How to Connect an EPO Switch to the ATS
If you do not connect an EPO switch to the ATS, be sure to set the Arm/Test rocker on the ATS monitoring unit to Test.
Note
Overview
Connecting the switch. The Emergency Power Off (EPO) switch connects to the user interface board on the user connection plate. The user connection plate is located on the roof of the ATS. Connect an EPO switch to the user interface board (shown at right) using one of the following connections:
•Contact closure (Recommended!)
•24 VAC
•24 VDC
USER INTERFACE
© 2001 APC
MADE IN USA
1 | 2 | 3 | 4 |
| Contact Inputs |
| |
Contact Outputs
ATS 0 ATS 1 ATS 2
ATS EN
–+ 
EPO 24V EPO
AC/DC Contact
The terminal block on the user interface board accepts wire sizes from 12 to 30 AWG or 2.5 to 0.2 mm2.
Note
You can make this connection from inside the enclosure, or you can remove the user connection plate from the ATS to make the connection. A Phillips or standard screwdriver is needed to loosen the two captive screws. Use the knockout in this plate to route cables to the user interface board. If you decide to remove the plate, make sure not to disturb the existing connections.
Configuring and testing. The configuring and testing of the switch is performed through the EPO interface on the ATS monitoring unit. The figure on the right shows the monitoring unit and the location of the EPO LEDs and DIP switches.
TRIPPED
ARMED
885 |
USER / EPO C ONTACTS |
TOUPS |
Note
APC offers an optional InfraStruXure EPO System (EPW9). Contact your APC sales representative, or visit the APC Web site (www.apc.com) for more information.
EPO
TEST NC 
NO 
| LINK RX/TX |
|
|
N ETWORK | 10=G RN | 100= ORN |
|
RESET | STATUS | DISPLAY |
|
TRIPPED |
| ||
|
|
| POWER |
| ARMED |
|
|
EPO | TEST | ||
NC | |||
| NO |
|
|
InfraStruXure Power Generation System | 63 |
