Automatic calibration of the current sensors offset. AUTONULL selects the zeroing method.
0 - After approx 10 sec from disable the phase
currents are
sampled and offsets are computed.
1 - At enable a PWM of 50% is maintained on all phases for 50mSec,
currents are
sampled and offsets are computed.
2 - Offsets are user defined by the commands IAOFF and ICOFF.
In order for the process to produce accurate results, the motor should be near or at rest during the nulling process. When using AUTONULL 0 or 1, the resulting offsets are written to IAOFF and ICOFF variables. When phase current offset is not calibrated at one or two phases, a torque ripple component is introduced with an appearance of once per electrical cycle.
Firmware Versions: 3.4.2 and higher
Range: 0 - 2.
Default: 0
EEPROM: Yes