Qualstar XLS-810160, Site Planning Manual

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3
Installing the Library
XLS Library Site Planning Guide 3-9
3.3.2 Power Consumption
Power consumption varies with the number of tape drives installed, the number of tape
drives operating simultaneously, and the occurrence of robotic motion.
Table 3-6 lists the
power requirements for a few typical system configurations as well as for a single tape
drive or MEM2. You can use these number to determine the actual power needs of any
system configuration.
In Table 3-6 the typical power figures indicate the power consumed when the robotic
handler and tape drives are idle. The peak power figures indicate the power consumed
when the robotics are accelerating and all of the tape drives are writing. The peak power
levels are not expected to last for more than two seconds at a time.
If your system has a large number of tape drives, connect it to a 208- to 240-volt source to
reduce the peak AC input current. The integral circuit breaker will trip at 20 amps. In
general, Qualstar recommends 220-volt input power. Using a 220-volt source will prevent
input power from being an issue during upgrades.
An uninterruptible power source (UPS) is strongly recommended. Be sure the UPS is
rated to handle the peak power loads listed in
Table 3-6 .
3.4 Cooling Requirements
The XLS draws fresh cooling air through the grille and air filters on the front of the
library and exhausts warm air out the back. The BTUs/hour figures in
Table 3-6 , above,
indicate the air conditioning capacity needed to remove the heat generated by example
XLS systems.
System configuration
Peak
Consumptrion
Typical
Consumptrion
1 library with 6 tape drives
550 watts
1,878 BTUs/hr
350 watts
1,195 BTUs/hr
1 library with 10 tape drives
675 watts
2,305 BTUs/hr
430 watts
1,469 BTUs/hr
Each tape drive adds
35 watts
120 BTUs/hr
24 watts
82 BTUs/hr
A MEM2 adds
157 watts
536 BTUs/hr
16 watts
55 BTUs/hr
Table 3-6 Approximate XLS power consumption based on LTO tape drives