface (fan should not be pointing up or down)
- The unit has a temperature controlled fans for cooling. The suction and discharge openings on the sides should not be blocked. The fans will
only come on if the unit gets hot.
Input and output connections
The unit has a terminal block with (3) M-6 bolt & nut connections - one for positive 24 VDC input (marked INPUT), one for common negative
for input and output (marked MINUS) and one for positive 13.8 VDC output (marked OUTPUT).
CAUTION ! Please ensure that the polarity of the input connection is not reversed. Always connect the positive of the 24 V battery to
the positive terminal marked INPUT and the negative terminal to common negative terminals marked MINUS. A reverse polarity
connection will blow the fuses inside the unit
Sizing of input and output conductors. Conductors have resistance that opposes the current flow and produces voltage drop and heating. The
resistance is directly proportional to the length of the conductor and is inversely proportional to the thickness (area of cross-section). Thus, a
longer and thinner conductor will have higher resistance and will, therefore, produce higher voltage drop and more heating. The size of a conductor for a particular application will depend upon the maximum current it is required to carry and for what distance. The size of a conductor
is designated by AWG (American Wire Gauge) number. The smaller the AWG number, the thicker the conductor. The conductors should
be sized for a maximum voltage drop of 2%. The cables should be multi-stranded insulated copper cable rated for at least 90 º C and
preferably oil resistant. The cables can be bought at a welding / marine supply store.
Cables for 24 VDC input and 12 VDC output connections. The cables on the input and output sides should be able to carry a maximum
current of approximately 60 A. To limit the voltage drop to 2%, use # 4 AWG for distance up to 6 ft. and # 2 AWG for up to 10 ft.
Use ring type of terminals for M-6 bolt on the ends of the cables to enable connection to the M-6 bolts of the terminal block.
External fuses on the input and output sides: The input and output connections should be made through 32 V, 60A fast blow fuses (For
example “2 pieces of Bussmann” Type ATC-30 or ATM-30 automotive type fuses in parallel or 1 pieces of Type MAX-60). The fuses should
be connected in series with the positive input and output cables. The fuse on the 24 V input side should be as close to the battery positive
terminal as possible. This will prevent the possibility of overheating / melting of the input side cables in case of short circuit on the input side
cabling (A battery can provide very large currents during short circuit condition)
WARNING: The warranty will be voided if the above external fuses are not used
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