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18 APC Redundant Switch: Installation and Operation Manual
Troubleshooting
Basic
troubleshooting
For computer interface port specifications, see the
APC
Web
site,
www.apc.com
.
Electrical
Hazard
Only trained APC technicians should open the
Redundant Switch for repair.
Problem Possible Cause Corrective Actions
The Redundant
Switch will not
turn on.
Very low utility
voltage, or no
utility voltage.
Use a lamp with an
incandescent bulb to test
the
AC
power supply to
the Redundant Switch. If
the bulb lights very dimly
or not at all, have the
utility voltage checked.
Ensure that the
AC
cables
are properly connected
between the Redundant
Switch and the
UPS
s.
The server
cannot
communicate
with the
attached
UPS
through the
Redundant
Switch
A cabling
problem or
internal
Redundant
Switch fault
Ensure that all cables
connections are securely
connected.
If there is still no
communication, connect
the server directly to a
UPS
. If you can establish
communication by this
direct connection, there
is an internal Redundant
Switch fault. Contact
APC
Customer Support.
All Redundant
Switch
LED
s
are flashing
An Internal,
automated self-
test failure
occurred; the
Redundant
Switch is
defective.
See “Obtaining service” on
page 25.