becomes the lower limit, and the output current remains constant and the output voltage drops in proportion to the
further decrease of the load resistance.
Similarly, crossover from constant current (CC) to constant voltage (CV) mode automatically occurs when the
resistance of the load is increased. A good example of this behavior is charging a 12V lead acid battery. Initially, the
open circuit voltage of the power supply may be set at 13.8V. A discharged battery when connected to the power
supply may demand high charging current beyond the current limit set for the power supply (or the maximum current
capacity of the power supply), and the power supply will operate in constant current mode, with the maximum
charging current equal to the set current limit. As the battery becomes more charged, the voltage will increase, and
eventually reach 13.8V. Beyond that point, the current demand from the battery will drop and fall below the set limit.
The crossover is signaled by the indicator light change from CC to CV.
3-3 Operating Procedures
a) With the power switched off, leave the OV limit (11) to maximum position (factory default) or adjust per
instructions at 3-5.
b) Make sure that the AC line voltage matches the input voltage of the power supply.
c) Make sure there is no load connected, plug power cord into the AC outlet.
d) Turn the power supply on.
Caution: For models with air switch, the green On/Off button enables/disables the output. Turn on the air
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