08.2012 Technology Option F01
Siemens AG 6SE7087-6QX70 (Version AN)
SIMOVERT MASTERDRIVES Compendium Motion Control 9-35
9.4.8 Position sensing system for motor encoder [330]
The position sensing system for the motor encoder is shown in [330].
The motor encoder generates a rotor position signal KK090
"Theta(mech)" [500] with a resolution of 2
32
increments per encoder
revolution, from which the position sensing system [330] generates the
actual position value KK120.
In the factory setting (32 - 12 = 20 shift steps), the shift division block
[330.4] generates a raw positional value with 4096 increments per
encoder revolution, which is suitable for most applications using a
resolver. The shift division is used to ensure optimum resolution of the
actual position value and to prevent the numeric range of 32 bits from
being exceeded during extremely long traversing movements (or the
range from -999 999 999 to +999 999 999 when using technology
option F01; see [815.4]).
After shift division, the actual position value is normalized by applying
the actual value weighting factor AVWF such that an increment at the
actual position output KK120 matches the length unit LU in which the
target positions are to be specified. You will find specifications for
setting the AVWF below and in "Defining the actual value weighting
factor" in the section entitled "Commissioning the technology".
The position sensing system includes the following additional functions:
♦ Position correction, which can be used to trap overflows on rotary
axes and roll feeds (is activated accordingly by the technology
[815.5 and 836.8]
♦ Basic control system for homing with incremental encoders
(resolvers, sin/cos encoders, pulse encoders)
♦ Position memory for storing the present actual position if one of the
two interrupt-capable digital inputs on the converter terminal strip is
actuated by a signal edge (terminals X101.6 and X101.7). Printing
index signals from optical sensors or other synchronization signals
can be connected to the digital inputs. This measured position is
processed subsequently on the technology [815 and 836].
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