Rexroth Tightening System 350 System Documentation - Rhino ...

214/316 Bosch Rexroth AG | Tightening Technology 9 Tightening Processes9.2 Tightening program stepsThe Torque threshold is an auxiliary value for measuring the angle. It starts counting the angle pulses assoon as the torque measured at the bolt reaches the value stipulated for the torque threshold for the firsttime. Afterwards, the torque threshold has no more influence on the tightening process, except for correctingthe angle (see page 204).Zero is set as the standard value for the torque threshold, i.e. in this case, angle measurement begins fromthe “start” of the tightening step.Gradient active from,control angleGradient active from and Control angle are displayed if “Yield point” has been selected as a target function.The field Gradient active from is displayed if Gradient has been selected as the monitoring function.The gradient is evaluated from the torque entered under Gradient active from. The step evaluation isdone from the step start if this entry is 0. Entering a torque value is expedient if gradient jumps caused byspeed changes should not be included in the gradient evaluation.These settings are especially important for tightening processes controlled by the yield point (seepage 238).9.2.2.4 Monitoring functionsThe monitoring functions Torque, Angle, and Gradient monitor the entered limits during the tighteningsequence.Activating the respective checkbox for Torque, Angle, and Gradient opens the:– Entry fields for the upper and lower limits– Checkbox + and - checkboxes to activate the monitoring function as switching (optional, otherwisethe monitoring function is only evaluating).The monitoring function Time is always active and switching. The stipulated time span may be changed,if necessary.9.2.2.5 RedundancyThis group field must only be taken into account if using a redundancy measurement transducer. It allowsentries for tolerance values between primary and redundancy measurement values for Torque for monitoringpurposes. The tightening process will be cancelled as NOK if the set tolerances are exceeded.Once the Torque checkbox has been activated, the torque tolerance with the maximum permissible differencebetween the primary and redundancy measurement transducers must be entered. The Activefrom entry field stipulates the torque from which the torque tolerance is monitored. The Active after entryfield stipulates the time span after the start of the tightening step during which the torque tolerance is notmonitored. The entered time must be at least the same as that selected for the start suppression time.NoteRedundancy monitoring is switched off after the target function has been reached.9.2.2.6 Accept valuesThe data is taken over in the tightening program by selecting the Accept button. Data only becomes effectiveafter it has been sent to the controller!9.2.3 Extended tightening stepIn comparison to the standard tightening step, the extended tightening step offers a larger number of targetand monitoring functions for a tightening process. It is used if the tightening process cannot be implementedusing the standard tightening step. An example parameterization can be found on page 239.A new extended tightening step is inserted in the tightening program by clicking on the symbol on the left.Double clicking on the tightening step opens the corresponding dialog for entering the parameters (Fig.9–10).System 350 | 3 608 878 040/05.2008