(2) Current Detection Offset Adjustment
The current detection offset is adjusted at the factory prior to shipment: the
user, in principal, doesn't need to adjust it.
However, if adjustment of higher accuracy is required due to a Servopack-
motor combination, perform adjustment as follows:
The switch functions in the current detection offset adjustment mode are
shown in Fig. 4.10.
SW3
SW2 SWd
Fig. 4.10 Switch Functions in Current Detection Offset Adjustment Mode
[] Rotate the motor at about 100r/min, and monitor the torque monitor termi-
nal MON1 using an oscilloscope.
[] Depressing the _ or l DOWN Ikey, perform adjustment so as to have a
minimum torque ripple. LED indication shows offset data.
[] With the _ key, store offset data, then enter the next mode.
[] Because torque ripple must be adjusted with a good balance between U-phase
and V-phase offsets, repeat steps [] and [] several times, to make sure of
an optimum value.
--17--
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