The UPS uses the energy stored in the batteries: see chapter 7 'Batteries - autonomy'.
The UPS will shutdown
after the batteries have been discharged (automatic restart), or
if keypad 'OFF' is pressed for >2 seconds (manual restart required) or
if a 'UPS shutdown' command is given by the computer (automatic restart).
Battery low (end of autonomy)
The batteries are nearly discharged. Controlled shutdown of your computer equipment should be
completed within 1 minute.
The battery is bad. Perform the self test again (see 3.3.7) to confirm the 'replace battery'
condition. The alarm only goes out after the next self test: if the battery has either been
sufficiently charged (discharged battery) or replaced by a new one (worn out battery). See also
Overload on mains/battery
The demanded power of the equipment exceeds the UPS's rated output power. If the load
exceeds 150% of the rated power:
during battery operation, the UPS output will be switched off immediately
during mains operation, the UPS output will be switched off after 30 seconds.
The self test can be started manually: when the UPS operates in mains mode press the 'ON'
button for 2 seconds. During the test the unit will switch to battery operation for 6 seconds to
check the battery condition. After 6 seconds the unit will switch back to normal operation: mains
mode. See also 3.2.2.
The RS232 port is a plug-in interface port (4-pin, RJ-11, 4P-4C) which enables advanced communication
between the UPS and the computer. Use UPS software for unattended operation of workstations, power
quality related data logging, shutdown notification and control, auto-restart, diagnostics, and battery
We strongly recommend using only original GE Digital Energy™ software in combination with the
RS232 interface port.
For specific information on GE Digital Energy's connectivity products please contact your local dealer or
The communication port is available as long as the UPS is ON.
4 - Communication
GE Digital Energy
DE ML Series: user manual 1.1 (GB)