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80kW InfraStruXure PDU—Operation and Configuration 61
4. If the test was successful, place the Arm/Test rocker switch back to the Arm position. The
PDU display interface will clear the EPO test mode alarm. If the test was not successful, see the
troubleshooting chart:
5. Repeat this test for each EPO switch installed.
6. Ensure that the Arm/Test rocker switch is in the Arm position on the monitoring unit.
Safety warnings
Hazardous voltage from the branch circuit must be isolated from the 24VAC, 24VDC, and contact
closure. 24VAC and 24VDC are considered Class 2 circuits as defined in Article 725 of the National
Electrical Code (NFPA 70) and Section 16 of the Canadian Electrical Code (C22.1).
A Class 2 circuit is a source having limited voltage and energy capacity as follows:
a. If an Inherently Limited Power Source, voltage and energy are limited to less than 30VAC,
less than 30VDC, and 8A.
b. If not an Inherently Limited Power Source, voltage and energy are limited to less than
30VAC, less than 60VDC, 250VA, and the current is limited to 1000/Vmax. The fuse is
limited to 5A if less than 20VAC or 20VDC, or 100/V maximum if less than 30VAC or
60VDC.
Problem Action
Neither state LED was red
when the EPO switch was
engaged
• Check the wiring to your EPO switch
• Check to make sure the EPO DIP
switch configuration is correct for
your switch (NO or NC).
Only one of the state LEDs
was red when the EPO switch
was engaged
• Check to make sure the EPO DIP
switch configuration is correct for
your switch (NO or NC) and test
again.
• If the switch is configured correctly
and both LEDs are not red after testing
again, contact customer support at a
number on the back cover of this
manual.