Proface LT4300M - 5.7 Modular HMI + Control" - Manual (Page 44)

LT Description
44
Rear Module Features Section 3.1
Rear Module Features
Clock
Overview
The LT has a clock.
Variations in operating conditions can cause a clock shift:
Battery for Clock
The controller has one battery for the clock.
In the event of a power interruption, the backup battery retains the time and date for the controller.
The table describes the characteristics of the battery:
NOTE: Do not replace the LT unit’s battery yourself. The LT uses a lithium battery for backing up
its internal clock data and the battery may explode if it is replaced incorrectly. When replacement
is required, please contact your local LT distributor.
Ambient Temperature Accuracy (30 days deviation)
0 ° C (32 ° F) -2.5...2.5 minutes
25 ° C (77 ° F) -2.5...2.5 minutes
50 ° C (122 ° F) -5.5...2.5 minutes
Use In the event of a transient power outage, the battery powers the clock.
Duration of backup At least 5 years at 25 ° C max (77 ° F). At higher temperatures, the
duration of backup is reduced.