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Function description
Wieland Electric GmbH | BA001052 (Rev. A) | 11/2018
15
Warning!
In order to avoid potentially hazardous situations including fire hazard, safety recommendations must be followed.
Only authorized staff can install the unit.
Warning!
For Lithium cells the balancing and protection circuit must be included in the battery pack.
Warning!
For Nickel batteries the use of the external temperature sensor is mandatory. The sensor must be placed in contact
with the battery.
5.1.4
Coulomb counter
The UPS module measures the current flowing from / to the battery to keep track of the capacity available
on the battery. The capacity is measured in Ampere Hour [Ah]. The value shown is based on the following
assumptions:
•
The value shown is just informative and does not represent the real state of charge of the battery
in some circumstances, for example if the battery is damaged.
•
When the battery is connected for the first time or the system starts from OFF, the system as-
sumes the battery is fully discharged and start with 0 Ah counter.
•
Once the battery is fully charged the system sets the counter to the nominal capacity specified
by the user. See no. 12 in section 6.2 for more details.
5.1.5
PC shutdown and automatic restart
PC shutdown:
In case the UPS module is used to supply a PC it is possible to automatically shut down
the PC after an adjustable time of backup. For this the PC must run the user software and must be con-
nected through Modbus. Optionally the user software can call a task on the PC before shutting down, for
example to backup some sensitive data.
Automatic restart:
UPS module is able to automatically restart a PC which was powered OFF by mistake,
for example in case of the Operating System (OS) crash. The user may adjust an output current threshold
and a timer used for detecting the PC OFF status. In order to restart the PC, the UPS module toggles the
output OFF and then ON again. User must enable in the PC BIOS the automatic start in case of supply
ON.
The diagram below shows the UPS module's behavior when Shutdown and Automatic restart is enabled.
Figure 10 Shutdown and restart chart
WARNING
WARNING
WARNING