Rexroth Tightening System 350 System Documentation - Rhino ...

48/316 Bosch Rexroth AG | Tightening Technology 5 Construction Guidelines5.3 Integration of the tightening system in an installationATTENTION!5.3.5 Use as a rework stationLeakage currents due to potential differencesIn practice, the CS351 Compact System is often at a large distance to the workpiece. Due to the variousearth potentials/grounding points, potential differences may occur. These potential differencescan result in leakage currents on the hand-held nutrunner and the CS351 Compact System. This caninfluence the monitoring unit for torque detection.⇒ Ensure a defined potential equalization between the nutrunner and the workpiece.Rework stations are always needed where automatic tightenings have generated a faulty tightening (e.g.NOK tightening that could not be automatically corrected by reworking in the tightening system). Reworkstations are usually assigned to several tightening positions, i.e. various tightening programs are necessaryfor reworking and they can be selected by personnel as needed.Table 5–5: Configuration of tightening cells for rework stationsRework stationHand-held nutrunner channelComponents installedCS351 Compact SystemErgoSpin hand-held nutrunnerNoteRework stations should be used as independent tightening cells to e.g. ensure reworking if other tighteningstations fail.5.3.6 Assembly notes for the CS351 Compact SystemNoteDetailed information on assembling the Compact System can be found in the “CS351” operating instructions3 609 929 911.5.3.7 Use of additional components (accessories)5.3.7.1 Socket trayThe socket tray helps to select the appropriate tightening program in dependence on the tool used (socket).Figure 5–5:Example of an 8x socket trayBy connecting to a 24 V interface (IM24V in the tightening controller), the appropriate input signal will beset at the PLC interface. The value of the input signal is dependent on the tool removed from the sockettray. Here, the four inputs 0.0 to 0.3 are used as a 4-bit word. Program selection can thus take place byassigning the program selection bits Prog0 to Prog3 in the PLC table.System 350 | 3 608 878 040/05.2008