3
2
-
Remove the external input side fuse F1 (Fig 4.1) 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 input side fuse F1 (Fig 4.1) in the Positive input wire. NOTE: A spark may be observed
when inserting the fuse due to the initial inrush current to charge the input side capacitors inside the
converter.
-
Output voltage will now be available on the output side of the unit.
-
Switch on the load.
5. SPECIFICATIONS
3.2 Temperature Compensated Current Limit
As the temperature of the main switching MOSFET increases, the value of the current limit decreases.
3.3 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 internal input
side fuse (5, Fig 1.1) / external input side fuse F1 (Fig 4.1) will blow.
3.4 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 input side fuse (5, Fig 1.1) / external input side fuse F1 (Fig 4.1)
will blow.
3.5 Reversal of Polarity on the Input Side
In case the input side polarity is reversed, the internal input side fuse (5, Fig 1.1) / external input side fuse F1
F1 (Fig 4.1) will blow.
4 INSTALLATION & OPERATION
4.1 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
4.2 Installation Diagram
Installation information is given at Fig 4.1 below:
Fig 4.1 Installation Diagram
CAUTION
!
Fuse F1 to be
within 7” from the
Positive terminal
24V IN
GND
GND
13.8V OUT
24V BATTERY
+
−
F1
F2
+
+
−
−
To 12V Loads
+
−
INFO
For specs of fuses F1 and F2
and wiring sizes, see Specifications
at Section 5.
!
i
4.3 Making Input & Output Connections & Operation
!
CAUTION!
1.
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, internal input side fuse (5, Fig 1.1) / external input side fuse F1 (Fig 4.1) will blow.
2. 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 F2
(Fig 4.1). Observe correct polarity.
NOTES:
1. All power ratings are specified for resistive load at Power Factor = 1.
2. All specifications given above are at ambient temperature of 25
°
C / 77
°
F.
3. Specifications are subject to change without notice
MODEL NO. SDC-15
SDC-23
CAUTION! There is no isolation between the input and the output sides.
Input and output have common Negative.
OUTPUT
OUTPUT VOLTAGE 13.8 VDC ± 0.1V @ 12A
13.8 VDC ± 0.1V @ 20A
CONTINUOUS OUTPUT CURRENT 12A
20A
PEAK OUTPUT CURRENT 15A
23A
CURRENT LIMIT 16 ± 0.5A
24 ± 0.5A
LOAD REGULATION > 0.5%
< 0.5
INPUT
INPUT VOLTAGE 20 - 35 VDC
20 - 35 VDC
INPUT CURRENT AT NO LOAD < 150mA
< 150mA
LINE REGULATION < 0.5%
< 0.5%
EFFICIENCY
(At maximum output)
> 88%
> 88%
RIPPLE < 10 mV P-P @ 12A
< 50 mV P-P @ 20A
NOISE < 40 mV P-P @ 12A
< 120 mV P-P @ 20A
FUSES
INTERNAL INPUT FUSE
(inside the fuse holder)
10A, 250V
(Bussmann AGC-10 or equivalent)
15A, 250V
(Bussmann AGC-15 or equivalent)
EXTERNAL INPUT FUSE
(At the battery end - Not supplied)
10A, 32V
(Automotive blade type: ATO/ATC)
15A, 32V
(Automotive blade type: ATO/ATC)
EXTERNAL OUTPUT FUSE
(not supplied)
15A, 32V
(Automotive blade type: ATO/ATC)
20A, 32V
(Automotive blade type: ATO/ATC)
PROTECTIONS
OUTPUT OVERLOAD / SHORT CIRCUIT
• Output current will be limited
to 16 ± 0.5A
• Output voltage will drop
• Output current will be limited
to 24 ± 0.5A
• Output voltage will drop
INPUT OVER VOLTAGE Input side fuse(s) will blow at > 37 VDC Input side fuse(s) will blow at > 37 VDC
OUTPUT OVER VOLTAGE Input side fuse(s) will blow at
> 16.5 ± 0.5 VDC
Input side fuse(s) will blow at
> 16.5 ± 0.5 VDC
REVERSE POLARITY ON INPUT SIDE Input side fuse(s) will blow
WIRES
INPUT WIRE SIZE #12 AWG
#10 AWG
OUTPUT WIRE SIZE #10 AWG
#8 AWG
ENVIRONMENT
OPERATING ENVIRONMENT Indoor use
Indoor use
OPERATING TEMPERATURE RANGE 0 - 40
o
C / 32 - 104
o
F
0 - 40
o
C / 32 - 104
o
F
DIMENSIONS
(W X D X H), MM 198 x 122 x 60
198 x 122 x 60
(W X D X H), INCHES 7.8 x 4.8 x 2.4
7.8 x 4.8 x 2.4
WEIGHT
KG 0.9
1.0
LBS 2.0
2.2
!
