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6 Fault finding
6.1 Grid Volt Error
Possible causes:
1) Grid supply is under or over
voltage.
2) Grid frequency is lower/higher
than allowed
3) Grid connection error (no Live
and/or Neutral).
Solutions:
1) Check supply voltages to
consumer unit
2) Check frequency of power supply
at consumer unit
3) Check compatibility of inverter for
power supply being used.
6.2 TVS/Over Power
Possible causes:
1) TVS component failure
2) System Overload
Solutions:
1) Contact Grant Engineering
Service department to arrange for
the replacement of the TVS
components when the display reads
'TVS1 or TVS2 failure'.
2) If the display reads 'PV Over
Power', check the PV configuration
and check for inverter compatibility.
16
6.3 DC Supply Issue
Possible causes:
1) DC input over or under Voltage
Solutions:
1) Isolate the inverter and check the
Strings for over/under voltage.
2)Check this measurement with the
aid of an irradiance meter. (Optional
equipment from Grant Engineering.)
6.4 Inverter Defect
Possible causes:
1) Internal errors including power
components, over power condition,
other system errors.
Solutions:
1) Turn DC isolators off, turn AC
isolators off and wait for 10
minutes. Check AC voltage supply
and if all is well, restart the inverter
normally.
2) If the systems fails to operate
normally, shut down the system
and contact the system installer.
WARNING
There are no user-serviceable
components inside the Grant grid
connected inverter.
Service and repair of the unit can
only be carried out by Grant
Engineering or a trained Grant
representative, due to a high risk
of electric shock!
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