Changing The Phase Relation Of A(Sin), B(Cos), Z - Balluff BML Información Básica

Interfaces for BML Magnetic Encoder System
2
Interfaces (continued)
2.6.2 Changing the phase relation of A(sin),
B(cos), Z
As a standard the 6 output signals from the BML (+A(+sin),
–A(–sin), +B(+cos), –B(–cos), +Z, -Z) are connected to the
associated inputs on the controller (+si, –si, +co, –co, +z,
–z). Unless s = (+si) – (–si) and c = (+co) – (–co).
The corresponding signal trace as a function of travel is
shown in Fig. 2-15. z is always at the same position.
Some controllers require a different phase relation between
the s-, c- and z-signal. By exchanging the 4 s- and
c-signals the phase relation can be shifted at a multiple of
90°.
alpha_0
c
−90 0 90 180 270
s
z
c
alpha_90
s
−90 0 90 180 270
z
s
alpha_180
c
−90 0 90 180 270
z
s alpha_270
−90 0 90 180 270
c
z
Fig. 2-15: Four different phase relations for s, c and z
alpha 0°
s = A(sin)
c = B(cos)
R =
Tab. 2-3: Signal relationship and wiring range for various alphas
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360 450 540 630 720
360 450 540 630 720
360 450 540 630 720
360 450 540 630 720
90°
B(cos)
–A(sin)
Fig. 2-16 shows the wiring range R for the relations for
Fig. 2-15 alpha = 0. The wiring range R for the other
alphas can be seen in Tab. 2-3.
+A(+sin)
–A(–sin)
BML
R
+B(+cos)
–B(–cos)
Fig. 2-16: Wiring range for alpha = 0
Tab. 2-3 shows the signal relationships for the 4 cases
alpha = 0°, 90°, 180°, 270°.
180°
–A(sin)
–B(sin)
+si
–si
Controller
+co
–co
270°
–B(cos)
A(sin)
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