Series 16/18/160/180-Model C Maintenance Manual, GFZ-62755EN ...

9. TROUBLESHOOTING (SERIAL INTERFACE SPINDLE) B–62755EN/019.2TROUBLESHOOTINGFOR EACH ALARMAL–01Motor overheatItem Cause of trouble Check procedure Remedy1234Defective fan motorof motorOverload operationDirty motor coolingsystemDisconnection orloose contact ofmotor overheatsignal lineCheck if fan motor isrotating.Check cutting conditionsand how tools are worn.Check load meter forcutting.Check motor cooling systemfor dirt.Check signal line connectionstatus.Replace fan motor.Review cutting conditionsand tools.Clean motor coolingsystem with an air gun orvacuum cleaner.Connect signal linecorrectly.AL–02Excessive speeddeviationItem Cause of trouble Check procedure Remedy12345Overload operation(overload)Defective transistormoduleFuse for protectingdriver on PCBblown or not insertedcorrectly(disconnection,loose contact, etc.)Speed feedbacksignal abnormalityWiring failure(disconnection,loose contact, etc.)Check with load meter.Check if transistor collector-emitteris open.Check if fuses F3A to F3M(models 1S to 26S) or FAto FG (models 30S and40S) are blown or removed.Check level of speed feedbacksignal.Check that cables areconnected correctly.Review cutting conditionsand tools.Replace transistor module.Insert fuses firmly.Replace any blown fuse.Check motor speed detectorand signal cable connection.NOTEHow to check the speed feedback signalObserve the speed feedback signal with an osciloscopeafter turning on power and setting the rotation command off(motor stopped and drive power set off).Observe the test points indicated below, while turning themotor slowly by hand.392