Direct Measuring System For Position Control (From Sw 3.3) - Siemens SIMODRIVE 611 universal Function Manual

Control components for closed-loop speed control and positioning
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4.11

Direct measuring system for position control (from SW 3.3)

Description
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:
S
S
Advantage:
The "actual" position of the axis is sensed using a direct measuring
system. Any play between the motor and table is corrected.
Fig. 4-22 Indirect and direct measuring system for drive A
E 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)
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
X411
Motor encoder drive A
Motor with
encoder
(indirect
measuring
system, IM)
Ä Ä Ä Ä
Ä Ä
Coupling
4 Commissioning
X412
if P0250 (A) = 1
––> Motor encoder, drive B
but
––> a direct meas. system
is connected for drive A
Linear scale
(direct meas.
system, DM)
Sensor head
Ë Ë Ë Ë Ë
gear
Í Í Í Í Í Í Í Í
Spindle
Table
4-193
4

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