Toshiba nv Series - A.6 Life-time Components

Appendix A Specification
6F8C1575
94
A.6 Life-time Components
■ Battery (Memory backup battery)
To keep the backup and calendar data retained, replace the memory backup battery
every 90 days of the total period of power outage or every 5 years when the annual
average temperature is 30
 C
or less, or every 2 years when the annual average
temperature is 30
 C
or more of operation rate is 95% or more.
Objects: HBTM12*AS (battery module)
■ Aluminum electrolytic capacitor
If the module applies an aluminum electrolytic capacitor (a life-time component) under
the following: conditions: average operating ambient temperature 40  C and the standard
installation status (natural air cooling), the recommended replacement cycle of this
capacitor is 8 years.
■ Fuse
The fuse may be blown by fatigue due to rush currents as well as by short circuit or
overcurrent. Replace or overhaul the module in the recommended replacement cycle, or
every 10 years.
Objects: DO934 (32-point DC output), DO935 (64-point DC output)
■ Photocoupler and photonic device
These are designed to be available for the period of expected useful life, i.e., 10 years
(under the conditions of an operating ambient temperature of 40  C and nature air
cooling). Because these are lifetime components, their characteristics, however, may
degrade due to unexpected secular change. If you use them for over 3 years, monitor
the status by verifying operation periodically once a half year. If you find some change in
operation, consult with sell division or development group.