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Appendix
Illustration 8.2 Incremental Encoder Signals
Quad counts
Through edge detection, a quadrupling of the increments
is produced by both tracks (A/B) of the incremental
encoder. This improves the resolution.
Illustration 8.3 Derivation of Quad Counts
SinCos encoder
Like the incremental encoder, the SinCos encoder delivers
2 tracks, one shifted 90° from the other. The signal form is
not rectangular but sinusoidal. This allows a higher
resolution of the encoder position since the 2 analog
signals, SIN and COS, deliver each value between 0 and 1.
MG33R302
Operating Instructions
Touch probe positioning
Go to target position
I 5 X57/5 PCD 1.5
Touch probe switch
I 1 X57/1
Velocity
Reference pos. reached
O 2 X59/2 PCD 1.2
Reset touch probe pos.
I 7 X57/7 PCD 1.7
Touchprobe pos. locked
Illustration 8.4 Touch Probe Positioning
NOTICE
A delay in the touch probe sensor makes the target
position drift. This means that the target position
becomes larger than stated in parameter 19-24 Index
Target Position. To compensate for this, specify a delay
value in parameter 19-03 Touch Probe Delay. Only a
constant delay can be compensated for, and not a
variable delay.
Track error
The PID track error is defined as the difference between
the internal controller setpoint and the actual position. The
track error is specified in user units (UU) and is displayed
in parameter 34-56 Track Error. The maximum tolerated PID
error is entered in parameter 32-67 Maximum Tolerated
Position Error in quad counts (qc).
Danfoss A/S © 04/2014 All rights reserved.
Touchprobe
PCD 1.5
Target
position
19-24 (19-28=2)
8
49
8
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