Siemens SINUMERIK 840D Function Manual

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5.4.3 Programmable feedrate overrideFunctionThe "Programmable feedrate override" function can be used to change the velocity level of pathand positioning axes via the part program.ProgrammingSyntax MeaningOVR= Feedrate change for path feedrate FOVRA[= Feedrate change for positioning feedrate FAThe programmable range is between 0 and 200%.Default setting: 100%EffectivenessThe NC/PLC interface signals DB21, ... DBB6 (rapid traverse or feedrate override active) andDB31, ... DBX1.7 (axis-specific override active) do not refer to the programmable feedrateoverride. The programmable feedrate override remains active when these signals aredeactivated.The effective override is calculated from the product of the "Programmable feedrate override"and the "Feedrate override via machine control panel (Page 159)".The default setting for the "Programmable feedrate override" is 100%.The default setting is effective:● If no feedrate override is programmed or● After reset if the machine data:MD22410 $MC_F_VALUES_ACTIVE_AFTER_RESET (F function is active even after reset)is not set.NoteOVR is not effective with G33, G34, G35.5.4.4 Dry run feedrateFunctionThe dry run feedrate is used when testing part programs without machining the workpiece inorder to allow the program or program sections to execute with an increased path feedrate, forexample.V1: Feedrates5.4 Feedrate controlAxes and spindlesFunction Manual, 06/2019, A5E47437747B AA 163