[Reference] Gradient Check

OVERVIEW

**Only Available in Torque, Angle and Yield Control Steps

The Gradient Check is intended to detect serious fluctuations in the coefficient of friction of rotating joint components during a tightening cycle. After Threshold Torque is reached, slopes (Torque rise over Angle run) of the Torque/ Angle curve are calculated. The number of samples
(torque is sampled at every degree of socket rotation) to be used for the calculation is the programmed "Slope Interval “parameter. The first slope is not calculated until a "Slope Interval" number of samples have been collected. After the first slope is calculated they are then calculated at each angle increment. Slope sample readings start to be accumulated at the Torque Threshold point.

Slope calculations are checked to see if they are below the Gradient High limit and above the Gradient Low limit. The High Gradient limit is an active limit. If it is exceeded during a cycle the tightening is stopped and a fault declared. The Low Gradient limit check is passive and checked at
the end of the tightening.

VISUALIZATION