Termination Resistor; Baud Rate; Connection Of The Inverter In The Can Network - WEG CFW-11 Communications Manual

The CAN interface modules have a green LED to indicate that the interface is powered.

2.1.5 Termination Resistor

The extremes of the CAN bus must have a termination resistor with a 120 / 0.25W value, connecting the CAN_H
and CAN_L signals if the drive is the first or the last element of the segment.

2.1.6 Baud Rate

baud rate
The that can be used by equipment in the CANopen network depends on the length of the cable used in
the installation. The next table shows the baud rates available for the CFW-11, and the maximum cable length that
can be used in the installation, according to the CiA recommendation.

2.1.7 Connection of the Inverter in the CAN Network

In order to interconnect the several network nodes, it is recommended to connect the equipment directly to the main
line without using derivations. During the cable installation the passage near to power cables must be avoided,
because, due to electromagnetic interference, this makes the occurrence of transmission errors possible. In order to
avoid problems with current circulation caused by difference of potential among ground connections, it is necessary
that all the devices be connected to the same ground point.
Table 2.2 - CAN interface supply characteristics
Supply Voltage (V
Minimum Maximum
11
Current (mA)
Minimum Maximum
20
Table 2.3 - Supported baud rates and installation size
Baud Rate
1 Mbit/s
500 Kbit/s
250 Kbit/s
125 Kbit/s
100 Kbit/s
50 Kbit/s
20 Kbit/s
10 Kbit/s
Figure 2.1 - CFW-11 in CANopen network
)
DC
Recommended
30 24
Medium
50 30
Cable Length
40 m
100 m
250 m
500 m
600 m
1000 m
1000 m
1000 m