Serial Connection Of Output Channels - Fluke PM2811 User Manual

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5.6.2

Serial connection of output channels

Connecting output channels in series provides a greater voltage capability than
can be obtained from a single output channel. In principle, you can put more than
two output channels in series. However, there is the limitation that the total
maximum voltage of each terminal may not exceed 240V with respect to the
ground.
Output channels in serial configurations can operate in either Constant Voltage
(CV) or in Constant Current (CC).
CV OPERATION
For CV operation all output channels must be in the CV mode. Program the
current setting of all output channels to the desired current limit point. Then
program the voltage setting of each output channel, so that the sum of all
voltages equals the total desired operating voltage. The simplest way to
accomplish this is to program each output channel to an equal part of the total
desired operating voltage, e.g., three output channel settings of 25 V in series
provide 75 V.
CC OPERATION
For CC operation the current setting of each output channel must be
programmed to the desired operating current. The sum of the voltage settings
determines the voltage limit points. As an example, consider two output
channels in series (refer also to section 5.6.2.1). Program the voltage setting
of both output channels to one half of the total voltage limit point. At load
1
voltages < /
2
in the CC mode. At load voltages >
channel that was in the CC mode will change to the CV mode, while the other
output channel will regulate the current in the CC mode and provide the
balance of the voltage required by the load.
Note that the total voltage over the load is the sum of the individual readback
output voltages, provided the load voltage <
WARNING: To guarantee the safe use of the power supply, the total
maximum voltage at each terminal must not exceed 240V with
respect to ground.
There are two ways of sensing the load when connecting output channels in
series, i.e., local sensing and remote sensing.
of the total voltage limit point, one output channel will operate
1
/ of the total voltage limit point, the output
2
1
/ of total voltage limit point.
2
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