When the SYNC link is used to share the resolver signal between two inverters, the data transfer between the units will cause a minuscule delay in the resolver signal received by the slave inverter. This delay is so small, that it does not cause any kind of perceivable effect on the operation in normal situations.
However, when the motor is running in extremely high field weakening, this delay can affect the accuracy of the torque estimate and introduce a small difference in the torque produced by the master and the slave inverters, which can be seen for example in the DC-link current going through each device. This does not generally cause any harmful or adverse effects, but since the behavior can be slightly unpractical, there is a delay compensation parameter available in firmware version 11 which can be used to correct the behavior and reduce the effect of the delay:
Legacy parameters → mc_measint → encoder_lag_comp_portion_t0 (12361.54)
Default value for this parameter is -1.2, which is correct for the resolver master inverter. In the slave inverter, setting this value to -0.2 will compensate the SYNC link delay. Note that the delay compensation only works in steady-state situations; during heavy acceleration and deceleration, a slight difference between the master and slave inverters' torque and current is normal.
For more information about the SYNC link configuration, see SYNC link physical layer and Configuring resolver signal sharing (SYNC link).