IBM DS8900F, Введение и руководство по планированию

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• Two independent power outlets for the two power cords that are needed by each model.
Important: To eliminate a single point of failure, independent power feeds to each DS8000 power
supply are required. At least one of the feeds should have power conditioning to ensure an acceptable
level of power quality as specified in standards such as ANSI C84.1 and EN 50160. Further, each power
source must have its own wall circuit breaker.
Attention: Ensure that there is a local site disconnect and/or isolation means (such as a service
branch circuit breaker, power feed switch, and/or wall socket outlet to an industrial style plug) for
each AC main power cord to a system. The internal rack (system side) appliance cord coupler is
NOT intended to be connected or disconnected live. Follow local electrical authority site
regulations for proper isolation practices such as Lock Out Tag Out (LOTO) and/or approved
procedures.
CAUTION: No Live Plugging. Appliance coupler (machine connector end) of line cord is not
intended for electrically live (hot) plugging nor for interrupting current (disconnecting under load).
Isolate input power to the identified cord from the service branch circuit. Whenever attaching,
unplugging, or leaving the plug disconnected, remove voltage by unplugging the wall end of that
cord, or by turning off the breaker or the switch for that cord.
Input voltage requirements
When you plan for the power requirements of the storage system, consider the input voltage
requirements.
The following table provides the input voltages and frequencies that the storage system supports.
Table 45. Single-phase input voltages and frequencies
Characteristic
Voltage (single-phase)
Nominal input voltages 200-240 RMS V AC
Minimum tolerated input voltage 180 RMS V AC
Maximum tolerated input voltage 256 RMS V AC
System maximum current rating Model 996 24/32 Amps (per PDU cord)
Model 994 24/32 Amps (per PDU cord)
Wall breaker rating (1 ph)
1
Model 996 US, Canada, and regions that require 20%
derating factor 30 - 63 Amps
Model 996 Geos with no derating requirement 30 - 63
Amps
Model 994 All regions 30 - 63 Amps
Steady-state input frequencies 50 ± 3 or 60 ± 3.0 Hz
PLD input frequencies (<10 seconds) 50 ± 3 or 60 ± 3.0 Hz
1. Regions such as the United States and Canada require 20% derating for power distribution circuits.
For these regions, a minimum 50 A circuit breaker is required for a 40 Amp rated system. Verification
of applicable local standards is required for system installation. Some configuration restrictions to
limit power consumption can allow reduced breaker ratings on a regional basis.
Chapter 6. Delivery and installation requirements 95