SMA Solar Technology AG
ID
Description
272
DC overvoltage protection device error.
Inverter will continue operation without
overvoltage protection.
273
AC grid surge protection device error.
Inverter will continue operation without
surge protection device.
274
Overvoltage protection device status
unknown.
350–
Residual-current monitoring unit (RCMU)
352
self-test failed.
353
Current sensor test failed.
356–
Transistor and relay test failed or inverter
361
relay has failed (contact assumed
welded).
366
Residual-current monitoring unit (RCMU)
self-test failed.
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.
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.
The temperature of the heat sink can exceed 70°C.
Installation Manual
Measure
Replace DC overvoltage protection
device. See SPD replacement
instructions for details.
Replace AC grid surge protection
device. See SPD replacement
instructions for details.
Restart the inverter. If the event persists,
call Service.
Contact the service.
Contact the service.
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.
Contact the service.
4 Service
DNO
SMA
Service
Line
-
x
-
x
-
x
-
x
-
x
-
x
-
x
STPS60-IA-xx-12
DC
-
-
-
-
-
-
-
39