InverterS300Verified · sol.ls-electric.com
S300 STO Feedback A/B — STO Feedback A/B
Trip — immediate stop
CAUSE
Why does it occur?
- Occurs when the SA or SB input is not applied to the STO terminal block
- Latch/Level operation is determined by the PRT-81 (Safety Trip Mode) setting
REMEDY · Step by step
How to fix it?
If the STO terminal block SA or SB is used without separate external wiring, check that the SA/SB short bar is properly installed.
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.731 · V1.6 (2026-01-20)