Clearance and Creepage Extension > Workflow for Performing Clearance and Creepage Analysis
Workflow for Performing Clearance and Creepage Analysis
1. Open a part or an assembly, and click Analysis > Clearance and Creepage Analysis. The Clearance and Creepage Analysis dialog box opens.
2. From the Meta Data tab, assign meta data as described below:
a. Assign a CTI value for all the parts in the assembly. The unspecified parts are automatically assigned a default value.
b. In the Part list, define the type for the part.
c. For nonhomogenous parts, assign different CTI values to the individual surfaces.
d. In the CTI Highlighting list, select Conductive (0), Isolating (>0), or Undefined (-1) to highlight parts, bodies, and surfaces that are conductive, isolating, or undefined.
3. From the Meta Data tab, you can cement insulators as described below:
a. Under Cemented Component Pairs, click Insert new cementation to select components for cementing.
b. Under Excluded Components, add components to explicitly exclude them from the analysis without deleting them from the assembly.
c. Click Apply Meta Data to automatically create a mesh.
4. From the Electric Nets tab, define electric nets as described below:
a. In the list of nets, you can change the name of the nets.
b. For each net, assign a net type and a voltage.
c. Click Auto Merge Nets to merge nets within a specified distance of one another.
d. Click Reset Selected Nets to reset the entire list to its default state.
e. Click Apply Electric Nets.
5. From the Analysis tab, set the analysis parameters as described below:
a. Select the source.
b. Specify clearance distance, creepage distance, and groove width manually or by importing a table file.
c. Click Compute All or Compute Current Source to perform the analysis.
6. From the Results tab, investigate results as described below:
a. Click Select Source to select an alternative net source.
b. Under Target Net, select a net that has failed.
c. Select a failed path.
d. Select Zoom to Start Point or Zoom to End Point to zoom to the start and end points.
e. Select the Show Involved Only check box to isolate the display of the parts affected by the failure.
7. Save data from the CCX session and then retrieve the data as described below:
a. Click Menu > Save Session As to save the CCX session data to a .ccx file in the current working directory. The session data includes the meta data, net definitions, and analysis parameters specified in the current CCX session.
b. The next time you open the assembly, click Menu > Load Session to load the CCX session data into the Clearance and Creepage Analysis dialog box. CCX compares the geometry of the assembly in session with the geometry saved in the .ccx session file. If there is a mismatch in geometry, a warning message appears and the Clearance and Creepage Analysis dialog box opens in the read-only mode.
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To reuse the same CCX parameters follow these steps:
1. Copy the ccx session file to the working directory of a new assembly and rename the file.
2. Open the assembly in Creo Parametric.
3. Load the .ccx session file, and modify the file as needed.
You should always perform a fresh analysis after an assembly update. Any change can significantly influence creepage and clearance paths. Load the .ccx session file for the assembly and specify the data for the newly added parts.
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