Ibm Zbx Cooling - IBM z13s Technical Manual

The following power cord options are available for the zBX:
FC 0531: 4.3 m (14.1 ft.), 60A/208 V, US power cord, Single Phase.
FC 0532: 4.3 m (14.1 ft.), 63A/230 V, non-US power cord, Single Phase.
FC 0533: 4.3 m (14.1 ft.), 32A/380 V-415 V, non-US power cord, Three Phase. Note that
32 A WYE 380 V or 415 V gives you 220 V or 240 V line to neutral. This voltage ensures
that the BladeCenter maximum of 240 V is not exceeded.
Power installation considerations
Each zBX BladeCenter operates from two fully redundant PDUs that are installed in the rack
with the BladeCenter. Each PDU has its own power cords as shown in Table 10-5, enabling
the system to survive the loss of customer power to either power cord. If power is interrupted
to one of the PDUs, the other PDU picks up the entire load, and the BladeCenter continues to
operate without interruption.
Table 10-5 Number of BladeCenter power cords
Number of BladeCenters
1
2
3
4
5
6
7
8
For maximum availability, the power cords on each side of the racks need to be powered from
separate building PDUs.
Actual power consumption depends on the zBX configuration in terms of the number of
BladeCenters and blades installed.
Input power in kilovolt-ampere (kVA) is equal to the outgoing power in kilowatt (kW). Heat
output expressed in kBTU per hour is derived by multiplying the table entries by a factor of
3.4. For 3-phase installations, phase balancing is accomplished with the power cable
connectors between the BladeCenters and the PDUs.

10.3.3 IBM zBX cooling

The individual BladeCenter configuration is air cooled with two hot-swap blower modules. The
blower speeds vary depending on the ambient air temperature at the front of the BladeCenter
unit and the temperature of the internal BladeCenter components:
If the ambient temperature is 25°C (77°F) or below, the BladeCenter unit blowers run at
their minimum rotational speed, increasing their speed as required to control internal
BladeCenter temperature.
If the ambient temperature is above 25°C (77°F), the blowers run faster, increasing their
speed as required to control the internal BladeCenter unit temperature.
If a blower fails, the remaining blower runs at full speed and continues to cool the
BladeCenter unit and blade servers.
Number of power cords
2
4
6
8
10
12
14
16
Chapter 10. Environmental requirements
377