ABB Symphony Harmony Series Instructions Manual page 2

Preface
The Modular Power System III (MPSIII) supplies 5 VDC,
±15 VDC, 24 VDC, 48 VDC, and 125 VDC power to Harmony
Rack components of the Symphony Enterprise Management
and Control System. The power system is designed to operate
with 2N redundancy. This power system can operate with 120
VAC, 240 VAC, or 125 VDC input power.
This instruction provides specific hardware installation, trou-
bleshooting, maintenance, and replacement information nec-
essary for the MPSIII system. The information in this
instruction applies to MPSIII systems installed in ABB
cabinets.
This instruction can be used as a guide by system engineers. It
is not a tutorial and assumes the reader has a general knowl-
edge of installing and maintaining process control systems.
Some sections of this instruction have been prepared in proce-
dure format. There is a sequence flowchart that follows the
introduction to the section and any nonprocedural informa-
tion. This flowchart directs personnel to the appropriate proce-
dure located in the back of this instruction. By treating each
task as a separate entity, the procedures provide an easy
method for finding the information needed to perform each
task. The procedures can be removed and placed in separate
folders or notebooks, or carried to the job site.
The procedures have check boxes in the margin by each step.
When performing a procedure, check each box as each step is
completed. Some procedures have numbered warnings and /
or cautions under Safety Considerations. A triangle with a
warning or caution reference number appears in the margin by
the part of the procedure to which the warning or caution
applies.
Do not perform any procedures related to installation, mainte-
nance, or repair until reading and understanding this
instruction.
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