Delta RPI Series - User Manual

Questions and Answers:

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Wanda SinghAug 26, 2025
What causes 'Insulation' fault in Delta RPI Inverter and how to fix it?
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  Todd JensenAug 27, 2025
  An 'Insulation' fault in your Delta Inverter can stem from a few potential issues: a PV array insulation fault, in which case you should check the insulation of Solar inputs. It may also be caused by large PV array capacitance between Plus to Ground or Minus to Ground or both, so check the capacitance and dry the PV panel if necessary. Lastly, a detection circuit malfunction could be the reason; in that case, check the detection circuit inside the inverter.
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Maria BlackAug 26, 2025
How to resolve 'AC Freq Low' error on Delta Inverter?
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  Gary RodriguezAug 26, 2025
  If your Delta Inverter shows an 'AC Freq Low' error, it could be due to the actual utility frequency being under the UFR setting. Check the utility frequency on the inverter terminal. Another cause could be an incorrect country or Grid setting, so check those settings. Finally, a detection circuit malfunction could be the reason; in that case, check the detection circuit inside the inverter.
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Amanda BakerAug 26, 2025
How to fix 'AC Freq High' error on Delta Inverter?
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  Lisa ThompsonAug 26, 2025
  An 'AC Freq High' error on your Delta Inverter can be due to several reasons. The actual utility frequency might be over the OFR setting; check the utility frequency on the inverter terminal. An incorrect country setting could also cause this issue, so verify the country setting. Lastly, a detection circuit malfunction could be the cause; in that case, check the detection circuit inside the inverter.
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Robert LivingstonAug 25, 2025
What to do if my Delta RPI displays 'Temperature High'?
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  Sandy HuntAug 26, 2025
  If your Delta Inverter is showing a 'Temperature High' error, it may be due to the ambient temperature exceeding 60 degrees. Check the installation environment. Another potential cause is a detection circuit malfunction, which would require checking the detection circuit inside the inverter.
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David CharlesAug 25, 2025
Why is my Delta RPI Inverter showing 'AC Volt Low'?
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  jamie37Aug 26, 2025
  The 'AC Volt Low' error on your Delta Inverter may be triggered by several factors. First, the actual utility voltage might be below the UVR setting; if so, check the utility voltage connection at the inverter terminal. Second, incorrect country or Grid settings can cause this, so check these settings. Third, there may be wrong connections in the AC plug, so verify the connection in the AC plug. Lastly, a detection circuit malfunction could be the cause; in that case, check the detection circuit inside the inverter.
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Mrs. Christine MullinsAug 25, 2025
Why does my Delta Inverter show 'AC Volt High'?
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  kylebrayAug 25, 2025
  A 'AC Volt High' error on your Delta Inverter can occur if the actual utility voltage exceeds the OVR setting. Check the utility voltage on the inverter terminal. It can also happen if the utility voltage exceeds the Slow OVR setting during operation, so check that as well. An incorrect country or Grid setting could also be the cause, so verify those settings. Finally, a detection circuit malfunction could be responsible; in that case, check the detection circuit inside the inverter.
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smithhaleySep 4, 2025
What does 'HW CT A Fail' mean on my Delta RPI Inverter?
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  James PenningtonSep 4, 2025
  A 'HW CT A Fail' error on your Delta Inverter may be caused by a broken test current loop, so check the connection of WC3 to CNC16. It may also indicate that CSC1 is defective, so replay CSC1 with new one. Finally, a detection circuit malfunction could be the reason; in that case, check the detection circuit inside the inverter.
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Mitchell AdamsSep 7, 2025
What to do if my Delta RPI Inverter shows No Grid error?
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  nheathSep 8, 2025
  If your Delta Inverter is showing a No Grid error, it may be because the AC breaker is OFF or there is a disconnection in the AC plug. To fix this, switch on the AC breaker and check the connection in the AC plug, ensuring it is properly connected to the inverter.
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Cory MartinSep 7, 2025
What to do if my Delta RPI Inverter shows AC Volt Low error?
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  Patricia DawsonSep 7, 2025
  If your Delta Inverter is showing an AC Volt Low error, it could be due to several reasons: the actual utility voltage is under the UVR setting, an incorrect country or grid setting, wrong connections in the AC plug, or a detection circuit malfunction. To solve this, check the utility voltage connection to the inverter terminal, verify the country and grid settings, inspect the connection in the AC plug, and check the detection circuit inside the inverter.
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Natasha HarrisSep 7, 2025
What to do if my Delta RPI shows AC Volt High error?
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  James WardSep 7, 2025
  If your Delta Inverter displays an AC Volt High error, it could be due to several reasons. The actual utility voltage might be over the OVR setting, or it might be exceeding the Slow OVR setting during operation. Another cause could be an incorrect country or grid setting, or a detection circuit malfunction. To address this, check the utility voltage on the inverter terminal and verify the country and grid settings. Also, inspect the detection circuit inside the inverter.

Delta RPI Series Specifications

General

Efficiency	Up to 98.8% (depending on model)
Frequency	50 Hz / 60 Hz
Model	RPI Series
Type	Inverter
Protection Rating	IP65
Cooling	Natural convection
Category	Inverter
Cooling Method	Natural convection
Dimensions	Varies by model
Weight	Varies by model
Protection Features	Overvoltage, Short Circuit