Siemens PCS7 DP bus fault
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The Siemens PCS7 in the plant uses the DP bus to connect the fans and motor drives for frequency control, but it keeps reporting bus errors quite frequently. Sometimes, if the bus loss lasts for too long, it can cause the inverter to shut down. There is a lot of information available online on using DP to control frequency conversion; in many cases, bus failures occur. Do anyone have any good solutions? PS: The image shows the alarms in the PCS7 system as well as the wiring of the DP lines on site. Please help analyze it, thank you!
Excessive bus interference? Loss of frames: reseat the communication cables, run steel pipes along the entire line, and ensure proper grounding
Control is generally not carried out via communication; you can switch to hardwired 4-20mA control instead
Regarding interference issues, proper shielding and grounding are essential
There is too much interference; grounding the cabinets and wires will solve it.
The DP connector must be done well! The cables should be run in separate cable trays or through pipes. If the interference is too severe, switch to a fiber optic line.