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Fault codes › Solis › Solis S6-EH3P(30-60)K-NV-YD-H-US

Solis S6-EH3P30-60K UNB-BUS

Code
UNB-BUS
Shown as
DC bus unbalanced voltage
Page
93
ID
fc:solis-s6-eh3p-30-60k-us-unbbus
IRI
https://solarlattice.org/kb/fc/solis-s6-eh3p-30-60k-us-unbbus
Status
active
Also known as
UNB-BUS, unbbus, Solis UNB-BUS, DC bus unbalanced voltage
Category
Inverters
Class fault drafted · lead
Production not stated
Clears after a manual reset drafted · lead

Decoded

Reports neutral point voltage imbalance; do: inverter restart.

What can be behind Neutral point voltage imbalance

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

CPS
CPS SCA25KTL-208 Fault0110, CPS SCA25KTL-208 Protect0070, CPS SCA25KTL-480 Fault0110, CPS SCA25KTL-480 Protect0070, CPS SCA50-100K-T Fault4010, CPS SCA50-100K-T PFault0020, CPS SCA50-100K-T Protect0070, CPS SCH100-125KTL Fault0110, CPS SCH100-125KTL Protect0070, CPS SCH125KTL-AIO Fault0110, CPS SCH125KTL-AIO Protect0070, CPS SCH275KTL Fault0110, CPS SCH275KTL Protect0070, CPS SCH350KTL Fault0110, CPS SCH350KTL Protect0070
KACO new energy
KACO new energy blueplanet TL3 86
Schneider Electric
Schneider Electric CL125 024, Schneider Electric CL125 025
Solis
Solis S6-EH2P UNB-BUS, Solis S6-EH3P75-150K UNB-BUS
Yaskawa Solectria
Yaskawa Solectria PVI-25TL-R Fault0110, Yaskawa Solectria PVI-25TL-R Protect0070

Same code in other families

Claims

defined_in

c1 drafted · lead Solis_Manual_S6-EH3P(30-60)K-NV-YD-H-US(21A)_V1_0_20260908

c2 drafted · lead Solis_Manual_S6-EH3P(30-60)K-NV-YD-H-US(21A)_V1.0_20251202

reports

c3 verified · fact Neutral point voltage imbalance

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

mitigated_by

c4 drafted · lead Inverter restart

has_event_class

c5 drafted · lead Fault (device stops or needs intervention)

review note: support check: partial - Fault class not explicit; implied by 'confirm that the fault continues'.

has_recovery

c6 drafted · lead Manual reset (operator restarts or acknowledges)

applies_to

c7 drafted · lead Solis S6-EH3P(30-60)K-NV-YD-H-US

Data