MagneMover LITE User Manual Addendum,
Wide Vehicles
MMI-UM034B-EN-P Page 27 of 31
Node Clearance Distances and Entry Gate Positions
Node Clearance Distances and Entry Gate positions are used on switching nodes (Merge,
Diverge, and Merge-Diverge). These anti-collision parameters define the clearance distance
for vehicles as they enter and exit the nodes and are used to avoid collisions with other
vehicles on adjoining paths.
The Node Clearance Distances define a location on the paths that are associated with a node
where the center of the vehicle (puck or tandem puck) is located. This location is such that
the trailing edge of the vehicle (including payload), regardless of vehicle movement
direction, is safely located to avoid collisions with other vehicles on adjoining paths. The
Node Clearance Distance is measured from the end of the motor closest to the node to the
center of the vehicle (puck or tandem puck).
The Entry Gate position defines a location on the paths that are associated with a node where
the center of the vehicle (puck or tandem puck) is located. This location is such that the
leading edge of the vehicle (including payload), regardless of vehicle movement direction, is
safely located to avoid collisions with other vehicles on adjoining paths. The Entry Gate
position is measured from the end of the motor closest to the node to the center of the vehicle
(puck or tandem puck). Each Entry Gate is assigned a unique ID number.
Figure 27 shows a Diverge Node in an MM LITE transport system that is configured with
entry path 1 and exit paths 2 and 3. For each of the three paths, the Node Clearance Distance
has been set the same (0.24 m). Also, for each of the three paths, the Entry Gate position has
been set the same (0.22 m) and the Configurator has assigned Gate IDs 4, 5, and 6 to the
Entry Gates. The Node Clearance Distance, which applies to all vehicles as they exit the
node, regardless of direction of travel is shown using dashed lines and arrows. The Entry
Gate position, which applies to the leading edge of each vehicle as it enters the node,
regardless of direction of travel is shown using solid lines and arrows.
NOTE: The Entry Gate position and the Node Clearance Distance are automatically
calculated when a Merge or Diverge node is configured. They must not be set to the
same value. If these positions are set the same or if the clearance distance is set
closer than the entry gate in the Configurator, then the node controller recalculates
the clearance distance so it is valid.
For best results, position one vehicle with its payload on each of the paths in the node at the
Node Clearance Distances and Entry Gate positions. Adjust the vehicle locations if necessary
to obtain satisfactory Node Clearance Distances and Entry Gate positions between the
vehicles on each path. Measure and record the Node Clearance Distance and the Entry Gate
position for each path. Then, enter the measured values in the corresponding fields within the
node configuration page.
NOTE: The full length and width of the vehicle (including payload) must be factored into
the values for each Node Clearance Distance and Entry Gate position on each path.
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