IAI America ASEL - Manual (Page 370)

Appendix
Battery Backup Function
348
Appendix
<Battery Replacement>
To replace the system-memory backup battery, disconnect the battery connector on the top face of the
controller, and change the battery in the battery holder with a new battery.
It is recommended that you set a replacement schedule and replace the battery regularly.
The battery must be replaced as soon as the controller’s battery voltage monitor function generates a
battery voltage low alarm.
After an alarm is detected, a battery error will occur in approx. 10 days at an ambient temperature of 20qC
if the power is supplied to the controller continuously. Once a battery error occurs, the data will be
physically lost in approx. four days.
If the controller is not operated, the above periods should be reduced to 80% at 20qC or to 25% at 40qC.
The controller is designed so that the data will not be lost for at least 30 minutes without a battery if the
controller is not detecting a battery error. Keep in mind to complete the battery replacement—taking out
the current battery from the battery holder and placing a new battery in the holder—within 30 minutes.
To prevent the risk of data loss, you can use the PC software to evacuate the data in the SRAM to the
flash ROM and then reload the flash ROM data to the SRAM after a new battery is installed.
The battery specifications are shown in the table below.
List of System-Memory Backup Battery Functions
Battery type AB-5 (by IAI)
Battery voltage 3.6 V
Current capacity 2000 mAH
Switching voltage at momentary
power failure
(Typical) 2.81 V (2.7 V a 2.93 V) System reset detection voltage
Power-source voltage drop at
backup
(Typical) 0.3 V
Detection voltage for battery
voltage low alarm
(Typical) 2.65 V r 5
Detection voltage for battery
voltage low error
(Typical) 2.37 V r 5
Time after alarm detection until
error detection (reference)
10 days at 20qC based on continuous operation; 8 days if the power is not
supplied.
10 days at 40qC based on continuous operation; 2.5 days if the power is not
supplied.
Minimum data retention voltage Min. 2.0 V (Varies depending on the SRAM characteristics.)
Time after error detection until
data loss (reference)
4 days at 20qC based on continuous operation; 3 days if the power is not
supplied.
4 days at 40qC based on continuous operation; 1 day if the power is not
supplied.
Data protection time during
battery replacement
30 minutes (Maximum retention
time when no battery is installed
in the battery holder)
Data is retained by the super capacitor
inside the controller.
Guide on when to replace
battery
Approx. 5 years