SpeedStar 90700AG Control Board – Firmware Bug Causing Carrier Frequency forced to default

For the SpeedStar drive having firmware Version v1100 rev08 in the 90700AG control board, the carrier frequency (CF) was forced to default 2.2kHz each time the drive stopped or tripped. Furthermore, Instruct was not aware about this change and would be still registering the last Carrier Frequency value set by the user. While this will not affect the operation of most ESP application, it could cause problem for high speed ESP application which requires higher switching frequency.