IAI America PSEL - Manual (Page 385)

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Appendix
2. Absolute Reset (Optional)
The simple absolute unit uses a secondary battery (nickel hydrogen battery) to retain the absolute counter
data and supply power to the encoder drive circuit when the power is cut off.
Be sure to charge the battery when the controller is started for first time following the delivery and also
after the battery has been replaced.
The battery is charged automatically when the power is supplied to the controller, so keep the controller
power supplied for at least 72 hours.
You can move the actuator or change the position table while the battery is charging.
Also charge the battery for at least 72 hours after the power has been cut off for a long period (but within
the specified data retention time).
* For the specified data retention time, refer to 2.2, “Setting the Piano Switches” in Chapter 4.
The battery is a consumable part. The initial characteristics of the battery will deteriorate after repeated
charges. If the data retention time has become significantly shorter, replace the battery.
As a guide, replace the battery approx. 3 years after connecting the controller for the first time, although
the specified timing of replacement varies depending on the surrounding air temperature, discharge
condition, etc.
A label showing the date three years after the shipping date is attached on the battery unit, so use this
date as a guide.