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Manual
Manual 37223E
37223E
easYgen-3000
easYgen-3000 Series
Series (Package
(Package P1)
P1) -
- Genset
Genset Control
Control
©
© Woodward
Woodward
Page
Page 57/67
57/67
CAN Bus Shielding
CAN Bus Shielding
Shield
Shield
CAN bus line
CAN bus line
Connector to easYgen
Connector to easYgen
Figure 6-55: Interfaces - CAN bus - wiring of shielding
Figure 6-55: Interfaces - CAN bus - wiring of shielding
CAN Bus Topology
CAN Bus Topology
NOTE
NOTE
Please note that the CAN bus
Please note that the CAN bus must be terminated with a resistor, w
must be terminated with a resistor, which corresponds to the impedance
hich corresponds to the impedance
of the cable (e.g. 120
of the cable (e.g. 120 Ohms, 1/4 W) at both ends.
Ohms, 1/4 W) at both ends. The termination resistor is connected between CAN-H
The termination resistor is connected between CAN-H
and CAN-L.
and CAN-L.
Figure 6-56: Interfaces - CAN bus - termination
Figure 6-56: Interfaces - CAN bus - termination
Troubleshooting Possible CAN Bus Problems
Troubleshooting Possible CAN Bus Problems
If data is not
If data is not transmitting on the CAN bus, check the following for common CAN bus communication problems:
transmitting on the CAN bus, check the following for common CAN bus communication problems:
•
•
A T-structure bus is utilized
A T-structure bus is utilized
•
•
CAN-L and CAN-H are
CAN-L and CAN-H are interchanged
interchanged
•
•
Not all devices on the bus are using identical Baud rates
Not all devices on the bus are using identical Baud rates
•
•
Terminating resistor(s) are missing
Terminating resistor(s) are missing
•
•
The configured baud rate is to
The configured baud rate is to high for wiring length
high for wiring length
•
•
The CAN bus cable is routed
The CAN bus cable is routed in close proximity with power cables
in close proximity with power cables
Woodward recommends the use of shielded, twisted-pair cables for
Woodward recommends the use of shielded, twisted-pair cables for the CAN bus (i.e.: Lappkabel Unitr
the CAN bus (i.e.: Lappkabel Unitronic
onic
LIYCY (TP) 2×2×0.25, UNITRONIC-Bus LD 2×2×0.22).
LIYCY (TP) 2×2×0.25, UNITRONIC-Bus LD 2×2×0.22).