Technology Option F01 08.2012
6SE7087-6QX70 (Version AN) Siemens AG
9-130 Compendium Motion Control SIMOVERT MASTERDRIVES
9.7.2.4 Connection and parameters of the position sensing system
The technology [815] is connected to the position sensing system for
the motor encoder in slot C [330] using the following circuit. Most of the
parameters can remain in the factory setting (WE):
Signals from position sensing [330] ==> technology [815]:
U535=120 ; Actual position
U529= 70 (WE) ; "Actual position O.K." binector from resolver
; sensor board in slot C [230]
U539=122 ; Measured position from measured value memory
U538=212 (WE) ; "Measured position valid" binector
U537.02=210 (WE) ; "Home position detected" binector
Signals from technology [815] ==> position sensing [330]:
P172=302 ; Position set value
P173=302 (WE) ; "Set position" binector
P174=301 ; Position correction value
P175.01=303 (WE) ; "Correct position +" binector
P175.02=304 (WE) ; "Correct position -" binector
P184=303 ; Position offset
P179=308 (WE) ; "Enable measured value memory" binector
P177=307 (WE) ; Enable homing
♦ Defining the length unit (LU):
In this application example, the actual position measurement is to be
weighted such that the user can specify his position setpoints in the
length unit [1 Length Unit = 1 LU = 0.1°], i.e. in tenths of one degree.
For example, a setpoint of 3600 is to correspond to a distance of
360.0°, i.e. one revolution of the motor. It is assumed that no
gearbox is used.
♦ Determining the actual value weighting factor (AVWF):
With the factory setting P171 = 12, the "shift division block" [330.4]
outputs an actual position signal with 4096 increments per motor
revolution. The actual value weighting factor (AVWF) specifies the
number of length units (LU) per increment. Hence,
AVWF = 3600/4096 [LU/increment] = 0.87890625.
The actual value weighting factor is entered as follows in parameters
P169 and P170 [330]:
P169=0 ; Decimal places of actual value weighting factor
P170=87890625 ; Decimal places of actual value weighting factor
The following parameters enable position sensing and homing [330.2]
for the motor encoder in slot C and select the homing direction in the
direction of increasing positional values (the same direction must be
entered in machine data MD5; see step
):
P1830011 ; Enable sensing and homing,
; positive approach direction for home position
; to right of BERO
Connection of the
position sensing
system
Defining the length
unit (LU) and setting
the actual value
weighting factor
(AVWF)
Configuration of the
position sensing
and homing
systems
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