Specifications

Automatic Transfer Switch with Power Distribution 63
How to Connect an EPO Switch to the ATS
Overview
Connecting the switch. The Emergency Power Off
(EPO) switch connects to the ATS user connection plate.
The figure on page 11 shows the location of the user
connection plate on the roof of the ATS. Connect a
switch to the user interface circuit board (shown at right)
using one of three following connections:
• Contact closure (Recommended!)
•24VAC
• 24VDC
You can make connections from inside the enclosure, or you can
remove the user connection plate and make your connections.
Remove the plate using a Phillips or standard screw driver to
loosen the two captive screws. Use the knockout in the plate to
route cables to and from the user connections on the plate. If you
remove the plate, make sure that you do not disturb the existing
connections.
Configuring and testing. Configuring and testing of the switch
is done through the EPO interface on the ATS monitoring unit.
The figure to the right shows the ATS monitoring unit and the
location of the EPO LEDs and DIP switches.
Note
If you do not connect an EPO switch to the ATS, make sure to set the ATS Arm/Test
rocker on the ATS monitoring unit to Test.
Note
The terminal block on the user connection plate accepts
wire sizes from 12 to 30 AWG or 2.5 to 0.2 mm
2
.
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.
1 234
ATS EN
ATS 0
ATS 1
ATS 2
EPO
Contact
–
+
EPO 24V
AC/DC
Contact Inputs
Contact Outputs
USER INTERFACE
© 2001 APC
MADE IN USA
NO NC
USER / EPO CONTACTSTO UPS
DIS PL AY
10=G RN
100=ORN
NETWORK
POWER
RS-232
CONSOLE PORT
9600-8-N-1
RESE T
TRIPPED
STATUS
LINK RX/TX
ARMED
TEST
EPO
885-22 88
12345678910111213
25 24 23 22 21 20 19 18 17 16 15 14
NO
NC
TRIPPED
ARMED
TEST
EPO