IX34208a_e.doc / Aug-09
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5.4.3.
Operation with Zero-Crossing
As a special advantage, the round-loop mode can be used to bypass the mechanical encoder
overflow position, because in this mode the unit continues with steady operation, even while
the SSI encoder signal passes the mechanical overflow position from maximum to zero.
This feature can help to avoid mechanical adjusting of the encoder zero position with many
applications, when no other means for the mechanical zero definition is available.
In general the Reset input will be used to define the zero position. The following picture
explains the details of operation.
8192
3500
r-LooP = 6000
0-PoS = 3500
Original encoder signal
Display
360
o
degrees
0
o
Overflow
Encoder: 13 Bit
Direction = 0
r-LooP = 6000
0-PoS = 3500
Overflow suppression with a 13 bit SSI encoder
