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CONNECTION AND OPERATION
NOTE: The DC output connectors (RED + and Black -) have a tubular hole of
diameter 0.2" (5mm) with a set screw. If bare wire with stranded conductors is
used to connect the load to the above output connectors of the power supply, the
strands will spread out as the set screw is tightened and hence, the set screw will
not pinch all the strands. As a result, the effective cross section of the current
conducting area of the wire will be reduced resulting in voltage drop at the load
end, reduced efficiency and also overheating. For a firm connection, crimp / sol-
der a suitable pin type of copper terminal on the wire end to be connected to the
power supply. For convenience, a pair of terminals has been provided for crimp-
ing / soldering to the wire end.
OPERATION
•
Ensure that the on / off switch on the power supply is switched off and it is un-
plugged from the AC outlet
•
Switch off the 12 V load to be connected to the power supply. Connect the
positive input wire of the load to the RED (Positive) terminal of the power supply
and the negative input wire of the load to the BLACK (Negative) terminal of the
power supply. Ensure that the connections are secure and tight
•
Plug the power supply into the AC outlet. Press the On / Off switch of the power
supply to the On position and check that the switch is illuminated indicating
availability of the AC input power. If the On / Off switch is not illuminated, recheck
the AC input connection, AC outlet and the fuse inside the power supply.
•
Now switch on the DC load
•
Ensure that the continuous load is limited to 30 A
COOLING FAN CONTROL / THERMAL PROTECTION
WARNING! Operate the unit in a well ventilated, open and cool area. Do not block
the openings at the fan discharge on the bottom of the unit and the suction
openings on the sides.
The units are cooled by convection and by forced air cooling. A temperature
controlled fan has been provided to improve cooling at higher loads and at
higher ambient temperatures. The switching on of the fan is controlled by a sen-
sor mounted on the power transformer. The fan will be switched on when the
temperature of the sensor reaches 60° C +/- 5° C. The fan will be automatically
switched off when the sensor cools down to 50° C +/- 5° C. Thus, at lower loads
or during lower ambient temperatures, the fan may remain switched off.
An additional protection is provided to shut down the power supply in case the fan
fails or if the air flow is blocked or if the ambient temperature is very high. A second
temperature sensor is also mounted on the power transformer and will activate at
105° C +/- 5° C and shut down the output of the power supply. After the power
supply cools down to 95° C +/- 5° C, the temperature sensor will de-activate and
the power supply will resume operation automatically
4.
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