Operation The Ultra Module is used to build a torque limiter by fitting a hardened seat into one half of a coupling and the module unit into the other in such a way that the torque is transmitted between the plunger and the seat. This produces an end thrust in the plunger in proportion to the applied torque. This force is resisted by a ring of balls trapped between flat and conical washers loaded by disc springs. When the axial force reaches a level greater than the reaction through the spring mechanism the plunger will retract forcing the balls up the plunger slope allowing it to disengage from the seat. The balls are then located on the larger diameter of the plunger and all forces are balanced internally allowing the torque limiter to run free and unloaded. Resetting is achieved by simply aligning the two halves of the coupling in order to position the plunger over its seat and tapping the reset plunger with a soft hammer. This will cause the plunger to move forward allowing the balls to return to their original positions. Units can be supplied with synchronous reset and, for slow speed applications, automatic reset version are available. Torque adjustment is facilitated by simply rotating the hexagonal nut to either increase or decrease spring pressure. Once set, a calibration spacer may be fitted to discourage unauthorised increased torque setting adjustment. Three set screws lock the adjusting nut. Manual disengagement is achieved by clockwise rotation of the disengagement sleeve which provides a useful aid during plant set up and maintenance, where drive disengagement is of benefit. Series 800 Ultra Module Unit Size Module (Size-No) Max. Bore Inches (mm) Max. Speed (RPM) Max Torque in. lbs. (Nm) 806-1 1-4 3.150 (80.0) 3800 10,000 (1,130) 806-2 2-3 4.000 (100.0) 2400 30,000 (3,390) 806-3 2-4 4.750 (120.0) 2150 50,00 (5,650) 806-4 3-4 6.000 (150.0) 1750 100,000 (13,300) 806-5 4-3 7.000 (180.0) 1400 230,000 (26,000)