Installation manual
CNC 8035
5.
CONCEPTS
feedback system
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·198·
5.4.1 Counting speed limitation
Sinusoidal signals
The maximum counting speed (frequency) for sinusoidal feedback is 250 kHz.
The maximum feedrate for each axis on linear systems will depend upon the selected resolution
and the signal pitch (distance per pulse) in use, whereas on rotary encoders it will depend on the
number of pulses per revolution.
Example 1:
When using a Fagor linear encoder, the signal pitch is 20 µm. Therefore, with a counting resolution
of 1 µm, the maximum feedrate will be:
20 µm/pulse x 250.000 pulses/sec = 300 m/min.
When using Fagor linear encoders, the maximum feedrate is limited by their own characteristics to
60 m/min.
Example 2:
Using an indexer with a sinusoidal Fagor encoder of 3600 lines per turn, for a feedback resolution
of 1 µm, the maximum axis feedrate will be:
(360 degrees/turn / 3600 pulses/turn) x 250.000 pulses/s. = 25.000 degrees/s.= 1.500.000
degrees /min
Since Fagor sinusoidal encoders admit a frequency of up to 200 kHz, the maximum feedrate will be:
(360 degrees/turn / 3600 pulses/turn) x 200.000 pulses/s. =
= 20,000 degrees/sec.= 1,200,000 degrees/min.
Squarewave signals
The maximum frequency (speed) for differential squarewave feedback is 425 kHz with a separation
of 450 ns between A and B flanks which is equivalent to 90º ±20º.
The maximum feedrate for each axis will depend upon the selected resolution and the signal pitch
(distance per pulse) in use.
When using Fagor linear encoders, the maximum feedrate is limited by their own characteristics to
60 m/min.
When using FAGOR rotary encoders, their intrinsic output frequency limit is (200Kz).
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