Danfoss VLT AutomationDrive FC 302 Operating Manual
Also see for VLT AutomationDrive FC 302: Service guideProgramming guideInstruction manualInstallation guideOperating guide
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8.5 TroubleshootingTable 42: TroubleshootingSymptom Possible cause Test SolutionDisplay dark/NofunctionMissing input power. Check for loose connections. Check the input power source.Missing or open fuses. See Open power fuses in this tablefor possible causes.Follow the recommendations provided.No power to the LCP. Check the LCP cable for properconnection or damage.Replace the faulty LCP or connectioncable.Short circuit on control volt-age (terminal 12 or 50) or atcontrol terminals.Check the 24 V control voltagesupply for terminal 12/13 to 20–39,or 10 V supply for terminals 50–55.Wire the terminals properly.Incompatible LCP (LCP fromVLT® 2800 or 5000/6000/8000/FCD or FCM).– Use only LCP 101 (P/N 130B1124) orLCP 102 (P/N. 130B1107).Wrong contrast setting. – To adjust the contrast, press [Status] +[▲]/[▼].Display (LCP) is defective. Test using a different LCP. Replace the faulty LCP or connectioncable.Internal voltage supply faultor SMPS is defective.– Contact supplier.Intermittent dis-playOverloaded supply (SMPS)due to improper control wir-ing or a fault within the ACdrive.To rule out a problem in the con-trol wiring, disconnect all controlwiring by removing the terminalblocks.If the display stays lit, the problem is inthe control wiring. Check the wiring forshorts or incorrect connections. If thedisplay continues to cut out, follow theprocedure for Display dark\No function.Motor not run-ningService switch open or miss-ing motor connection.– Connect the motor and check the serv-ice switch.No mains power with 24 V DCoption card.– Apply mains power.LCP stop. – Depending on the operating mode,press [Auto On] or [Hand On].Missing start signal (Standby). – Apply a valid start signal.Motor coast signal active(Coasting).– Apply 24 V on terminal 27 or programthis terminal to [0] No operation.Wrong reference signalsource.Check reference signal:• Local• Remote or bus reference?• Preset reference active?• Terminal connection correct?• Scaling of terminals correct?• Reference signal available?Program correct settings. Check param-eter 3-13 Reference Site. Set preset refer-ence active in parameter group 3-1* Ref-erences. Check for correct wiring. Checkscaling of terminals. Check referencesignal.Maintenance, Diagnostics, andTroubleshootingOperating Guide | VLT® AutomationDrive FC 302AQ275652476278en-000101 / 130R0709| 127Danfoss A/S © 2019.12 |
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