Appendix C. Library Diagrams
“Control Module Electrical System” on page C-5
“Control Module and Expansion Module Electrical System” on page C-6
“Interpreting Library Diagrams” on page C-2
The library power system includes red48 VDC power supplies with
current sharing outputs. The same power system is used in both control modules
(CM) and expansion module (EM). The redundant configuration power supplies
may be hot swapped without interrupting library operation. Each supply in a CM
and EM includes its own input AC line cord. During redundant operation, each
supply carries one-half the power load. If a line cord or power supply fails, the
second supply sources the complete power load. Optionally, a single power supply
and line cord may be installed if redundant power is not required. The second
power supply slot is physically covered in this configuration. The library may be
upgraded to redundant power at a later time.
The power supply output voltage tolerance is from 48.2 to 53.0 volts. The power
supply has an over voltage shut down set at 59 volts providing a 1 volt margin
below the maximum allowable UL low voltage limit of 60 volts.
Library power is controlled in two places. A switch on the rear of each power
supply shuts down power at the input of the individual power supplies. A front
panel power enable switch controls the power supply output for all CM and EM
power supplies. A library connected to AC line voltage will be in standby mode
with power supply ON but outputs turned OFF when the front panel power
enable switch is turned OFF. When the power enable switch is turned ON, the
power supply output and the library electronics power are ON. The Library
Control Blade (LCB) may turn the power system OFF using the PC interface.
Power Requirements
The tables below summarizes the library power requirements. Each library
modules uses a 350 watt power supply. Two 350 watt supplies are used when
redundant power is selected.
Table C-1. Control module (CM) power requirements
Item
Volts
Amps
DC Watts
AC Watts
Servo PCB
9.41
11.07
Accessor Motors
48
4*0.75
144
169.41
Door/Display
11.76
13.84
Drive Sleds -
2x50
100
117.65
Drive Sled 1x1
(10w)
20
23.5
LCB
47.06
55.36
© Copyright IBM Corp. 2005, 2010
C-1
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