Parker Hannifin S.p.A. Divisione S.B.C. user’s manual TWIN-N and SPD-N
161
(1)
Homing on the negative limit switch and index pulse
10.3.8.1.2 Method 2: Homing on the positive limit switch and index pulse
Using this method the initial direction of movement is rightward if the positive limit switch is
inactive (here shown as low). The position of home is at the first index pulse to the left of the
position where the positive limit switch becomes inactive.
(2)
Index pulse
Positive Limit Switch
Figure 23: Homing on the positive limit switch and index pulse
10.3.8.1.3 Methods 3 and 4: Homing on the positive home switch and index pul.
Using methods 3 or 4 the initial direction of movement is dependent on the state of the home
switch. The home position is at the index pulse to either to the left or the right of the point
where the home switch changes state. If the initial position is sited so that the direction of
movement must reverse during homing, the point at which the reversal takes place is
anywhere after a change of state of the home switch.
(3)
Index pulse
(4)
(4)
(3)
Home switch
Figure 24: Homing on the positive home switch and index pulse
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