SMA MLX Series - Manual (Page 31)

ID Status
message Description Action DNO Hotline PV
323 Internal fan error. Maximum output power
has been reduced.
If the event is repeated, call service. - x -
Table 4.3 Internal Events
Events Caused by the Self-test
ID Description Action DNO Hotline PV
100 PV input current is negative.
Sensor error.
Check polarity of PV installation, if correct,
call service.
- x -
264, 266 Measurement circuit test failed. Restart the inverter. If event persists, call
service.
- x -
272 PV surge protection device error. Inverter will continue
operation without surge protection.
Service: Replace PV surge protection device. - x -
273 Grid surge protection device error. Inverter will continue
operation without surge protection.
Service: Replace grid surge protection
device.
- x -
274 Surge protection device status unknown. Restart the inverter. If event persists, call
service.
- x -
350–352 RCMU self-test failed. Call service. - x -
353 Current sensor test failed. Call service. - x -
356–361 Transistor and relay test failed or inverter relay has failed
(contact assumed welded).
Call service. - x -
366 RCMU self-test failed. Call service. - x -
Table 4.4 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 switch once per year.
Clean by cycling the switch to on and off positions 10
times. The PV load switch is located at the base of the
inverter.
For correct operation and long service life, ensure free air
circulation
• around the heat sink at the top and side of the
inverter where the air exhausts, and
• to the fan at the inverter base.
To clear obstructions, clean using pressurised air, a soft
cloth, or a brush.
WARNING
Temperature of the heat sink can exceed 70 °C.
Service
30 L00410644-01_2q / Rev. date: 2014-06-02
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