Rockwell Automation 57C332 AutoMax Power Supply Module and Racks - Manual (Page 13)

2Ć5
2.2 Power Supply Module Electrical
Description
When the Power Supply module powersĆup, it executes a soft start,"
gradually increasing its output until it reaches the voltage necessary
for logic operations. At this time, the module generates an initialize
signal.
Should the AC input fall below the lower line voltage limit, the module
will generate a power fail interrupt signal at least three milliseconds
before loss of the regulated DC power to allow for orderly system
shutdown. The holdover time on loss of AC input is 20 milliseconds.
In the event of a power fail interrupt signal, 5 Volt output power is
supplied by the Battery BackĆUp (if installed, M/N 57C493 only) for
maintaining the volatile memory of DCS5000 Processor modules
and the Common Memory module. When the regulated output power
of the Power Supply module is restored to 4.85 Volts or greater,
power will be supplied by the Power Supply module. Note that
AutoMax Processors have onĆboard battery backĆup and do not
require Battery BackĆUp unless there is a Common Memory module
(M/N 57C413 or 57C413A only) in the rack.
If Battery BackĆUp Voltage ever drops below 3.0 Volts, or the cable
between the Battery BackĆUp and M/N 57C493 Power Supply
module is disconnected with the power off, memory will be lost and
the Processor modules will not function until the Power Supply is
manually reset by turning the keyswitch on the front panel from
MEMORY PROTECT to the PROGRAM position.
2.3 Rack Mechanical Description
The 6Ć, 10Ć, and 16ĆSlot Racks provide the mechanical means for
mounting the indicated number of DCS5000 and AutoMax modules,
as well as the Power Supply module. All Racks are designed for
panel mounting and include builtĆin high capacity cooling fans, an
AC line filter, a surge protector, and a cable management tray. See
figures 2.3, 2.4, and 2.5.