NonStop NS1000 Planning Guide (H06.06+)

System Installation Specifications
HP Integrity NonStop NS1000 Planning Guide—542527-002
3-4
Enclosure AC Input
Branch circuit requirements vary by the input voltage and the local codes and
applicable regulations regarding maximum circuit and total distribution loading. Select
circuit breaker ratings according to local codes and any applicable regulations for the
circuit capacity.
Enclosure AC Input
Enclosures (such as blade element, IOAM, and so forth) require:
Each PDU is wired to distribute the load segments to its receptacles. Refer to Power
Distribution Units (PDUs) on page 5-5. Factory-installed enclosures are connected to
the PDUs for a balanced load among the load segments.
Enclosure Power Loads
The total power and current load for a modular cabinet depends on the number and
type of enclosures installed in it. Therefore, the total load is the sum of the loads for all
enclosures installed. For examples of calculating the power and current load for
various enclosure combinations, refer to Calculating Specifications for Enclosure
Combinations on page 3-11.
In normal operation, the AC power is split equally between the two PDUs in the
modular cabinet. However, if one of the two AC power feeds fails, the remaining AC
power feed and PDU must carry the power for all enclosures in that cabinet.
Note. If your system includes the optional rackmounted HP R5500 XR UPS, the modular
cabinet will have one PDU located on the rear left side and four extension bars on the rear right
side.
Specification Value
Nominal input voltage 200/208/220/230/240 V ac RMS
Voltage range
*
180-264 V ac
Nominal line frequency 50 or 60 Hz
Frequency ranges 47-53 Hz or 57-63 Hz
Number of phases 1
* Voltage range for the maintenance switch is 200-240 V ac.
Caution. If you are installing Integrity NonStop NS1000 system enclosures in a rack, balance
the current load among the available load segments. Using only one of the available load
segments, especially for larger systems, can cause unbalanced loading and might violate
applicable electrical codes. Connecting the two power plugs from an enclosure to the same
load segment causes failure of the hardware if that load segment fails.
Note. If your system includes the optional rackmounted HP R5500 XR UPS, the modular
cabinet will have one PDU located on the rear left side and four extension bars on the rear right
side.