Position Measuring System - Siemens SINUMERIK 840D Description Of Functions

4 Firmware Drive Functions

4.10 Position measuring system

4.10 Position measuring system
Description
Minimum and
maximum
velocity
Phase error
compensation
5008 ENC_PHASE_ERROR_CORRECTION
Encoder phase error compensation
Unit: Default:
Degrees 0.0
5011 ACTUAL_VALUE_CONFIG
Actual-value sensing configuration
Bit 0= 0: No inversion
1: Inversion of actual value
Bit1= 0: No phase error compens. activated
1: Phase error compensation activated
Bit3= 0: No absolute value encoder (EnDat)
1: Absolute value encoder (EnDat) connected
Bit4= 0: No linear measuring system
1: Linear measuring system connected
Bit7= 0: No distance-coded measuring system
1: Distance-coded measuring system connected
Bit8= 0: No zero marker selection by NC
1: Zero marker selection by NC
Unit: Default:
HEX 0
4-140
SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
Only one measuring system can be connected for each axis to measure the
position of the piston rod. The A and B tracks of the measuring system must
produce sinusoidal signals offset by 90° and an amplitude of 1 V
graduations of a linear scale are subdivided 2048 times in the HLA module, the
lower bits losing their significance in some cases. The sign of the actual-value
sensor can be reversed. (Signs are reversed by a software function).
The minimum or maximum possible velocity is dependent upon the position
measuring system.
S
V : of the position measuring system must not be exceeded.
max
The maximum measuring velocity must be set in MD 5609:
ENC_SPEED_LIMIT (see Section 4.13.1).
V must not exceed the 350 kHz bar frequency of the connected measur-
max
ing system.
V
max,bar
S
V : The number of crossed graduations per velocity controller cycle is
min
small at low velocities. In extreme cases, this can result in uneven move-
ments at low velocities, large scale graduation and short velocity controller
cycle.
Improve by: Select another position measuring system with smaller
scale graduations or increase the velocity controller cycle.
A phase error on tracks A and B can be corrected with the phase error com-
pensation function.
Minimum: Maximum:
–20.0 20.0
Minimum: Maximum:
0 65535
=scale graduation @ 350000 s
Relevant for:
HLA
Data type:
FLOAT
Relevant for:
HLA
Data type:
UNS.WORD
 Siemens AG 2000. All rights reserved
02.99
. The scale
pp
–1
Cross ref.: –
Protection level:
3/3
Effective:
Immediately
Cross ref.: –
Protection level:
3/3
Effective:
Power On