Technology Option F01 08.2012
6SE7087-6QX70 (Version AN) Siemens AG
9-36 Compendium Motion Control SIMOVERT MASTERDRIVES
Resolvers and sin/cos encoders register the absolute rotor position
within one revolution from 0º to 360º. The number of motor revolutions
is counted in addition to this rotor position, in order to measure the
position. If a multiturn encoder is used, the number of revolutions is
determined during initialization. The sum of the motor revolutions and
the rotor position determines the overall position. The transition from
encoder increments to a physical unit such as µm or degrees is
performed by applying the actual value weighting factor (AVWF). The
physical unit of position is referred to below as LU (Length Unit).
The position sensing system operates with a data width of 32 bits and
thus has a value range of:
Minimum Value Maximum Value
-2
31
+2
31
-1
Increments * AVWF -2.147.483.648 2.147.483.647
Length units [LU] -2.147.483.648 2.147.483.647
Example: 1 LU = 1 µm -2.147.483.648 µm 2.147.483.647 µm
Please note that the value range is limited to ± 999 999 999 when
technology option F01 is used [815.4].
A value of 0 in the ones digit of parameter P183 disables position
sensing. The function of the position sensing system is inhibited and all
output connectors have the value zero.
P183 Meaning
Th H T O Thousands, Hundreds, Tens, Ones
X X X 0
Position sensing disabled → no actual position
calculation
X X X 1
Enable position sensing with resolver, pulse
encoder or encoder
X X X 2 Enable position sensing with multiturn encoder
x = not relevant for enabling position sensing.
With a two-pole resolver or encoder, the output of the position sensing
system is set to the current rotor position when the unit is powered up.
The position sensing system thus detects the absolute position within
one revolution of the motor.
If a multiturn encoder is used, the number of revolutions is also
detected.
Principle
Enable position
sensing/encoder
type P183
NOTE
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