ABB TRIO-20.0-TL-OUTD-S-US-480

T011C5
- 83 -
5 - Troubleshooting
Display Message Causes Solution
E078
Riso test fail
(Inverter returns a
value different from
OK or Riso low)
Before connection, the inverter
made two different Riso circuit
self tests:
1. Riso relay self test (displayed
as self test 1)
2. Algorithm self test (displayed
as self test 2)
The inverter failed one of the two
RISO tests.
Check PV strings for leakage current. If there is any
leakage current found, contact ABB technical support.
W001
Sun Low
(Low input voltage-
cannot connect to
grid)
Insufcient sunlight. Wrong
conguration of the PV array or a
conguration “at the limit” relative
to the minimum input voltage of
the inverter.
Check the inverter input voltage. If it does not exceed
the Vstart, check that there is sufcient sunlight and
that the conguration of the system is correct. If
the input voltage exceeds the Vstart, contact ABB
technical support.
W002
Input UV
(Low input voltage
during inverter
switch-off)
Insufcient sunlight, wrong
conguration of the photovoltaic
array or a conguration “at the
limit” relative to the minimum
input voltage of the inverter.
Check the inverter input voltage. If it does not exceed
the Vstart, check that there is sufcient sunlight and
that the conguration of the system is correct. If it
exceeds the Vstart, contact ABB technical support.
W003
Grid Fault
(Grid parameters
outside the limits)
This error warning appears
during normal inverter operation
when the grid parameters fall
outside the limits set by the grid
company.
No grid voltage (after the
warning, the inverter goes on
“No Vac”). Unstable grid voltage
(downwards and upwards).
Unstable grid frequency.
Check the grid voltage on the inverter. If absent,
check for the absence of grid voltage on the supply.
If the voltage tends to rise (when the inverter is
connected), there are high line or grid impedances.
Check the grid voltage on the supply as well -- if it is
high, there is high grid impedance. In this case, ask
the grid company to adjust the grid voltage. If the
grid company authorizes a change to the inverter
parameters, arrange the new limits with ABB technical
support.
If the voltage at the supply point is much lower than
that measured on the inverter, the line must be
adjusted (inverter-counter). If the grid voltage and
frequency fall within the limits (even when the inverter
is connected to the grid), contact ABB technical
support.
W010
Fan Fault
(Fan fail -- alarm
not shown on the
display; only a
ashing yellow
LED)
This error appears when a fan
inside the inverter has failed. In
this condition, the yellow LED on
the front panel ashes.
Error inside the inverter that cannot be resolved
with external operations. If the alarm is persistently
repeated, contact ABB technical support.