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9176/D173 D
ISK SUBSYSTEM - SITE PREPARATION GUIDE 19
S
IXTH EDITION
•
four or more drive trays - using four, 90–136 volt, 15 Amp circuits. Connect half
of the 9170 drive trays to two circuits and the remaining drive trays to the other two
circuits. Make sure that each drive tray connects to two different circuits (one per
power supply).
•
Redundant AC Power, nominal 240 volt - Use two 200–264 volt, 15 Amp circuits.
Connect one power supply from each drive tray to one circuit and the other power
supplies to the second circuit.
•
Power supply voltage ranges - The auto-ranging power supplies automatically match
the voltage range (120 VAC or 220 VAC) to the AC power source. This means that you
can switch the 9170 power supplies to alternative power source voltages (120 VAC to
220 VAC).
CAUTION Wait at least 10 seconds between each voltage change before powering up
the drive tray to prevent damage to the power supplies.
9170/D173 Current Rating
The 9170 and D173 are rated at 3.6 amperes at 120 volts and 1.8 amperes at 240 volts.
Actual current drawn varies slightly depending on the number and type of drive modules
you have installed. Drive modules rated at 1.2 amperes at 12 volts DC have little impact
on the overall rating of the 9170 Disk Array operating on a 220 volt circuit.
NOTE StorageTek’s 9170/D173 drive modules have been designed for a staggered
start-up since this is the time of the greatest current demand. This helps ensure
that current does not exceed design ratings during power up.
Table 9 Drive Tray Site Wiring Voltages
Input Power 50 Hz 60 Hz
Connection Nominal Minimum Maximum Nominal Minimum Maximum
Single-Phase
Line-to-
Neutral
1009010710090107
127 114 136 120 104 127
220 198 235 220 198 235
240 216 264 240 216 264