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INTELLIGENT ACTUATOR
Appendix
Battery Backup Function
The X-SEL controller uses the following two batteries.
System-memory backup battery
A coin-type battery is used to back up the position data, SEL program variables, etc., in the controller.
Each controller is shipped with the system-memory backup battery.
Absolute-data backup battery
A separate battery is used to retain the absolute encoder’s rotation data, so that the motor rotation data
can be retained/refreshed when the controller power is cut off. A controller specified with an absolute-
type actuator is shipped with the absolute-data backup battery.
Each battery is explained in details.
1. System-Memory Backup Battery
A coin-type battery with holder is installed in the panel on the front side of the controller, in order to retain
the various data stored in the system memory (SRAM) of the X-SEL controller even when the power is cut
off, thus effectively implementing a system memory backup.
The data backed up in the system memory (SRAM) includes SEL global data, position data, coordinate
definition data and content of the user-data backup memory in the controller with expanded memory (with
gateway function). This data will be retained even after the power is cut off.
Take note that position data and content of the user-data backup memory are also stored in the flash
ROM. Accordingly, no battery is required if operation is always resumed using the data in the flash ROM
after the power has been cut off or a software reset has been performed (in which case the value set in
other parameter No. 20 must be changed to “0” (no backup memory)).
Note: On a controller with expanded memory (with gateway function), only position data from Nos. 1 to
10000 will be backed up. To also back up position data of No. 10001 onward, write the data to the
flash ROM before the power is cut off.
The system-memory backup battery is a coin-type battery (model CR2032). Since the retention
characteristics of this battery will vary significantly depending on the storage temperature and operating
environment, due caution must be exercised when handling the battery.
Although this coin-type battery is readily available in supermarkets, convenience stores, etc., batteries by
other manufacturers may offer different retention characteristics. To maintain consistency, use a battery
by the same manufacturer whenever possible.
<Backup Time>
The recommended replacement interval for the system-memory backup battery is one and a half years.
This may be a little misleading. It means that if the battery is left at a surrounding air temperature of 40C,
it will retain the stored data for one and a half years. In normal operating conditions, the battery can retain
data for a longer period.
As a guide, the battery will last for around three years if the controller is used at a surrounding air
temperature of 40C with the controller powered up 50% of the time.
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