7vacon • 46 Fault tracingLocal contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/7.3 Other fault conditionsThe following fault tracing diagram will help you to locate and fix some of the most usual problems.If the problem persists contact your local distributor.Figure 9. Fault tracing diagram for Modbus RTU.Check cabling Check grounding9330.emfNo communicationCounter OKPoorcommunicationCheck communi-cation status (par.5.7.3.2.1/5.8.3.2.2)Counter does notrunCounter for badframes (see Table3) increasesCheck fieldbusparametersbus parameters inmenuCheck other field-Check selectedprotocolCheck terminationresistorsCheck that bothends of the fieldbusline hav termi-nation resistors(chapter 4.4)Check parameterseIs the device inREADY state?Check Master’sparametersIs fieldbus selectedas control place?Does Master giveRUN command?Check cablingCheck terminationresistors Other bus devicesCheck connectionsCheck the led onkeypadCheck externalinterlockings (I/O)Check configura-tions (Sla e add-ress, baudrate etc.)vCheck distancesbetween cables,see chapter 4.4.Check cable types,see chapter 3.Check grounding,see chapter 4. Re-member to makegrounding for eachdevice! Check terminals forloose connectionsCheck stripping ofcables andconductors, seechapter 4.Use keypad tomonitor variableCheck that bothends of th fieldbusline have t rmina-tion resistors(chapter 4.4)eeCheck cable forcutsCheck correct place-ment of conductorsin terminalsCheck othernecessary devices(e.g. router)Drive does notstart from the busCheck parameterM1.15 or M3.2.1