Eaton ATC-900 Operation And Maintenance Manual - page 13
IB140064EN
For more information visit: www.eaton.com
Instructional Booklet
Effective: April 2018
Page 13
Operation and Maintenance Manual, Automatic Transfer Switch, Bypass Isolation,
Contactor Type, Open/Closed Transition, ATC-900 Controller, 3000A Frame
Figure 15. Ground Bar.
3.6 Features/Options
3.6.1 Some Popular Features for the Automatic Transfer Switch
A variety of standard and optional features are available for Eaton
ATSs. All features or combinations of features may not be avail-
able on specific ATSs. All features and/or accessories are Under-
writers Laboratories (UL) listed unless noted. The primary function
of the controller is to accurately monitor power sources and pro-
vide the necessary intelligence to operate a transfer switch in an
appropriate and timely manner. In addition, the controllers pro-
vides useful present and historical data, reliable two-way commu-
nications, and programming through the device’s faceplate or
communications option.
3.6.1.1 Standard Features
There are a several standard features of the ATC-900 Controller.
All features are activated to the user except three items: 1) closed
transition, 2) I/O Module(s), and the DCT module. Please see the
specific controller Instruction booklet for the many standard fea-
tures available. A variety of programmable features are available
to meet a wide variety of application requirements. Individual fea-
tures or feature combinations provide the intelligence required to
tailor switches to individual needs. The specific variable setpoints
associated with standard and factory activated features are stored
in a nonvolatile memory and feature setpoints are available for
customer adjustments. The USB can be used to download/upload
setpoints, and download events.
3.7 Enclosure
The rugged steel switch enclosure is supplied with hinges to
insure proper support of the doors and door mounted devices.
The hinges have removable hinge pins to facilitate door removal
and all doors contain connectors for easy electrical reconnect. The
doors are supplied as standard with padlock latches. Cable entry
holes are the customer’s responsibility. The right-side slider door
is used to mount a variety of lights, switches, and push buttons,
depending upon the options required for a particular switch. The
switch enclosures and some internal steel mounting plates, such
as the transformer panel mounting plate, go through a pre-treat-
ment cleaning system prior to painting to insure a durable finish.
Should the enclosure become scratched and in need of touch up
paint, use ANSI 61. All remaining steel is galvanized. The standard
switch enclosure is NEMA Type 1 for general indoor use.
There are many other options for these switches such as meter-
ing, Remote Annunciator Control (RAC), ATS-Monitor, Gateways,
and Surge devices. Please consult factory for more features and
options.
3.8 Standards
Eaton transfer switch equipment is listed for application by UL and
CSA. In addition, Eaton Automatic Transfer Switches are listed
under Standard UL 1008. This standard covers requirements for
Automatic Transfer Switches intended for use in ordinary loca-
tions to provide for lighting and power as follows:
a. In emergency systems, in accordance with articles 517 and
700 in the National Electrical Code (NEC), American National
Standards Institute/National Fire Protection Association
(ANSI/NFPA) 70 and the NFPA No. 76A and/or
b. In stand-by systems, in accordance with article 702 of the
NEC and/or
c. In legally required stand-by systems in accordance with article
701 of the NEC.
d. In Critical Operations Power Systems (COPS) per article 708 of
the NEC.
Eaton Automatic Transfer Switches are available to meet NFPA
110 for emergency and stand-by power systems, and NFPA 99
for health care facilities when ordered with the appropriate
options.
3.9 Power Off Buffer
For faster switching times when power is removed from the
switch, there is a non-maintenance buffer added that keeps power
onto the Logic Controller, not the ATC, for about 30 seconds.
The additional time that the Logic Controller unit is powered pre-
vents it from having to reset when the normal source fails. It is a
small device and and is located on the slider door panel.
The buffer is din-rail mounted and is factory set (22-24Volts) with
no maintenance required. The green LED on the Buffer will flash
when the unit is being discharge or charged, otherwise it will
remain on. Since this transfer switch has a buffer, the DCT mod-
ule could be used with the buffer to keep the controller powered
for about 20 seconds (to keep communications active); which is
more than enough time to ride through a power outage.
Ground