Alpha Technologies Cordex CXCRF 48-300W - Manual (Page 36)

0300072-J0 RevA Page 32 of 46
Figure 28: Bs voltage
4.3.4 Battery Setup
The battery and related alarms can be configured individually.
Temperature compensation
The bus voltage (and hence the battery charging voltage) can be automatically adjusted proportionate to the
ambient temperature around the batteries.
The value of this compensation is given by the battery manufacturer. Note that the compensation is usually
given per 2V cell. As the DC Bus is 48Vdc, this value must be multiplied by 24 to obtain the figure to be set in
the dedicated field of the Comp@s menu (see Figure 29 below).
Figure 29 : Temperature compensation
Battery String Capacity
The “Battery String Capacity” is the Ah value of the installed battery blocks (see Figure 30).
NOTE:
You should not install a battery with a capacity greater than 62Ah. Therefore the “battery string
capacity” is limited to 62Ah.
Battery Charge Current Limit
The maximum charging current is defined by the user. Usually the maximum charging current in Amps is one
tenth of the battery capacity in Ah. Refer to the specifications of the battery and the recommendations given by
the battery manufacturer.
NOTE:
The maximum battery current is calculated as the difference between the available rectifier
current (up to 7 Amps per rectifier at 43Vdc) and the load current.
The “Battery Charge Current” limit is factory pre-set to 1000 Amps. This means the batteries
are not subject to a current limitation. The maximum charging current can be automatically
limited by changing the setting in Comp@s.
Battery Temperature
The same sensor is used both to monitor battery temperature and to provide the temperature compensation
reference. The battery temperature function is always active and a battery alarm is given by the MCU LED and
the corresponding relay. An alarm is generated when the battery temperature reaches one of the trip levels (low
or high limit). A “Battery Temperature Sensor Fail” alarm is indicated when the temperature sensor is out of
range: i.e. open circuit, not connected or in short circuit.