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Level 01f
Power installation considerations
zEC12 operates from two fully-redundant power supplies. These redundant power supplies each have
their own line cords, or pair of line cords, allowing the system to survive the loss of customer power to
either line cord or line cord pair. If power is interrupted to one of the power supplies, the other power
supply will pick up the entire load and the system will continue to operate without interruption.
Therefore, the line cord(s) for each power supply must be wired to support the entire power load of the
system.
Note: The power cord set(s) provided are for use only with this product.
For the most reliable availability, the line cords in the front (A) and the rear (B) of the Z frame should be
powered from different PDUs. The A line cord or cords exit the front of the Z frame and should be
connected to one PDU. The B line cord or cords exit the rear of the Z frame and should be connected to a
different PDU than the A cord or cords.
See Appendix D, "3-phase dual power installation," on page 133 for examples of typical redundant
wiring facilities.
The power supplies at the front end of the system use active resistive load synthesis. Harmonic distortion
of the current waveform is small enough that it need not be considered in planning the installation. The
power factor is typically 0.95 or higher.
The utility current distribution across the phase conductors (phase current balance) depends on the
system configuration. Each front end power supply is provided with phase switching redundancy. The
loss of an input phase is detected and the total input current is switched to the remaining phase pair
without any power interruption. Depending on the configuration input power draw, the system can run
from several minutes to indefinitely in this condition. Since most single phase losses are transients which
recover in seconds, this redundancy provides protection against virtually all single phase outages.
Supply type
Two or four redundant
3-phase line cords
Two or four redundant
DC line cords
Source type
Three-phase (60A plug)
Three-phase (all except 60A plug)
Three-phase (all except 60A plug)
DC
66
zEC12 IMPP
Nominal voltage range (V)
200-480
380-520
Frequency
50/60 Hz
50/60 Hz
50/60 Hz
N/A
Voltage tolerance (V)
180-509
350-550
Input voltage range (V)
200 - 240V
380 - 415V
480V
380 - 520V
Frequency range (Hz)
47-63
N/A
Rated input current (A)
48A
25A
20A
44A
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