The emergency drive unit enables you to complete the procedure by means of hand cranking. It is operated by turning the hand crank clockwise. The hand crank turns freely in the opposite direction (anti-clockwise). The corresponding pump speed is displayed on the LEDs of the emergency drive unit. The retaining key at the pump head receptacle locks the Revolution® CBP into place and acts as a protection against torsion during opertion. The holder with clamping screw facilitates the mounting of the emergency drive unit to the mast system of the S3/SC and SCPC System.