Introduction; Description; Power Chassis - ABB Symphony Harmony Series Instructions Manual

Description and Operation

Introduction

Description

Power Chassis

WBPEEUI210509A1
The MPSIII system supplies 5 VDC, 15 VDC, -15VDC, 24VDC,
48 VDC, and 125 VDC power to Harmony rack components of
the Symphony control system. The MPSIII system can also be
used to power INFI 90 OPEN system components.
The MPSIII system is designed to entirely replace the MPSII
system used in Harmony Rack systems. Components of the
MPSII and the MPSIII system are not interchangeable. The
MPSIII system fits in the same cabinet space as the MPSII sys-
tem, but some cabinet arrangements and types may require
that additional mounting provisions be used.
NOTE: The MPSIII system has provisions for a supplemental rear door
mounted fan for proper cooling. Cabinets using the MPSII system may not
have had this fan.
The MPSIII system consists of a power chassis, PEP, fan
assembly, DC bus monitoring assembly, and power supply
trays. Figure 2-1 shows the system architecture of the MPSIII
system.
At the right side of the Figure 2-1, the 5 VDC, 15 VDC, and
-15 VDC lines shown entering the system power bus bar are
the operating voltages for the rack devices. MCOM (module
common) is the return line for these voltages. The 25.5 VDC
line shown entering the system power bus bar is I/O power for
field devices and I/O COM is its return line.
The physical arrangement of the MPSIII system components is
shown in Figure 2-2.
The power chassis provides mounting slots for two redundant
power supply trays, cooling fans, power output terminals, a
DIN rail for the DC bus monitoring assembly, and a status
Section 2
2 - 1