Delta RPI Home Series Solar Inverter faults

Delta RPI Home Series Solar Inverter faults

The Delta RPI Home Series range of solar inverters can develop a number of different faults, when a fault is present an error message will be displayed on the screen. Below is a list of error messages, explanations on the error or fault and a list of actions to take to resolve the issue.

If you have one of the error or fault messages below we recommend you follow the listed actions to take to remove the fault before contacting a company who can help you further such as Gold Coast Solar Power Solutions.

 

Need service for your solar power system?

Delta RPI – M Series inverter faults

Message Possible Cause Action
AC Freq
High
1. Actual utility frequency is over
the OFR setting
2. Incorrect country setting
3. Detection circuit malfunction
1. Check the utility frequency on the inverter
terminal
2. Check country setting
3. Check the detection circuit inside the inverter
AC Freq
Low
1. Actual utility frequency is
under the UFR setting
2. Incorrect country or Grid
setting
3. Detection circuit malfunction
1. Check the utility frequency on the inverter
terminal
2. Check country & Grid setting
3. Check the detection circuit inside the inverter
Grid Quality Non-linear load in Grid and near
to inverter
Grid connection of inverter need to be far away
fromnon-linear load if necessary
HW Connect
Fail
1. Wrong connection in
AC plug
2. Detection circuit malfunction
1. Check the AC connection, must accords to
manual
2. Check the detection circuit inside the inverter
No Grid 1. AC breaker is OFF
2. Disconnect in AC plug
1. Switch on AC breaker
2. Check the connection in AC plug and make
sure it connects to inverter
AC Volt Low 1. Actual utility voltage is under
the UVR setting
2. Incorrect country or Grid
setting
3. Wrong connections in AC plug
4. One or more internal fuses are
broken
5. Detection circuit malfunction
1. Check the utility voltage connection to the
inverter terminal
2. Check country & Grid setting
3. Check the connection in AC plug
4. Replace fuses (FUC1-3) and check all
switching devices in boost & inverter stages
5. Check the detection circuit inside the inverter
AC Volt High 1. Actual utility voltage is over
the OVR setting
2. Utility voltage is over the Slow
OVR setting during operation
3. Incorrect country or Grid
setting
4. Detection circuit malfunction
1. Check the utility voltage on the inverter
terminal
2. Check the utility voltage on the inverter
terminal
3. Check country & Grid setting
4. Check the detection circuit inside the inverter
Solar1 High 1. Actual Solar1 voltage is over
1000Vdc
2. Detection circuit malfunction
1. Modify the solar array setting, and make the
Voc less than 1000Vdc
2. Check the detection circuit inside the inverter
Solar2 High 1. Actual Solar2 voltage is over
1000Vdc
2. Detection circuit malfunction
1. Modify the solar array setting, and make the
Voc less than 1000Vdc
2. Check the detection circuit inside the inverter
Insulation 1. PV array insulation fault
2. Large PV array capacitance
between Plus to Ground or
Minus to Ground or both.
3. Detection circuit malfunction
1. Check the insulation of Solar inputs
2. Check the capacitance, dry PV panel if
necessary
3. Check the detection circuit inside the inverter
Solar1 Low 1. Actual Solar1 voltage is
under the limit
2. Some devices were
damaged inside the inverter
if the actual Solar1 voltage is
close to “0”
3. Detection circuit malfunction
1. Check the Solar1 voltage connection to the
inverter terminal
2. Check all switching devices in boost1
3. Check the detection circuit inside the inverter
Solar2 Low 1. Actual Solar2 voltage is
under the limit
2. Some devices were
damaged inside the inverter
if the actual Solar2 voltage is
close to “0”
3. Detection circuit malfunction
1. Check the Solar2 voltage connection to the
inverter terminal
2. Check all switching devices in boost2
3. Check the detection circuit inside the inverter
HW FAN 1. One or more fans are locked
2. One or more fans are
defective
3. One ore more fans are
disconnected
3. Detection circuit malfunction
1. Remove the object that stuck in the fan(s)
2. Replace the defective fan(s)
3. Check the connections of all fans
4. Check the detection circuit inside the inverter
HW DC
Injection
1. Utility waveform is abnormal
2. Detection circuit malfunction
1. Check the utility waveform. Grid connection of
inverter need to be far away from non-linear
load if necessary
2. Check the detection circuit inside the inverter
Temperature
High
1. The ambient is over 60℃
(The installation is abnormal)
2. Detection circuit malfunction
1. Check the installation ambient and
environment
2. Check the detection circuit inside the inverter
HW NTC1
Fail
1. Ambient temperature >90℃
or <-30℃
2. Detection circuit malfunction
1. Check the installation ambient and
environment
2. Check the detection circuit inside the inverter
(RTM1)
Temperature
Low
1. Ambient temperature is
<-30℃
2. Detection circuit malfunction
1. Check the installation ambient and
environment
2. Check the detection circuit inside the inverter
(RTG1)
HW NTC4
Fail
1. Ambient temperature >90℃
or <-30℃
2. Detection circuit malfunction
1. Check the installation ambient and
environment
2. Check the detection circuit inside the inverter
(RTH1)
HW DSP
ADC1
1. Insufficient input power
2. Auxiliary power circuitry
malfunction
3. Detection circuit malfunction
1. Check the input voltage, must > 150Vdc
2. Check the auxiliary circuitry inside the inverter
3. Check the detection circuit inside the inverter
HW DSP
ADC2
1. Insufficient input power
2. Auxiliary power circuitry
malfunction
3. Detection circuit malfunction
1. Check the input voltage, must > 150Vdc
2. Check the auxiliary circuitry inside the inverter
3. Check the detection circuit inside the inverter
HW DSP
ADC3
1. Insufficient input power
2. Auxiliary power circuitry
malfunction
3. Detection circuit malfunction
1. Check the input voltage, must > 150Vdc
2. Check the auxiliary circuitry inside the inverter
3. Check the detection circuit inside the inverter
HW Red
ADC1
1. Insufficient input power
2. Auxiliary power circuitry
malfunction
3. Detection circuit malfunction
1. Check the input voltage, must > 150Vdc
2. Check the auxiliary circuitry inside the inverter
3. Check the detection circuit inside the inverter
HW Red
ADC2
1. Insufficient input power
2. Auxiliary power circuitry
malfunction
3. Detection circuit malfunction
1. Check the input voltage, must > 150Vdc
2. Check the auxiliary circuitry inside the inverter
3. Check the detection circuit inside the inverter
HW
Efficiency
1. The calibration is incorrect
2. Current feedback circuit is
defective
1. Check the accuracy of current and power
2. Check the current feedback circuit inside the
inverter
HW COMM2 1. Red. CPU is idling
2. The communication
connection is disconnected
1. Check reset and crystal in Red. CPU
2. Check the connection between Red. CPU and
DSp
HW COMM1 1. DSP is idling
2. The communication
connection is disconnected
3. The communication circuit
malfunction
1. Check reset and crystal in DSP
2. Check the connection between DSP and
COMM
3. Check the communication circuit
Ground
Current
1. PV array insulation fault
2. Large PV array capacitance
between Plus to Ground or
Minus to Ground
3. Either side of boost driver or
boost choke malfunction
4. Detection circuit malfunction
1. Check the insulation of Solar inputs
2. Check the capacitance (+ <-> GND & – <->
GND), must < 2.5uF. Install a external
transformer if necessary
3. Check boost driver & boost choke
4. Check the detection circuit inside the inverter
HW Connect
Fail
1. Power line is disconnected
inside the inverter
2. Current feedback circuit is
defective
1. Check the power lines inside the inverter
2. Check the current feedback circuit inside the
inverter
RCMU Fail 1. RCMU is disconnected
2. Detection circuit malfunction
1. Check the RCMU connection inside the
inverter
2. Check the detection circuit inside the inverter
Relay Test
Short
1. One or more relays are
sticking
2. The driver circuit for the relay
malfunction
1. Replace the defective relay(s)
2. Check the driver circuit inside the inverter
Relay Test
Open
1. One or more relays are
abnormal
2. The driver circuit for the relay
malfunction
3. The detection accuracy is not
correct for Vgrid and Vout
1. Replace the defective relay(s)
2. Check the driver circuit inside the inverter
3. Check the Vgrid and Vout voltage detection
accuracy
Bus
Unbalance
1. Not totally independent or
parallel between inputs
2. PV Array short to Ground
3. Driver for boost is defective or
disconnected
4. Detection circuit malfunction
1. Check the inputs connections
2. Check the PV Array insulation
3. Check the driver circuit for boost inside the
inverter
4. Check the detection circuit inside the inverter
HW Bus
OVR
1. Driver for boost is defective
2. Voc of PV array is over
1000Vdc
3. Surge occurs during operation
4. Detection circuit malfunction
1. Check the driver circuit for boost inside the
inverter
2. Modify the solar array setting, and make the
Voc less than 1000Vdc
3. N/A
4. Check the detection circuit inside the inverter
AC Current
High
1. Surge occurs during operation
2. Driver for inverter stage is
defective
3. Switching device is defective
4. Detection circuit malfunction
1. N/A
2. Check the driver circuit in inverter stage
3. Check all switching devices in inverter stage
4. Check the detect circuit inside the inverter
HW CT A
Fail
1. Test current loop is broken
2. CSC1 is defective
3. Detection circuit malfunction
1. Check the connection of WC3 to CNC16
2. Replay CSC1 with new one
3. Check the detection circuit inside the inverter
HW CT B
Fail
1. Test current loop is broken
2. CSC2 is defective
3. Detection circuit malfunction
1. Check the connection of WC3 to CNC16
2. Replace CSC2 with new one
3. Check the detection circuit inside the inverter
HW CT C
Fail
1. Test current loop is broken
2. CSC3 is defective
3. Detection circuit malfunction
1. Check the connection of WC3 to CNC16
2. Replace CSC3 with new one
3. Check the detection circuit inside the inverter
HW AC OCR 1. Large Grid harmonics
2. Switching device is defective
3. Detection circuit malfunction
1. Check the utility waveform. Grid connection of
inverter need to be far away from non-linear
load if necessary
2. Check all switching devices in inverter stage
3. Check the detection circuit inside the inverter
HW ZC Fail The detection circuit for
synchronal signal malfunction
Check the detection circuit for synchronal signal
inside the inverter
DC Current
High
1. Switching device in boost is
defective
2. Driver for boost is defective
3. Input current detection circuit
malfunction
1. Check all switching device in boost
2. Check the driver curcuit for boost inside the
inverter
3. Check input current detection circuit

Delta RPI – H Series inverter faults

Message Possible cause Action
E01: Grid Freq
Over Rating
1. Actual utility frequency is
over the OFR setting
2. Incorrect country setting
3. Detection circuit malfunction
1. Check the utility frequency on the inverter
terminal
2. Check country setting
3. Check the detection circuit inside the
inverter
E02: Grid Freq
Under Rating
1. Actual utility frequency is
under the UFR setting
2. Incorrect country or Grid
setting
3. Detection circuit malfunction
1. Check the utility frequency on the inverter
terminal
2. Check country & Grid setting
3. Check the detection circuit inside the
inverter
E07:Grid
Quality
Non-linear load in Grid and
near to inverter
Grid connection of inverter need to be far
away from non-linear load if necessary
E09: No Grid 1. AC breaker is OFF
2. Disconnect in AC plug
3. Internal fuses are broken
1. Switch on AC breaker
2. Check the connection in AC plug and
make sure it connects to inverter
3. Replace fuses and check all switching
devices in boost & inverter stages
E10: Grid Volt
Under Rating
1. Actual utility voltage is under
the UVR setting
2. Utility voltage is under the
Slow UVR setting during
operation
3. Incorrect country or Grid
setting
4. Detection circuit malfunction
1.&2. Check the utility voltage connection to
the inverter terminal.3. Check country & Grid setting
4. Check the detection circuit inside the
inverter
E11: Grid Volt
Over Rating
1. Actual utility voltage is over
the OVR setting
2. Utility voltage is over the
Slow OVR setting during
operation
3. Incorrect country or Grid setting
4. Detection circuit malfunction
1.&2. Check the utility voltage on the inverter
terminal3. Check country & Grid setting
4. Check the detection circuit inside the
inverter
E13: Slow
Over Voltage
Range
1. Actual utility voltage is over
the OVR setting
2. Incorrect country or Grid
setting
3. Detection circuit malfunction
1. Check the utility voltage on the inverter
terminal
2. Check country & Grid setting
3. Check the detection circuit inside the
inverter
E26:Slow Over
Frequency
Range
1. Actual utility frequency is
over the OFR setting
2. Incorrect country or grid
setting
3. Detection circuit malfunction
1. Check the utility frequency on the inverter
terminal
2. Check country setting
3. Check the detection circuit inside the
inverter
E27:Slow
Under
Frequency
Range
1. Actual utility frequency is
under the UFR setting
2. Incorrect country or Grid
setting
3. Detection circuit malfunction
1. Check the utility frequency on the inverter
terminal
2. Check country & Grid setting
3. Check the detection circuit inside the
inverter
E28: Slow
Under Voltage
Range
1. Actual utility voltage is under
the UVR setting
2. Incorrect country or Grid
setting
3. Detection circuit malfunction
1. Check the utility voltage on the inverter
terminal
2. Check country & Grid setting
3. Check the detection circuit inside the
inverter
E30: DC Volt
Over Rating
1. Actual Solar1 voltage is over
550Vdc (RPI-H3) or 1000Vdc
(RPI-H5)
2. Detection circuit malfunction
1. Modify the solar array setting, and make
the Voc less than 550Vdc (RPI-H3) or
1000Vdc (RPI-H5)
2. Check the detection circuit inside the
inverter
E32: L/N
Reversed
1. Incorrect AC wiring
2. Incorrect AC connection
setting
1. Check if brown wire is connected to Line
and blue wire is connected to Neutral.
2. Check display “AC configurat.” setting
A01: DC Offset
Over Rating
1. Utility waveform is abnormal
2. Detection circuit malfunction
1. Check the utility waveform. Grid
connection of inverter need to be far away
from non-linear load if necessary
2. Check the detection circuit inside the
inverter
A05: NTC Over
Temp
1. The ambient temp. is over
60℃
2. Detection circuit malfunction
1. Check the installation ambient and
environment
2. Check the detection circuit inside the
inverter
A06: Inside
NTC Circuit
Fail
1. Ambient temp. >100℃ or
<-24℃
2. Detection circuit malfunction
1. Check the installation ambient and
environment
2. Check the detection circuit inside the
inverter
A08: Heat Sink
NTC1 Fail
1. Boost heat sink temp.
>100℃ or <-24℃
2. Detection circuit
malfunction
1. Check the installation ambient and
environment
2. Check the detection circuit inside the
inverter.
A09: Heat Sink
NTC2 Fail
1. Inverter heat sink temp.
>100℃ or <-24℃
2. Detection circuit malfunction
1. Check the installation ambient and
environment
2. Check the detection circuit inside the
inverter
A15:DSP ADC
Vgrid/Iout Fail
1. Auxiliary power circuitry
malfunction
2. Detection circuit malfunction
1. Check the auxiliary circuitry inside the
inverter
2. Check the detection circuit inside the
inverter
A16:DSP ADC
Vin/Vbus Fail
1. Auxiliary power circuitry
malfunction
2. Detection circuit malfunction
1. Check the auxiliary circuitry inside the
inverter
2. Check the detection circuit inside the
inverter
A17:DSP ADC
Iin/Iboost Fail
1. Auxiliary power circuitry
malfunction
2. Detection circuit malfunction
1. Check the auxiliary circuitry inside the
inverter
2. Check the detection circuit inside the
inverter
A18:RED. ADC
Vgrid Fail
1. Auxiliary power circuitry
malfunction
2. Detection circuit malfunction
1. Check the auxiliary circuitry inside the
inverter
2. Check the detection circuit inside the
inverter
A19:DSP ADC
Iout_dc Fail
1. Auxiliary power circuitry
malfunction
2. Detection circuit malfunction
1. Check the auxiliary circuitry inside the
inverter
2. Check the detection circuit inside the
inverter
A20:
Efficiency Inconsistent
1. The calibration is incorrect
2. Current feedback circuit is defective
1. Check the accuracy of current and power
2. Check the current feedback circuit inside the inverter
A22: Internal
Comm Fault_R
1. DSP is idling
2. The communication
connection is disconnected
3. The communication circuit
malfunction
1. Check reset and crystal in DSP
2. Check the connection between DSP and
COMM
3. Check the communication circuit
A24: Residual
Curr Over
Rating
1. PV array insulation fault
2. Large PV array capacitance
between Plus to Ground or
Minus to Ground
3. Either side of boost driver or
boost choke malfunction
4. Detection circuit malfunction
1. Check the insulation of Solar inputs
2. Check the capacitance (+ <-> GND & –
<-> GND), must < 2.5uF. Install an external
transformer if necessary
3. Check boost driver & boost choke
4. Check the detection circuit inside the
inverter
A25: Ground
Fault
1. PV array insulation fault
2. Large PV array capacitance
between Plus to Ground or
Minus to Ground or both.
3. Detection circuit malfunction
1. Check the insulation of Solar inputs
2. Check the capacitance, dry PV panel if
necessary
3. Check the detection circuit inside the
inverter
A27: RCMU
Circuit Fail
1. RCMU is disconnected
2. Detection circuit malfunction
1. Check the RCMU connection inside the
inverter
2. Check the detection circuit inside the
inverter
A28: Relay
Short
1. One or more relays are
sticking
2. The driver circuit for the
relay malfunction
1. Replace the defective relay(s)
2. Check the driver circuit inside the inverter
A29: Relay
Open
1. One or more relays are
abnormal
2. The driver circuit for the
relay malfunction
3. The detection accuracy is
not correct for Vgrid and Vout
1. Replace the defective relay(s)
2. Check the driver circuit inside the inverter
3. Check the Vgrid and Vout voltage
detection accuracy
A30: Bus
Unbalance
1. Not totally independent or
parallel between inputs
2. PV Array short to Ground
3. Driver for boost is defective
or disconnected
4. Detection circuit malfunction
1. Check the inputs connections
2. Check the PV Array insulation
3. Check the driver circuit for boost inside the inverter
4. Check the detection circuit inside the
inverter
A31: Bus_P
Over Volt
Rating
1. Driver for boost is defective
2. Voc of PV array is over
550Vdc (RPI-H3) or 1000Vdc
(RPI-H5)
3. Surge occurs during
operation
4. Detection circuit malfunction
1. Check the driver circuit for boost inside
the inverter
2. Modify the solar array setting, and make
the Voc less than 550Vdc (RPI-H3) or
1000Vdc (RPI-H5)
3. N/A
4. Check the detection circuit inside the
inverter
A33: Bus_N
Over Volt
Rating
1. Driver for boost is defective
2. Voc of PV array is over
550Vdc (RPI-H3) or 1000Vdc
(RPI-H5)
3. Surge occurs during
operation
4. Detection circuit malfunction
1. Check the driver circuit for boost inside
the inverter
2. Modify the solar array setting, and make
the Voc less than 550Vdc (RPI-H3) or
1000Vdc (RPI-H5)
3. N/A
4. Check the detection circuit inside the
inverter
A35: Bus Volt
Over Rating
1. Driver for boost is defective
2. Voc of PV array is over
550Vdc (RPI-H3) or 1000Vdc
(RPI-H5)
3. Surge occurs during
operation
4. Detection circuit malfunction
1. Check the driver circuit for boost inside
the inverter
2. Modify the solar array setting, and make
the Voc less than 550Vdc (RPI-H3) or
1000Vdc (RPI-H5)
3. N/A
4. Check the detection circuit inside the
inverter
A36:Output
Curr Transient
Over
1. Surge occurs during
operation
2. Driver for inverter stage is
defective
3. Switching device is defective
4. Detection circuit malfunction
1. N/A
2. Check the driver circuit in inverter stage
3. Check all switching devices in inverter
stage
4. Check the detect circuit inside the inverter
A37: AC Curr
Over Rating
Detection circuit malfunction Check the detect circuit inside the inverter
A42: CT
Current Sensor Fail
1.Inverter choke Fail
2.Output Filter Fail
3. Detection circuit malfunction
1. Check Inverter choke inductance.
2. Check output filter capacitance.
3. Check the detection circuit inside the
inverter
A45: HW
OOCP
1. WB1 WB2 misconnection.
2. Detection circuit malfunction
1. Check the connection of WB1 and WB2.
2. Check the detection circuit inside the
inverter
A50:Zero
Cross Circuit
Fail
The detection circuit for
synchronal signal malfunction
Check the detection circuit for synchronal
signal inside the inverter
A56:Hardware
Incompatibility
1. HW power rating incorrect 1. Check comm. HW power rating info.
A60: DC Curr
Over Rating
1. Switching device in boost is
defective
2. Driver for boost is defective
3. Input current detection circuit
malfunction
1. Check all switching device in boost
2. Check the driver circuit for boost inside
the inverter
3. Check input current detection circuit
A70: DC Curr
Transient Over
1. Switching device in boost is
defective
2. Driver for boost is defective
3. Input current detection circuit
malfunction
1. Check all switching device in boost
2. Check the driver circuit for boost inside
the inverter
3. Check input current detection circuit