Actual Speed Values; Encoder 1 Actual Position Value 1 (G1_Xist1); Encoder 1 Actual Position Value 2 (G1_Xist2) - Siemens SINAMICS DCM Operating Instructions Manual

10.10.1

Actual speed values

The calculation of the actual speed value can be seen in the following function diagrams:
● FP4710 (for encoder 1)
● FP4711 (for encoder 2)
The actual speed values of the encoders are always available as freely interconnected BICO
outputs.
● r0061[0]: Actual speed value for encoder 1
● r0061[1] = r3370: Actual speed value for encoder 2
If you want to use an actual speed value from the encoder as an actual-value input, you
need to set the actual speed value selection p50083 to 1 (for encoder 1) or to 5 (for encoder
2). See FP6810.
The maximum speed (i.e. the 100 % speed) is set via p2000 in both cases.
10.10.1.1

Encoder 1 actual position value 1 (G1_XIST1)

● Resolution: Encoder pulses × 2n
● Used to transfer the cyclic actual position value to the controller.
● The transferred value is a relative, free-running actual value.
● Any overflows must be evaluated by the master controller.
● Encoder pulses of incremental encoder
● After switching on: Gx_XIST1 = 0
● An overflow in Gx_XIST1 must be viewed from the higher-level controller.
● There is no modulo interpretation of Gx_XIST1 in the drive.
10.10.1.2

Encoder 1 actual position value 2 (G1_XIST2)

Different values are entered in Gx_XIST2 depending on the function.
● Priorities for Gx_XIST2
The following priorities should be considered for values in Gx_XIST2:
SINAMICS DCM DC Converter
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
n: Fine resolution, number of bits for the internal multiplication
The fine resolution is specified via p0418.
Figure 10-36 Classification and settings for Gx_XIST1
Descriptions of functions
10.10 Encoder evaluation
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