Overview The PTC Model III is designed for users wanting to solve the problem of
reliable turntable indexing. Situations where the PTC Model III will be of benefit
include:
Turntables with many lead and service tracks
Turntables where the tracks are hard to see, particularly those in corners or near
the rear of the layout, or those with dim lighting;
Layouts with high quality, highly
detailed rolling stock and bridge modeling where "hands off" indexing is preferred;
Any situation where reliable, accurate indexing will enhance layout operation and
enjoyment.
Operation
The PTC Model III (Programmable Turntable Controller) is a user
programmable turntable indexing system for use in new or existing N, HO, S, O, and
some G scale turntables. The turntable's indexing positions are programmed into
the PTC by the user, who "teaches" the PTC where the lead and service track positions
are. The PTC does not use infrared diodes, tab stops, or any mechanical methods
for indexing. Once programmed, the PTC remembers the user's track locations-- even
when the system power is turned off. During operation, the user selects the desired
lead or service track from the control panel. The PTC then automatically determines
the shortest direction of travel, simulates turntable momentum by ramping up the
bridge to a user-determined maximum speed, then ramps it down as it approaches the
desired service or lead track location. The PTC then stops the bridge at the exact
location desired, within 0.025.
The basic PTC is comprised of five primary components: the Controller, Track Selector
Module, Stepper Motor, Motor Mount Kit (optional), and Power Supply.
To fit your system to your tastes and requirements, four Track Selector Modules
are available; the standard PTC Model III is supplied with either the Rotary or
Pushbutton Track Selector:
- Rotary (Standard): indexes 12 tracks
- Pushbutton (Standard): indexes 12 tracks
- Chubb/Universal (Upgrade Option): indexes up to 24 tracks, suitable for interface
to Chubb/Computer control
- Keypad (Upgrade Option): indexes up to 99 tracks
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Features
- Fully user programmable indexing for up to 12 tracks (standard Rotary or Pushbutton
selector)
- Indexes both bridge ends
- Expandable up to 24, 48, or 99 tracks
- Track selection using rotary switch, pushbuttons, keypad, or via external computer
(e.g., Chubb)
- Very fine 0.025 indexing resolution
- Simple index programming
- Select from 14,400 possible stopping locations - not restricted to even
increments
- High torque stepper motor with internal gearing
- Quiet, smooth, slow operation
- Programmable maximum speed: 0.15 to 0.50 RPM
- Programmable momentum
- Bridge track power polarity control ("automatic track power reversing")
- Optional track power routing with the new APR Model I
A high quality clear anodized steel coupler is included with your system.
For full details about the PTC Model III and the options available, download a copy
of the Product Overview. Please visit the Downloads page of this site where all the user manuals,
application notes, and other documents are available for download.
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