|
|
|
|
PV generator ground fault:
The alarm is generated when an
ground fault current is detected in the DC section of the system.
|
- Make an insulation resistance measurement using
a megohmeter placed between the PV array (terminal
positive shorted to the negative pole) versus ground. The
measurement is strongly influenced by environmental conditions so
should be made under the same conditions under which the error has
occurred.
- Should the measured value be less than 1megaohm
a check by a technician/installer should be made on the
PV generator to locate and eliminate the problem.
- Should the measured value be greater than 1megaohm
and the error report continues to be present, contact
the Service STI Repair.
|
|
|
|
|
Failure to associate the new component:
The inverter's internal components (e.g., display, fuse board,
communication and control board, etc...) are not
associated with each other. This condition occurs
following the replacement of one of the internal components
to the inverter.
|
- Associate the internal components with the inverter by accessing the menu
"Settings > Service > Accept boards" (refer to
procedure in this manual).
- In case the warning continues to be present even
following the association contact Service STI Repair.
|
|
|
|
|
SET COUNTRY or NO NATION:
Indicates that
the grid standard on the inverter was not set during installation.
|
- Set the grid standard of the country of installation by following
the instructions in the present of the inverter.
- In case the warning continues to be present even at
following the setting of the grid standard, contact the Service STI Repair.
|
|
|
|
|
Vac absent:
The inverter displays the message "Vac absent"
when it does not detect output voltage (AC side).
|
- Check the mains voltage at the AC terminal block of the inverter.
- If it is absent, check for tripping of protections
on the line and the presence of mains voltage at the point of
supply.
|
|
|
|
|
Memory Failed:
The inverter displays the message "Memory
failed" when it detects communication problem with the
memory card in which the inverter saves, daily,
the value of daily energy produced.
|
- Remove the memory card and check that all connector terminals are soldered correctly
. Then re-insert
the memory card and verify that it is properly
inserted into the dedicated counterpart
- If the report continues to be present even in
following the above checks, contact STI Service Repair.
|
|
|
|
|
Waiting for sun:
The inverter displays the message "waiting for sun"
when, as a result of a warning from W001 and/or
W002, the voltage from the photovoltaic generator
turns out to be lower than the trigger voltage
(Vstart).
|
- Check the input voltage to the inverter.
- If it does not exceed Vstart, check for sufficient irradiation
and correct system composition.
- If it exceeds Vstart, contact Service STI Repair.
|
|
|
|
|
Insufficient irradiation (Low input voltage
when the inverter is turned on):
Misconfiguration of the PV generator or a
"borderline" configuration regarding the minimum
input voltage of the inverter.
|
- Check the input voltage to the inverter.
- If it does not exceed Vstart, check for sufficient irradiation
and correct system composition.
- If it exceeds Vstart, contact Service STI Repair.
|
|
|
|
|
Insufficient irradiation (Low input voltage
being shut down):
Misconfiguration of the PV generator or
a "borderline" configuration regarding the minimum
input voltage of the inverter
|
Check the input voltage to the inverter:
- If it does not exceed Vstart check for sufficient
irradiation and correct system composition.
- If it exceeds Vstart contact Service STI Repair.
|
|
|
|
|
Grid voltage parameters out of range:
This error is signaled when during
normal operation of the inverter, the grid parameters
go out of the limits set by the operator:
- Grid voltage absent (after signaling, the inverter
goes to "Vac Absent")
- Grid voltage unstable (down and up)
- Grid frequency unstable
|
- Check the grid voltage on the inverter.
- If absent, check the absence of grid voltage on the
point of supply.
- If, on the other hand, the voltage tends to rise (when the inverter
is connected), high line or grid impedances are present.
- Check the grid voltage also on the supply:
- If it is high, it means that high impedance is present on the
grid. If this is the case, request an adjustment of the line voltage
from the operator. If the operator authorizes a change to the parameters
of the inverter agree the new limits with the Service STI Repair.
- If the voltage at the point of supply is much lower than
the voltage measured on the inverter it is necessary to adjust the line
(inverter-to-meter).
- If the grid voltage and frequency are found to be within the limits
(even when the inverter is connected to the grid) contact the Service STI Repair.
|
|
|
|
|
Wind generator characterization table not
filled in (WIND models only)
|
|
W010 (not shown on display)
|
|
|
Faulty fan:
This error occurs when there is a malfunction
of the whole fan(s) at the inverter.
|
- Error internal to the inverter and not externally verifiable.
- Should the alarm persistently recur, contact
the Service STI Repair.
|
|
|
|
|
Low voltage of "Bulk" (DC-DC circuit):
The alarm (which is a warning and not an error), is generated
when the voltage at the ends of the bulk capacitors
does not reach the threshold for inverter operation
(internal threshold that cannot be changed).
|
- Raise the value of the trigger voltage (Vstart) so
as to have sufficient power from the PV generator at the time of the
grid connection of the inverter.
- Check the input voltage to the inverter.
- If it does not exceed Vstart, check for sufficient
irradiation and correct system composition.
- If it exceeds Vstart, contact Service STI Repair.
|
W012 (not shown on display)
|
|
|
Low Battery:
The inverter displays the message "Low Battery"
when it detects that the buffer battery voltage
is too low.
|
- Verify that the date/time are set correctly and if
they are not, set them.
Then proceed to completely turn off the inverter
(both AC and DC side) and wait for a few minutes.
Finally restart the inverter and check if the date/time are still
set correctly or if they are reset to 01/01/2000.
In this case, replace the battery when the inverter is completely
off (sectioning AC and DC side) paying attention to the respect
of polarity
|
W013 (not shown on display)
|
|
|
Clock Fault:
The alarm occurs when a difference
greater than 1 minute is created in the time displayed
from the internal time of the microprocessors and indicates
a clock circuit malfunction.
|
- Error internal to the inverter and not externally verifiable.
- Should the alarm persistently recur, contact
the Service STI Repair.
|
W017 (only for models with monitored string fuses)
|
|
|
Error detected in string current measurement:
Damaged string protection fuse(s)
|
- Check with a multimeter the status of the fuses (located on the
fuse boards).
- If one or more fuses are open arrange to replace them and check
that the input current on the string(s) does not exceed the fuse rating
(in case string parallels
external to the inverter were made).
- If there are no damaged string fuses and the inverter
continues to display the alarm message check whether
the settings to be made via the Aurora Manager software are
correct (presence or absence of one or more input strings).
|
W018 (only for models with
SPD monitored)
|
|
|
Tripping of DC-side surge arresters:
Surge arresters located on the DC side damaged
|
- Observe the inspection window on each arrester
(DC side). If it is red in color, the arrester is damaged and you
must replace the cartridge.
- If the alarm status continues even though
all the arresters have the green inspection window
contact Service STI Repair.
|
W019 (only for models with
SPD monitored)
|
|
|
Tripping of AC-side surge arresters:
Surge arresters located on the AC side damaged
|
- Observe the inspection window on each arrester
(AC side). If it is red in color, the arrester is damaged and you
must replace the cartridge.
- If the alarm status continues to be present even though
all the arresters have the green inspection window
contact Service STI Repair.
|
W022 (not shown on display)
|
Reactive power mode changed
|
|
Changing the power management mode
reactive power:
Changing the reactive power management mode;
this can be done via display
or advanced configuration software.
|
- Changing the reactive power management mode
is done directly by the customer/installer and is not
an error. The information is only saved to the
event history stored by the inverter
|
W023 (not shown on display)
|
|
|
Changing the date and time of the inverter:
Change the date and time of the inverter; this change
can be made via display or advanced
configuration software.
|
- The change of the inverter's internal date and time is made
directly by the customer/installer and is not an
error. The information is only saved to the
event history stored by the inverter
|
W024 (not shown on display)
|
|
|
Reset of energy statistics data stored
in the EEPROM:
Reset of energy data stored internally in the inverter;
this can be done via display or
advanced configuration software.
|
- The resetting of the partial energy values stored by the inverter
is done directly by the customer/installer and is not
an error. The information is only saved on the
history of events stored by the inverter.
- The alert may also occur in case of replacement
of the Memory Card where statistical production data are saved
|
|
|
|
|
Input overcurrent (PV generator):
The alarm occurs when the input current
of the inverter exceeds the maximum input current threshold
of the inverter.
|
- Check whether the composition of the PV generator allows
having an input current that exceeds the maximum threshold
allowed by the inverter, and that the configuration of the inputs (independent
or in parallel) is done correctly.
- If both checks are successful, contact Service STI Repair.
|
|
|
|
|
Input overvoltage (PV generator):
The alarm is generated when the input voltage
(coming from the PV generator) exceeds the threshold of maximum
input voltage of the inverter.
The alarm intervenes before the threshold
absolute threshold is reached beyond which the inverter will be damaged.
When the input voltage of the inverter exceeds the threshold
of Over Voltage, the inverter, will not start due to
generation of the alarm.
|
- It is necessary to measure the input voltage
inside the inverter with a voltmeter.
- If it turns out to be higher than the maximum voltage of the operational
range, the alarm is real and it is necessary to check the
configuration of the PV generator. If the voltage has exceeded
even the maximum input threshold, the inverter may be
damaged.
- If it turns out to be less than the maximum voltage of the operational
range, this is an alarm induced by an internal
malfunction and you need to contact Service STI Repair.
|
|
|
|
|
DSP initialization error:
The main microcontroller is unable to initialize
the two DSPs (booster stage and inverter stage) correctly.
The error is caused by communication problems
on the internal inverter bus.
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Overvoltage of "Bulk" (DC-DC circuit):
Internal inverter error. The alarm is raised when
the voltage at the ends of the bulk capacitors exceeds the
Over Voltage threshold (internal threshold that cannot be changed).
|
- The alarm may be caused by causes external to the inverter:
- Excessive input voltage may be detected as
bulk overvoltage condition. In this case it is advisable
to check the input voltage of the inverter and if
this value is close to the input OV threshold
revise the PV generator configuration.
- Excessive grid voltage could cause the
bulk voltage to rise in an uncontrolled manner resulting in
tripping of the protection and thus generation of the alarm. In such cases
the alarm is transient and the inverter will automatically restart
- The alarm may be caused by causes internal to the inverter and in
this case the Service STI Repair should be contacted.
|
|
|
|
|
Internal inverter communication error:
The alarm occurs when there are problems with
communication between the inverter's internal control devices.
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Output overcurrent:
The alarm occurs when the output current
of the inverter exceeds the maximum current threshold of
inverter output.
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Saturation detected on IGBT components:
The alarm occurs when one of the active devices
of the inverter is in the saturation state.
|
Once the error occurs, the inverter attempts to resume
normal operation.
- In the event that the error occurs sporadically, it may be
induced by an abrupt transition of the grid voltage or
of the input voltage but is not attributable to a malfunction
of the inverter.
- If the error is related to an internal failure, it will continue to occur
so it is necessary to contact Service STI Repair.
|
|
|
|
|
Internal inverter error:
Internal inverter error
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Low "Bulk" voltage (DC-DC circuit):
The alarm may be caused by causes external to the inverter:
a reduced inverter input voltage (slightly
higher than the trigger voltage) but which is not
accompanied by sufficient power availability from
part of the PV generator (typical condition of
phases with low irradiation)
|
- If the error report occurs sporadically it
can be attributed to causes external to the inverter (low irradiance
and thus diapability of little power from the generator
PV).
- If the problem occurs systematically even under
conditions of high irradiance and with input voltage
significantly higher than the trigger voltage, contact
the Service STI Repair.
|
|
|
|
|
High "Booster" ramp-up time:
Internal error in the inverter related to the ramp-up time of
ramp-up work of the DC-DC circuit part (Booster)
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Error on the "Booster" circuit part (DC-DC side)
revealed by the "Inverter" circuit part (DC-AC side):
Inverter internal error related to the operation of the
DC-DC(Booster) circuit part
|
- Error internal to the inverter and not externally verifiable.
- If the problem (once the inverter has been turned off and back on
) persists, contact STI Service Repair.
|
|
|
|
|
Incorrect input configuration (set in parallel
instead of independent):
The alarm is raised only when the inverter
is configured with parallel inputs. In this particular
configuration, the inverter checks the
input voltage of each of the two channels, and if the
two voltages differ from each other by more than 20Vdc the alarm is
raised.
|
- Check that the "IN MODE" switch setting is intentionally
set to "PAR" and that the jumpers
have been inserted between the two input channels.
- If the inverter configuration is correct, check that the
input strings have the usual number of panels in series,
of the usual brand, and with the same tilt/orientation.
- If both the inverter configuration and the characteristics of the
PV generator are in accordance with the specifications, contact STI Service Repair.
|
|
|
|
|
Inverter internal overtemperature:
external temperatures above 60°C. This parameter
also depends on the power to be delivered by the inverter
since the measurement of temperatures is done
internally and is affected by the heat dissipated by the
components of the inverter itself
|
- Make sure that the inverter is not exposed to direct sunlight.
Wait until the temperatures to which the inverter is exposed return
to the operating range and the inverter is able to cool down.
- If the problem (once the ambient temperature has
returned to the range) persists, contact Service STI Repair. Remember to wait a necessary amount of time to allow
the inverter to cool down
|
|
|
|
|
Fault detected on "Bulk" capacitors:
Internal inverter error related to problem in bulk capacitors
.
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Error on the "Inverter" circuit part (DC-ACside)
revealed by the "Booster" circuit part (DC-DC side):
The alarm is generated when a problem is detected
in the inverter(DC/AC) circuit part
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
High "Inverter" time to steady state entry:
Internal error in the inverter related to the
steady state work entry time of the DC-AC circuit part (Inverter).
The alarm may be caused by causes external to the inverter:
a low inverter input voltage (slightly
higher than the trigger voltage) but which is not
accompanied by sufficient power availability from
part of the PV generator (typical condition of
phases with low irradiation)
|
- If the error report occurs sporadically it
can be attributed to causes external to the inverter (low irradiance
and thus diapability of little power from the generator
PV).
- If the problem occurs systematically even under
conditions of high irradiance and with input voltage
significantly higher than the trigger voltage, contact Service STI Repair.
|
|
|
|
|
High leakage current measured on the DC side
(PV generator):
The alarm is generated when, during normal
operation of the inverter, a
leakage current to ground is detected in the DC section of the system.
It is also possible for the inverter to generate the
alarm message E018 also for AC leakage currents related
to the capacitive nature of the PV generator
with respect to ground.
|
- Make an insulation resistance measurement using
a megohmeter placed between the PV array (terminal
positive shorted to the negative pole) versus ground. The
measurement is strongly influenced by environmental conditions so
should be made under the same conditions under which the error has
occurred.
- Should the measured value be less than 1megaohm
a check by a technician/installer should be made on the
PV generator to locate and eliminate the problem.
- Should the measured value be greater than 1megaohm
and the error report continues to be present, contact
the Service STI Repair.
|
|
|
|
|
Failure of the test on the current measurement sensor
leakage current (DC side) :
Before connecting to the grid, the inverter performs a self-test
concerning the leakage current sensor (Leakage).
The test is carried out by "forcing" into the
leakage current sensor a current of known value: the microprocessor
compares the read value with the known value.
The error is generated if the comparison between the read value
and the known value during the test is not within the allowable
tolerance.
|
- Error internal to the inverter and not externally verifiable.
Due to its nature, the alarm manifests only before
connection to the grid
- If the problem (once an inverter shutdown and restart
has been performed) persists, contact STI Service Repair.
|
|
|
|
|
Failure of test on the "Booster" relay (DCDC circuit):
Before connecting to the grid, the inverter performs internal
tests. One of these tests concerns the correct operation
of the booster relay. The test is carried out by "forcing"
the relay to switch and checking its functionality.
The error is generated if a problem is found
in the relay actuation.
|
- Error internal to the inverter and not externally verifiable.
Due to its nature, the alarm manifests only prior to
connection to the grid
- If the problem (once an inverter shutdown and restart
has been performed) persists, contact STI Service Repair.
|
|
|
|
|
Failure of "Inverter" relay test (DCAC circuit):
Before connecting to the grid, the inverter performs internal
tests. One of these tests concerns the correct operation
of the inverter relay. The test is carried out by "forcing"
the relay to switch and checking its functionality.
The error is generated if a problem is found
in the relay's operation.
|
- Error internal to the inverter and not externally verifiable.
Due to its nature, the alarm manifests only prior to
connection to the grid
- If the problem (once an inverter shutdown and restart
has been performed) persists, contact STI Service Repair.
|
|
|
|
|
Timeout of tests performed on internal inverter relays:
Timeout of self-test performed on relays of
circuit part DC_AC (inverter) too high. May indicate
a problem related to the above relays
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
DC current input to the grid out of range:
The error is generated if the DC component of the
current delivered to the grid exceeds the threshold of 0.5 percent of the
rated operating current.
In any case, the inverter does not freeze due to the error
E023, but tries to connect to the grid again.
Sporadic repetition of the error is an indication of strong
grid distortions or abrupt changes in irradiance,
while a systematic repetition of the
error report, will be an indication of inverter failure
|
Once the error occurs, the inverter attempts to resume
normal operation.
- In the event that the error occurs sporadically, it may be
induced by an abrupt transition of the grid voltage or
of the input voltage but is not attributable to a malfunction
of the inverter.
- If the error is related to an internal failure, it will continue to occur
so it is necessary to contact Service STI Repair.
|
|
|
|
|
Internal inverter error:
Internal inverter error
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
E025 (not shown on display)
|
|
|
Low Insulation Resistance Value:
Before connecting to the grid, the inverter takes the measurement
of the insulation resistance of the PV generator with respect to
ground. If the insulation resistance measurement
is less than 1Mohm, the inverter does not connect to the grid
and shows the error "Rice Low" . The causes may be:
- Damaged PV panel(s);
- Panel junction box(es) not properly
sealed, such that water infiltration and/or
moisture can occur;
- Problems in the connections between panels (not perfectly
inserted);
- Poor quality cable splices;
- Presence in the DC section of surge arresters
external to the inverter that are unsuitable (trigger voltage
reduced compared to the characteristics of the generator strings
PV) or damaged;
- Presence of moisture inside the
field cabinet, if any
|
- Make an insulation resistance measurement using
a megohmeter placed between the PV array (terminal
positive shorted to the negative pole) versus ground. The
measurement is strongly influenced by environmental conditions so
should be made under the same conditions under which the error has
occurred.
- Should the measured value be less than 1megaohm
a check by a technician/installer should be made on the
PV generator to locate and eliminate the problem.
- Should the measured value be greater than 1megaohm
and the error report continues to be present, contact
the Service STI Repair.
|
|
|
|
|
Internal reference voltage out of range:
Inverter internal reference voltage measurement
incorrect
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Line voltage out of range:
Error in internal line voltage measurement (set
by standard) to have redundancy of measurement
(2 measurements on the same parameter made by
two different circuits)
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Mains frequency out of range:
Error in internal measurement of mains frequency (set
by standard) to have redundancy of measurement
(2 measurements on the same parameter made by
two different circuits)
|
- Error internal to the inverter and not externally verifiable.
- If the problem (once the inverter has been turned off and back on
) persists, contact STI Service Repair.
|
|
|
|
|
Internal overvoltage on "Mid bulk" measurement:
Internal inverter error (three-phase models only)
|
- Error internal to the inverter and not externally verifiable.
- If the problem (once the inverter has been turned off and back on
) persists, contact STI Service Repair.
|
|
|
|
|
High leakage current (DC side):
Error in the internal measurement (made when the inverter
is connected to the grid) of the leakage current of the
DC (PV generator) side with respect to ground (imposed by regulation)
to have redundancy of the measurement (2
measurements on the same parameter made by two different circuits
)
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Output relay damaged:
Internal voltage measurement at the ends of the output relay
out of range. There is too much voltage difference between
the input and output of the grid connection relay.
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Unbalanced output currents:
Measurement of output voltage unbalance (made
between the three phases) out of range (only in three-phase models)
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
|
|
|
|
Low ambient temperature:
Temperature outside the inverter less than -25°C
|
- Wait for the temperatures to which the inverter is exposed to return
to the operating range.
- If the problem persists, contact Service STI Repair.
Remember to wait a necessary amount of time to allow
the inverter to warm up.
|
|
|
|
|
"IGBT" circuitry not ready:
Internal inverter error.
|
- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
|
E035 (not shown on display)
|
|
|
Inverter waiting for "remote ON" command:
The inverter has been turned off remotely (remote OFF) and remains
in a state of waiting for the signal that will turn it back on
(Remote ON)
|
- Turn the inverter back on remotely. If the unit does not turn back on,
disable the power off/on function from
remote and perform a total shutdown of the equipment and
a subsequent restart.
- If the problem (once the Remote ON/
OFF function is reactivated from the display) persists contact Service STI Repair.
|
|
|
|
|
Average of grid voltage measurements out of range:
The average value of the grid voltage (sampled every
10 minutes) is outside the permissible ranges. The voltage of
grid at the point connected to the inverter is too high. This
may be caused by too high a grid impedance.
In the final phase of the timout, the inverter limits power to
check if the grid voltage stabilizes in the regular
parameters. If this does not happen the inverter will disconnect
from the grid
|
- Check the grid voltage at the point where the inverter is connected.
- If the grid voltage deviates from the range due to conditions
of the distribution grid, request an adjustment of the
grid voltage from the operator. If the operator authorizes a change
to the inverter parameters agree the new limits with the Service STI Repair.
|
|
|
|
|
Low insulation resistor value (only with "Amorphous" mode enabled):
This error can only occur if the
"Amorphous" mode is enabled. This function is enabled
only in inverters equipped with a grounding kit and is used to
monitor the voltage at the ends of the grounding resistor.
The error occurs when the voltage at the ends
of the collagated resistor between ground and generator pole
PV exceeds 30V for more than 30 minutes or 120V
for more than one second.
|
- Verify the presence and correct contacting of the two terminals
of the grounding resistor installed inside the inverter
- Make an insulation resistance measurement using
a megohmeter placed between the PV array (terminal
positive shorted to the negative pole) with respect to ground. The
measurement is strongly influenced by environmental conditions so
should be made under the same conditions under which the error
occurred.
- If the measured value should be less than 1megaohm
a check by a technician/installer should be made on the
PV generator to identify and eliminate the problem.
- If the measured value should be greater than 1megaohm
and the error report continues to be present, contact
the Service STI Repair.
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Error during automaticstringvoltage check
(only in models with "fuse-control" board):
In some inverter models, it is possible to carry out the
test by verifying the polarity of the strings connected to the input
(Ex:TRIO-20.0/27.6kW).
This error is signaled when, during
the test phase, an inverted string is detected
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- Disconnect the inverter and verify the polarity of the string/strings
which the inverter has detected as reversed.
- Once all strings have been properly connected carry out
commissioning again; the inverter will again check
the correct polarity of the string inputs at the end of
which will carry out checks for grid connection.
- If the problem (once a power off and on
of the inverter has been carried out) persists contact STI Service Repair.
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Error in the "AC feed-forward" circuit part:
Internal inverter error
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- Error internal to the inverter and not externally verifiable.
- If the problem (after a power down and restart
of the inverter) persists, contact STI Service Repair.
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Over Temp. (from
external box)
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Excessive temperature measured inside the inverter wiring box:
High internal temperature.
This error is related to the temperature measured on
external box (Ex:TRIO-20.0/27.6kW)
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- Make sure that the inverter is not exposed to direct sunlight.
Wait until the temperatures to which the inverter is exposed return
to the operating range and the inverter is able to cool down.
- If the problem (once the ambient temperature has
returned to the range) persists, contact Service STI Repair. Remember to wait a necessary amount of time to allow
the inverter to cool down
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Input voltage (Vin) greater than the
boostervoltage(Vbulk):
The error occurs if the input voltage exceeds the
Bulk voltage (voltage on the DC-DC circuit part
inside the inverter)
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- It is necessary to measure the input voltage
inside the inverter with a voltmeter.
- If it turns out to be higher than the maximum voltage of the
operating range, the alarm is real and it is necessary to check the
configuration of the PV generator. If the voltage has exceeded
even the maximum input threshold, the inverter may be
damaged.
- If it turns out to be lower than the maximum voltage of the operational
range, it is an alarm induced by an internal
malfunction and it is necessary to contact Service STI Repair.
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Error in Pin vs Pout control:
The error occurs if the difference between the measured value of input power and output power is greater than the limit value set internally in the inverter.
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- Error internal to the inverter and not externally verifiable.
- If the problem (once the inverter has been turned off and back on
) persists, contact STI Service Repair.
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