Mtroniks and regen braking

Our attention has been drawn to an issue that can arise when using an Mtronics sound card with a controller that has regenerative braking [all 4QD controllers]. The model in this case was the Mtroniks Digi Sound 602 Class 08.

After discussion with Mtroniks the diagnosis is that the problem is due to providing the power for the sound card from the 12V point on the main traction battery. Mtroniks recommend that their sound systems are supplied from a separate 12V battery. The reason for this is that the current through the battery pair can be subject to high frequency noise, which can cause malfunctioning of the sound card.