semaphore TBOX LT2-530 Series, Руководство пользователя, Страница: 158 / 197

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19.2. Lithium Battery Implementation
TB
OX
LT2
is equipped with a Lithium battery (3 V).
This battery is used to maintain the clock and datalogging when the RTU is out of power (neither Vin not
V bat).
The time the battery has been used can be checked from the analog system variable “BatUsage”. It
returns the number of second the
TB
OX
LT2
has been out of power and the Lithium battery has
delivered current to the SRAM.
We advise to consider replacing the battery when the value reaches 63 072 000 seconds
(=2 years)
In case the battery must be changed, unscrew
TB
OX
LT2
from its rack to access the back of the PCB.
To replace the battery:
1. Cut the 2 plastic spacers
2. Pull out the battery. Be careful not to short-circuit the battery
3. Push the new battery. CHECK POLARITY (see picture)
When you receive your
TB
OX
LT2
the battery is placed but not connected.
Be sure to remove the plastic strip before installation.
After battery replacement or after having removed the plastic strip, the system variable
“BatUsage” should be automatically reset. Check the value = 0.