AFNZPxxx– DUALACE2 NEW GENERATION – User Manual Page 49/169
CAN bus interface is isolated with Opto-couplers and internal +5 V supply from
isolated DC/DC.
The CAN driver gives maximum amplitude on the CAN_H to CAN_L signal.
Ground reference for CAN, CAN_GND, must be routed together with CAN_H and
CAN_L in the CAN-bus to avoid communication problems.
There is internal high impedance connection between CAN_GND and B- for ESD
protection and EMC suppression components.
Incorrect use of isolation - risk of personnel injury. Isolation is only for
increased noise immunity when running high current to the motor. The
isolation must not be used for safety.
i.e. CAN_GND and B- shall be externally connected together in one point in
the vehicle system.
Protection
CAN bus interface is protected against accidental connection to +B and –B and
ESD protected.
Connector position
Standard Premium
A20, A21, A22 A30, A31, A32
The CAN wiring shall consist of a pair of twisted wires for CANH and CANL.
The CAN wiring shall have a characteristic impedance of 60 Ω; both physical ends
of the CAN bus shall be terminated with 120 Ω between CANH and CANL for the
best possible noise immunity.
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