Casio IT-2000W Technical Reference Manual page 29

Main Battery Voltage Monitoring
If the main battery voltage reaches LB1, the system issues a warning buzzer. If this warning buzzer
sounds, either start recharging the battery or replace it with a fully charged battery as soon as
possible. If one of these measures is not taken within ten minutes, the system will forcibly turn off
the power for safety. The following diagram shows the main battery voltage against the time axis.
Main
Battery
voltage
LB1
LB0
(a) If the main battery voltage reaches LB1, the low battery voltage warning alarm sounds.
(b) Unless the main battery is either replaced or recharged within ten minutes, the system power is
automatically turned off to protect the data.
(c) If the main battery voltage falls further and reaches LB0, the system automatically shuts off the
power to the main unit (critical suspend).
(d) If the main battery voltage drops below LB0, the main unit power cannot be turned on even if
the power switch is pressed.
(e) If the main unit is mounted on the I/O Box or connected to the AC adaptor, charging of the
battery is initiated and the main battery voltage will gradually increase.
(f) Once the main battery voltage has been recharged to an operable level, it is possible to turn on
the power to the main unit.
For information about the method used to replace the main battery refer to Chapter 2.2.6 "
How to Replace or Recharge Batteries".
Generate warning buzzer
(a)
(a) Turn the power OFF.
(b)
10 minutes
Voltage level to operate.
Start recharge.
(c)
Fig. 2.6
29
(e)
(d)
Time