© 2016 Sensata Technologies
10
Troubleshooting
4.0 Troubleshooting
If your PV system does not operate properly, quali
fi
ed personnel
might correct the situation using the troubleshooting info below.
Status Indications and Error Reporting
The LED on the bottom of the MicroGT assists with troubleshooting.
Start up LED:
A quick red blink followed by three short green blinks when DC
power is
fi
rst applied to the MicroGT indicates a successful startup.
Operation LED:
Flashing Slow Green (10 sec. interval)
– producing power and
communicating with the MagWeb GT.
Flashing Fast Green (2 sec. interval)
– producing power, but not
communicating with MagWeb GT.
Flashing Red
– not producing power.
GFDI Error:
A solid red LED indicates the MicroGT 500 has detected a DC voltage
Ground Fault Detector Interrupter (GFDI) error in the PV system.
Unless the GFDI error has been cleared, the LED will remain red and
the MagWeb GT will keep reporting the fault. After the ground fault
error is
fi
xed, follow the instructions in the MagWeb GT Owner’s
Manual to clear this GFDI error.
Other Faults:
Other faults are reported to the MagWeb GT. Refer to the MagWeb
GT Owner’s Manual for other faults and troubleshooting procedures.
WARNING:
Only quali
fi
ed personnel should directly handle
the MicroGT 500 inverter.
WARNING:
Never disconnect the DC wire connectors under
load. Ensure that no current is
fl
owing in the DC wires prior
to disconnecting.
WARNING:
Always disconnect AC power before
disconnecting the PV module wires from the MicroGT
inverter. Either disconnecting the appropriate AC circuit
breaker or unplugging the
fi
rst AC connector of the
fi
rst
microinverter in a branch circuit is suitable as a means of
disconnection.
WARNING:
The MicroGT inverter is powered by PV module
DC power. AFTER disconnecting the DC power—when
reconnecting the PV modules to the microinverter—be sure
to watch for the four short LED
fl
ashes (x1 red, x3 green).
A Non-operating Micro GT Inverter
There are two possible overall areas of trouble:
• The MicroGT inverter may be having problems, or
• The MicroGT inverter is working
fi
ne, but it is having trouble
communicating with the MagWeb GT.
