Eaton Cutler-Hammer ATVSKDA30300XSU, Инструкция по эксплуатации

Страница: 8 / 40

I.B. ATS-V003
Page 2
Effective 6/98
1.2.1 TRANSFER SWITCH TYPES
Four types of basic transfer switch equipment are avail-
able:
Automatic Transfer Switch
Automatic transfer switches automatically perform the
transfer function. They consist of three basic elements:
(1) Main contacts to connect and disconnect the load
to and from the source of power.
(2) Intelligence/supervisory circuits to constantly moni-
tor the condition of the power sources and thus pro-
vide the intelligence necessary for the switch and
related circuit operation.
(3) A transfer mechanism to effect the transfer of the
main contacts from source to source.
Basic Transfer Switch
The basic transfer switch is designed for use with cus-
tomer furnished controls. It is similar in design to the
automatic version except the intelligence circuit (logic
panel) and voltage selection panel are omitted. All auto-
matic sensing devices, relays or solid state devices are
the customer’s responsibility.
Non-Automatic Transfer Switch (Manually Operated)
Non-Automatic transfer switches provide the main con-
tacts and the transfer mechanism to effect the transfer
of the main contacts from source to source. Transfer of
power, however, is accomplished by true hand opera-
tion (not power assisted) of the transfer switch. This
switch is similar to the basic switch in that an intelli-
gence circuit and a motor driven mechanism are not
part of the design.
Non-Automatic Transfer Switch (Electrically
Operated)
This transfer switch is similar to the Non-Automatic
Transfer Switch (Manually Operated) just described
except that an electrical operation feature is added. The
switch electrically transfers power when an appropriate
pushbutton on the front of the enclosure is pushed. If
necessary, the switch can also be operated manually.
1.2.2 DESIGN CONFIGURATION
The Cutler-Hammer transfer switch is a rugged, compact
design utilizing molded case switches to effect the trans-
fer of essential loads from one power source to another
(Figures 1-2, 1-3 and 1-4). Molded case switches are
interlocked to prevent both switches from being closed at
the same time. The versatile design, in addition to stan-
dard transfer functions, offers an optional integral thermal
and short circuit protection in either or both switching
devices.
Molded case switches and the associated transfer
mechanism are usually mounted vertically in the assem-
bly. The vertical configuration (225-1000 amperes) is
accomplished by utilizing a positive, metallic transfer
and interlocking system between the molded case
switches. A horizontally mounted transfer mechanism is
utilized with transfer switches 30 to 150 amperes.
The Cutler-Hammer automatic transfer switch was
designed with installation ease and simplified mainte-
nance in mind. Three main panels comprise the auto-
matic transfer switch design:
• Power Panel
• Voltage Selection Panel
• Logic Panel
Each panel is independently mounted with interconnect-
ing wiring terminated in connector plugs to permit indi-
vidual door or panel removal without disturbing critical
connections. Enclosure mounting is simplified by utiliz-
ing top and bottom mounting flanges with elongated
mounting holes.
Figure 1-1 Typical Load Transfer Switch (circuit break-
er type) Schematic
Normal
Source
Emergency
Source
Load