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Troubleshooting: UPS Alarms
990-3015-001 Symmetra PX 160 kW 400 V Operation 23
Low Battery The UPS is in battery operation and
the battery charge is low.
No corrective action necessary.
Note: Runtime is limited. Shut down the
system and the load equipment or restore
incoming voltage.
No Batteries Detected No battery power is available. Option 1: Ensure the batteries are installed
properly.
Option 2: Check if the DC Breaker has
been tripped.
No Power Modules Detected No power modules are available. Option 1: Ensure that the power modules
are properly installed, the two fastening
screws are tight, and the locking latch is
engaged.
Option 2: Check for other communication
alarm messages.
Not Synchronized Fault System cannot synchronize to AC
line and bypass mode may not be
available.
Option 1: Decrease the sensitivity to input
frequency.
Option 2: Correct the input voltage to
provide acceptable voltage frequency.
Output Voltage Not In Range The output voltage is not within the
specified range.
Evaluate the threshold setting. If necessary,
adjust it for your situation. Contact APC
Customer Support.
Overload The load has exceeded the system
power capacity.
Option 1: Decrease the load.
Option 2: Add a power module to the
system.
Power Failure The input voltage is not acceptable
for normal operation.
Contact APC Customer Support.
Power Module Fault A power module has failed and
requires replacement.
See “How to remove a power module” on
page 17.
Redundancy Alarm Actual power module redundancy
has fallen below user-specified
redundancy alarm threshold. At least
one power module has failed or the
load has increased.
Option 1: If possible, install additional
power modules. See “How to install a
power module” on page 17.
Option 2: Replace failed modules. See
“How to replace a power distribution mod-
ule” on page 19.
Option 3: Reduce the load.
Option 4: Change alarm limit.
Redundancy Lost The UPS no longer detects
redundant power modules. One or
more power modules have failed, or
the load has increased.
Option 1: Install additional power
modules.
Option 2: Replace failed modules. See
“How to remove a power module” on
page 17.
Display Message Meaning Corrective Action