Parker Hannifin S.p.A. Divisione S.B.C. user’s manual TWIN-N and SPD-N
162
10.3.8.1.4 Methods 5 and 6: Homing on the negative home switch and index pul.
Using methods 5 or 6 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.
(6)
Index pulse
(5)
(5)
(6)
Home switch
Figure 25: Homing on the negative home switch and index pulse
10.3.8.1.5 Methods 7 to 14: Homing on the home switch and index pulse
These methods use a home switch which is active over only portion of the travel, in effect the
switch has a ‘momentary’ action as the axle's position sweeps past the switch.
Using methods 7 to 10 the initial direction of movement is to the right, and using methods 11
to 14 the initial direction of movement is to the left except if the home switch is active at the
start of the motion. In this case the initial direction of motion is Dependent on the edge being
sought. The home position is at the index pulse on either side of the rising or falling edges of
the home switch, as shown in the following two diagrams. If the initial direction of movement
leads away from the home switch, the drive must reverse on encountering the relevant limit
switch.
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