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Troubleshooting
4–20
975-0240-01-01
F16
AC2 Input L1
Under Frequency
Automatic
AC2 under-frequency
shutdown (AC Line 1
input) at the AC2 Lo
Freq setting.
Fault clears when frequency rises
above the AC2 Lo Freq setting.
Check AC input frequency. Check
and adjust AC input low frequency
setting.
F17
Relay(s) Welded
Manual
The AC1 L1 transfer
relay is bad or an AC
source was wired
directly to the AC
output.
Disconnect the inverter’s output
wiring. If error continues, have unit
serviced.
F18
Relay(s) Welded
Manual
AC1 L2 transfer relay is
bad or an AC source was
wired directly to the AC
output.
See F17.
F19
Relay(s) Welded
Manual
AC2 L1 transfer relay is
bad or an AC source was
wired directly to the AC
output.
See F17.
F20
Relay(s) Welded
Manual
AC2 L2 transfer relay is
bad or an AC source was
wired directly to the AC
output.
See F17.
F21
Relay(s) Welded
Manual
An unidentified transfer
relay is bad or an AC
source was wired
directly to the AC
output.
See F17.
F22
Relay(s) Welded
Manual
An unidentified L1
transfer relay is bad or an
AC source was wired
directly to the AC
output.
See F17.
F23
AI Over Frequency
Automatic
Over-frequency anti-
islanding, caught by the
AC qualification limit.
No action required. The inverter
stops selling and disconnects from
the grid. When the fault clears, a
five-minute timer begins counting
down. The inverter does not sell
again until grid voltage and
frequency are within range for five
minutes.
Table 4-5
Fault Messages
Fault
Number
Message
Fault Type
Cause
Solution
Summary of Contents for XW4024-120
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