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7. TROUBLESHOOTING
WARNING
Risk of
Electric Shock
. Do not open a UPS and attempt to repair it yourself. Personnel entering the
cabinet may be exposed to an electrical shock hazard that could result in death or injury or further
damage to the UPS or its electrical loads
Your UPS is equipped with extensive diagnostic capabilities. It will convey problems detected via
messages displayed on the LCD display. The bottom line of Display #1 or Display #2 will normally be
blank; however, if an abnormal condition exists, a message will be flashed indicating the problem. See
section 7.1 for detailed information concerning these messages.
The more serious problems will result in an alarm condition being annunciated. There are four levels of
alarms that the UPS will annunciate: Shutdown, Overload, Diagnostic, and Warning, with Shutdown
being the most serious and Warning being the least serious. If an alarm condition occurs, the LCD
display will automatically switch to a special screen displaying the type of alarm and the reason for the
alarm. See section 7.2 for detailed information concerning alarm annunciations.
If a problem exists long enough, the UPS may eventually have to shut down its output. If this occurs,
the controls of the UPS will remain on, but in a state of inactivity for up to 2 hours. At the end of this 2
hour period, the UPS will trip off its INPUT AC BREAKER and MAIN BATTERY BREAKER. These
actions will totally shut down the UPS and protect the batteries from being deep discharged. If you find
your UPS in this condition, with both breakers in the tripped position, it most likely tripped the breakers
off in this manner. A breaker that is in the tripped position is one whose handle is in an intermediate
position between ON and OFF. An attempt to push the handle up to the ON position will fail, as the
handle will not stay in the ON position. To reset the breaker, the handle must be pulled down to the
OFF position, then pushed up to the ON position.
In such situations where the UPS has totally shut itself down, the information causing the shutdown is
saved in a battery-backed-up historical data base within the UPS. This information along with Overload
and AC line problem conditions are stored in this database, and can be retrieved and viewed on the
LCD display at anytime. Even if the UPS is totally shut down, this information is not lost as it is
preserved by a small lithium battery located within the storage element on the control board. See
section 7.3 for detailed information concerning the historical database.
To restart a UPS that has shut down abnormally, some precautions should be taken to protect the load
from powering up and then shutting back down due to the same problem reoccurring. The reason for
the shutdown should be viewed on the shutdown alarm display if the UPS has not totally shut down; or
the History display if the UPS has totally shut down. Before resetting tripped breakers, rotate the
Transfer Switch counter-clockwise from the ON UPS to the OFF IDLE position so the UPS will not
immediately attempt to start producing an output that it may not be able to maintain. If the shutdown
reason appears to be due to a problem external to the UPS, such as an overload on one or more of the
load phases or a utility failure, repair the external problem and restart the UPS. It may be advisable to
turn off all loads connected to the UPS in the event that the UPS’ batteries are depleted, and wait a
short period of time (several minutes) until the batteries reach some level of charge, before turning on
the loads.
If the UPS shutdown appears to have been caused by an internal problem, call for service. Do not
attempt to turn the Transfer Switch to the ON UPS position with loads attached. Doing so may result in
the load being powered for a short time, then being shut down. This may cause damage to your load
equipment. If you turn off all loads connected to the UPS, you may try the ON UPS position to see if the
problem reoccurs. If not, you may then start turning on your loads. If you need to start your loads
