Power
Motion Labs 400A Distro troubleshooting
The Motion Labs 400A Distro problems live-event techs bring to Ask Roadie most. Pick your symptom, or describe your own in plain words, and get the likeliest fix first, with the manual page when there is one.
Common 400A Distro errors & problems
What techs run into most, and what's usually behind it. The step-by-step fix for your exact unit is in Ask Roadie.
- Step-by-step fixGet the fix →
Circuits behave erratically / a GFCI trips instantly when a shared (borrowed) neutral is used
Likely cause: A GFCI measures hot-vs-neutral current balance; routing the return current through a different circuit's neutral guarantees an imbalance and an instant trip.
- Step-by-step fixGet the fix →
GFCI Edison circuit nuisance-trips under a full rig of LED fixtures/dimmers with no real fault
Likely cause: Cumulative capacitive leakage from many switch-mode LED drivers exceeds the ~5mA GFCI trip threshold even with no fault; splitting the load keeps per-circuit leakage under threshold.
- Step-by-step fixGet the fix →
Main breaker trips or one phase runs hot while others are light
Likely cause: A Wye main sees per-phase current; one heavy phase reaches the trip point while the box total looks fine.
- Step-by-step fixGet the fix →
Neutral overheating or elevated neutral current on the distro
Likely cause: Third-harmonic currents from non-linear show loads are additive in the shared neutral rather than cancelling.
- Step-by-step fixGet the fix →
Physical specs and enclosure of the Motion Labs stackable distro
Likely cause: Cam In/Thru lets you pass 400A feeder through to the next distro so power scales without re-landing lugs.
- Step-by-step fixGet the fix →
How 120V vs 208V come off the same L21-30 / three-phase output
Likely cause: Wye topology gives both voltages from one 5-wire feed, which is why one distro feeds both Edison (120V) and 208V gear.
- Step-by-step fixGet the fix →
Digital meter reads zero / no display on a metered unit
Likely cause: The meter is an instrument fed separately from the power bus; it can fail while distribution is unaffected.
Not on the list? Describe it your way, or paste the error code off the display. Ask Roadie works the problem with you until it's fixed or you have a clear next move.
How Ask Roadie helps with the 400A Distro
- 1. Pick the Motion Labs 400A Distro. It's already in the list.
- 2. Describe what you're seeing. In your own words, or the error code off the screen.
- 3. Get the likeliest fix first. Steps in order, the manual page when there is one, and a note when other techs have confirmed it.
- 4. Still broken? Tap 👎 and it keeps going from where you left off.
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