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48
Troubleshooting
Problem Possible Cause Solution
No output AC input and output circuit
breakers are off
Turn on input and output
circuit breakers
No line power input Turn on AC input breaker
Red LED illuminates solid
on front panel, indicating
fault
Read fault event under Event
Log in LCD display. Manually
restart UPS. Contact Tripp Lite
if fault persists.
Output LED is off Line power or battery
power is not available
Apply qualified input power
and make sure battery and
input breakers are turned on
UPS fault Contact Tripp Lite for repair
information
UPS does not transfer to
battery mode during a
power failure or backup
time is shorter than
expected
Battery is not connected Connect batteries
(48V or 24V DC nominal)
Battery circuit breaker is off Turn on battery breaker
Battery is not fully charged Recharge the battery and
then test discharge time
Dead battery Replace with new batteries
UPS fault Return to repair center
Alarm LED is lit Abnormal conditions are
detected
Solve the problem according
to alarm information
Batteries will not charge Battery circuit is open 1. Check if the battery cable
is connected firmly and make
sure battery connection
is correct. If there is any
connection error, loosening or
opening the connection will
cause the circuit to open.
2. Check if proper battery
voltage is detected on the
UPS battery connector.
3. Check if the battery
breaker is closed.
4. If the battery is bad,
replace it.
Wrong or bad temperature
probe connected
Only use a factory-supplied
temperature probe reading
approximately 15,000 Ohms
@ 25°C (77°F)
LCD text is not readable UPS fault Return to repair center
Password access is not
available
Password is lost or
forgotten
Contact Tripp Lite for resetting
the new password
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