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APC Redundant Switch: Installation and Operation Manual 19
Troubleshooting
Troubleshooting
communications
and lost
redundancy
With the high availability system, the attached
UPS
s are polled
continuously for capability to carry a load and ability to
communicate with the management software (PowerChute
plus
). When a problem with one of the
UPS
s occurs, power to
the load is not interrupted and polling continues, and
PowerChute
plus
responds by displaying the message, “Self
test failed: invalid test.”
Communications Problems.
If the message “Self test failed:
invalid test.” occurs repeatedly:
1. Check the communications path between the
UPS
s and
the Redundant Switch.
2. Check the front panel of the Redundant Switch.
– If the Status Select
LED
s are flashing in any sequence,
the Redundant Switch has failed. See “Basic
troubleshooting” on page 18.
– If the front panel appears normal, there may be a
UPS
or server communications problem, See the
troubleshooting and service sections of your
UPS
manuals.
– If you need more help, contact
APC
Worldwide
Customer Support.
Loss of Redundancy.
If the Redundant Switch
LED
for
UPS
-
B
is off,
UPS
-
B
has lost the ability to provide power to the
equipment load when engaged. If the
LED
for
UPS
-A is off,
UPS-A has failed, and power is now provided by
UPS
-
B
. See
the troubleshooting and service sections of your
UPS
manuals.
If PowerChute
plus
displays the message “self test failed:
invalid test” briefly or several times, the output voltage of
UPS
-
A
has dropped. Perform a
UPS
self-test through
PowerChute
plus
.
• If the self test fails, see the troubleshooting and service
sections of your
UPS
manuals.
• If you need more help, contact
APC
Worldwide
Customer Support.