System Manual
7 Commissioning
43
Ensure the system is properly grounded. Ground resistance is important for the whole
system so that before commissioning, make
sure the ground resistance is less than 4Ω
NOTICE
All operation during commissioning must be performed by qualified personnel
only.
Commission the device when it is sunny and the environmental conditions are
stable to ensure the successful commissioning.
7.3
Checking before Commissioning
7.3.1
Checking the Cable Connection
Check cables for any possible damages or cracks.
Check that all cables are connected securely according to the cable connection
diagram. Adjust the cable connection if necessary.
Ensure all cable connections are firmly enough. Fix the bolts if necessary.
Check the PE equipotential connection. Ensure PE ground copper bar has connected
to the equipotential connection point and properly grounded. The ground resistance
should be no more than 4Ω.
7.3.2
Checking the module
Ensure that the DC and AC switches are in the “OFF” position.
Check and ensureMV Station and switches upstream and downstream meet the
requirements and flexible enough.
7.3.3
Checking PV Array
Ensure the measuring devices are connected and used correctly. Otherwise, there
will be electric arc.
DC side voltage should be no more than the MV Station max. input DC voltage.
Too high DC voltage may damage the MV Station even cause safety incident.
To ensure the system reliability and device operation, the MV Station should
employ PV cells from the same manufacturer and the numbers of PV cells in
each string should be the same.
Check the PV arrays before grid-connection. The voltage of each DC main cables should
be the same and no more than the max. allowable DC voltage. Check carefully the polarity
of each DC main cable. Once the polarity in one DC main cable is incorrect, the PV arrays
