
4.4.7
Battery capacity test
The device can test the capacity of the battery by disconnecting the charger and
draining the battery to almost empty using an external loading resistor. The test is
completed when the battery voltage reaches the defined voltage limit. The battery
capacity can be returned by protocol communication in ampere-hours. The battery
draining current is measured by external Hall sensor connected to analog input 1 (X4
3-4). The loading-resistor current should be routed through the relay contacts of X4
pins 5 and 6.
The test is started by protocol communication command. The information object is
defined in the section [BATTERY_TEST_CONTROL_SC].
Certain conditions can be defined to abort the test.
•
AC voltage is missing.
•
Temperature is too high.
•
Temperature is too low.
•
Battery voltage does not reach the defined completion limit during timeout.
•
Battery draining current too low.
•
Battery draining current too high.
•
Abortion command is issued by protocol communication.
The test is completed when the measured battery voltage stays below the defined
voltage limit. This means the battery is almost empty and the available capacity can be
estimated by multiplying the consumed charge by compensation factor. For example,
if the defined target voltage means the battery to be 90% discharged, a multiplication
factor 1.11 can be used to estimate the available total capacity. The device can
compensate the cabling-loss voltage and include its internal charge consumption to
the total capacity.
Usually, the disconnectors are internally blocked during the battery test and the test
should be remotely stopped (information object
[BATTERY_TEST_CONTROL_SC]) before the disconnectors can be operated. The
blocked state can be indicated by configuring the local/remote status to double-point
indication [DISCONNECTOR_LOCREM_xx].
The load limiter functionality and the heater are disabled during the test.
4.4.7.1
Settings
The battery capacity test settings are defined in the section [BATTERY_TEST].
4.4.7.2
Remote control of the battery test function
Once the battery test functionality is enabled on the configuration file, it can be
remotely controlled by protocol communication. The information object is defined in
the section [BATTERY_TEST_CONTROL_SC].
Section 4
1MRS758459 C
Functional description
32
ARC600
User Manual