Yaskawa MP940 - Manual (Page 344)

Maintenance and Inspection
8.2.1 Battery Life
8-4
8.2 MP940 Module Battery
The replaceable built-in battery can be connected to the MP940 Module as an option. This bat-
tery is used to prevent the programs and data stored in the memory from being lost when a
power failure occurs (i.e., when the power supply to the MP940 Module is interrupted).
8.2.1 Battery Life
The built-in battery can retain the contents of the memory until the total time of power inter-
ruptions reaches one year. The warranty period of the battery is five years from the date of
purchase. These values, however, differ according to the operating conditions, including the
ambient temperature.
If the BAT indicator on the MP940 Module lights, replace the battery with a replacement
battery (ZZK000065) within two weeks. Any delay in battery replacement will result in the
programs and data stored in the memory being lost.
If two weeks have passed since the BAT indicator first lit, replace the battery (model: ZZK000065, as
an option) within one hour.
The above precaution is based on the following type of situation.
• The BAT indicator lit before a holiday, and the power supply was turned OFF during the holiday.
When the power was turned ON again after the holiday, the BAT indicator was still lit.
8.2.2 Battery Replacement
This section describes how to replace the battery.
„ Preparations
Saving the Memory Contents
Before replacing the battery, save the programs and data from the memory of the MP940
Module to floppy disks or a hard disk. The saved programs and data will be used if the pro-
grams and data are accidentally deleted during battery replacement.