Three-phase photovoltaic grid-connected inverter
Running
36
5.4.1 Periodic maintenance on the inverter
Item
Inspection mode
Maintenance period
Save the
inverter running
data
Adopt monitoring software to read the inverter data in
real time, and backup the data recorded by monitoring
software periodically. Save the inverter running data,
parameters and logs into the file, check the monitoring
software and various parameter setup of the inverter.
Once per quarter
Inverter running
state
Observe whether the inverter is installed firmly,
damaged or deformed. Listen for abnormal noise during
inverter operation. Check the variables during system
grid-connected running. Check whether the
temperature of inverter enclosure is normal and monitor
the heating condition with thermal imager.
Once per half a year
Clean the
inverter
Check the RH and dust around the inverter, and clean
the inverter when necessary. Refer to section 5.4.2.
Once per half a year
Electrical
connection
Check whether system cable connection and inverter
terminal block are loosened, if yes, secure them again
in the manner specified in section 4. Check whether the
cable is damaged, and whether the cable skin touched
by the metal surface is cut.
Once per half a year
Maintenance
and
replacement of
cooling fan
For three-phase inverters, observe whether the air
inlet/outlet is normal; check whether there are cracks on
the fan leaf. Listen for abnormal noise during fan
rotation. Clean the air inlet/outlet if necessary; If any
abnormity occurred to the fan, replace the fan
immediately . Refer to section 5.4.2.
Once per half a year
Safety function
Check the inverter LCD and stop function of the system.
Simulate stop operation and check the stop signal
communication. Check the warning marks and replace
them if necessary.
Once per half a year