Siemens SINAMICS S150 Operating Instructions Manual page 374

Functions, monitoring, and protective functions
9.4 Extended functions
For permanent acceptance, the encoder adjustment offset (p2525) should be saved in a
non-volatile manner (RAM to ROM).
During adjustment with the rotary absolute encoder, a range is aligned symmetrically
around the zero point with half the encoder range within which the position is restored after
switch off/on. If position tracking is deactivated (2720.0 = 0), only one encoder overflow is
permitted to occur in this range (further details are given in chapter "Position controller ->
Actual position value conditioning"). Once adjustment has been carried out, the range must
not be exited because a unique reference between the actual encoder value and the
mechanical components cannot be established outside the range.
If the reference point p2599 is in the encoder range, the actual position value is set in line
with the reference point during adjustment. Otherwise, it is set to a corrected value in the
encoder range.
Search for reference point of incremental measuring systems
The search for reference point (when using an incremental measuring system) is used to
move the drive to its reference point. The entire referencing cycle is controlled and monitored
by the drive.
Incremental measuring systems require the absolute dimensional reference to the machine's
zero point to be established once a machine has been switched on. When the machine is
switched on, the actual position value x0 is set to x0 = 0 if not homed. The search for
reference point can be used to move the drive to its reference point in a reproducible
manner. The geometry gained with a positive start direction (p2604 = "0") is shown below.
Figure 9-25
The signal on binector input p2595 (start homing) is used to trigger travel to the reference
cam (p2607 = 1) if search for reference is selected at the same time (0 signal at binector
374
CAUTION
A
p 2599 r 2599
| v |
p 2605
p 2611
p 2608
p 2612
( 0 )
p 2604
( 0 )
Example: homing with reference cam
p 2600
B
p 2598
( 2599 )
1
3
2
s
p 2610
p 2609
p 2606
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A