Specifications

RN: 5-90
RS3: Software Release Notes for P1 R4.2
Changes to RS3 Manuals
A System Power Supply Unit has about four times the power density of
AC/DC Power Supply assemblies. For example, if you needed a total of
2400 watts, two 1200-watt power supply modules would use about
one-fourth the mounting space required by four 600 -watt AC/DC Power
Supplies.
NOTE: Because of differing output voltages, AC/DC Power Supplies
cannot be mixed on a DC Distribution Bus with System Power Supply
Units. However, one power supply type may be used on Bus A and the
other used on Bus B in either of the redundant bus type configurations.
Description: The information under the heading “System Power Supply
Units” on pages 1-2-19 and 1-2-20 was changed to read as follows:
The RS3 Millennium Package (RMP) was designed to have a redundant
power supply without a battery backup. Therefore, it must have a
minimum of two power supply modules, where one module is a backup.
Each power supply m odule must be powered from an independent
mains supply circuit. An alternative to using an extra power supply
module is using the Bus B as a separate bus, redundant to the Bus A.
NOTE: If you supply r edundant power, you must ensure that the power
supply module outputs are diode isolated. Your power supply source(s)
must contain over-current protection. Each source must be individually
protected.
Non -redundant Bus Configuration
A standard, non-redundant, DC power distribution system consists of
one or more System Power Supply Units feeding one or more DC
Distribution Bus assemblies. F igure 1.2.7 shows a standard A/B Bus
operation.
Return Bus
Bus A
Bus B
DC Bus to DC Bus
Jumper
Bus A
Return Bus
Bus B
Bus A/B Power Supply Modules (up to 4)
+--+-- +-- +--
PS1PS2PS1PS2
System Power
Supply Unit 1
System Power
Supply Unit 2
Figure 1.2.7. Standard DC Power Distribution for System Power Supply Units