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Table of contents
No headersThe one-line diagram is different from a schematic or wiring diagram which shows exactly which wire is connected to what component terminal pin. The one-line diagram can show the incoming power and connected load strategy for overall system operation. This type of diagram shows the big picture.
A three-phase motor load uses three wires. Each wire has its own set of series-connected poles of a breaker or fuse, starter contact, overload, terminal, and pole in a safety switch. It is not necessary to repeat this information three times on the one-line diagram. A one-line diagram shows overall logic of what happens to all three of the wires, all the way from the incoming power connection until it reaches the motor load.
The one-line symbol library consists of all the one-line symbols and is found under
- Windows XP: C:\Documents and Settings\All Users\Documents\Autodesk\Acade {version}\Libs\{library}\1-
- Windows Vista, Windows 7: C:\Users\Public\Documents\Autodesk\Acade {version}\Libs\{library}\1-
A one-line symbol can be a parent, child, or terminal. These one-line symbols use the same attributes as the schematic parent, child, and terminal symbols but with the following exceptions.
| Attribute | Description |
| WDTYPE | The attribute must be present and carry a value of "1-" to indicate it is a one-line symbol, or "1-1" for the one-line bus-tap symbols. A bus-tap symbol is used to mark the beginning of a one-line circuit. Schematic symbols do not carry this attribute or have the attribute but with a blank value. |
| RATING1 | Omitted from one-line cable markers symbols since a one-line cable marker can represent multiple conductors, multiple wires, or core color assignments. |
| TERM01 | Omitted from one-line terminal symbols since a one-line terminal can represent multiple independent terminals. If a TERM01 attribute is added to a one-line symbol and carries a non-blank value, it can be edited in the Insert/Edit Terminal Symbol dialog box. However, terminal number text on one-line terminal symbols is not linked back to terminal number assignments on schematic or panel terminal representations. Note: Terminal Strip Editor does not process one-line terminals. |
One-line symbols follow the same naming convention as schematic parent and child symbols. For convenience, the one-line symbols provided have a "1-" suffix. However, the symbol name does not define the symbol as a one-line symbol. This is defined by the WDTYPE attribute value of "1-" on the symbol, or a "1-1" on a one-line symbol.
- Motor control one-line symbols are accessible from the icon menu.
- Circuit Builder supports building motor control one-line circuits dynamically. It allows the design of one-line circuits, with component values and wire sizes, to conform to a given electrical code.
- One-line component symbols can be related to parent/child counterparts on the schematic and panel layout drawings within a project. It means that they can be Surfed together and update each other when one is modified.
- Tagging of schematic or panel components using existing commands can reference a pick list that includes components pulled from the one-line diagrams.
- Certain component and Bill of Material reports can report only one-line diagram components.
Bus-tap symbols
The bus-tap symbol can have two functions:
- Provide an anchor point for the one-line circuit representation that begins at this location.
- Break into the one-line bus where the circuit connects.
On a dual circuit one-line template, there are three bus-tap symbols. One at the normal point where the circuit ties into the bus. There is another version of the symbol on each of the two circuit "legs", each marking the point where that part of the dual circuit starts. These bus-tap symbols allow various reports to report accurately on a one-line circuit, whether a single circuit or a dual circuit representation.
The following bus-tap symbols are supplied:
- HDV1_BT_1-.dwg - with "dot" for horizontal one-line circuit
- VDV1_BT_1-.dwg - with "dot" for vertical one-line circuit
- HDV1_BTT_1-.dwg - "tee" connection for dual horizontal circuit
- VDV1_BTT_1-.dwg - "tee" connection for dual vertical circuit
- HDV1_BTL_1-.dwg - "corner" connection for dual horizontal circuit
- VDV1_BTL_1-.dwg - "corner" connection for dual vertical circuit
Note: A WDTYPE attribute with a "1-1" value, identifies a bus-tap symbol.
Comments2
- Yes but what exactly is a "one-line symbol?" How is it different from your everyday symbol?
- I added some description of what a one-line diagram is at the beginning of this topic along with an image of a one-line motor. This is just in general what makes a one-line diagram different and why it might be used.
Files1
| File | Size | Date | Attached by | |||
|---|---|---|---|---|---|---|
| one-line_motor.png No description | 22.06 kB | 09:09, 27 May 2010 | patmurnen | Actions | |
