They are comprised of a 32 bit risc-processor. Both controllers adopt the same fastening process control technology.  An optical encoder inside each screwdriver monitors the rotation of the driver motor from the initial rotation until the completion of the fastening cycle. The torque coefficient or factors which influence the torque, is calculated by the controllers software from the continuously monitored electric current to the screwdriver motor and the time factor. The electric current from the controller to the screwdriver motor is based on that continuous analysis, controlled instant by instant. The screwdrivers torque output is in proportion to the controllers electric current output to the screwdrivers motor. The screwdrivers torque curve takes 0.1 seconds and is calculated by a functional circuit until it reaches the target torque. Once the target torque has been reached, it holds that torque for 0.2 seconds to stabilize the torque out put.

• PED controller has one channel for setting the torque output as a standard (two channel controller optional).
• FED controller installed on a robot can catch and loosen an already seated (fastened) screw, and has a memory for 8 preset fastening torque settings and 8 preset angle settings.
• Both controllers can be used for manual and automatic application.