You may hear a buzzing sound or see sparks when installing the
fuse. This is normal and will not damage the UPS.
2. Turn on the Line power.
3. Ensure the LEDs operate (see LED Descriptions in Table 11.
When power is first applied, both LEDs light up and then only the
green light remains on if the UPS is in Line mode.
Installation and Powering On Finished
This section provides information on the various LED lights and
troubleshooting the UPS.
LED
Description
Green OFF
The UPS's inverter is turned off. Line power goes
straight to the load.
Green ON
The UPS is turned on. Line power is provided to the
load.
Green Flashing
The UPS's inverter is on. Backup battery power is
provided to the load.
Red ON or Flashing
The UPS has a malfunction. See the following
troubleshooting table.
Table 11 – UPS LED Descriptions
Symptom
Check the following....
No Output Power
l
Is utility power connected?
l
Is the battery fuse installed?
l
Are the batteries discharged?
l
Is the input circuit breaker open?
No Battery Backup Power
l
Is the battery fuse connected or is it
blown?
l
Are the batteries discharged?
No Power to Load
l
Is the UPS's output properly connected
to the load?
Table 12 – UPS Troubleshooting
62
R450 Data Collector Installation and Maintenance Guide
Chapter 4: I Uninterruptible Power Supply
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