Setting up Compax3Defining the reference system44 I11 T11 192-120101 N6 - March 20044.1.5.2 Machine reference modes (MN-Ms)Essentially, you can select between operation with or without machine reference.However, when operating without machine zero, bear in mind that only operation incontinuous mode is possible.31 position data records are possible for operation without machine zero, whereasonly 15 position data records are possible for operation with machine zero,because the machine zero proximity switch is read in via the input I7 (X12/14) towhich address 4 was assigned previously.The zero point for positionings in absolute mode is defined via the machine zeroand the machine zero offset.Machine reference runA machine reference run is required each time after turning on the system foroperation with machine reference. A START after "Power on" automaticallyactivates a machine zero run irrespective of the selected data record.In a machine zero run the drive moves to the position value 0 immediately afterfinding the machine zero proximity switch. The position value 0 is defined via themachine zero offset.Using a SinCos Multiturn absolute value encoder (Motor - Option A7) as feedbacksystem, the absolute position can read in when switching on the Compax3. Amachine zero run after switch-on is then not necessary.In this case the reference only needs to be established once! at initial commissioning time! after an exchange of motor / feedback system! after a mechanical modification and! after replacing the device (Compax3)by carrying out a machine zero run.The machine zero run mode 35 "MN at the current position(see on page 47 )" isappropriate for this, because it is therewith possible to operate without proximityswitch, but any other machine zero run mode is possible too ñ if the hardwareprerequisites are fulfilled.When you have once re-established the reference, reset the machine zero runmode to "without machine zero run".Triggering of a machine zero runA machine zero run is triggered with address 0 and START.Note: When operating with machine zero, the address 0 is reserved for themachine zero run.Position referencepoint
