IAI America REXT - Manual (Page 249)


Part 1 Specification
Chapter 5 Simple
Absolute R Unit

Part  Specification
.. Backup Battery
The absolute specification uses a secondary battery (nickel hydrogen battery) to retain absolute counter data in the FPGA and
supply power to the encoder drive circuit even when the power is cut off.
() Battery Specifications
n o it p ir c s e D m e tI
Classification Cylindrical sealed nickel hydrogen battery
Manufacturer Sanyo Electric Co., Ltd.
Model AB-
Nominal voltage . V (. V x )
Rated capacity 00 mAh
Average life  years
Weight 0 g
Charge time Approx.  hours (continuous)
() Charging the Battery
Always charge the battery when starting the delivered unit and after replacing the battery.
The battery is charged automatically when the controller power is supplied, so keep the main power supply on for at least
 hours.
The actuator can be moved and the position table changed while the battery is charging. Also charge the battery
continuously for at least  hours after the power has been cut off for a prolonged period (but within the specified battery
retention time).
For the specified battery retention time, refer to “Setting switches” in ...
() Replacing the Battery
The battery is a consumable part. Repeated charges will cause the battery characteristics to deteriorate. If you notice that
the battery becomes low very quickly, the battery has probably reached its life. In this case, replace the battery.
Although the replacement interval varies depending on the ambient temperature and discharge condition, as a guide the
battery should be replaced after approx.  years of connecting to the controller.
The battery unit has a label that specifies the date three years from the shipment date.
[Refer to Part  Maintenance, section .]
Use this date as a guide.
Caution
() Applying vibration, impact, etc., to the actuator or moving the slider, etc., while the power is cut off may cause loss of
absolute data.
If the RDY/ALM LED and STATUS  LED on the front panel of the simple absolute R unit illuminate in green and red,
respectively, the next time the power is turned on, an absolute encoder error has occurred. In this case, an alarm reset
and home return must be performed.
Do not move the slider or rod while the power is cut off.
() Since the charge efficiency is particularly affected by the ambient temperature during charge, it is recommended that
the unit be used at normal temperature (+0 to +0 C).
If the ambient temperature exceeds  C, the charge efficiency will drop and the battery will not be charged fully. What
is worse, lower battery performance or leakage of battery fluid may also occur.
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