Operator`s manual

4.2 Using the Standard Interface Device, continued
Low Battery Warning
The red “LOW BATTERY WARNING” LED precedes “LOW BATTERY SHUT-
DOWN” by 2 to 5 minutes and indicates that the batteries can no longer support the
load. Immediate steps should be taken to begin an orderly system shutdown. From
LOW BATTERY WARNING, it may take several hours to fully recharge the batteries.
Fig. 23
Low Battery Shutdown
The “LOW BATTERY SHUTDOWN” LED indicates that the UPS has shut itself
down to prevent over-discharge damage to the batteries. In critical applications, an
additional power source (such as a generator) should be used until utility line power
returns.
Fig. 24
Test
The yellow “TEST” LED indicates that the UPS is simulating a LINE FAILURE to
self-test the backup capabilities of the unit. If, during the one minute test, the UPS fails
to supply backup power, it resumes LINE PRESENT operation without interruption to
the load and lights the “SERVICE” LED.
Fig. 25
Service
The “SERVICE” LED indicates that the UPS is no longer able to provide backup
power to the load and that service is required. Consult the manual's troubleshooting
section or contact your authorized Alpha service center.
31
Fig. 26
4. OPERATION
5.2 RS-232 Menu Selection Icons
Icons have been placed throughout this section to easily guide you to key
commands using remote terminal emulation. The icons provide short cuts to desired
display screens without having to step through various menus. To use the icons,
simply enter the number contained in the icon screen while you are in the terminal
emulation mode. A dark screen icon with white numbers accesses one of the 7 main
menus. A light screen icon with black numbers directly accesses the chosen sub-
menu function.
5. RS-232 TERMINAL COMMUNICATION
34
Fig. 31
PC Communication Icons (used in this manual)
5
55
The dark screen icon with white lettering accesses
one of the main menus. In this example, the #5
(USER PARAMETERS) will appear.
The light screen icon with black lettering directly
accesses a sub-menu. In this example, the #55
(SET TEST FREQUENCY) will appear.
This function is not independently selectable as a
sub-menu item. It is included as part of the USER
PARAMETERS main screen selection.