92 Standard program featuresBy default, all the ratios mentioned above are 1:1. The ratios can only be changedwith the drive stopped. The new settings require validation by 91.10 Encoderparameter refresh. Position counterThe control program contains a position counter feature that can be used to indicatethe position of the load. The output of the counter function, parameter 90.07 Loadposition scaled int, indicates the scaled number of revolutions read from the selectedsource (see section Load and motor feedback on page 91).The relation between revolutions of the motor shaft and the translatory movement ofthe load (in any given unit of distance) is defined by parameters 90.63 Feed constantnumerator and 90.64 Feed constant denominator. This gear function can be changedwithout the need of a parameter refresh or position counter reinitialization – however,the counter output is only updated after the new position input data is received.For detailed parameter connections of the load feedback function, see the blockdiagram on page 648.The position counter is initialized by setting a known physical position of the load intothe control program. The initial position (for example, the home/zero position, or thedistance from it) can be entered manually in a parameter (90.58 Pos counter initvalue int), or taken from another parameter. This position is set as the value of theposition counter (90.07 Load position scaled int) when the source selected by 90.67Pos counter init cmd source, such as a proximity switch connected to a digital input, isactivated. A successful initialization is indicated by bit 4 of 90.35 Pos counter status.-21474838+2147483(Proximity switch) Source set by 90.67 101010101010(Initialization inhibit) Source set by 90.6890.35 Pos counter statusbit 4, Pos counter init ready90.35 Pos counter statusbit 5, Position counter re-init disabled(Re-init request) Source set by 90.69Drive fault90.07 Load position scaled int(Initial value) Source set by 90.59(by default, 90.580
