104(3) Cold-start level alarmsCode Error name Cause/ActionB8 Pole sense error This controller will conduct excitation phase detection when the servo isfirst turned ON after the power was input. This alarm indicates that thespecified encoder signal level cannot be detected after 100 ms ofexcitation.Cause: (1) Loose or disconnected motor-relay cable connector(2) Brake cannot be released on a controller equipped withbrake.(3) Large motor load due to application of external force(4) Power was input when the actuator was contacting amechanical end.(5) Large slide resistance of the actuator itselfAction: (1) Check the wiring condition of the motor relay cable.(2) Check the wiring condition of the brake cable, and also turnon/off the brake release switch to see if the brake makes“click” sounds.(3) Check for abnormality in the assembly condition ofmechanical parts.(4) Move the actuator away from the mechanical end and thenreconnect the power.(5) If the load is normal, cut off the power and move theactuator by hand to check the slide resistance.If the actuator is suspected to be the cause, please contact IAI.D8 Deviation overflow The position deviation counter has overflowed.Cause: (1) The speed dropped during movement due to the effect ofan external force, etc.(2) The pole sense detection operation after power on isunstable.Action: (1) Check the load conditions—such as whether the load iscontacting a surrounding object or the brake isdisengaged—and then correct the abnormality, if any(2) An overload condition is suspected, so review the loadweight. Reconnect the power and then execute homereturn.E8 Phase-A/B disconnectiondetectionE9 Phase-A disconnectiondetectionEA Phase-B disconnectiondetectionThe encoder cable is disconnected.Cause: (1) Loose or disconnected encoder-relay cable connector(2) Disconnected cable on the actuator endAction: Check the connection condition of the encoder relay cable andconduct continuity check. If the results are normal, pleasecontact IAI.F8 Damaged nonvolatilememoryAbnormal data was detected during the nonvolatile memory check afterstarting.Cause: (1) Faulty nonvolatile memory(2) The memory has been rewritten more than 100,000 times.(The nominal rewrite limit of the nonvolatile memory isaround 100,000 times.)Action: If the alarm generates again after reconnecting the power,please contact IAI.FA CPU error The CPU is not operating properly.Cause: (1) Faulty CPU(2) Malfunction due to noiseAction: If the alarm generates again after reconnecting the power,please contact IAI.