Alarms
Cause
Solution
•
Inverter detects grid
Frequency as too high
OV-G-F: Over
Grid Frequency
Test – DC switch OFF
•
Check frequency at the inverter test points
•
If Frequency measures high, adjust upper
limit with permission from utility
•
Check LCD reading, may be a bad
measurement circuit
Test – DC Switch ON
•
Check grid standard
•
Replace inverter
NO-GRID
•
Inverter does not
detect the grid
Test – DC switch OFF
•
Check AC at the inverter test points
•
L-L, L-GND
•
Do NOT tell me 240VAC
•
Check LCD reading, may be a bad
measurement circuit
Test – DC Switch ON
•
Check grid standard
•
Replace inverter
OV-DC: DC
voltage is too
high
•
Inverter detects High DCV
Test – DC switch OFF
•
Check DC at the inverter test points
•
If DCV is high, too many panels in the string
Test – DC Switch ON
•
Check LCD reading, may be a bad
measurement circuit
•
Replace inverter
OV-BUS: DC
BUS voltage is
too high
•
Inverter detects High
DCV on internal bus
Test
•
Measure DC and AC voltages
•
Compare with LCD
•
Replace Inverter
•
Internal damage
•
Wire came loose during shipping
UN-BUS: DC
BUS voltage is
too low
•
Inverter detects low DCV
on internal bus
Test
•
Measure DC and AC voltages
•
Compare with LCD
•
Replace Inverter
•
Internal damage
•
Wire came loose during shipping
9. Troubleshooting
9. Troubleshooting
Alarms
Cause
Solution
•
Inverter detects grid
instability, internal fault
current high
GRID-INTF:
Grid unstable
Test – With DC Switch OFF
•
Measure AC voltage
•
Test AC line for THD
•
Test – With DC Switch ON
Test AC line for THD
•
Multiple inverters/turn one off
•
Impedance matching adjustment or box
•
Internal damage
•
Wire came loose in shipping
•
Master and Slave DSP
have different values
Reset Inverter
•
DC switch OFF
•
Wait until all lights/LCD turn off
•
DC switch ON
•
Replace inverter
•
Inverter detects high
ambient temperature >60C
Inspect installation
•
Check heatsink for obstructions/ventilation
•
Is inverter in direct sunshine
•
Measure ambient temperature near inverter
•
If temp is in range replace inverter
•
Inverter detects low DC
insulation resistance
Inspect installation
•
Reset inverter
•
Note weather conditions when alarm occurs
•
Measure insulation resistance
•
If normal, measure in SAME weather as alarm
•
Physically check cables
•
Replace inverter
Table 9.1 Fault messages and descriptions
.46.
.47.
INI-FAULT:
Initialization
Protection
OV-TEM:
Temperature
Protection
PV ISO-PRO
01/02:
Ground
Protection