4 Service SMA Solar Technology AG
40 SHP75-10-STP60-10-IA-xx-18 Installation Guide
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
• towards the fan on the underside of the inverter.
To clear obstructions, clean using compressed air, a soft
cloth, or a brush.
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).
Warning: Do not operate the DC
load-break switch of the inverter.
Switching off the DC voltage using a
suitable DC load-break switch in the
Combiner Box is still possible. Do not
perform any further actions or switching
operations on the inverter. Contact
Service immediately.
-x-
366 Residual-current monitoring unit (RCMU)
self-test failed.
Contact the service. - x -
ID Description Measures DNO SMA
Service
Line
PV
The temperature of the heat sink can exceed 70°C.
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