19
Be in charge.
Super B.
The BIB must be connected to the male to male cable to the first splitter and from there the
rest of the battery bank can be connected. For further information about the CAN network,
read the manual of the batteries that will be connected to the BIB.
4.6.2. CAN Bus network topology
The CAN Bus must be used in a bus network topology. Do not use a ring- or star topology. The
maximum CAN bus length is limited by the bitrate. The Li-ion battery has a default bitrate of 250kbps
(See table 11) .
Bit rate
Bus length (L)
Max. stub length (S)
Accumulated stub
length
250 kbps
250 m
11 m
55 m
Table 11. CAN bus speed
4.6.3. Termination Resistors
The CAN bus requires termination at the two outer ends of the bus. It is advised to use the
termination resistors (see paragraph 3.7) at the end nodes to prevent reflections on the line.
The value of this resistor should be 120 ohm.
4.6.4. Installation of the CAN power cable
A 12V system always needs a CAN power cable. In a 24V or 48V system up to sixteen
batteries the BIB provides power for the CAN bus. In any 24V or 48V system with more than
sixteen batteries the CAN bus must be powered externally, using a CAN power cable. The
CAN bus power should be at least 10V and should not exceed 30V! Therefore, in any 12V or
24V system the CAN bus can be powered directly by the system power.
!
Warning!
When using a 48V system with more than sixteen batteries, please contact Super-b
to discuss the installation of the system.
There are two possible ways to connect the CAN power cable to the BIB and Li-ion batteries:
1. The first option is to connect the (+) terminal (red wire) of the CAN power cable to the load side of the
main relay. There is a disadvantage to this setup; when the main relay opens the CAN power is cut-off.
This causes the loss of CAN communication between the batteries and the BIB. The load side of the
BIB must be powered to have CAN communication while the main relay is OFF. Without CAN
communication the BIB cannot turn on.
