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IDC 100 SERIES DC-DC ISOLATED CONVERTERS
The Samlex America IDC Series is a complete line of isolated DC-DC converters suitable for applications requiring galvanic isolation between the input and the
output. They are distinguished by high efficiency (~ 85%), absolute safety, reliability and compact design. The converters are based on high performance, fixed
frequency switching regulator. The line covers nominal input voltages of 12, 24, 48 and 72 VDC and nominal output voltages of 12 / 24 VDC. The units are EMI
/EMC compliant and conform to the European standards EN50081-1 / EN61000-6-3 (for emission) and EN50082-1 / EN61000-6-1 (for immunity). Versions with 12
V / 24 V inputs also conform to the European Automotive Directive 95/54/CE.
The input to output isolation can provide either an isolated output power source, or generate different voltage rails and / or dual polarity rails. These configurations
are most often found in instrumentation, data processing and other noise sensitive circuits where it is necessary to isolate the load and noise presented to the local
power supply rails from that of the entire system. The isolated positive output can be connected to the input ground rail to generate a negative supply rail, if
required.
Galvanic isolation of the output allows multiple converters to be connected in series. In this way, non-standard voltage rails can be generated. For series
connection, additional filtering is strongly recommended as the converters' switching circuits will not be synchronized and will result in summation of the ripple
voltages. The output could also produce relatively large beat frequencies. A capacitor across the output will help, as will a series inductor.
All models are covered by Samlex America's two year warranty and offer an MTBF of approx 500000 hours. Applications include DC to DC conversion
requirements for tractor trailers, forklifts, heavy machinery, locomotive/ railroad, bus conversions, consumer aviation and marine craft.
INSTALLATION & OPERATION
General Installation Requirements
-This unit is cooled by convection. Install the unit in a cool, dry & well ventilated space.
-Do not install the unit inside the engine compartment.
-Do not connect / disconnect input and output connections when live voltages are present.
WARNING! This unit is not a Battery Charger. Please do not use it to charge a battery.
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 suitable 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 +" 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 o C. Please refer to details of input/output wire sizes under "Specifications".
Type of input and output connections
The unit has a terminal block with 4 male, quick connect flat blade type terminals (6.3 mm / ¼ in.) for quick connection / disconnection. Two blades are for
input (Marked "Input +" and "Input –") and two are for output (Marked "Output +" and "Output –"). The wiring for connection to the terminals should be
terminated with the corresponding female quick connect terminals meant for the above male 6.3 mm / ¼" flat blade type terminal.
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.
Input Connection for IDC-100C & IDC-100D (versions prior to "Revision R5")
When the converter is used in a fork lift that operates on 30V or higher (versions IDC-100C or IDC-100D), use an isolation diode in series with the "Input +"
terminal. IDC-100C & IDC-100D come with this diode. This diode prevents reverse flow of high current into the input battery if the battery voltage dips. This
diode has a female quick connect on the cathode side and a male quick connect on the anode side. Connect the cathode side to the "Input +" terminal of the
converter and the anode side to the battery. For versions "Revision R5" and onwards, this diode is incorporated inside the unit
Protections
Overload/Short circuit: Overloading beyond the maximum output current value (8A for IDC-100x-12 & 4A for IDC-100x-24) will produce voltage drop on the
output side. The output will recover automatically once the overload condition is removed.
Under short circuit conditions on the output side, the voltage will drop to near 0 volts. There is automatic reset once the short circuit condition is removed.
Over voltage on the output side: In case of over voltage, a zener diode across the output will conduct and simulate short circuit protection (see above).
Over voltage / transients on the input side: A Metal Oxide Varistor (MOV) across the input terminals provides protection against high voltage transients by
blowing the input side fuse(s).
Reversal of polarity on the input side connection: In case of reversal on input side polarity, a diode connected across the input terminals will conduct and
will blow the input side fuse(s).
Over temperature: In case of over heating, the output voltage will drop. It will reset automatically once the temperature drops to normal.
OWNER'S MANUAL
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