
421
Appendix
2. Absolute-Encoder Backup Battery
If the X-SEL controller is to drive an absolute-type actuator, an absolute-encoder backup battery must be
installed in the robot or controller.
An absolute encoder is designed to retain rotation data and detect rotations using the power supplied from
the absolute-encoder backup battery, even when the controller’s control power is not supplied. This allows
the controller to resume positioning control immediately after the controller power is restored, without
performing home return.
<Backup Time>
The recommended replacement interval for the absolute-encoder backup battery is two to three years. It
means that if the battery is left at a surrounding air temperature of 40
C (with the power not supplied at all),
it will retain the stored data for two to three years. In normal operating conditions, the battery can retain
data for a longer period. As a guide, the battery will last for around twice the specified period if the
controller is used at a surrounding air temperature of 40
C where the controller powered up 50% of the
time.
<Battery Replacement>
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
C if the power is supplied to the controller continuously. Once a battery error occurs, operations can no
longer be performed unless the battery is replaced and an absolute encoder reset is performed.
If the controller is not operated at all, the above periods should be reduced to 70% at 20
C or to 60% at
40
C.
The controller is designed so that the data will not be lost for at least 15 minutes without a battery if the
controller is not detecting a battery error. Remember to complete the battery replacement within 15
minutes.
The absolute-encoder backup battery is replaced differently depending on whether a battery error has
generated or not. If an error has not been detected yet, the battery needs to be replaced and the absolute
encoder must be reset. If an abnormal absolute-encoder backup battery voltage error has been detected
(error No. 914, CA2), an absolute encoder reset will be required.
422
Appendix
The X-SEL-PX/QX controller provides an absolute-encoder backup battery enable switch for each linear
movement axis. When replacing any absolute-encoder backup battery following a battery error, turn OFF
the absolute-encoder backup battery enable/disable switch corresponding the applicable axis (the
controller power should be turned off during the battery replacement). Once a new battery has been
installed, turn on the controller power, and then reset the absolute-encoder backup battery enable/disable
switch to the ENB (enable) position. If this procedure (turn on the controller power
enable the switch) is
not followed, the absolute encoder data will not be backed up and the absolute-encoder backup battery
will consume abnormally large amounts of power. In the worst condition, the battery voltage may drop to
zero in several weeks.
There is no absolute-encoder backup battery enable/disable switch for SCARA axes.
Reference Battery Replacement Intervals
Reference battery replacement interval (at 40
C)
Battery
model
Power ON time 0%
Power ON time 50%
ARM length 120/150/180
AB-6
SCARA axis
ARM length 250 ~ 800
AB-3
3 years
5 years
Linear movement axis
AB-5
2 years
4 years
List of Absolute-Encoder Backup Battery Functions
Battery voltage
3.6 V
Detection voltage for battery
voltage low alarm
(Typical) 3.1 V, 3.0 V ~ 3.2 V
Detection voltage for battery
voltage low error
(Typical) 2.5 V, 2.3 V ~ 2.2 V
Time after alarm detection until
error detection (reference)
10 days at 20
C based on continuous operation; 7 days if the power is
not supplied at all.
10 days at 40
C based on continuous operation; 2.5 days if the power
is not supplied at all.
Minimum data retention voltage
Min 2.7 V (Varies depending on the encoder characteristics)
Data protection time during battery
replacement
(Retained by the super capacitor)
15 minutes (Maximum retention time when no battery is installed in the
battery holder)
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Содержание X-SEL PX
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