Technology Option F01
08.2012
6SE7087-6QX70 (Version AN) Siemens AG
9-30
Compendium Motion Control
SIMOVERT MASTERDRIVES
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
B
Traversing direction
Rotor position
Position
0°
360°
Rotor position in KK90
Position
200%
-200%
Absolute position in KK100
Position
2 - 1 = 33554431
0
Actual position
Position setpoint
after zero offset
25
Fig. 9-12
Example for setting the offset on EQN encoders:
Encoder:
EQN1325, pulse number 2048
Parameter setting:
Standard (P147.1 = 1)
KK100 at point A is
27962026, EnDat protocol
Setpoint at point A
10 revolutions
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.
2
11+2
inc / rev = 8192 inc / rev
Setting the zero
offset and saving to
EEPROM
NOTE
