Hardware manual

LT Description
44
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 t
he 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) -1...1 minute
s
25°C (77 °F) -2.5...1 mi
nutes
50°C (122 °F) -5.5...-0.5 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.