Alpha Technologies CFR 600, CFR 600XT, CFR 1000 - Manual (Page 28)

4.2 Using the Standard Interface Device
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4. OPERATION
Figure 10
Test LED and Output Load LED Indicators
UPS Powering Up
Whenever the CFR is powering up, the TEST LED flashes for a few
seconds. At the same time the OUTPUT LOAD indicator LEDs flash in a
chasing pattern to indicate that there is no output. As soon as the power up
sequence is completed, the TEST LED switches OFF and the OUTPUT
LOAD display LEDs show the percentage of the load.
Output Shutdown Pending
The TEST LED will flash to indicate that a UPS output shutdown is
pending to occur. When the operator gives an output shutdown command
(either via the RS-232 serial port or by the LAN Interface port), the UPS
delays the shutdown (for a programmable period) before actually switching
off the output.
Output Shutdown In Progress
The five OUTPUT LOAD LEDs will flash in a chasing pattern whenever
the CFR output is switched off by an output shutdown command (either via
the RS-232 serial port or by the LAN Interface port). This will also occur
when the unit is first powering up.