User Manual 08/2003 Edition
User Manual 08/2003 Edition
User Manual 08/2003 Edition
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02.99 04.01<br />
Limitations when<br />
referencing<br />
!<br />
Siemens AG <strong>2003</strong> All rights reserved<br />
SIMODRIVE POSMO A <strong>User</strong> <strong>Manual</strong> (POS1) – <strong>08</strong>.03 <strong>Edition</strong><br />
The following limitations apply when referencing:<br />
5 Description of the Functions<br />
5.5 SIMODRIVE POSMO A functions<br />
The positioning motor supplies the following zero marks:<br />
– 75 W motor ––> 4 zero marks per motor revolution<br />
– 300 W motor ––> 1 zero mark per motor revolution<br />
The position of the zero mark, which was last recognized, is overwritten<br />
with the value in P5 (reference point coordinate) by setting<br />
STW.11 (start referencing/stop referencing).<br />
The actual position to be written is corrected by the distance which<br />
was traveled since the last zero mark.<br />
Prerequisite:<br />
The axis must be at a standstill and be in closed–loop control.<br />
If the axis is moving, then the value is not accepted and an alarm is<br />
output.<br />
If the motor was not moved after being powered up, i.e. a zero mark<br />
has still not been passed, and therefore there is no valid position for<br />
a zero mark, then referencing is rejected and a warning output.<br />
The ”referenced” status is lost.<br />
Generally, the following is valid:<br />
ZSW.11 (reference point set/no reference point set) is used to display<br />
whether an axis is referenced.<br />
Resetting the status ”reference point set” (from SW 1.4)<br />
For a stationary axis that has been referenced, the ”no reference<br />
point set” state is re–established by writing a 0 into P98.<br />
The following applies for a non–referenced axis:<br />
– No blocks with absolute position data are executed.<br />
– The axis zero of the axis is the position after the drive has been<br />
powered up.<br />
Warning<br />
For non–referenced axes, the software limit switches are not<br />
monitored.<br />
Suitable measures must be implemented in the system (e.g. hardware<br />
limit switches) in order to avoid injury to personnel and damage to the<br />
machine.<br />
5-143<br />
5