Multiple Unit Connections
Current Sharing Connections - RP795xA, RP796xA
Parallel Connections
Connecting power supplies in parallel provides a greater current capability than can be obtained from
a single unit. The use of a master/slave configuration is required for models RP793xA, RP794xA, and
recommended for models RP795xA, RP796xA (refer to
).
Models RP795xA, RP796xA may be operated in parallel without using a master/slave configuration,
but the Current Sharing function must be explicitly enabled (refer to
Independent Parallel Operation
).
SHOCK HAZARD All paralleled units must be connected to qround through a grounded
power cord at all times. Any interruption of the protective (grounding) conductor or
disconnection of the protective earth terminal on any unit will cause a potential shock
hazard that could result in injury or death.
To Prevent Possible Equipment Damage:
l
Connect no more than twenty units of identical voltage ratings. All units must have
the same voltage rating but current ratings can be different. All units must have the
same version firmware installed. Refer to
for details.
l
Always turn the AC power on and off together. Never leave any units powered on
while the others are turned off.
l
For models RP795xA and RP796xA, always connect the negative output terminals
of all paralleled units together to prevent damaging the Sharing bus.
Load and Sense Connections
The following figures illustrate three units connected in parallel. Note the following recommendations:
l
Always install the paralleled units relatively close to each other.
l
Keep the cables from the power supplies to the load as short as possible and twist or bundle the
leads to reduce lead inductance and noise pickup. The goal is to minimize the loop area or phys-
ical space between the + and - output leads from the bus bars to the load.
l
A symmetrical arrangement of separate load-wire pairs of equal length connecting to a common
load point is highly recommended. This provides the best possible dynamic response.
2 Installing the Instrument
78
Keysight RP7900 Series Operating and Service Guide
Summary of Contents for RP7900 Series
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