Connect the azimuth, elevation and if available polarisation motors directly to the motor drivers. Use shielded cable only. Take care, that the shield is connected to the PE terminal of the motor driver and is NOT connected to the crankcase. Please refer to the schematics shipped together with your sat-nms ACU-ODU for more detailed informations and pin descriptions. The ACU knows two different configuration modes to control a motor driver. They are called 'DIR-START' and 'DUAL-START'. In 'DIR-START' mode, the 'FWD' signal switches the motor on/off, the 'REV' signal controls the motor direction. This is the configuration many frequency inverters use. In 'DUAL-START' mode, the 'FWD' signal switches the motor on in forward direction, 'REV' activates the motor in reverse direction. This configuration mode is convenient to control a motor with relays. At sat-nms ACU-ODU it has to be configured as DUAL-START for AZ, EL and if available for POL drive.