OPTI-UPS 280ES User Manual page 21

280ES / 420ES / 650ES / 1000ES / 1400ES 17
2.4 Status Indication
Models 280ES / 420ES / 650ES: Front Panel LED' s
Normal Mode: When this LED is lit, the UPS is in
normal mode, and providing power to your equipment.
The output voltage will be equal to the input voltage.
The UPS will continue to filter and provide surge
protection.
Battery Mode: When this LED is lit, the UPS is
providing power from its battery.
Also, this LED is lit when you press the Test/Silence
Button to test the battery ( see Section 2.3). After the
UPS beeps twice, it will resume Normal Mode.
Battery Weak: When this LED is lit, the battery
voltage is low. This indicates that the battery either
needs to be recharged or replaced.
Overload: When this LED is lit, the UPS is
overloaded. You must remove the least critical
components connected to your UPS.