IAI America XSEL-QX - Manual (Page 444)

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Appendix
To replace the system-memory backup battery, open the panel window on the front side of the controller
and replace the coin battery in the battery holder.
It is recommended that the battery be replaced regularly in accordance with the frequency/duration of
controller usage.
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 a surrounding air temperature of
20
qC 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 at all, the above periods should be reduced to 80% at 20
qC or to 25% at
40 qC.
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. Remember to complete the battery replacement within 30
minutes.
To prevent 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
CR2032 (Note)
Battery voltage 3 V
Current capacity 220 mAH
Switching voltage at momentary
power failure (Typical) 2.81 V (2.7 V to 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 20 qC based on continuous operation; 8 days if the power is
not supplied at all.
10 days at 40
qC based on continuous operation; 2.5 days if the power
is not supplied at all.
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 20 qC based on continuous operation; 3 days if the power is
not supplied at all.
4 days at 40
qC based on continuous operation; 1 day if the power is
not supplied at all.
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.
Temperature 40 qC, power ON
time 0%
1.5 years
Guide on when to replace battery
Temperature 40 qC, power ON
time 50%
3 years
(Note): CR2032 is a standardized product and can be used with products by any manufacture.