# Hardware-in-the-Loop Simulation Model Error Issue **URL:** \ **Category:** General\ **Created:** [October 16, 2026, 1:42pm UTC](https://forum.plexim.com/t/hardware-in-the-loop-simulation-model-error-issue/3346 "2026-10-16T13:42:02Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Fish-of-Rhine](https://avatars.discourse-cdn.com/v4/letter/f/b2d939/32.png) [@Fish-of-Rhine](https://forum.plexim.com/u/Fish-of-Rhine)\ **Post date:** [October 16, 2026, 1:42pm UTC](https://forum.plexim.com/t/hardware-in-the-loop-simulation-model-error-issue/3346/1 "2026-10-16T13:42:02Z")
Dear Plexim Technical Support Team， I have built a PLECS model of a three-phase four-stage cascaded power electronic transformer (PET) for hardware-in-the-loop (HIL) simulation. However, during offline simulation, the following error message frequently appears: "Encountered 1001 consecutive zero-crossings caused by the components listed below. Count : Component 1001 : ThreephaseDAB/RT-BOX/DAB11/Configurable Subsystem/Switched/IGBTD2 Consecutive zero-crossings slow down the simulation because they force the solver to make excessively small time steps. To turn off this message, set the parameter “Max. number of consecutive zero-crossings” on the Diagnostics page of the Simulation Parameters dialog to 0." How should I adjust my model? I have another question: if I set the number of modules in the cascaded H-bridge module option to 4, how should I handle or adjust the DAB isolation stage to fulfill its original function? The PET simulation model is shown below: [ThreephaseDAB.plecs](https://forum.plexim.com/uploads/short-url/biFeeBCTfrbshsvhOOEjpgnCivV.plecs) (677.1 KB)