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I.B. ATS-AG03
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). Each transfer
mechanism provides the mechanical motion required to
open and close the mechanically interlocked main con-
tacts (Paragraph 3.2.3).
Note that the transfer mechanisms for the two types of
ATS described in this booklet (30-200A and 300-600A)
are different for both the manual and automatic modes.
NOTICE
If a transfer switch with any type of electrical operat-
ing capabilities is to be operated utilizing the manu-
al operating handle, it is strongly recommended that
the transfer motor circuit first be isolated. This is
accomplished by unplugging the (P3) plug marked
motor disconnect (Figure 1-2). Any attempt to oper-
ate the manual handle without first isolating the
motor circuit causes an automatic transfer.
5.2 MANUAL OPERATION (300-600A)
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 operat-
ing handle and mechanical interlocking system rotates
with each movement of the handle to open and/or close
the main contacts (Figures 5-2). Three distinct switch
positions are provided and indicated visually on the indi-
cator wheel (Figure 5-3). The three distinct switch posi-
tions or contact conditions are:
• 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.
Effective 7/00
Figure 5-1 Transfer Switch Manual Operating Handle in
Use (300-600A Models)
Figure 5-2 Indicator Wheel Mounted in the Switch with
Motor Under the Wheel (300-600A Models)
Page 17
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