Fault codes › CPS › CPS SCH200K-T-US-480 / SCH250K-T-US-600

CPS SCH200-250K-T Protect0300

Code: Protect0300
Shown as: Bus over voltage firmware
Vendor severity: Protection
Page: 105
ID: fc:chint-sch-200-250k-t-protect300
IRI: https://solarlattice.org/kb/fc/chint-sch-200-250k-t-protect300
Status: active
Also known as: Protect0300, protect300, CPS Protect0300, Bus over voltage firmware
Category: Inverters

Class fault drafted · lead

Production not stated

Clears by itself drafted · lead

Decoded

Reports DC bus overvoltage; do: inverter restart, inverter replacement, contact manufacturer service.

What can be behind DC bus overvoltage

Failure modes that present as the reported condition, and the tests that tell them apart.

Defined in

CPS SCH200-250K-T-US User Manual Aug 2026 — CPS (Chint Power Systems) · page 105 drafted · lead
- tbl=42.r5 h=f3ad5d61de4e

The manufacturer's own cause and corrective text is not reproduced here.

Same condition on other equipment

ABB / FIMER: ABB / FIMER PVS-166-175-TL E029, ABB / FIMER PVS-166-175-TL E004, ABB / FIMER PVS-60-TL E029, ABB / FIMER PVS-60-TL E004, ABB / FIMER TRIO-20.0-27.6-TL E029, ABB / FIMER TRIO-20.0-27.6-TL E004, ABB / FIMER UNO-DM-3.3-5.0-PLUS E029, ABB / FIMER UNO-DM-3.3-5.0-PLUS E004, ABB / FIMER UNO-DM-6.0-PLUS E029, ABB / FIMER UNO-DM-6.0-PLUS E004
CPS: CPS SCA25KTL-208 Fault0130, CPS SCA25KTL-208 Fault0020, CPS SCA25KTL-208 Protect0110, CPS SCA25KTL-208 Protect0090, CPS SCA25KTL-480 Fault0130, CPS SCA25KTL-480 Fault0020, CPS SCA25KTL-480 Protect0110, CPS SCA25KTL-480 Protect0090, CPS SCA50-100K-T Fault7000, CPS SCA50-100K-T PFault0000, CPS SCA50-100K-T PFault0110, CPS SCA50-100K-T Protect0000, CPS SCA50-100K-T Protect0110, CPS SCA50-100K-T Protect0300, CPS SCA50-100K-T Protect0090, CPS SCH100-125KTL Fault0130, CPS SCH100-125KTL Fault0020, CPS SCH100-125KTL Protect0110, CPS SCH100-125KTL Protect0090, CPS SCH125KTL-AIO Fault0130, CPS SCH125KTL-AIO Fault0020, CPS SCH125KTL-AIO Protect0110, CPS SCH125KTL-AIO Protect0090, CPS SCH200-250K-T Fault0130, CPS SCH200-250K-T Fault0030, CPS SCH200-250K-T Protect0000, CPS SCH275KTL Fault0130, CPS SCH275KTL Fault0020, CPS SCH275KTL Protect0110, CPS SCH275KTL Protect0090, CPS SCH350KTL Fault0130, CPS SCH350KTL Fault0020, CPS SCH350KTL Protect0110, CPS SCH350KTL Protect0090
Canadian Solar: Canadian Solar 125K-T600GL02 OV-BUS, Canadian Solar 125KTL-GS-E OV-BUS, Canadian Solar 185-255K OV-BUS, Canadian Solar 25-40K-T480GL01 OV-BUS, Canadian Solar 25-40KTL-GS-FL OV-BUS, Canadian Solar 50-66K-T480GL01 OV-BUS, Canadian Solar 50-66KTL-GS-FL OV-BUS, Canadian Solar 75-100K-T480GL02 OV-BUS
Fronius: Fronius Galvo 308, Fronius Primo 489, Fronius Symo 308, Fronius Symo 489
KACO new energy: KACO new energy blueplanet TL3 216, KACO new energy blueplanet TL3 35, KACO new energy blueplanet TL3 85
SMA: SMA STP-X-US 6405, SMA SC-CP-XT 6405
Schneider Electric: Schneider Electric CL125 019, Schneider Electric CL125 020
Solis: Solis 1P-4G-US OV-BUS, Solis 3P-5G-US OV-BUS, Solis RHI-1P-HV OV-BUS, Solis S5-GC OV-BUS, Solis S6-EH1P OV-BUS, Solis S6-EH2P OV-BUS, Solis S6-EH2P OV-BUS-H, Solis S6-EH3P30-60K OV-BUS, Solis S6-EH3P30-60K OV-BUS-H, Solis S6-EH3P75-150K OV-BUS, Solis S6-EH3P75-150K OV-BUS-H, Solis S6-GC OV-BUS, Solis S6-GU OV-BUS
Yaskawa Solectria: Yaskawa Solectria PVI-25TL-R Fault0130, Yaskawa Solectria PVI-25TL-R Fault0020, Yaskawa Solectria PVI-25TL-R Protect0110, Yaskawa Solectria SGI-XTM DC Overshoot

Same code in other families

CPS SCA50-100K-T Protect0300

Claims

`defined_in`

c1 drafted · lead CPS SCH200-250K-T-US User Manual Aug 2026

CPS SCH200-250K-T-US User Manual Aug 2026 tbl=42.r5 h=f3ad5d61de4e

`has_event_class`

c2 drafted · lead Fault (device stops or needs intervention)

from the code prefix

CPS SCH200-250K-T-US User Manual Aug 2026 tbl=42.r5 h=f3ad5d61de4e

`reports`

c3 drafted · lead DC bus overvoltage

CPS SCA100K-T-US-480 SCA50K-T-US-208 User Manual Rev 1.0 tbl=54.r4 h=095a9c6afb69
CPS SCH200-250K-T-US User Manual Aug 2026 tbl=42.r5 h=f3ad5d61de4e

`has_recovery`

c4 drafted · lead Auto-reset (clears by itself)

Observe first; then restart; persistent case needs service or inverter replacement.

CPS SCA100K-T-US-480 SCA50K-T-US-208 User Manual Rev 1.0 tbl=54.r4 h=095a9c6afb69

review note: support check: partial - u16 supports observe then restart then service, but the inverter replacement part of the note is only in u17, which…