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Troubleshooting
4–6
153378
013
AC Voltage High
S
This fault indicates that the utility
grid voltage is above or rose above
the maximum allowed value of 110%
(default) of nominal Vac for greater
than 1 second. This fault is auto-
clearing. Once the Utility grid
voltage has recovered within the
acceptable operating range, the
GT100 will qualify the value and
automatically clear this fault and
resume normal operation after a
delay period
• Utility grid voltage
rose above the
allowable limit
• Neutral connection at
TB1-N may be loose or
disconnected
0015
Grid Disconnection
S
This fault indicates that the GT100
has detected a sudden AC voltage
increase of greater than 40% of the
nominal peak-to-peak value. This
normally is the result of a sudden
disconnection from the Utility grid
while the GT100 was processing
power.
• K1 was opened while
the GT100 was
processing power
0018
AC Contactor Open
S
This fault indicates that the GT100
has detected a sudden phase-shift
between AC voltage and current of
greater than 0.8 radians during a
twelve second period. This normally
is the result of the AC contactor
opening while the GT100 is
processing power.
• K1 was opened while
the GT100 was
processing power
• SSR1 failed
• TS1 or TS2 opened
0021
PV Over-Voltage
S
This fault indicates that the GT100
has detected a DC input voltage of
greater than the maximum allowed
value of 600 Vdc.
• PV system wiring short
• Lightning strike on PV
system wiring
0023
Bus Voltage High
H
This fault indicates that the GT100
has detected that the DC bus voltage
has exceeded the maximum allowed
value of 905 Vdc.
• PV system wiring short
• Lightning strike on PV
system wiring
Table 4-1
Fault Codes
Error
Code Fault
Source(s)
Fault Type
H=Hardware
S=Software
Fault Description
Possible Causes
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