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

8. TROUBLESHOOTING B–62755EN/018.12ALARM 300(REQUEST FORREFERENCEPOSITION RETURN)Remedies When reference positionreturn function ispresent When reference positionreturn function is notpresent When serial pulse coderis changedAbsolute position data in the serial pulse coder was lost.(This alarm will be generated when serial pulse coder is exchanged orposition feedback signal cable of the serial pulse coder is disconnected).Machine position must be memorized using the following method:(1)Execute manual reference position return only for an axis for whichthis alarm was generated.When manual reference position returncannot be executed because of an another alarm, set parameter 1815#5to 0 and release the alarm and perform manual operation.(2)Press RESET key at the end of reference position return to release thealarm.Execute dogless reference position setting to memorize the referenceposition.Since the reference position is different from the former one, change thegrid shift value (PRM 1850) to correct the position.Related parameters1815#7#6 #5APC x#4APZx#3 #2 #1 #0System configuration#5(APCx) 0 : Position detector is incremental pulse coder.1 : Position detector is absolute pulse coder.#4(APZx) Reference position of absolute pulse coder is :0 : not established1 : establishedMain CPU boardor option 2 boardSERVOxPWM signalServoamp.Power cableFeedbacksignalBatteryunit 6VPCServo motorPC : pulse coder336