Name And Function Of Parts - NEC 500 UPS User Manual

5. Name and Function of Parts

1) Front View
With the UPS plugged in, press and release the large upper on/test button to supply power to the loads. The loads are
immediately powered while the UPS beeps and performs a self-test.
Press and release the small, lower off button to turn off power to the loads. It may be convenient to use the UPS as a master
on/off switch for the protected equipment.
Note: Whenever the UPS is plugged in and utility voltage is present, the charger maintains battery charge
The on-line LED illuminates when the UPS is supplying utility power to the loads.
Self-test
The UPS performs a self-test automatically when turned on, and every two weeks thereafter (by default). Automatic self-test
eases maintenance requirements by eliminating the need for periodic manual self-tests.
During the self-test, the UPS briefly operates the loads on-battery. If the UPS passes the self-test, it returns to on-line operation.
If the UPS fails the self-test it immediately returns to on-line operation and lights the replace battery LED.
The loads are not affected by a failed test. Recharge the battery overnight and perform the self-test again. If the replace battery
LED is still on, replace the battery using the Replacing the Battery procedure.
SmartTrim
The SmartTrim LED comes on to indicate that the UPS is compensating for a high voltage.
SmartBoost
The SmartBoost LED comes on to indicate that the UPS is compensating for a low voltage
Overload
When the UPS is overloaded (when the connected loads exceed the maximum specified in the "maximum load" section under
Specifications), the overload LED comes on and the UPS emits a sustained tone. The alarm remains on until the overload is
removed. Disconnect nonessential load equipment from the UPS to eliminate the overload.
On Battery
During on-battery operation, the on-battery LED illuminates and the UPS sounds an audible alarm consisting of four beeps every
30 seconds. The alarm stops when the UPS returns to on-line operation.
Low Battery
When the UPS is operating on-battery and the energy reserve of the battery runs low, the UPS beeps continuously until the UPS
shuts down from battery exhaustion or returns to on-line operation.
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