Current Sharing Operation
Enable the Current Sharing Function
Program the On Couple and Off Couple Function
Program the Output Voltage and Current
Program a Step Function for Additional Output Changes
Enable the Output and Trigger the Additional Output Changes
Specification Effects
Current Sharing Effects
Introduction
Equipment Damage For parallel operation, only connect power supplies that have
the same voltage rating.
Current sharing is an analog control function that fine-tunes the output voltage up to about 0.5% of
the unit's voltage rating, so that multiple units may be paralleled when operating in voltage or current
priority mode. In this way, models having the same voltage rating can share current equally among
participating units.
The current sharing setup consists of paralleling the output terminals and connecting the Sharing
cable as described under Parallel Connections. The Sharing cable provides the analog signal that
allows units of the same voltage rating to share current equally.
You must also connect and program the output On Couple and Off Couple digital port signals to
provide synchronized instrument turn-on and turn-off capability.
Finally, you must also use the transient step generator to program any subsequent output voltage (or
current) values so that all programmed changes will be synchronized across units. Configure one of
the digital port pins to generate and receive the Step trigger.
The following list details the current sharing operation.
l Connect no more than five units of identical voltage ratings in parallel.
l Do not parallel N6900 models with N7900 models.
l If any paralleled units are turned on or off while current sharing, the load current will automatically
be shared among the remaining active units, provided that the required load current is within the
current capability of the remaining units.
l Units of mixed power (1 kW and 2 kW) with the same voltage rating can participate in current shar-
ing. This lets you take advantage of the higher current capability of the 2 kW units.
Keysight N6900/N7900 Series Operating and Service Guide 167
4 Using the Advanced Power System
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