5.3 Operating Using Speed Control with Analog Voltage Reference5-195 Operation5.3.2 Reference Offset AdjustmentIn speed control, the servomotor may move at a very low speed with an analog voltage reference of 0 V. Thisoccurs because the reference voltage of the host or external circuit has a slight offset of a few millivolts.If the servomotor moves at a very low speed, the offset needs to be eliminated using the offset adjustmentfunction.Use either automatic adjustment or manual adjustment. Automatic adjustment uses the automatic adjustmentparameter for analog (speed and force) reference offset (Fn009). Manual adjustment uses the manual adjust-ment parameter for speed reference offset (fn00A).(1) Automatic Adjustment of the Speed Reference OffsetThe automatic adjustment of the offset automatically measures the amount of offset and adjusts the referencevoltage.After completion of the automatic adjustment, the amount of offset is stored in the SERVOPACK.Adjust the speed reference offset automatically using the following steps.The speed reference offset must be automatically adjusted with the servo OFF.OffsetReferencevoltageReferencevoltage Offset automaticallyadjusted in SERVOPACK.SpeedreferenceSpeedreferenceAutomaticoffsetadjustment
