Omron OMNUC 88D-UP20HA, Руководство пользователя

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3-23
H
Operation
•
Incremental pulses are output from the Servo Driver through a frequency divider.
E
A
B
S
Encoder
Servo Driver
Frequency divider
Processing circuitry
A-phase
B-phase
Z-phase
•
The output phases of the encoder signal output from the Servo Driver are as shown below (when
divider rate Cn-0A = 2,048).
Note The width of the Z-phase output pulse is not affected by the divider rate and will remain constant.
A-phase
B-phase
Z-phase
A-phase
B-phase
Z-phase
Forward Rotation Side Reverse Rotation Side
Note When the encoder divider rate is set to other than 2,048, 1024, 512,..., the phase difference for
phases A and B is not 90
°
, but scatters for time T. (See the diagram below.)
t1 t2 t1 t1 t1 t1 t2 t1 = nT, t2 = (n+1)T
A-phase
B-phase
In this diagram, T represents the time between phase A and phase B, and n is an integer that satisfies
the following formula (with digits below the decimal point discarded).
n = 2,048/encoder divider rate
T
A-phase
B-phase
Input to frequency divider
(encoder output)
Operation
Chapter 3