2 Installation and Wiring
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2 EMC precautions
Before power-on, check whether there is short circuit between the 24 V, COM, CAN+,
CAN- cables and other cables.
Ensure that the communication cable is separated from the power cables. If the
strong-current cables and weak-current cables are laid in parallel, the strong-current
cables are laid at a side, and the weak-current cables are laid at another side; a
grounding cable is used to separate them.
The traveling cable must be grounded.
Use a four-core cable as the communication cable, with one core connected to 24
VDC, two cores connected to CAN+ and CAN-, and the other core connected to COM.
In the case of high rate and long distance transmission, the shielded cable is not
recommended because it has long transmission delay. The transmission distance has
little relation to the cable diameter.
3 Typical site problems on CAN communication and handling
1) Problem 1: Check whether the termination resistor is connected correctly.
the value is too small, an unnecessary resistor is connected besides the termination
resistors at two ends. In this case, you need to disconnect this unnecessary resistor.
2) Problem 2: Check the communication cable.
The communication cable must be twisted pair with metal shield. The cable sectional
area is 0.75 mm
2
at minimum. All common terminals COM are connected together (not
connect to the system grounding cables). The power supply of all the nodes must be
grounded reliably.
3) Problem 3: Check with us whether the protocol is customized special protocol.
Check with us whether the protocol is customized special protocol.
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