HP Insight Control - Manual (Page 10)

Power delivery device total capacity calculations
If you know the line current (lineCurrent), line voltage (lineVoltage), and type of phase for the
device, the total capacity of a power delivery device can be calculated using the following formulas:
For 3-phase Wye:
phaseVoltage = lineVoltage / sqrt(3)
phaseAmps = lineCurrent
phaseWatts = phaseVoltage * phaseAmps
TotalCapacity = 3 * phaseWatts
For 3-phase Delta:
phaseVoltage = lineVoltage
phaseAmps = lineCurrent / sqrt(3)
phaseWatts = phaseVoltage * phaseAmps
TotalCapacity = 3 * phaseWatts
For 1-phase:
TotalCapacity = lineCurrent * lineVoltage
Converting Watts to Amperes
If you know the Watts value (watts), Voltage value (volts), and type of phase for the device, the
watts can be converted to amperes using the following formulas:
For 3-phase Wye or Delta:
amps = (watts / volts) / sqrt(3)
For 1-phase:
amps = watts / volts
Converting Amperes to Watts
If you know the Amperes value (amps), Voltage value (volts), and type of phase for the device, the
amperes can be converted to watts using the following formulas:
For 3-phase Wye or Delta:
watts = amps * volts * sqrt(3)
For 1-phase:
watts = amps * volts
Data Center Power Control
HP Insight Control power management provides you with the Data Center Power Control facility
to control power and cooling for the systems in the data centers. Usually, data centers have the
required power and cooling capacity for the supported systems they contain. When the power
and cooling capacity is interrupted or reduced, the consumption must be adjusted to match the
change. Some examples of sudden capacity reduction include loss of external power, chiller
failures, and utility company demands for cutbacks.
The Data Center Power Control facility provides a means to predefine the responses to such events,
creating flexible rules in Systems Insight Manager that can be invoked when such events occur.
The rules can determine the set of systems that need to be adjusted based on criteria evaluated
when the event occurs. The rules also specify actions that should be taken on those systems. These
rules allow for flexible event responses such as shut down all of the low-priority systems in the data
center and make the medium-priority systems operate in low power mode.
10 Key concepts