Spectra Logic Spectra T950V User Manual page 36

Chapter 1 — Library Overview
Component
5/12 VDC Power
Supply Modules
Power Control
Module (PCM)
August 2019
Description
The 5/12 VDC power supply modules convert AC input to provide the 5 VDC
and 12 VDC power used by the drives in the frame. In the main frame, these
power supplies also provide power to the controller bays, the LCM, the RCM,
and the LCD operator panel. With the exception of its voltage rating, the 
5/12 VDC power supply module closely resembles the 24 VDC robotics power
supply module shown on page 35.
A minimum of one power supply per populated DBA is required. Installing an
optional N+1 power supply, where N is the number of DBAs with one or more
installed drives, provides redundancy and failover protection in the event that
a single power supply fails. See Redundant Power Supplies on page 70 for
additional information.
Each power supply module has two indicator LEDs, one for AC power status
and one for DC power status. The color of the LED indicates the status.
 Green — T he power is on and functioning normally.
 Orange — T he power supply has a fault condition.
 Off — T he power is not on or the power supply module is not functioning
normally.
Note: Any bays that do not have power supply modules installed must have
covers installed to maintain proper air circulation throughout the frame.
DC power
status
AC power
status
Figure 5 The 5/12 VDC power supply modules and the PCM.
The PCM supplies power to the power supplies when you press the power
button on the front panel of the main frame. It monitors the power supply
modules in the frame for output voltage, output current, power supply fan
operational status, and power supply operational temperature. The PCM uses
the voltage and current data to calculate the library power usage that is
displayed through the BlueScale user interface.
Power supply modules
User Guide—Spectra T950V Library
Library Features
Power Control
Module (PCM)
36