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01.99
4.11 Direct measuring system for position control (from SW 3.3)
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Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
4.11
Direct measuring system for position control (from SW 3.3)
Alternative to the motor encoder (indirect measuring system, IM) in the
”positioning” operating mode, a direct measuring system (DM) can be
used for closed–loop position control.
The direct measuring system for drive A, for a 2–axis control board, is
connected to X412 (motor encoder, drive B). In this case, drive B must
be de–activated.
After the direct measuring system has been activated, the drive evalu-
ates both measuring systems as follows:
Motor encoder, drive A (IM) at X411:
––>
for the closed–loop speed control of the axis
––>
for the coarse synchronization of the axis rotor position
Direct measuring system (DM) for drive A at X412:
––>
for the closed–loop position control and
”precise” position sensing of axis A
Advantage:
The ”actual” position of the axis is sensed using a direct measuring
system. Any play between the motor and table is corrected.
ÍÍÍÍÍÍÍÍ
Table
gear
Spindle
ËËËËË
Linear scale
(direct meas.
system, DM)
Sensor head
Coupling
Motor with
encoder
(indirect
measuring
system, IM)
Ä
Ä
Motor encoder drive A
X411
X412
if P0250 (A) = 1
––> Motor encoder, drive B
but
––> a direct meas. system
is connected for drive A
ÄÄ
ÄÄ
Fig. 4-22 Indirect and direct measuring system for drive A
Description
4 Commissioning
05.00
! not 611ue !