InverterS300Verified · sol.ls-electric.com
S300 Input — Input Phase Open
Trip — immediate stop
CAUSE
Why does it occur?
- Occurs when one or more of the three-phase input phases is lost while operating at a load of 50% or more of the inverter rated current
- It operates only when the PRT-10 (In Phase Open Chk) code is set to 1 (Yes)
REMEDY · Step by step
How to fix it?
Check the R/S/T input power for phase loss and inspect the input wiring.
Do not reset repeatedly before identifying the cause. Repeated resets while ignoring a trip/alarm can cause secondary damage (IGBT failure, motor winding damage, etc.).
SOURCE
Related manual page
Verified · sol.ls-electric.com
Open manual ↗S300 Standard User Manual V1.6 EN (260120)
9.5 Trip/Warning List · 14장 Troubleshooting · p.728 · V1.6 (2026-01-20)