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 17.2.2.2 Maintenance. Clean track is essential if the system is to be kept operating. The
inspector should examine the track to see that housekeeping is being done. He/she should also
check the condition of the power and logic rails to see that they are clean and free of oxidation.
The track environment should control the frequency and intensity of this examination. Areas
subject to dust and dirt should be checked more often than a sterile area. Electrical and
mechanical connections should be checked, especially in areas subject to vibration, such as track
going into and away from switch track. The gear rack on vertical track should be closely
examined. This rack calories the weight of the modules as they move vertically and are subject
to wear. It is not necessary to replace the track section if the rack is wearing. The racks are
modularly constructed for replacement purposes. Tracks in public areas should be closely
examined for sharp edges. They should also be checked for damage. Any piece of equipment
that is exposed to people is subject to damage.
17.2.3 Switches
Because of the mechanical movement, switches sustain the most wear of any part in the
system. The inspector should closely examine them for wear and ascertain that proper types and
amounts of lubrication are being used. Any wear should be noted so that repairs can be made
prior to system shutdowns. Associated with the switches are the destination readers. Since
switches are decision points, readers are located near the switches to determine the path of the
module. Operation of the readers should be checked to assure proper information is received and
associated action occurs. Figures 17-5, 17-6 and 17-7 show various switch arrangements that
will be encountered. Switches can be located in the horizontal or vertical plane.
17.2.4 Dispatching And Receiving Stations
There are numerous arrangements for dispatching and receiving stations. Figure 17-8 shows
several typical arrangements. However, most stations are designed to meet specific applications.
Because these areas are accessible to the public, the inspector must pay specific attention to the
general hazards such as sharp edges, exposed electrical devices etc., in addition to his system
concerns, which include the condition of the track and switching devices. These stations will
contain a dispatch or send a control unit. The inspector should mechanically check the
pushbutton operation as well as the electrical operation.
17-7
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