Eaton Cutler-Hammer ATVSKDA30300XSU, Инструкция по эксплуатации

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I.B. ATS-V003
Page 22
Effective 6/98
SECTION 5: OPERATION
5.1 GENERAL
A transfer switch provides main contacts to connect and
disconnect the load to and from the normal and emer-
gency power sources (Paragraph 3.2.2). A transfer mech-
anism provides the mechanical motion required to open
and close the mechanically interlocked main contacts
(Paragraphs 3.2.3, 3.2.4 and Figure 3-3).
Three distinct switch positions are provided:
• Normal - The contacts associated with the normal
power source are closed and the emergency power
source contacts are open.
• Neutral - The contacts associated with both the nor-
mal power source and emergency power source are
open. This position allows for load circuit mainte-
nance.
• Emergency - The contacts associated with the nor-
mal power source are open and the emergency power
source contacts are closed.
5.2 VERTICAL DESIGN OPERATION
The vertical design transfer switch utilizes a mechanical
mechanism with a manual operating handle (Figure 4-
4). The manual operating handle can be used to create
the rotational motion required to open and close the
main contacts through a rigid mechanical interlocking
system (Figure 5-1). An indicator wheel attached to the
operating handle and mechanical interlocking system
rotates with each movement of the handle to open
and/or close the main contacts (Figure 5-2). The three
switch positions (Normal, Neutral and Emergency) are
visually indicated on the indicator wheel (Figure 5-3).
To manually operate the transfer switch, the operating
handle is ratcheted until the desired switch position is
indicated on the indicator wheel. The operating handle
is always electrically “dead,” and the indicator wheel
free-wheels should a particular switch be capable of
electrical operation through the use of a motor. This fea-
ture ensures no operator problems should the switch
automatically operate while the manual handle is being
used.
Figure 5-1 Transfer Switch Manual Operating Handle in
Use on Vertical Design Figure 5-2 Indicator Wheel Shown Mounted in
Mechanism with Motor Mounted Under Wheel