American Power Conversion 750VA - Manual (Page 15)

13
P ROBLEM AND P OSSIBLE
C AUSE
S OLUTION
UPS OPERATES ON BATTERY ALTHOUGH NORMAL LINE VOLTAGE EXISTS
UPS input circuit breaker tripped. Reduce the load on the UPS by unplugging equipment and resetting the
circuit breaker (on the back of UPS) by pressing the plunger in.
Very high, low, or distorted line
voltage. Inexpensive fuel powered
generators can distort the voltage. Move the UPS to a different outlet on a different circuit. Test the input
voltage with the utility voltage display (see below). If acceptable to the
connected equipment, reduce the UPS sensitivity.
B ATTERY C HARGE AND B ATTERY L OAD LED S FLASH SIMULTANEOUSLY
The internal temperature of the
UPS has exceeded the allowable
threshold for safe operation. Check that the room temperature is within the specified limits for opera-
tion.
Check that the UPS is properly installed allowing for adequate ventila-
tion.
Allow the UPS to cool down. Restart the UPS. If the problem continues
contact APC at,
www.apc.com/support .
D IAGNOSTIC U TILITY V OLTAGE F EATURE
Utility Voltage
The UPS has a diagnostic feature that displays the utility voltage. Plug
the UPS into the normal utility power.
Press and hold the button to view the utility voltage bar graph dis-
play. After a few seconds the five-LED, Battery Charge, , display on
the right of the front panel shows the utility input voltage.
Refer to the figure at left for the voltage reading (values are not listed on
the UPS).
The display indicates the voltage is between the displayed value on the
list and the next higher value.
Three LEDs light, indicating utility voltage within the normal range.
If no LEDs are lit and the UPS is plugged into a working utility power
outlet, the line voltage is extremely low.
If all five LEDs are lit, the line voltage is extremely high and should be
checked by an electrician.
The UPS starts a self-test as part of this procedure. The self-test does not affect the voltage display.