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9176/D173 D
ISK SUBSYSTEM - SITE PREPARATION GUIDE 17
S
IXTH EDITION
Wiring and Power
The StorageTek 9176/D173 Disk Subsystem typically comes in its own rackmount cabinet
with all internal power is supplied via the cabinet’s power distribution unit (PDU).
StorageTek provides a rackmount cabinet user’s guides specific to the customer’s needs.
StorageTek service representatives may obtain this manual (P/N 95932) from “Documents
on CD”, or download it from the engineering web page. Specific power requirements are
spelled out in this manual.
StorageTek 9176 Disk Controller
The 9176 Disk Controller is a 120/220 VAC, 50/60 Hz unit that meets standard voltage
requirements for both domestic (USA) and international operation. It uses standard
industrial wiring with a line-to-neutral power connection. See Table 7 for nonstandard
installations.
•
Earth ground - The unit must be properly grounded including an earth ground
conductor on the AC power source.
•
Circuit overloading - Make sure the power circuits and associated circuit breakers in
the cabinet and building provide sufficient power and overload protection. To prevent
possible damage to the unit, isolate its power source from large switching loads (for
example, an air conditioning motor, elevator motor, factory equipment).
•
Power interruptions - The unit will withstand the following voltage interruptions:
Input transient (50% of nominal voltage), Duration (one half-cycle), Minimum
frequency (once every 10 seconds).
•
Power failures - Once power is restored after a complete power failure, the unit
automatically performs a power-up recovery sequence without operator intervention.
•
Power Supply voltage range - Wide-ranging, redundant 175 W power supplies
operate on 90-264 VAC at 50 or 60 Hz. The DCPS meets international requirements,
and can operate at any voltage with the specified range.
Table 7 Controller Tray Site Wiring Voltages
Input Power
Connection
50 Hz 60 HZ
Nominal Minimum Maximum Nominal Minimum Maximum
Single-Phase
Line-to-Neutral
100 90 107 100 90 107
127 114 136 120 104 127
220 198 235 220 198 235
240 216 264 240 216 264