Keysight Technologies RP7900 Serie Guide D'utilisation Et De Maintenance page 125

Current sharing is an analog control function that fine-tunes the output voltage up to about 0.5% of
the unit's voltage rating. This improves the current readback accuracy among paralleled units. This
applies whether units are connected for primary/secondary operation or whether they are connected
for independent parallel operation.
Units of equivalent current ratings will share current equally. Units of dissimilar current ratings will
share current according the ratio of their current rating. For example, a unit rated at 40 A and a unit
rated at 20 A will share their output current in a 2-to-1 ratio.
In Independent Parallel operation only, the front panel status displays a "P", indicating that current
sharing is enabled and the sharing relay has closed to connect the unit to the sharing bus. When the
output is disabled, the sharing relay opens and disconnects the unit from the sharing bus.
Front Panel Menu Reference
Select Output\Advanced\CurrSharing
Check Enable current sharing to enable.
Current Sharing Operation
In voltage priority mode:
Program the initial output voltage setting of each paralleled unit to the same value.
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Set the current limit of each unit according to the following equations. This lets all units share cur-
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rent until the total current limit point is reached, which is the sum of the individual current limits.
For each 5 kW unit: I
CL_5kW
For each 10 kW unit: I
CL_10kW
where:
I is the current limit setting of the 5 kW unit
CL_5kW
I is the current limit setting of the 10 kW unit
CL_10kW
I is the sum total of all individual current limits
CL_TOTAL
N T is the total number of paralleled units of any rating
N 10kW is the total number of paralleled 10 kW units
*If there are no 10 kW units used, then N
Note that in a mixed power configuration, you must set the current limit of the 10 kW units to twice the
value of the 5 kW units. This is because in a mixed power configuration, each 10 kW unit will contribute
twice as much current as each 5 kW unit.
When the current limit setting of any paralleled unit is reached, the output current of that unit will limit
at its specified setting.
In current priority mode:
Set the voltage limit of each paralleled unit to the same value.
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Program the current setting of each paralleled unit according to the equations above if current
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sharing is desired. The total output current will be the sum of all the individual current settings.
Keysight RP7900 Series Operating and Service Guide
To enable current sharing:
CURR:SHAR ON
=I / (N +N
CL_TOTAL T 10kW
=2(I ) /( N +N
CL_TOTAL T
= 0.
10kW
4 Using the Regenerative Power System
SCPI Command
)*
)
10kW
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