Omron S8BA-24D24D960SBF User Manual page 75

8 Troubleshooting
8-1 Troubleshooting
Perform the checks shown below if the unit is operating abnormally.
Problem
The unit does not start operation.
There is no LED display even
when the unit is connected to the
input power supply.
Backup is not possible.
The computer stops when a power
failure occurs.
Backup is performed too fre-
quently.
Frequent switching is performed
although a power failure does not
occur.
You hear the sound of switching.
The power is not turned ON even
when the unit is connected to the
input power supply.
The battery unit replacement dis-
play "[DC ON] LED: Green
(Steadily on) / [BATT] LED: Yellow
(Blink 2) / [ALERT] LED: Red (Blink
2)" appears.
The LED indicators show "[DC ON]
LED: Green (Steadily on) / [BATT]
LED: Yellow (Off, Steadily on, or
Blink 4) / [ALERT] LED: Red (Blink
0)".
The LED indicators show "[DC ON]
LED: Green (Off) / [BATT] LED:
Yellow (Off, Steadily on, or Blink 4)
/ [ALERT] LED: Red (Blink 0)".
8 - 2
Check and remedy
Make sure the AC input is securely connected to commercial power.
If the status indicator does not display properly after you perform the above
operation, there is a problem with the unit.
Refer to Concept of LED display on page 4-3.
The battery may not be fully charged.
Perform the test after charging the battery for at least 8 hours.
The battery charging operation starts when the battery is connected to the
input power supply. The battery is not charged when it is not connected to
the input power supply.
Variations (decrease) in the input power occur frequently. Or, noise may be
included that significantly distorts the voltage waveform of the input power.
• Make sure the voltage of the input power supply to which the unit is con-
nected is normal.
• The voltage may also drop when the cable used to connect the unit is
long or too thin.
Check the voltage value of the input power supply when the LED display is
"[DC ON] LED: Green (Blink 4) / [BATT] LED: Yellow (Off) / [ALERT] LED:
Red (Off)".
Battery life counter counted up to limit. The battery unit has been used up
to its end-of-life. Replace the battery unit.
Refer to "5-2-1 Notification that the battery needs to be replaced".
There are too many connected devices. Reduce the number of connected
devices until the LED display becomes "[DC ON] LED: Green (Steadily on)
/ [BATT] LED: Yellow (Off or Blink 4) / [ALERT] LED: Red (Off)".
Output stopped due to connections exceeding capacity limit. Turn OFF all
power to the unit and connected devices, and reduce the number of con-
nected devices. Then, turn the power to the unit and connected devices
back ON and check whether the LED display becomes "[DC ON] LED:
Green (Steadily on) / [BATT] LED: Yellow (Off or Blink 4) / [ALERT] LED:
Red (Off)".
S8BA-series Uninterruptible Power Supply (UPS) User's Manual (U726)