l To determine the total load current, you must sum the output current readings of the individual par-
alleled units.
Equipment Damage Always turn the AC power on and off together. Never leave any
units powered on while the others are off. If AC power is turned on or off on a single
coupled unit, the outputs of the remaining units that are still powered on will be
enabled and will transition to their programmed settings. To prevent this from
happening, program the outputs of all coupled units to zero before powering them
off, and always turn AC power on or off together on all coupled units.
The following list details the current dissipating requirements for units that are connected in parallel.
This assures that current-sharing is maintained throughout both sourcing and sinking operating
quadrants.
l For identical power-rated models with no dissipator – all units will share current equally.
l For identical power-rated models with dissipators – all units require equivalent current dissipation
capability. For example, if you have a 2 kW unit with one dissipator, each paralleled unit requires
one dissipator to current-share correctly. If you have a 2 kW unit with two dissipators, each par-
alleled unit requires two dissipators to share current equally.
l For dissimilar power-rated models (1 kw and 2 kW units) with no dissipators – all units will share
current proportionately.
l For dissimilar power-rated models (1 kw and 2 kW units) with dissipators – all units require cur-
rent-dissipation capability equal to the full output-rating of the unit. For example, if you have a 1
kW unit with one dissipator in parallel with a 2 kW unit, the 2 kW unit requires two dissipators to
share current proportionately.
Enable the Current Sharing Function
This lets you configure the units for parallel or non-parallel operation with the current sharing cable
installed. When current sharing is enabled, the front panel status indicator displays a "P", indicating
that the sharing function has been enabled and the sharing relay has closed to connect the instrument
to the Sharing bus.
Front Panel Menu Reference SCPI Command
Select Output\Advanced\CurrSharing
Check Enable current sharing to enable.
To enable current sharing:
CURR:SHAR ON
When the output is disabled, the sharing relay automatically opens and disconnects
the unit from the Sharing bus.
Program the On Couple and Off Couple Function
Refer to Output Couple Control for details. Connect the On Couple and Off Couple signal to the
paralleled units as shown in the following figure:
4 Using the Advanced Power System
168 Keysight N6900/N7900 Series Operating and Service Guide
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