SMA Solar Technology AG 4 Service
Installation Manual STP60-JP-10-IA-en-11 29
Events Caused by the Self-Test
Table 4.5 Events caused by the self-test
4.2 Maintenance
Ensure that the heat sink at the rear of the inverter is not
covered.
Clean the contacts of the PV load-break switch once a year.
Clean by cycling the switch to on and off positions ten times.
The PV load-break switch is located at the bottom of the
inverter.
For correct operation and a long service life, ensure free air
circulation for the following areas:
• around the heat sink at the top and side of the inverter
where the air exhausts, and
• toward the fan at the inverter base.
To clear obstructions, clean using compressed air, a soft
cloth, or a brush.
ID Description Measure DNO SMA
Service
Line
PV
100 PV input current is negative. Sensor fault. Check the polarity of the PV system. If
polarity is correct, call Service.
-x-
264,
266
Measurement circuit test failed. Restart the inverter. If the event persists,
call Service.
-x-
272 PV overvoltage protection device error.
Inverter will continue operation without
overvoltage protection.
Replace PV overvoltage protection
device. See SPD replacement
instructions for details.
-x-
273 Grid overvoltage protection device
error. Inverter will continue operation
without overvoltage protection.
Replace PV overvoltage protection
device. See SPD replacement
instructions for details.
-x-
274 Overvoltage protection device status
unknown.
Restart the inverter. If the event persists,
call Service.
-x-
350–
352
Residual-current monitoring unit (RCMU)
self-test failed.
Contact the Service. - x -
353 Current sensor test failed. Contact the Service. - x -
356–
361
Transistor and relay test failed or inverter
relay has failed (contact assumed
welded).
Contact the Service. - x -
366 Residual-current monitoring unit (RCMU)
self-test failed.
Contact the Service. - x -
The temperature of the heat sink can exceed 70°C.
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