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Conditions
Possible cause
Power overload
Power requirements exceed the
UPS capacity (greater than 100%
of nominal; see "UPS
specifications" on page 61 for
specific output overload ranges).
LED is On.
Beep continuous.
UPS overtemperature
The UPS internal fan has failed.
LED is On.
1 beep every 3
seconds.
At the warning level,
the UPS generates the
alarm but remains in
the current operating
state.
If the temperature
rises another 10°C,
the UPS transfers to
Bypass mode or shuts
down if Bypass is
unusable.
The UPS does not
A utility power failure has
start.
occurred, an upstream circuit
breaker is tripped, or the input
power cord (if so wired) is
unplugged.
The Remote Power Off (RPO)
switch is active or the RPO
connector is missing.
Input/Output cables are not
Input wiring bad /
connected to the correct terminal
Output wiring bad
blocks.
LED is On.
Beep continuous.
Action
Remove some of the equipment
from the UPS.
The UPS continues to operate,
but it might switch to Bypass
mode or shut down if the load
increases.
The alarm resets when the
condition becomes inactive.
If the UPS transferred to Bypass
mode, the UPS will return to
normal operation when the
temperature drops 5°C below the
warning level.
If the condition persists, shut
down the UPS.
Clear vents and remove any heat
sources. Allow the UPS to cool.
Ensure the airflow around the
UPS is not restricted. Restart the
UPS.
If the condition continues to
persist, contact your service
representative.
Check utility power, circuit
breakers, and input connections.
If the UPS Status menu displays
the "Remote Power Off" notice,
inactivate the RPO input.
Check wiring connections and
ensure that all Input/Output
cables are connected correctly --
for example, neutral-to-neutral
and ground-to-ground.
Chapter 8. Troubleshooting
57
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