IB140012EN
For more information visit: www.eaton.com
Instructional Booklet
Effective: March 2021
Page
23
Operation and Maintenance Manual,
Automatic Transfer Switch Controller, ATC-900
5.5 Programming I/Os
The ATC-900 has four inputs and four outputs that are program-
mable I/Os. The outputs are Form C types and easily assessable.
Depending on the switch types, the I/Os are wired out to the ter-
minal blocks that are easily assessable. If they are not wired out
to terminal blocks, the controller will contain the necessary plugs
to tap into easily. The terminal blocks also have engine start (Gen
Start) and S1/S2 availability wired. If more I/Os are required, the
use of an I/O module is required as shown in Section 2.5.2. Up to
four I/O modules can be used which will give 20 programmable
I/O. In most cases, the controller itself or the controller with one I/
O module should be enough. The I/O module can also be added on
in the field if the application calls out for more I/Os.
The following are the programmable Inputs and Outputs of the
controller. See Appendix B for a description of the available I/Os.
Programmable Inputs
•
Remote Engine Test
•
Bypass Timers
•
Preferred Source Selector
•
Go to Emergency (S2)
•
ATS on Bypass
•
Manual Retransfer
•
Enable Manual Retransfer
•
Load Shed - S2 Inhibit
•
Go to Neutral Position (not SE Rated)
•
Lockout
•
Monitor Mode (NC or NO)
•
Secondary Input
•
Disable (Default settings)
•
Bypass Safety Interlock Transfer Inhibited Fault Alarm
•
Closed Transition Inhibit
•
Engine Test Mode Select
Programmable Outputs (Form C)
•
Normal (S1) Source Available
•
Emergency (S2) Source Available
•
Normal (S1) Source Position
•
Emergency (S2) Source Position
•
Pretransfer Signal Contacts 1
•
Post Transfer Signal Contacts 1
•
Pre/Post Transfer Signal
•
Load Sequencing Contacts (1)
•
Load Sequencing Contacts (2)
•
Load Sequencing Contacts (3)
•
Load Sequencing Contacts (4)
•
Load Sequencing Contacts (5)
•
Load Sequencing Contacts (6)
•
Load Sequencing Contacts (7)
•
Load Sequencing Contacts (8)
•
Load Sequencing Contacts (9)
•
Load Sequencing Contacts (10)
•
Selective Load Shed
•
General Alarm Indication Contact
•
Monitor Mode
•
ATS in Test
•
Engine Test Aborted
•
Cooldown in Process
•
Engine Start Contact Status (Gen 1 & 2)
•
LOAD SHED - Emergency Inhibit On
•
ATS on Bypass
•
Load Bank Control
•
Remote I/O (Controllable by Modbus)
•
Health
•
Disable (Default Settings)
•
Waiting for Sync
* See descirptions of each I/O in Appendix B
Note:
S2 Permit (Input), S2 Request (Output), and TDNF (Timer)
are used on a private switch, please see switch instruction book-
let for information
Outputs (Alarms & Warnings)
Appendix A: Feature Timer List and Status Display Messages
in
the status area at the end of the manual describes the Yellow and
Red banners on the ATC-900. Any flashing red banners will ener-
gize the programmable output general alarm indication contact.
Each I/O module uses a CAT V straight cable or better, and are
strung together to the ATC-900's J11 connector.
Table 8 shows most of the ATC-900's features and the program-
mability of each. There are five categories:
•
P Programmable
•
PF Programmable Fixed I/O
•
O Optional
•
OF Optional Fixed
•
S Standard
In some applications, a certain I/O will be fixed (PF) from the fac-
tory and the user will not be able to change the location of the
I/O. An example of this is for Service Entrance. Service Entrance
requires the “Go to Neutral” (option 37) input. This is a function
of the switch so the user will not be able to change which input
"Go to Neutral" is set to on the ATC-900.
For the Optional Fixed, an example would be for a Preferred
Source Selector (10C), which is an external two position switch
that allows the user to select the preferred source. Anything with
an external switch on the door will require that particular I/O to be
fixed. When any of the I/O is fixed, the color will be black (instead
of Blue) and it will also show up in the System Info Menu screen.
There are some options that will require an I/O module due to a
large number of fixed I/O required. There could be several I/Os
that are associated with an option i.e. Load Sequencing Contacts.
Some programmed input examples are shown below. These can
be easily change by the user.
#1 Input
Lockout
81J
#2 Input
Go to Neutral (Isolated)
37
#3 Input
S2 Inhibit (Load Shed)
36
#4 Input
Go to S2
26D