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Installation, Operation and Technical Manual
4. Installation
4.1 System Installation
The installation of an uninterruptible DC power system incorporating rectifiers, batteries
and control hardware requires compliance to National Wiring Standards, and appropriate
sections of standard IEC60950 to ensure safety of operators and supplementary
equipment. Wiring should always be done by qualified personnel.
4.1.1 Racks
The structure and continuity of the rack provide both system safety compliance and
additional shielding for electromagnetic compatibility (EMC) of the DC power system. The
rack enclosure needs to have the following features to provide safe and efficient system
operation:
The rack must form a basic fire enclosure. To do this, a rack needs a separator or base
plate, which prevents a burning liquid from escaping the enclosure when poured
vertically into the rack. This can be achieved by using either a baffle plate below the
rectifiers with a front finger grill that traps the liquid or a purpose made separation plate
that it mounted below the rectifier magazine to catch burning liquids.
Openings in the top and sides of the enclosure must comply with the following:
not exceed 5mm in any direction, or
not exceed 1mm in width regardless of length, or
for the top of the enclosure, be constructed that direct, vertical entry of falling
objects be prevented from reaching bare parts at HAZARDOUS voltage
(>32VAC or >60VDC), and/or,
for the sides of the enclosure, be provided with louvres that are shaped to deflect
outwards an externally falling object.
Construction of the rack is important in providing exhaust air venting. Cooling louvres,
vent holes or a rack with a 'top hat' construction are all good methods of obtaining good
ventilation while maintaining compliance with item ii) above.
The rack needs to be able to mount 19" rack equipment, have a depth not less than
400mm and a minimum height for enclosing the magazine.
4.1.2 Magazines
The magazine configuration metalwork and wiring are usually manufactured as a mini
shelf module with terminal blocks to accept AC wiring and DC output cables. These
magazines should be located in the rack to allow adequate cooling of rectifiers, noting that
the airflow is from the front to the rear of the magazine.
The magazines are held in the rack by M6 screws through the mounting flange and into
the rack mounting rail. All wiring is typically via rear access.
4.1.3 Lightning and Transient Suppression
The rectifiers and magazine contain basic transient suppression in the form of Metal Oxide
Varistors (MOVs) across line-to-neutral, line-to-earth and neutral-to-earth. These MOVs
are sized to provide protection from typical line transients in an industrial environment
according to ANSI C62.41-1991 (6kV/3kA) and IEC 61000-4-5 (Level X). Under these
158-1872-01
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Rectifier Technologies
19-Feb-14
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