Under the fail help, fail type 7 is determined as "Fails as no I2t data is available for the devices, assume a failure by default".
I assume that the I2t data for the specific devices is not present in the data file for that particular device, in this instance Schneider Mirologic ACB's.
With no I2t data the calculation defaults to unlimited energy let through, which then fails the k2s2 > I2t test.
As such I'm left with a failure on the main supply where I'm using Schenider ACB's on both the LV supply (in this case an outgoing transformer) and on the incoming side of the main panel board.
Using the generic ACB on the LV feeder overcomes the issues, but then gives me a discrimination problem with the down stream Schneider ACB.
Why is the I2t data not included in the calculation? And how do I overcome the issues?
Can I have a response please?
Hi Stuart, I am discussing this with product management this afternoon and will get back to you with further details.
Shane Regan | Principle Building Performance Support EngineerHevacomp to OpenBuildings - A complete guide for every user | Bentley Communities
Shane,
I need a resolution to this please. What was the outcome of your meeting?
Hi Stuart,We reviewed this and will look into the lack of I2T data for Schneider devices but that doesn't resolve your issue in the short term. My suggestion is to use the Generic ACB's as these have I2T data. You should be able to match the characteristic curve of any of the Schneider ACB's quite closely to give you the required settings. Try the Device Overlay option to check this.
If you still have problems we may need to see your project.
Steve Brown | Bentley Systems