ABB MNS-MCC, Инструкция по установке, эксплуатации и обслуживанию

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26
M N S - MCC
LO W VO LTAG E M OTO R CO N T R O L C EN T ER
Finally replace the transparent barrier(s).
Note:
The holes at the ends of all bus bars
ensure adequate adjustment within the
required tolerances (±20 mils [0.5 mm]
in any direction). If the lineup has been
installed properly, the bus bars in adjacent
sections will line up. Never drill or modify
bus bars if alignment is poor. Ensure that
the adjacent sections are properly and
completely connected together
mechanically before connecting the
horizontal bus splices.
Do not clean the contact surfaces on a new MCC.
For connections to existing MCCs with heavy
oxidation, you may need to clean the contact
surfaces by sanding lightly with a fine grain
aluminum oxide paper.
Splicing ground bus bar
The horizontal ground bus must be spliced
between adjacent sections. Splice links are also
provided on the right-hand side of each shipping
section and may be loosened and bridged to the
adjacent section.
The ground bus bar is designed to use one single
bar across the sections or the shipping pallet, this
bus bar can be placed on the bottom of the units,
or on the top of the units.
Loosen the bolts holding the ground splice link(s) in
place and slide the link(s) to the right to straddle
the ground bus in the adjacent (right-hand) section.
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37
—
39
—
40
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38
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37 Bus bar connections
—
38 Ground bus bar
connections
—
39 Ground bus
bar splice link
—
40 Slide the link to join
with the next section