Keysight Technologies RP7900 Series, Operating And Service Manual

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Regenerative Operation
Compliance to all regulations for the operation of and connection to the public grid of
energy back-feeding equipment is required. Connections must be made by a qualified
electrician who knows about energy back-feeding equipment to ensure that all
applicable safety requirements have been applied and all necessary conditions have
been met.
Whenever the unit is sinking current, either from rapid downprogramming of the output, or from
discharging an energy source such as a battery, the unit will direct the excess power back to the AC
mains through the power cord. In case of an AC mains power failure, the unit will automatically
disconnect from the AC mains. This occurs even when the unit is directing power back to the AC mains.
Output Connections
Sense Connections
Ensure that the sense cable is installed on the back of the instrument as shown. The only time the
sense cable should be disconnected from the output bus bars is when
remote sensing .
If the sense cable is not installed prior to instrument turn-on or becomes disconnected, the unit will
continue to operate. The open-circuit voltage at the output terminals will be anywhere from 0% to
0.54% higher than the programmed value because the regulation point is now maintained through
internal sense-protect resistors. The following table gives the change in voltage at the output
terminals as a percent of the voltage setting when the sense leads are not connected. The readback
voltage will still appear to be at the programmed value.
Model Δ Gain percent
RP7931A, RP7941A, RP7933A, RP7943A * 0 %
RP7932A, RP7942A, RP7935A, RP7945A + 0.54 %
RP7936A, RP7946A + 0.27 %
RP7951A, RP7952A, RP7961A, RP7962A + 0.13 %
RP7953A, RP7963A + 0.06 %
* For the 20 V RPS units only, the sense leads are buffered so that there is virtually no change in the
open-circuit output voltage if the sense cable is not installed or becomes disconnected.
2 Installing the Instrument
68 Keysight RP7900 Series Operating and Service Guide