I don’t believe that’s the case. “Enable” is the LPS’s safety (like a firearm). If not enabled, you can pull the PWM trigger and it won’t fire. It should hit the enable then PWM tells it to stay full on, full off, or modulate something in between.
But, now that I look at the prob you document, this isn’t what I was thinking- I was thinking that this is glitchy HVLPS that can fire once briefly after Enable becomes true without anything on the PWM. But that’s not there, they’re not just happening at the start.
I don’t know, I haven’t seen this. If so I’d be scoping the inputs to the HVLPS and decide if the HVLPS is actually defective or somehow the Ruida or the way the Ruida is hooked up.
I’d first make sure the HVLPS uses the same low voltage DC ground as the Ruida. This is the behavior I’d expect to see if we connect wires for Enable and PWM-Out to the HVLPS but no ground wire to the Ruida or its 24VDC supply (same thing, they’re tied together, but connection at the Ruida is more correct than connecting at the 24VDC supply).