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Fault codes › SMA › Sunny Central 500CP XT-1000CP XT

SMA SC-CP-XT 404

Code: 404
Page: 35
ID: fc:sma-sunny-central-cp-xt-404
IRI: https://solarlattice.org/kb/fc/sma-sunny-central-cp-xt-404
Status: active
Also known as: 404, SMA 404
Category: Inverters

Class fault drafted · lead

Production stops drafted · lead

Clears by itself drafted · lead

Decoded

Reports islanding detected, grid instability; confirm with grid frequency measurement; do: utility company consultation.

What can be behind Islanding detected

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

What can be behind Grid instability

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

Incorrect or unset grid code drafted · lead

Defined in

SCCPXT-E7-WA-en-37 — SMA · page 35 drafted · lead
- tbl=33.r1 h=af5b72b20eed

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 W015, ABB / FIMER PVS-166-175-TL W003, ABB / FIMER PVS-60-TL CODE:03, ABB / FIMER PVS-60-TL W015, ABB / FIMER PVS-60-TL W003, ABB / FIMER TRIO-20.0-27.6-TL CODE:03, ABB / FIMER TRIO-20.0-27.6-TL W003, ABB / FIMER UNO-DM-3.3-5.0-PLUS CODE:03, ABB / FIMER UNO-DM-3.3-5.0-PLUS W015, ABB / FIMER UNO-DM-3.3-5.0-PLUS W003, ABB / FIMER UNO-DM-6.0-PLUS CODE:03, ABB / FIMER UNO-DM-6.0-PLUS W015, ABB / FIMER UNO-DM-6.0-PLUS W003
Canadian Solar: Canadian Solar 125K-T600GL02 GRID-INTF, Canadian Solar 125KTL-GS-E GRID-INTF, Canadian Solar 185-255K GRID-INTF01/02, Canadian Solar 25-40K-T480GL01 GRID-INTF, Canadian Solar 25-40KTL-GS-FL GRID-INTF, Canadian Solar 50-66K-T480GL01 GRID-INTF, Canadian Solar 50-66KTL-GS-FL GRID-INTF, Canadian Solar 75-100K-T480GL02 GRID-INTF
Fronius: Fronius Galvo 108, Fronius Primo 108, Fronius Symo 108
Huawei: Huawei SUN2000-100KTL-USH0 2038
SMA: SMA SB-US-40 401-404, SMA SB-US-41 401, SMA SB-US-41 404, SMA SBSE-US-50 401, SMA SBSE-US-50 404, SMA CORE1-US 401, SMA STP-TL-US 401, SMA STP-TL-US 404, SMA STP-X-US 401, SMA STP-X-US 404, SMA SC-CP-XT 0506, SMA SI-US W331, SMA SI-US W332, SMA SI-US W333, SMA SI-US W334
Schneider Electric: Schneider Electric CL125 010
Solis: Solis 1P-4G-US GRID-INTF, Solis 3P-5G-US GRID-INTF01/02, Solis RHI-1P-HV GRID-INTF01/02, Solis S5-GC GRID-INTF, Solis S6-EH1P GRID-INTF01/02, Solis S6-EH2P G-F-GLU, Solis S6-EH2P GRID-INTF, Solis S6-EH2P GRID-INTF02, Solis S6-EH3P30-60K G-F-GLU, Solis S6-EH3P30-60K GRID-INTF, Solis S6-EH3P30-60K GRID-INTF02, Solis S6-EH3P75-150K G-F-GLU, Solis S6-EH3P75-150K GRID-INTF, Solis S6-EH3P75-150K GRID-INTF02, Solis S6-GC GRID-INTF, Solis S6-GU GRID-INTF
Yaskawa Solectria: Yaskawa Solectria XGI-1500-1MW WARN-3, Yaskawa Solectria XGI-1500-DCG WARN-3, Yaskawa Solectria XGI-1500 WARN-3

Same code in other families

Claims

`defined_in`

c1 drafted · lead SCCPXT-E7-WA-en-37

SCCPXT-E7-WA-en-37 tbl=33.r1 h=af5b72b20eed

`reports`

c2 drafted · lead Islanding detected

SBxx-US-1XP-41-BA-en-12 sec=h229 h=f714a156b3c4
SBSExx-US-50-BE-en-11 sec=h474 h=f714a156b3c4
STPxx-US-50-BE-en-14 sec=h408 h=f714a156b3c4

c3 drafted · lead Grid instability

Very large or too fast change of grid frequency.

SCCPXT-E7-WA-en-37 tbl=33.r1 h=af5b72b20eed
SBxx-US-1XP-41-BA-en-12 sec=h229 h=f714a156b3c4
SBSExx-US-50-BE-en-11 sec=h474 h=f714a156b3c4
STPxx-US-50-BE-en-14 sec=h408 h=f714a156b3c4

`detected_by`

c4 verified · fact Grid frequency measurement

SBxx-US-1XP-41-BA-en-12 sec=h230 h=a59ad34e5713
SBSExx-US-50-BE-en-11 sec=h475 h=a59ad34e5713
STPxx-US-50-BE-en-14 sec=h409 h=a59ad34e5713

verified by: review-workflowverified on: 2026-10-23review note: support check: partial - The passages only mention checking for frequency fluctuations, and the detection method is implied rather than stated.

`mitigated_by`

c5 drafted · lead Utility company consultation

Contact grid operator if an outage or grid work is suspected.

SBxx-US-1XP-41-BA-en-12 sec=h230 h=a59ad34e5713
SBSExx-US-50-BE-en-11 sec=h475 h=a59ad34e5713
STPxx-US-50-BE-en-14 sec=h409 h=a59ad34e5713

`has_event_class`

c6 drafted · lead Fault (device stops or needs intervention)

STPTL-US-10-IA-xx-22 tbl=13.r3 h=9b5f0abed84a
SBxx-US-1XP-41-BA-en-12 sec=h229 h=f714a156b3c4

review note: support check: partial - It is called a grid fault where the inverter stopped feeding in, which is a trip; a fault classification is…

`has_production_effect`

c7 drafted · lead Trip (production stops)

STPTL-US-10-IA-xx-22 tbl=13.r3 h=9b5f0abed84a
SBxx-US-1XP-41-BA-en-12 sec=h229 h=f714a156b3c4
SBSExx-US-50-BE-en-11 sec=h474 h=f714a156b3c4
STPxx-US-50-BE-en-14 sec=h408 h=f714a156b3c4

`has_recovery`

c8 drafted · lead Auto-reset (clears by itself)

Reconnects after grid monitoring time; depending on parameterization may need manual acknowledgement.

SCCPXT-E7-WA-en-37 tbl=33.r1 h=af5b72b20eed
SCCPXT-E7-WA-en-37 sec=5.4.3 h=162f559707eb

`applies_to`

c9 drafted · lead Sunny Central CP XT

SCCPXT-E7-WA-en-37 tbl=33.r1 h=af5b72b20eed

Data