The Control Techniques Commander SE Microdrive series is an AC open loop vector that provides great flexibility as well as a small footprint. Although this series is reliable you may encounter one of the HF Trip codes listed below. These codes are a result of an internal error in the drive. Most often these trip codes can be resolved by powering down and allowing the drive sit for 5 minutes before powering up again. If the HF Fault code does not clear then your drive will likely require a repair.