Samlexpower SDC-60 User manual

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 con-
ductor 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

SPECIFICATIONS
CAUTION! : THERE IS NO ISOLATION BETWEEN THE INPUT AND THE OUTPUT.
INPUT AND OUTPUT HAVE A COMMON NEGATIVE
Input to output isolation Not isolated. Input and output connections have a common negative
Input voltage 20 to 35 VDC
Output voltage 13.8 VDC ± 0.1 V
Output voltage regulation Less than 3%
Input current at no load 50 mA
Output current
Continuous 60 A
Current limit * 70 A
*Note: In current limit condition, the output voltage will drop if the
current drawn increases beyond the current limit value of 70 A
Output ripple and noise less than 50 mV RMS
Efficiency Approx. 92%
Operating ambient temperature - -20 to +30
o
C (derate linearly to zero at 70º C)
Humidity Max. 95%, non condensing
Protections:
- Overload By current limiting
- Cooling Temperature controlled fans
- Over heating Drop in output voltage
- Reverse polarity Fuse protection
- Over voltage Varistor (also protects against load dump)
Input side fuses 60 A (2 pieces of 32V, 30A in parallel)
Safety and EMC Standards:
- Emission EN50081-1
- Immunity EN50082-1
- Automotive directive 95/45/EC
Input / output connections Terminal Block - M6 Bolt and Nut
Weight 2.6 lbs / 1.2 Kg
Dimensions (H x W x D) 3.5” x 3.6” x 7” / 90 x 93 x 177mm
Warranty 2 years
NOTE: Specifications are subject to change without notice
Samlex America Inc.
110-17 Fawcett Road
Coquitlam BC Canada V3K 6V2
Telephone: [phone]
SDC60-August2006