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

B–62755EN/019. TROUBLESHOOTING (SERIAL INTERFACE SPINDLE)Test pointPA–0VPB–0VRA–0VRB–0VPAA–0VPBA–0V(CW rotation)Normal wave formVp–p=0.36∼0.5V0VAbout 2.5VSame as aboveDC2.5V±0.2VSame as abovePAP ON OFF0VPBPONOFF4.5V0V0.4VCheck that the ON/OFF duty cycle is 50%.(The PAP and PBP signals are inverted in CCW direction.)AL–03Blown fuse in DClink sectionThis alarm indicates that the fuse (F4) in the DC link section is blown.In this case, the transistor module may have failed.AL–04Input fuse blownInput power openphaseItem Cause of trouble Check procedure Remedy12High impedance onAC power supplyside.Example:Two transformersare connected inseries, or variableautotransformer isconnected.Defective transistormoduleAlarm No. 04 is on only attime of deceleration fromhigh speed operation.Alarm No. 04 can be onwhen F1 to F3 are notblown.Change power supply toone with low impedance.There may be loose connectionof input powercableExample:Open phase due toscrews not tightenedfirmlyReplace transistor moduleand fuse.345Defective diode moduleor thyristor moduleDefective surge absorberor capacitorWhen input fuse isnot blownDisconnect diode modulesDM1 to DM3 and thyristormodules SM1 toSM3, then check A-Kconnection with multimeter.(Defective modulesare usually short-circuited.)Check surge absorbersZ1 to Z3 and capacitorsC4 to C6.Check if Item 1 is applicable.Replace defective part.Replace blown fuse.Replace defective part.Replace blown fuse.When Item 1 is not applicable,replace PCB.393