8
8 - Maintenance
G
eneral conditions
Checking and maintenance operations must be carried out by specialized staff assigned to carry out this work.
Maintenance operations must be performed with the apparatus disconnected from the grid (power switch open) and the photovoltaic panels obscured or isolated, unless otherwise indicated.
For cleaning, DO NOT use rags made of filamentary material or corrosive products that may corrode parts of the equipment or generate electrostatic charges.
Avoid temporary repairs. All repairs should be carried out using only genuine spare parts.
The maintenance technician is under an obligation to promptly report any anomalies.
DO NOT allow the equipment to be used if problems of any kind are found, and restore the normal conditions correctly or otherwise make sure that this is done.
Always use the personal protective equipment provided by the employer and comply with the safety conditions of the Accident prevention chapter.
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Maintenance 8
R
outine maintenance
Scheduled maintenance operations are not mandatory, but are recommended to preserve the efficiency of the PV plant.
We recommend that maintenance operations be carried out by qualified personnel or by the personnel of Power-One (as set forth in a maintenance contract).
The periodicity of the maintenance operations may vary in accordance with local environmental conditions and the installation
Annual cleaning
Table: routine maintenance
Clean the device using non aggressive products as the latter are leable to damage the front cover of the device.
Annual operations Check that there has been no drastic change in the installation conditions that might have a negative influence on radio communication with micro-inverters
T
roubleshooting
To understand and address warnings (Wxxx) or errors (Exxx) generated by the MICRO-inverters in the installation and displayed on the CDD display, refer to the table shown in the next section.
The operations carried out on the CDD in order to identify and resolve malfunctions may be carried out only by the organization that carried out the installation or by qualified personnel
Power-One
CDD
Do not attempt to dismantle the equipment or make any internal repairs!
Any attempt to open the equipment could comprise the integrity of the casing’s insulation and generate a hazard, as well as invalidating the warranty
D
isplaying Alarm Messages on the CDD
Any messages and related codes can be checked on the display for the
CDD device.
The error messages may come from the MICRO inverters or directly from the CDD device.
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Alarm
Messages
WiFi - Lost
Connec
WiFi - Bad AP
WiFi - Wrong
Pass
WiFi - MAC no list
WiFi -
Forbidden
Gateway connec
Internet connec
WiFi - Bad
Connec
Data portal conn
Upg portal conn
Maintenance 8
A
larm Messages generated by the CDD
Code displayed
E005
Cause
The error is generated when the WiFi signal is interrupted. Possible causes: a) Loss of power in the supply or wi-Fi router latch b) Low signal level c) Router malfunction d) CDD malfunction
Solution
The alarm may be due to causes external to the CDD. Check that the WiFi router is working properly.
If no problems are found during the checks, please contact
Power-One Service.
a) Check the router is plugged in and switched on b) Position router and CDD closer to each other in order to increase the signal level and check antennas are tight (CDD and
Router) c) Try to connect to the Internet. Turn device ON/OFF if connection is not established. If the problem persists, the router might be faulty d) If the problem persists after performing the checks above, the
CDD might be faulty.
W004
W030
W006
W007
W009
W010
E030
W031
W012
The alarm is generated if the Access Point
(Router) is not compatible/supported
The alarm may be due to causes external to the CDD.
Verify compatibility of the WiFi router with the CDD device. A list of compatible routers is available at www.power-one.com
This alarm is generated when the WiFi network access password is wrong.
This alarm is generated when the CDD device
MAC Address is not present in the list of enabled MAC addresses on the router.
Enter the correct password.
Add the CDD device MAC Address to the list of enabled MAC addresses on the WiFi router, then try again to establish a connection.
This error is generated in the case of a forbidden connection to the WiFi router.
Communication problems with the remote
Web Portal.
This error is generated in case of absent connection between CDD and WiFi router with an Ethernet cable routing.
This error is generated when connection to the WiFi router is terminated wrongly.
No data to the portal a) Portal IP (in Network-configuration) not configured or invalid b) Portal down for maintenance c) No connection between the CDD and the router or router not connected to the Internet d) Active firewalls are impeding transmission of the data to the portal
If access is attempted and the password is entered incorrectly several times, the router, depending on the model, may refuse connection (for a configurable time duration).
a) Check that firewall settings allow transmission of data towards the portal a) Verify correct connection of the cable (both CDD and router end).
b) Try replacing the Ethernet cable
The alarm may be due to causes external to the CDD. Check that the WiFi router is working properly.
If no problems are found when checking the alarm may be caused by an internal problem in the CDD and in this case you should contact the Power-One Service department.
a) Controllare che l’indirizzo IP Portal nella sezione Network-
Configuration sia impostato correttamente b) Attendere il ripristino del Portale c) Controllare che tutte le connessioni del CDD e del router siano attive d) Controllare che non ci siano Firewall attiivi che impediscano l’invio di dati al portale.
No data to the portal a) Portal IP (in Network-configuration) not configured or invalid b) Portal down for maintenance c) No connection between the CDD and the router or router not connected to the Internet d) Active firewalls are impeding transmission of the data to the portal a) Check that the Portal IP address in the Network-Configuration section is correctly set b) Wait for the Portal to be restored c) Check that all CDD and router connections are active d) Check for active firewalls that may impede transmission of the data to the portal.
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Maintenance 8
A
larm Messages generated by the MICRO-inverter
Alarm
Messages
Input OC
Code
displayed
E001
Cause
The error appears when the inverter input current exceeds the set overcurrent threshold.
This may be caused by: a) sudden irradiation changes that may generate input current surges into the MICRO inverter b) PV module incompatible with the MICROinverter input characteristics c) Faulty MICRO-inverter
Solution a) The error occurs sporadically and no action is required as the MI-
CRO-inverter will automatically reset to normal operation b) It is necessary to verify that the photovoltaic panel specifications are compatible with the inverter.
c) If conditions a) and b) have been verified and the error persists, the malfunction may be caused by an internal inverter fault
Vbulk OV E004
Output OC E006
The error is generated when the voltage at the ends of the bulk capacitors exceeds the
Over Voltage threshold. This may be caused by: a) Grid voltage too high b) Internal inverter fault a) Check that the grid voltage is compatible with the MICRO-inverter specifications. In the event of highly abnormal grid voltage, please contact your grid operator to address the problem.
b) If no problems are found when checking the grid voltage, the alarm may be caused by internal inverter faults.
The error appears when the inverter output current exceeds the internal inverter alarm threshold.
This may be caused by: a) High impedance grid with significant voltage variations, even with small loads.
b) Internal inverter fault a) Check that the grid voltage is stable, mainly upon:
- loading with high current peak loads.
- maximum power generation of the PV system
If the grid voltage is unstable, verify the appropriate sizing of the line cable/s, and, if correct, please contact your grid operator to address the problem.
b) If no problems are found when checking the grid voltage, the alarm may be caused by internal inverter faults
OverTemp E014 High internal temperature recorded by the inverter. This parameter depends in part on the power that the inverter must supply, as the internal inverter temperature is affected by the heat dissipated internally by its components.
This may be caused by: a) Failure to observe the installation conditions b) Internal inverter fault a) Verify the installation conditions (exposure to sunlight) and check that air flow to the MICRO inverter is not obstructed, so as to permit cooling of the device. Check that the ambient temperature measured around the MICRO inverter does not exceed the limits set in the technical data.
b) Verify the MICRO-inverter temperature readings (see the Internal
Web Serversection in the CDD manual). If one of the temperatures remains at a value which is not compatible with the environmental conditions (e.g. -40°C internal temp. reading with 20°C effective ambient temperature), the alarm may be due to internal inverter causes.
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Ground fault
E018
DC
Injection
E023
Internal
Error
E024
Country
Mismatch
E050
Country
Not Comp
E051
Vpanel
Problem
W001
The error is generated when a ground leakage current is detected in the DC section of the system. This may be caused by: a) PV module ground leakage b) Internal inverter fault
Maintenance 8
See the “Verification of ground leakage” and “Measuring the insulation resistance” sections for information on how to perform checks and measurements.
a) If the measured insulation resistance value is less than 1KΩ, the PV module has a ground leakage that prevents the grid connection of the inverter. In this case the PV module must be replaced.
b) If the measured value exceeds 1KΩ, try connecting the MICRO-inverter to a different PV module. If the error persists, the alarm may be caused by internal inverter faults. To perform this test, the MICRO-inverter
Ground Fault condition must be reset via the Web Server.
The error is generated if the DC component of the current supplied to the grid exceeds the threshold set by the country of installation’s applicable regulation. In any case, the inverter will automatically try to reconnect to the grid. This may be caused by: a) Sporadic recurrence of this error is a sign of large grid distortions or sudden changes in irradiation.
b) Systematic recurrence of this error may be due to an inverter fault.
a) Verify the grid parameters and, if the grid voltage is strongly distorted, please contact your grid operator to address the problem
If the grid voltage is stable, the error may also be due to sudden irradiation variations. In this case, the inverter will automatically try to reconnect to the grid and no actions are required to solve the problem.
b) If the grid voltage is stable, yet the error systematically persists, the malfunction may be caused by an internal inverter fault a) The alarm may occur during inverter initialization and is caused by the initialization of communication between the CDD and the
MICRO inverters.
b) Systematic occurrence of this error may be due to an inverter fault.
a) The alarm will automatically reset upon connection of the inverter to the grid, and no actions are required to solve the problem.
b) If the error systematically persists, the malfunction may be caused by an internal inverter fault
The alarm is generated when the grid standard
(selected on the CDD during installation) has not been correctly set on the MICRO inverters.
This may be caused by: a) communication problems while setting the grid standard for the MICRO-inverter from the
CDD: b) poor irradiation while setting the grid standard for the MICRO-inverter from the CDD:
MICRO-inverters are directly supplied by the voltage generated at the panel, and poor irradiation may cause inverter shut-downs a) verify on the Internal Web Server (as described in the CDD manual), the radio communication quality on each MICRO-inverter (values above 60% indicate good reception). If the quality of the received signal is good re-configure the installation, otherwise consider installing the
CDD device in a different position to ensure better radio signal quality.
b) system configuration must be carried out in good irradiation conditions, in order to guarantee the correct operation of the MICRO-inverter and to prevent the risk of shut-downs due to insufficient input voltage generated by the PV module.
The set grid standard is not compatible with the firmware installed on the MICROinverter.
This condition may be generated if a MICROinverter is replaced.
This alarm is displayed when the input voltage generated at the PV generator is outside the allowed range given in the technical data.
This may be caused by: a) Poor irradiation b) Possible shadows that may darken the module during part of the day.
b) PV module incompatible with the MICROinverter input parameters d) Internal inverter fault
The firmware in the MICRO-inverter/s in the installation must be updated to a compatible version. Firmware updates are performed via the
Internal Web Server (see the CDD manual), with the software package obtained from Power-One Service a) Wait for appropriate irradiation to guarantee correct operation of the inverter b) Verify that no shadows are present on the PV module when the error is generated c) Verify that the PV panel voltage characteristics are compatible with the inverter input specifications.
d) If the above checks have yielded positive results, yet the error persists, the malfunction may be caused bythe MICRO-inverter.
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Grid Fail W003
Vbulk UV
Comm warning
W011
W025
Comm fault
W005
Remote Off E035
Maintenance 8
If the error is generated only on one of the installation MICRO-inverters, this may be due to an inverter fault.
This alarm is generated when one or more grid parameters lies outside the permitted range set by the country of installation’s grid standard. The error code will be followed by a suffix in brackets indicating the grid parameter out of range:
(UV) Grid voltage below the set lower limit
(OV) Grid voltage above the set upper limit
(UF) Grid frequency below the set lower limit
(OF) Grid frequency above the set upper limit
If the alarm is generated at multiple inverters in the installation, check the grid voltage for instabilities in any of the 4 parameters monitored by the inverter. If anomalous values are detected, verify the sizing of the
AC line conductors. In case of correct sizing, please contact your grid operator to address the problem.
Internal fault of the booster circuit inverter Contact Power-One Service.
T he alarm is generated when the CDD device does not receive messages from the MICROinverter for more than 5 minutes. This may be caused by non-optimal positioning of the CDD.
The alarm is generated when the CDD device does not receive messages from the MI-
CRO-inverter for more than 15 minutes. This may be caused by non-optimal positioning of the CDD.
The alarm is generated when an external shutdown command has been sent to the
MICRO-inverter.
Consider a new installation position that ensures better communication between the CDD device and the MICRO-inverters. Use the CDD
Internal Web Server to verify the signal quality (refer to the CDD manual for information on the Internal Web Server)
Consider a new installation position that ensures better communication between the CDD device and the MICRO-inverters. Use the CDD
Internal Web Server to verify the signal quality (refer to the CDD manual for information on the Internal Web Server)
Disable the Remote Off command .
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