Siemens SIMOVERT MASTERDRIVES Manual page 205

Motion control
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05.2006
RELMOD = 1
(U883=1)
NOTE
With linear axis
With rotary axis
Setting value
Position setting
value
Set trigger
ENABLE_POS
ENABLE_REF
Position of current
actual value
Window width
Pos OK
Siemens AG
6SE7087-6QX70 (Version AG)
SIMOVERT MASTERDRIVES
In the case of relative positioning (POS_TYP_ACT=1), the internal
position value S_pos (KK0871) is used.
This means that, when homing on the fly, the corrected setpoint is not
taken into the travel distance calculation (SET <> ACT).
In some circumstances, the software limit switches no longer refer to
the actual value of the measuring system, as the internal position value
is used.
The travel distance is not corrected, the distance that is specified is
traveled.
In the case of relative positioning with a linear axis, the valid position
setpoint is traveled as the distance.
The movement is only limited to the range
31
31
(from -2
to +2
-1).
The software limit switches can be used with a linear axis.
In the case of relative positioning with a rotary axis, the valid position
setpoint is traveled as the distance.
The movement is otherwise limited to the range
31
31
(from -2
to +2
-1).
The software limit switches cannot be used with a rotary axis.
Auxiliary inputs:
The purpose of the auxiliary inputs is to set the positioner output and to
implement tracking mode.
As standard, the setting value is the actual position value (KK0120
motor encoder) to enable the actual position value to track to the
position setpoint (jump suppression).
The position setting value can also be from another source (motor
encoder/machine encoder) depending on the application.
With [ENABLE_POS], output KK0871 tracks the position setting value
source U850.3 (statically) and all statuses are reset.
With [ENABLE_POS], output KK0871 tracks the position setting value
source U850.3 (statically) and all statuses are reset.
With [ENABLE_REF], output KK0882 tracks the position setting value
source U877.2 (statically) and is corrected in the axis cycle. This
implements the rotary axis representation of the actual position value in
tracking mode.
Here, the actual value of the POS-OK representation is read; the actual
position value can come from the motor encoder or machine encoder,
but can also be from any other source.
The purpose of these auxiliary inputs is to delay the POS_OK signal
output and to influence it if necessary.
For the POS_OK representation, a window width (exact positioning
window) in LU is invoked. The POS_OK checkback is set when the
target position is reached.
Compendium Motion Control
Functions
7-39

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