NEC N8405-019, User Manual

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Remaining Power
Indicates the power unallocated to any components.
NOTES:

The following equation is satisfied:
(Maximum power consumption) = (allocated power) + (remaining
power)
 If the value specified for "Maximum Input Power" is lower than that
of the allocated power while the powers for CPU blade and switch
modules are secured, the remaining power is represented in negative
value. If you power off the CPU blade and then try to power on,
power-on is suppressed due to "Insufficient power". See
"Configuration" described later for how to specify the "Maximum
Input Power".

When UPS units are installed and the Built-in UPS unit support is
enabled, remaining power may be less than 0W because maximum
power consumption is exceeded by allocated power, but this is not a
problem.
When using UPS units, maximum power of a UPS unit is displayed
as maximum power consumption. In this case, power is allocated to
the CPU blades so that power consumption at power saving state
which they enter at power failure is within the maximum power of a
UPS unit.
Therefore, under normal operation, power may be allocated to the
CPU blades exceeding the maximum power of a UPS unit.