HP NonStop G-Series - Manual (Page 17)

Overview of the Tape Library
L700 (CTL700) Installation and User’s Guide — 527338-004
1 -3
Power System
Power System
The CTL700 tape library power system consists of:
•
One or two AC power distribution units (PDUs) that:
°
Operate within a line voltage of 90 to 265 VAC, 50 to 60 Hz
°
Distribute AC voltage to the tape drives
°
Are protected by circuit breakers
•
One or two DC power supplies that provide voltage to the tape library
AC Power Distribution Units
When installing tape drives in a tape library that has two AC PDUs, attach each PDU to
a separate branch circuit.
Some power configuration examples are:
•
For total of eight tape drives, four tape drives can be placed in one column and four
tape drives may be placed in the other column. If one AC power circuit fails, four
tape drives are operational.
•
For a total of twelve tape drives, with six tape drives for Client 1 and six for Client
2, place three tape drives for Client 1 in one column and the other three tape drives
for Client 1 in the other column. Split the tape drives for Client 2 the same way. If
one AC power circuit fails, each client still has three working tape drives.
DC Power Supplies
If the tape library has two DC power supplies, both of them power the tape library
during normal operation. If a fault is detected in one power supply, the second DC
power supply assumes control and posts the error to the event log.
Compatibility
The CTL700 tape library can accommodate up to twelve CT9840-1/CT9840FC-1/
CT9841FC tape drives, up to twenty 5259 tape drives, up to twenty N1521A tape
drives, and up to twenty M8503 tape drives. A combination of all these tape drives can
be configured.