A plug-in or bar current transformer is a special device which serves to measure the primary current in a conductor without cutting through the conductor. A connection runs through such a device without a connection point of the device being connected to this connection.
Connection point logic
In order for such devices to be configured in EPLAN, the "Mechanical feedthrough" option is available in the dialog Connection point logic for the Connection point type property. The connection is routed through the device with two connection points of this connection point type in the connection point logic. To this purpose a connection point with the same connection point type must be entered in the Transfer potential to property for a connection point with this connection point type. The Number of targets property must be "1".
The function definition "Current transformer, inductive" is available exactly for this connection point logic so that you do not have to set the listed conditions manually at each affected device.
For the display of current transformers with mechanical feedthrough, the standard symbol libraries contain some symbols (LSW1C, LSW2C, LSW3C) for which this function definition is already preset.
You can use the check run 007035 from the message class 007 "Devices" to review the settings in the connection point logic for mechanical feedthroughs. This check run reports connection points with the connection point type "Mechanical feedthrough" that do not have a valid counterpiece or whose number of targets is not "1".
Connection properties
The following two properties are used to identify connections that run through a mechanical feedthrough:
- Routed mechanical feedthroughs (ID 31164)
- Mechanical feedthroughs available (ID 31165)
These properties can be used as columns in the connections navigator, for output in reports, for filtering, etc. The output information is intended for users who wire an enclosure on the basis of a wiring list and do not use EPLAN Smart Wiring.
Routing of routing connections
When routing routing connections in the layout space, connections that pass through items with a mechanical feedthrough receive special treatment. Routing paths are generated for these items that have the same designation as the item through which the connection is routed. In such a case the DT of the item with the feedthrough is also listed in addition to the other routing paths (for example for cable ducts) in the property Layout space: Routing track. This information is required by EPLAN Smart Wiring.
The two properties Routed mechanical feedthroughs (ID 31164) and Mechanical feedthroughs available (ID 31165) also exist at 3D connections and are filled with values.
During the routing of connections for items with mechanical feedthrough, various problems can occur which mean that the connections cannot be routed. The following check runs are available in the message class 026 "3D mounting layout" to eliminate these problems:
- The check run 026108 checks whether a suitable connection point pattern exists for an item with mechanical feedthrough.
- The check run 026109 checks whether an associated 3D part placement exists in the layout space for a multi-line item with mechanical feedthrough in the schematic.
- The check run 026110 determines that no entry point into the routing path network was found for a specific connection point of the mechanical feedthrough.
In such a case - connections not routed - the message 026043 is output in addition to the messages listed above ("No routing track between source and target found"). For items with a mechanical feedthrough, this message is supplemented with an addition for mechanical feedthroughs.
See also