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

B–62755EN/018.TROUBLESHOOTING(1)Check whether the motor ratated more than one rotation(one rotation signal is issued ) at faster than 128 pulsesof position error amount.Rotated ?YESNOReturn start position is too close· Chagne the return start position.· Move the machine at faster that 128pulses for more than one rotation towards RP.Check that voltage of pulse coder is higher than 4.75 V.To measure pulse coder voltage, remove the motor cover and measure onpulse coder PCB at across + and – or +5V and 0V terminals.More than 4.75VNOYESHardware failure· Pulse coder is faultyChange pulse coder or motor· Main CPU board is faultyChange main CPU board· Option 2 board is faultyChange option 2 boardPulse coder power voltage is low· Caused by wire resistancecheck wire material(resistance shall be 0.5W orless in both ways to restrictvoltage drop.)· Pulse coder power supply isabnormalChange the power supply .CAUTION1 After the pulse coder or motor is exchanged, referenceposition or machine’s standard point may be different fromformer one. Please set it correctly.2 When the main board is exchanged, all the data stored inmemory is lost. Reset all the NC data again, referring to thedata input/output item. ReferenceA speed more than 128 pulses is required because if speed is lower thatthis, one–rotation signal does not function stably, causing improperposition detection.If bit 0 of parameter No. 2000 is set to 1, a speed corresponding to apositional deviation of 1280 pulses or more is required.Parameter No. 1836 can be set to 128 or less, as the minimum positionaldeviation with which reference position return is possible. (If theparameter is set to 0, 128 is assumed as the minimum positional deviation.If bit 0 of parameter No. 2000 is set to 1, a value equal to ten times theset value is used for checking.)335