Fault codes › CPS › CPS SCH275KTL-DO/US-800

CPS SCH275KTL IsolationErr

Code: IsolationErr
Shown as: insulation resistance low
Vendor severity: Protection
Page: 72
ID: fc:chint-sch-275ktl-isolationerr
IRI: https://solarlattice.org/kb/fc/chint-sch-275ktl-isolationerr
Status: active
Also known as: IsolationErr, isolationerr, CPS IsolationErr, insulation resistance low
Category: Inverters

Class fault drafted · lead

Production not stated

Clears not stated

Decoded

Reports low insulation resistance; look at PV array, DC cable; confirm with fault localization; do: DC wiring check, inverter parameter adjustment.

What can be behind Low insulation resistance

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

Defined in

CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 — CPS (Chint Power Systems) · page 72 drafted · lead
- tbl=27.r14 h=6097f6c3cfa2
- tbl=27.r15 h=7449fd187fa6
- tbl=27.r16 h=1ac7d007f121
- tbl=27.r17 h=0049cd36947f
- tbl=27.r18 h=2086e621c3f7
- tbl=27.r19 h=2dd4d412445e

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 E025, ABB / FIMER PVS-166-175-TL E037, ABB / FIMER PVS-60-TL E025, ABB / FIMER PVS-60-TL E037, ABB / FIMER TRIO-20.0-27.6-TL E025, ABB / FIMER TRIO-20.0-27.6-TL E037, ABB / FIMER UNO-DM-3.3-5.0-PLUS E025, ABB / FIMER UNO-DM-6.0-PLUS E025
CPS: CPS SCA25KTL-208 IsolationErr, CPS SCA25KTL-480 IsolationErr, CPS SCA36KTL IsolationErr, CPS SCA50-100K-T Protect0190, CPS SCA50-60KTL IsolationErr, CPS SCH100-125KTL IsolationErr, CPS SCH125KTL-AIO IsolationErr, CPS SCH200-250K-T IsolationErr, CPS SCH350KTL IsolationErr
Canadian Solar: Canadian Solar 125K-T600GL02 PV ISO-PRO 01/02, Canadian Solar 125K-T600GL02 PV-MID-ISO, Canadian Solar 185-255K PV ISO-PRO 01/02, Canadian Solar 23-28KTL-CT IsolationErr, Canadian Solar 25-40K-T480GL01 PV ISO-PRO 01/02, Canadian Solar 50-66K-T480GL01 PV ISO-PRO 01/02, Canadian Solar 75-100K-T480GL02 PV ISO-PRO 01/02
Enphase: Enphase IQ7 DC Resistance Low - Power Off, Enphase IQ8 DC Resistance Low - Power Off, Enphase IQ9N DC Resistance Low - Power Off, Enphase M215-M250 DC Resistance Low - Power Off
Fronius: Fronius Galvo 502, Fronius Primo 447, Fronius Primo 502, Fronius Symo 447, Fronius Symo 502
Huawei: Huawei SUN2000-100KTL-USH0 2062, Huawei SUN2000-25-30KTL-US 313, Huawei SUN2000-45KTL-US-HV-D0 313
KACO new energy: KACO new energy blueplanet TL3 181, KACO new energy blueplanet TL3 182, KACO new energy blueplanet TL3 183
SMA: SMA SB-US-40 3501, SMA SB-US-41 3501, SMA SBSE-US-50 3501, SMA PEAK3-US 3501, SMA CORE1-US 3501, SMA STP-TL-US 3501, SMA STP-X-US 3501, SMA SC-CP-XT 3501, SMA SC-CP-XT 3504, SMA SC-CP-XT 3510, SMA SC-CP-XT 3511
Schneider Electric: Schneider Electric CL125 039, Schneider Electric CL125 055
Solis: Solis 1P-4G-US PV ISO-PRO 01/02, Solis 3P-5G-US PV ISO-PRO 01/02, Solis RHI-1P-HV PV ISO-PRO 01/02, Solis S5-GC PV ISO-PRO 01/02, Solis S6-EH1P PV ISO-PRO 01/02, Solis S6-GC PV ISO-PRO 01/02, Solis S6-GU PV ISO-PRO 01/02
Sungrow: Sungrow SG-CX-US 039, Sungrow SG200HX 039, Sungrow SG250HX 39, Sungrow SG350HX 039
Yaskawa Solectria: Yaskawa Solectria PVI-25TL-R IsolationErr, Yaskawa Solectria PVI-TL IsolationErr

Same code in other families

Claims

`defined_in`

c1 drafted · lead CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7

CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r14 h=6097f6c3cfa2
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r15 h=7449fd187fa6
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r16 h=1ac7d007f121
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r17 h=0049cd36947f
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r18 h=2086e621c3f7
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r19 h=2dd4d412445e

`has_event_class`

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

from the table header

CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r14 h=6097f6c3cfa2
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r15 h=7449fd187fa6
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r16 h=1ac7d007f121
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r17 h=0049cd36947f
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r18 h=2086e621c3f7
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r19 h=2dd4d412445e
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27 h=645c5466b9b0

`reports`

c3 drafted · lead Low insulation resistance

CPS SCH100-125KTL-DO-US-600-480 User Manual Rev 1.9 tbl=36.r8 h=acaf4adf7562
CPS SCA25KTL-DO-US-208 User Manual Rev 1.2 tbl=51.r1 h=ef57cb62b84d
CPS 25kW User Manual Rev 2.1 tbl=58.r2 h=81c46507b9b5
CPS SCH125KTL-AIO-US-600 Sep 2020 tbl=32.r2 h=064a742016b1
CPS SCH200-250K-T-US User Manual Aug 2026 tbl=42.r7 h=bcf81b9b362d
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r14 h=6097f6c3cfa2
CPS SCH350KTL-DO-US-800 User Manual Rev 2.2 tbl=35.r3 h=91fe203f5279

`affects`

c4 drafted · lead PV array

CPS SCH100-125KTL-DO-US-600-480 User Manual Rev 1.9 tbl=36.r8 h=acaf4adf7562
CPS SCA25KTL-DO-US-208 User Manual Rev 1.2 tbl=51.r1 h=ef57cb62b84d
CPS 25kW User Manual Rev 2.1 tbl=58.r2 h=81c46507b9b5
CPS SCH125KTL-AIO-US-600 Sep 2020 tbl=32.r2 h=064a742016b1
CPS SCH200-250K-T-US User Manual Aug 2026 tbl=42.r7 h=bcf81b9b362d
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r18 h=2086e621c3f7
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r19 h=2dd4d412445e

c5 drafted · lead DC cable

CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r19 h=2dd4d412445e
CPS SCA25KTL-DO-US-208 User Manual Rev 1.2 tbl=51.r1 h=ef57cb62b84d
CPS 25kW User Manual Rev 2.1 tbl=58.r2 h=81c46507b9b5
CPS SCH125KTL-AIO-US-600 Sep 2020 tbl=32.r2 h=064a742016b1
CPS SCH200-250K-T-US User Manual Aug 2026 tbl=42.r7 h=bcf81b9b362d

review note: support check: partial - Passages say to trace the wiring of the faulted string for leakage, but a DC cable is not named explicitly.

`detected_by`

c6 drafted · lead Fault localization

CPS SCH100-125KTL-DO-US-600-480 User Manual Rev 1.9 tbl=36.r8 h=acaf4adf7562
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r15 h=7449fd187fa6
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r16 h=1ac7d007f121
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r17 h=0049cd36947f
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r18 h=2086e621c3f7
CPS 25kW User Manual Rev 2.1 tbl=58.r2 h=81c46507b9b5
CPS SCH125KTL-AIO-US-600 Sep 2020 tbl=32.r2 h=064a742016b1
CPS SCH200-250K-T-US User Manual Aug 2026 tbl=42.r7 h=bcf81b9b362d

`mitigated_by`

c7 drafted · lead DC wiring check

CPS SCA25KTL-DO-US-208 User Manual Rev 1.2 tbl=51.r1 h=ef57cb62b84d
CPS 25kW User Manual Rev 2.1 tbl=58.r2 h=81c46507b9b5
CPS SCH125KTL-AIO-US-600 Sep 2020 tbl=32.r2 h=064a742016b1
CPS SCH200-250K-T-US User Manual Aug 2026 tbl=42.r7 h=bcf81b9b362d
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r19 h=2dd4d412445e
CPS SCH350KTL-DO-US-800 User Manual Rev 2.2 tbl=35.r3 h=91fe203f5279

c8 drafted · lead Inverter parameter adjustment

Insulation resistance threshold parameter may be adjusted as a last step.

CPS SCA25KTL-DO-US-208 User Manual Rev 1.2 tbl=51.r1 h=ef57cb62b84d
CPS 25kW User Manual Rev 2.1 tbl=58.r2 h=81c46507b9b5
CPS SCH125KTL-AIO-US-600 Sep 2020 tbl=32.r2 h=064a742016b1

review note: support check: partial - The ISOResist parameter can be adjusted, but 'last step' ordering and 'threshold' are only implied by its position as item 6.

`applies_to`

c9 drafted · lead CPS SCH275KTL-DO/US-800

CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r14 h=6097f6c3cfa2
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r15 h=7449fd187fa6
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r16 h=1ac7d007f121
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r17 h=0049cd36947f
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r18 h=2086e621c3f7
CPS SCH275KTL-DO-US-800 V2 User Manual Rev 1.7 tbl=27.r19 h=2dd4d412445e

CPS SCH275KTL IsolationErr

Decoded

What can be behind Low insulation resistance

Defined in

Same condition on other equipment

Same code in other families

Claims

defined_in

has_event_class

reports

affects

detected_by

mitigated_by

applies_to

Data