11
Be in charge.
Super B.
3.3.3. BCI States
The BCI different states, are listed in Table 2 BCI states below:
State
Main relay
Pre-charge relay Description
ON
On
Off
Bank is connected to the DC-bus
OFF
Off
Off
Bank is disconnected from the DC-bus
Pre-charge
Off
On
Bank is pre-charging the DC-bus
Alarm
Off
Off
An error occurred
Shutdown
Off
Off
BCI is in power down mode
Undervoltage
reboot
On
Off
BCI is turned on again after an undervoltage
shutdown
Table 2. BCI States
3.3.3.1 ON state
The BCI is in or can be set to the ON state when there are no active errors. In this state the
BCI enables the main contactor(s), the Li-ion battery bank is connected to the DC bus. The
BCI can be set to ON state using the Be in Charge software, or automatically when the Auto-
On feature is enabled. The BCI can only reach the ON state via the Pre-charge state first.
3.3.3.2 OFF state
In this state the BCI disables all contactors, the Li-ion battery bank is disconnected from the
DC bus. The BCI boots in the OFF state. In addition, the BCI can be set in OFF state manually
by the Be in Charge software.
3.3.3.3 Pre-charge state
A contactor that must switch a large capacitive load can be exposed to high electric current
during initial turn-on. This current, if not limited, can cause considerable stress or damage to
the system components. Pre-charging is implemented to increase the lifespan of electronic
components and increase reliability of the contactor. In the pre-charge state the main relay
is disabled and the pre-charge relay is enabled. Refer to paragraphs 3.3.4.2 and 3.3.4.3 for
details about the behavior on voltage dependent or time dependent pre-charge settings.
3.3.3.4 Alarm state
When the BCI is in alarm the following may have occurred:
•
The number of Li-ion batteries that respond to a present request does not match the number of Li-ion
batteries configured in the BCI. If the error is not resolved within 20 seconds, the BCI goes to OFF state.
•
One or more of the Li-ion batteries reports an alarm. When the alarm of the Li-ion battery is cleared the
BCI stays in OFF state. Depending on which type of alarm the Li-ion battery signaled, this alarm can be
