Solar Lattice

Fault codes › ABB / FIMER › UNO-DM-3.3/3.8/4.6/5.0-TL-PLUS-US

ABB / FIMER UNO-DM-3.3-5.0-PLUS W001

Code
W001
Shown as
Sun Low
Vendor severity
Warning
Page
125
ID
fc:abb-uno-dm-3-3-5-0-plus-us-w1
IRI
https://solarlattice.org/kb/fc/abb-uno-dm-3-3-5-0-plus-us-w1
Status
active
Also known as
W001, w1, ABB / FIMER W001, Sun Low
Category
Inverters
Class warning drafted · lead
Production not stated
Clears not stated

Decoded

Reports insufficient solar irradiance, DC undervoltage; look at PV array; confirm with DC voltage measurement; do: string configuration correction.

What can be behind Insufficient solar irradiance

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

What can be behind DC 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 W001, ABB / FIMER PVS-166-175-TL W002, ABB / FIMER PVS-60-TL W001, ABB / FIMER PVS-60-TL W002, ABB / FIMER TRIO-20.0-27.6-TL W001, ABB / FIMER TRIO-20.0-27.6-TL W002, ABB / FIMER UNO-DM-3.3-5.0-PLUS W002, ABB / FIMER UNO-DM-6.0-PLUS W001, ABB / FIMER UNO-DM-6.0-PLUS W002
Fronius
Fronius Galvo 307, Fronius Primo 522, Fronius Primo 523, Fronius Symo 307, Fronius Symo 522, Fronius Symo 523
KACO new energy
KACO new energy blueplanet TL3 2
SMA
SMA SB-US-40 3901-3902, SMA SB-US-41 3301, SMA SB-US-41 3303, SMA SBSE-US-50 3302, SMA SBSE-US-50 3303, SMA STP-TL-US 3301, SMA STP-TL-US 3302, SMA STP-TL-US 3303, SMA STP-TL-US 3901-3902
Schneider Electric
Schneider Electric CL125 075
Yaskawa Solectria
Yaskawa Solectria SGI-XTM Hw Interlock

Same code in other families

Claims

defined_in

c1 drafted · lead FIMER UNO-DM-3.3-5.0-TL-PLUS-US-Q Product Manual RevB

c2 drafted · lead UNO-DM-3.3-5.0-TL-PLUS-US Product Manual RevA

has_event_class

c3 drafted · lead Warning (device continues, a condition is flagged)

from the code prefix

reports

c4 verified · fact Insufficient solar irradiance

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

c5 drafted · lead DC undervoltage

Low PV input voltage when the inverter switches on

affects

c6 drafted · lead PV array

review note: support check: partial - Cause is incorrect PV generator configuration, but the passages never say the code 'affects' the PV array as a component.

detected_by

c7 drafted · lead DC voltage measurement

Compare input voltage against Vstart

mitigated_by

c8 drafted · lead String configuration correction

If input stays below Vstart; if above Vstart, contact service

review note: support check: partial - Passages say to check the correct composition of the system if below Vstart and contact assistance if above, but do…

applies_to

c9 drafted · lead UNO-DM-3.3/3.8/4.6/5.0-TL-PLUS-US string inverter

Data