The inlet drive fault occurs only when the IBC system is running or attempting to run the inlet blower. When the IBC system starts the drive, it waits for a “started” signal that comes back to the drive. If the “started” signal is not received within 3 seconds, the IBC system reports an inlet drive fault. If you are commissioning the line for the first time, check the programming on the drive so that it provides a “At RUNNING” signal when the drive is started. This signal must turn OFF when the drive is stopped (make sure the drive is configured for Coast-To-Stop). If the drive has just started exhibiting this problem after running properly for some time, check the drive fault history table for details the drive may have detected during running.