Solar Lattice

Fault codes › Canadian Solar › CSI-75/80/90/100K-T480GL02-U

Canadian Solar 75-100K-T480GL02 UN-G-V

Code
UN-G-V
Shown as
Under Grid Voltage
Page
35
ID
fc:canadian-solar-75-100k-t480gl02-ungv
IRI
https://solarlattice.org/kb/fc/canadian-solar-75-100k-t480gl02-ungv
Status
active
Also known as
UN-G-V, ungv, Canadian Solar UN-G-V, Under Grid Voltage
Category
Inverters
Class not stated
Production not stated
Clears not stated

Decoded

Reports grid undervoltage; look at voltage sensor; confirm with grid voltage measurement; do: inverter parameter adjustment, inverter replacement.

What can be behind Grid undervoltage

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

Defined in

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 W005, ABB / FIMER PVS-60-TL CODE:04, ABB / FIMER PVS-60-TL W005, ABB / FIMER TRIO-20.0-27.6-TL CODE:04, ABB / FIMER UNO-DM-3.3-5.0-PLUS CODE:04, ABB / FIMER UNO-DM-3.3-5.0-PLUS W005, ABB / FIMER UNO-DM-6.0-PLUS CODE:04, ABB / FIMER UNO-DM-6.0-PLUS W005
Canadian Solar
Canadian Solar 125K-T600GL02 UN-G-V, Canadian Solar 125KTL-GS-E UN-G-V, Canadian Solar 25-40K-T480GL01 UN-G-V, Canadian Solar 25-40KTL-GS-FL UN-G-V, Canadian Solar 50-66K-T480GL01 UN-G-V, Canadian Solar 50-66KTL-GS-FL UN-G-V
Fronius
Fronius Galvo 103, Fronius Galvo 213, Fronius Galvo 223, Fronius Primo 103, Fronius Symo 103, Fronius Symo 213, Fronius Symo 223, Fronius Symo 233
Huawei
Huawei SUN2000-100KTL-USH0 2033, Huawei SUN2000-25-30KTL-US 301, Huawei SUN2000-45KTL-US-HV-D0 301
KACO new energy
KACO new energy blueplanet TL3 111, KACO new energy blueplanet TL3 112, KACO new energy blueplanet TL3 113, KACO new energy blueplanet TL3 41, KACO new energy blueplanet TL3 43, KACO new energy blueplanet TL3 45
SMA
SMA SB-US-40 202-206, SMA SB-US-41 202, SMA SB-US-41 0203, SMA SB-US-41 206, SMA SBSE-US-50 202, SMA SBSE-US-50 0203, SMA SBSE-US-50 206, SMA STP-TL-US 202-203, SMA SC-CP-XT 0203, SMA SC-CP-XT 0204, SMA SI-US W315, SMA SI-US W316, SMA SI-US W317, SMA SI-US W318
Schneider Electric
Schneider Electric CL125 004, Schneider Electric CL125 005
Solis
Solis 1P-4G-US UN-G-V, Solis 3P-5G-US UN-G-V01/02, Solis RHI-1P-HV UN-G-V01/02, Solis S5-GC UN-G-V, Solis S6-EH1P UN-G-V01/02, Solis S6-EH2P UN-G-V01, Solis S6-EH2P UN-G-V02, Solis S6-EH3P30-60K UN-G-V01, Solis S6-EH3P30-60K UN-G-V02, Solis S6-EH3P75-150K UN-G-V01, Solis S6-EH3P75-150K UN-G-V02, Solis S6-GC UN-G-V, Solis S6-GU UN-G-V
Sungrow
Sungrow SG-CX-US 004, Sungrow SG-CX-US 005, Sungrow SG200HX 004, Sungrow SG200HX 005, Sungrow SG250HX 4, Sungrow SG250HX 5, Sungrow SG350HX 004, Sungrow SG350HX 005
Yaskawa Solectria
Yaskawa Solectria SGI-XTM Vac Low, Yaskawa Solectria SGI-XTM Vac Very Low, Yaskawa Solectria XGI-1500-1MW WARN-10, Yaskawa Solectria XGI-1500-1MW WARN-11, Yaskawa Solectria XGI-1500-1MW WARN-9, Yaskawa Solectria XGI-1500-DCG WARN-10, Yaskawa Solectria XGI-1500-DCG WARN-11, Yaskawa Solectria XGI-1500-DCG WARN-9, Yaskawa Solectria XGI-1500 WARN-10, Yaskawa Solectria XGI-1500 WARN-11, Yaskawa Solectria XGI-1500 WARN-9

Same code in other families

Claims

defined_in

c1 drafted · lead CSI Installation Manual 75-100K T480GL02-U USA V1.1 20211116

reports

c2 verified · fact Grid undervoltage

verified by: review-workflowverified on: 2026-10-23

detected_by

c3 drafted · lead Grid voltage measurement

mitigated_by

c4 drafted · lead Inverter parameter adjustment

Lower limit adjusted only with utility approval.

c6 drafted · lead Inverter replacement

Escalation after measurement and grid standard checks.

affects

c5 drafted · lead Voltage sensor

Applies when display reading disagrees with measured voltage.

applies_to

c7 drafted · lead CSI-75/80/90/100K-T480GL02-U

Data