Lodestar LS1130 Instruction Manual - page 13
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For example, if the load is such that the power supply is operating in the constant
voltage mode, a regulated output voltage is provided. The output voltage remains
constant as the load increases, up until the point where the preset current limit is
reached. At that point, the output current becomes constant and the output voltage
drops in proportion to further increases in load. The crossover point is indicated by
the front panel LED indicators. The crossover point is reached when the CV indicator
goes off and the CC indicator comes on.
Similarly, crossover from the constant current to the constant voltage mode
automatically occurs from a decrease in load. A good example of this would be seen
when charging a 12-volt battery. Initially, the open circuit voltage of the power
supply may be preset for 13.8 volts. A low battery will place a heavy load on the
supply and it will operate in the constant current mode, which may be adjusted for a 1
amp charging rate. As the battery becomes charged, and its voltage approaches 13.8
volts, its load decreases to the point where it no longer demands the full l amp
charging rate. This is the crossover point where the power supply goes into the
constant voltage mode.
5.5 Connecting Two Power Supplies in Series
Two Model LS1130 power supplies may be connected in series to provide a variable
0-60 volt output. In this configuration the power supply can supply up to 3 amps, see
figure below for hook-up.