The error messages K1-Open / K2-Open and K1-Close / K2-Close indicate a disturbance of the grid relays in the inverter.
The inverter checks the grid relays before connecting to the grid. If there are problems “opening” or “closing” the relays, for safety reasons the inverter will not connect to the grid.
At first, the yellow LED flashes “Code 5” and the inverter repeats the relay test. If the disturbance occurs frequently, for safety reasons the inverter switches to the “Permanent Disable Mode” and the yellow LED is continuously illuminated.
Inverter grid relays can be damaged by the use of screw-type fuses as load-break switches. A screw-type fuse element, e.g. DIAZED fuse or NEOZED fuse, does not have load-break properties and may therefore only be used as cable protection, not as a load-break switch.
For more information see the inverter’s operating / installation manual and the technical information “Circuit Breaker” .
Corrective measures:
If the message only appears very rarely (a maximum of once or twice a week), no further action has to be taken. In this case, the next step is to continue to monitor the device.
However, if the message repeats or persists, the device must be replaced.
In this case, please contact the SMA Service with the following information:
- Device type and serial number of the inverter
- If the device is in the warranty period: the warranty certificate
- LED blink code and error message
- Are screw-type fuses used as load-break switches in the installation?
- How long has the error been present for? Is it sporadic or continuous?
K1-Schliess; K1-Close; K1-Trenn; K2-Trenn; K1-open
SMC 9000TL / 10000TL / 11000TL (-RP)
SMC 6000TL / 7000TL / 8000TL
SMC 7000HV (-11)
SMC 4600A / 5000A / 6000A (-11)
SMC 5000 / 6000
SB 3300TL HC / 4200TL HC / 5000TL HC
SB 3300TL / 4200TL / 5000TL(W) Multi-String
SB 3300 / 3800 (-11)
SB 2500 / 2800i / 3000
SB 1300TL-10 / 1600TL-10 / 2100TL
SB 700 / 1100(E) / 1100LV / 1200 / 1700(E)
SWR