SpeedVal Kit 3phase-board：SCP triggered when switching on upper device

HansJ

Dear all,

I’m currently using the following products for my research project:

MOD-MB-3P-0900V-40A-N

EVAL-ADUM4146WHB1Z

MOD-PWR-MM-C3M0032120K

I didn’t use the control card — instead, I generate the PWM signals externally.

In my setup, I only need to produce a single voltage pulse. However, I’ve observed something strange:

—When I use the upper device evaluation configuration and switch on the upper device, the gate driver’s red LED turns on, indicating an SCP (short-circuit protection) event.

—When I use the lower device evaluation configuration and switch on the lower device, no SCP error occurs.

I would like to understand why SCP is triggered only when switching the upper device. Could this be related to the measurement configuration, gate driver reference, or bootstrap/isolated supply setup?

Any suggestions or explanations would be greatly appreciated. Thank you very much!

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