6
Task: Include Multi-bus Wiring, Connectors, and Rearranging Circuits
This sample drawing shows a partially completed variable speed drive. The task is to 1) connect the three-phase power wiring to
the drive representation through a set of terminals, 2) wire up the remaining control connections through a plug / receptacle
connector symbol, 3) come back in and add a current transformer to one phase of the power wiring and wire through two new
pins added to the connector, 4) assume that when a wire crosses another, a small gap needs to be shown in one of the crossing
wires. To make it easier for basic AutoCAD, we’ll assume that the connector symbol exists in a block library and can be quickly
inserted when needed.
Steps
1. Draw the three-phase power wiring from the disconnecting means and route
it down, over, and up to connect into the upper left-hand power connection
of the drive symbol.
2. Draw wires from two upper and seven lower terminals over to a newly inserted
connector symbol positioned along the right-hand side of the drawing.
3. Adjust all wire crossings to show a small gap in one of the
crossing wires.
4. Now assume that the customer requests an engineering change to add a
current transformer in the middle phase of the power connection. Widen the
spacing between the bus wires in order
to insert a current transformer.
Study Results
The advantage of using AutoCAD Electrical becomes apparent, even for these simple drafting tasks. The Multiple Wire Bus
command senses connection points and spacing automatically and makes nicely synchronized turns. Wires that cross other
wires can trigger automatic gap insertions. The AutoCAD Electrical parametric connector tool automatically adjusts to the wire
connection spacing. The “Scoot” command for moving/stretching existing wiring, components, and such is just plain cool. Using
AutoCAD took 8 times as long , resulting in an
85% times savings.
Advantages of AutoCAD Electrical
• “Intelligent” point-to-point wiring tools.
• Wires automatically connect to smart component wire connection points, no “SNAP” mode required.
• Connectors align with underlying wiring.
• “Scoot” command enables quick adjustments to wire and component positions.
5.
Electrical-Specific Drafting Features
Productivity Gain* AutoCAD AutoCAD Electrical
Number of Commands Utilized 4 5
Number of Times Commands Were Accessed 30 8
Total Number of User Picks, Clicks, Keystrokes 165 61
Total Time to Complete Task (minutes, seconds) 8:07 1:13
Time Saving with AutoCAD Electrical — 85%
Slash design time by using commands designed specifically for electrical controls
designers. Specialized features such as trim wire, copy and delete component or
circuit, and scoot and align components make it much easier
to create drawings quickly.
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