Yaskawa MEMOCON GL120 - Manual (Page 348)

System Components: Functions and Specifications
4.8.2 Battery Module cont.
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b) The status of the indicators during the battery voltage check is as follows.
• POWER indicator: Not lit
• ALARM1 indicator: Indeterminate
• ALARM2 indicator: Indeterminate
c) The status of the output signals during the battery voltage check is as follows.
• PON output: OFF
• ALM1 output: Indeterminate
• ALM2 output: Indeterminate
7. Built-in Battery
1) The BAT Module is equipped with one replaceable battery. This battery provides backup
for data stored in the absolute encoder. The battery backup prevents the rotation amount
data from being lost when the power supply to the BAT Module is turned off.
The CPU Module’s built-in battery cannot be used as a power supply for the absolute
encoder’s backup circuit.
2) The built-in battery has enough power to back up the rotation amount data through a total
of one year of power interruptions when 8 axes of absolute encoders are connected.
However, the backup time is shortened since more power is consumed if the absolute
encoder is rotated during a power loss, although this lifetime varies with the ambient tem-
perature and usage conditions.
3) When the BAT Module’s “ALARM1” indicator lights, be sure to replace the battery with an
ER6VC3N replacement battery within one week. Delay in replacing the battery may re-
sult in the memory content loss of the rotation data in the absolute encoder.
8. Battery Replacement
The battery-replacement procedure is described below.
a) Preliminary Steps
(1) Charging the SUPER-CAPACITOR for the memory backup.
Turn ON the BAT Module external power supply for approx. 10 minutes before
replacing the battery. This is to charge the SUPER-CAPACITOR of the BAT Mod-
ule.
4