Siemens SIMOVERT MASTERDRIVES Manual page 678

Technology Option F01
Setting the zero
offset and saving to
EEPROM
NOTE
9-30
In certain applications, it is necessary to save the zero offset directly on
the encoder (in order to modify the position overflow).
It is only permissible to store the zero offset in the encoder EEPROM if
the EQN1325 is used.
A
Rotor position
360°
0°
Rotor position in KK90
200%
-200%
Absolute position in KK100
25
2 - 1 = 33554431
0
Fig. 9-12
Example for setting the offset on EQN encoders:
Encoder:
Parameter setting:
KK100 at point A is
Setpoint at point A
How many increments per revolution are generated by the encoder?
Encoder EQN1325 generates 2048 signal periods per revolution. The
maximum resolution is calculated with quadruple evaluation for position
sensing → this yields 2 to the power of (number of lines + 2)
increments per revolution.
11+2
2 inc / rev = 8192 inc / rev
Traversing direction
Actual position
EQN1325, pulse number 2048
Standard (P147.1 = 1)
27962026, EnDat protocol
10 revolutions
6SE7087-6QX70 (Version AG)
Compendium Motion Control
05.2006
B
Position
Position
Position setpoint
after zero offset
Position
Siemens AG
SIMOVERT MASTERDRIVES