AC Mains Connections
AC Mains Considerations
Power Cable Connections
AC Mains Considerations
Keysight MPS systems have a fully bi-directional three-phase ac input converter, which allows for
seamless bi-directional power flow between the ac mains and dc output terminals.
In a standard power supply, energy only flows from the ac to the dc output terminals. In a regenerative
power system, energy also flows from the dc output terminals back to the ac mains whenever the unit
is sinking current, either from rapid down-programming of the output or from discharging an energy
source such as a battery. This return of energy back to the ac mains is referred to as regenerative
operation.
The ac input converter of the MPS system employs firmware algorithms to maintain high power factor
and low total harmonic distortion across a wide range of operating conditions. For power factor
information, refer to the ac input portion of the Common Characteristics section.
Exceeding the ac input voltage rating or miswiring the line connection can create
permanent damage in the following devices.
Power Cable Connections
Compliance to all regulations for the operation of and connection to the public grid of
energy back-feeding equipment is required.
AC mains connections must be made by a qualified electrician who is knowledgeable
about energy back-feeding equipment to ensure that all applicable safety requirements
have been applied and all necessary conditions have been met. Knowledge about 3-
phase mains circuits and all applicable safety standards and requirements is also
required.
An ac mains power cable is not provided with the unit.
Refer to the following table for the maximum current capacity requirements for each cable conductor.
If required by local electrical codes, install a fuse or circuit breaker between the ac mains and the unit.
Power cords other than the recommended cords may not fit through the strain relief of the ac cover.
Model Power cord recommendation Max input current/ phase L1, L2, and L3
Keysight MP4301A 10/4 SJOOW Cord 300 V UL/CSA 23.1 A
Keysight MP4302A 12/4 SOOW Cord 600 V UL/CSA 12.2 A
Keysight MP4300 Series Operating and Service Guide 41
2 Installing the Instrument
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