Parallel Connections
Load, Sense, and Sharing Connections
Parallel Description
Connecting power supplies in parallel provides a greater current capability than can be obtained from
a single unit. The use of current sharing is highly recommended (for further information refer to
). Note that units can be operated in parallel without using the current sharing
function, but the output current will not be shared equally and constant voltage mode operation may
not be maintained on all units.
To Prevent Possible Equipment Damage:
l
Connect no more than five units of identical voltage ratings in parallel.
l
Do not parallel N6900 models with N7900 models.
l
Always connect the negative output terminals of all current-sharing units together
to prevent damaging the Sharing bus.
l
Always turn the AC power on and off together. Never leave any units powered on
while the others are turned 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 pro-
grammed 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.
Current sharing considerations:
l
The Sharing terminals must be connected for current sharing operation as shown in the figure
under Load, Sense, and Sharing Connections. If the Sharing cable is disconnected, the paralleled
units will still operate, but will not share current or maintain constant voltage mode operation.
l
Do not use local sensing if there can be a voltage drop greater than 0.5% of the voltage rating of
the units as measured from the local sense points of any unit to the local sense points of any other
paralleled unit. Use remote sensing as shown under Load, Sense, and Sharing Connections.
l
Turn the outputs on and off together for clean output on/off operation. It is recommended to use
the digital I/O pins to couple the output turn-on/turn-off transitions between the units as
described under
.
l
When units are configured with output coupling enabled, the voltage on all units should be pro-
grammed to zero volts prior to turning off AC power.
2 Installing the Instrument
76
Keysight N6900/N7900 Series Operating and Service Guide
Summary of Contents for N6900 Series
Page 1: ...Keysight Advanced Power System N6900 N7900 Series Operating and Service Guide...
Page 2: ......
Page 63: ...1 kW Models Keysight N6900 N7900 Series Operating and Service Guide 63 1 Quick Reference...
Page 64: ...2 kW Models 1 Quick Reference 64 Keysight N6900 N7900 Series Operating and Service Guide...
Page 78: ...2 Installing the Instrument 78 Keysight N6900 N7900 Series Operating and Service Guide...
