Delta RPI-M20A User Manual (English)

Other manuals for Delta RPI-M20A

Quick Installation Guide24 pages

Manual63 pages

Questions and Answers:

D
Donald ChambersAug 31, 2025
What should I do if my Delta Inverter displays a 'Solar2 Low' error?
- C
  charles75Aug 31, 2025
  If your Delta Inverter shows a 'Solar2 Low' error, it might be because the actual Solar2 voltage is under the limit. Check the Solar2 voltage connection to the inverter terminal. If the actual Solar2 voltage is close to "0", it could indicate damage to some devices inside the inverter, so check all switching devices in boost2. Another possible cause is a detection circuit malfunction, requiring you to check the detection circuit inside the inverter.
M
Michael HamiltonAug 30, 2025
What to do if Delta RPI-M20A Inverter shows 'Solar1 Low' error?
- Y
  Yolanda BassAug 30, 2025
  If your Delta Inverter displays a 'Solar1 Low' error, first check the Solar1 voltage connection to the inverter terminal, as the actual Solar1 voltage may be under the limit. If the actual Solar1 voltage is close to "0", some devices inside the inverter may be damaged, so check all switching devices in boost1. Finally, a detection circuit malfunction could also be the cause; in that case, check the detection circuit inside the inverter.
J
johnhillAug 29, 2025
What does it mean when my Delta RPI-M20A Inverter says 'Solar2 High'?
- S
  Sierra GonzalesAug 29, 2025
  If your Delta Inverter is displaying a 'Solar2 High' error, it suggests that the actual Solar2 voltage is exceeding 1000Vdc. To resolve this, adjust the solar array setting to bring the Voc below 1000Vdc. Another possibility is a detection circuit malfunction, which would require checking the detection circuit inside the inverter.
F
fcampbellAug 29, 2025
Why does my Delta Inverter show 'Solar1 High'?
- E
  ewoodAug 29, 2025
  A 'Solar1 High' error on your Delta Inverter may indicate that the actual Solar1 voltage is over 1000Vdc. In this case, modify the solar array setting to ensure the Voc is less than 1000Vdc. Alternatively, the issue might be a detection circuit malfunction, requiring a check of the detection circuit inside the inverter.
F
Frederick MooreAug 28, 2025
What causes 'Insulation' fault in Delta Inverter and how to fix it?
- A
  Andrew SmithAug 28, 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.
M
Michael WongAug 27, 2025
How to resolve 'AC Freq Low' error on Delta Inverter?
- O
  ortizrebeccaAug 27, 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.
M
Michael CohenAug 27, 2025
How to fix 'AC Freq High' error on Delta Inverter?
- C
  Christopher BallardAug 27, 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.
J
jamesgordonAug 26, 2025
What to do if my Delta RPI-M20A Inverter displays 'Temperature High'?
- S
  seanfloydAug 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.
B
Brian BrownAug 25, 2025
Why is my Delta RPI-M20A showing 'AC Volt Low'?
- A
  Angela AshleyAug 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.
C
christinahuffAug 25, 2025
Why does my Delta RPI-M20A show 'AC Volt High'?
- D
  Danielle TorresAug 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.

Delta RPI-M20A Specifications

General

Brand	Delta
Model	RPI-M20A
Category	Inverter
Language	English

Summary

Safety Instructions

General Safety Precautions

Outlines important safety instructions, including cautions, warnings, and danger notices.

1. General Information

1.1. About this Manual

Provides explanation and procedures for installing, operating, maintaining, and troubleshooting solar inverters.

1.2. Product Description

Describes the 3-phase grid-tied solar inverter and its operation illustration.

1.3. Additional Information

Provides information on where to find more product details online.

2. Product Overview

2.1. Unpack the Inverter

Details the unpacking procedure for the RPI-M15A / M20A inverter.

2.2. Checking Unit and Accessories

Instructs users to check for damage and verify all included accessories.

2.3. Product Label

Explains how to identify the inverter's model and specifications from its label.

2.4. Exterior Objects

Illustrates the inverter's exterior components and input/output interfaces.

3. Installation

Wall Mounting Procedure

Details the steps for securely mounting the inverter onto a wall using brackets and screws.

Installation Guidelines and Clearance

Provides recommended installation orientation, clearance requirements, and environmental considerations.

4. Wiring

4.1. Preparation Before Wiring

Covers precautions and checks before commencing any wiring tasks.

4.2. AC Grid Connection

Explains the procedures and requirements for connecting the inverter to the AC grid.

4.3. DC Connection (from PV Array)

Details how to connect the DC input from the PV array to the inverter.

4.4. Communication Module Connections

Describes how to connect communication modules for data transfer and control.

4.4.1. RS-485 Connection

Explains the pin definitions and connection methods for RS-485 communication.

4.4.2. EPO and Dry Contact Connections

Details the connections for Emergency Power Off and Dry Contact features.

5. Turn On PV Inverter

5.1. LCD and Panel Indicators

Explains the inverter's LCD display and LED indicators for status.

5.2. First Startup

Guides the user through the initial setup and configuration process.

5.2.1. Home Page

Describes the main display screen showing output power, status, and energy data.

5.2.2. Power Meter

Details how to view AC and DC voltage, current, and power readings.

5.2.3. Energy Log

Explains how to access historical energy generation data on yearly, monthly, and daily bases.

5.2.4. Event Log

Describes how to view recorded error and fault events.

5.2.5. Operation Data

Explains how to view historical maximum and minimum operating data.

5.2.6. Inverter Information

Lists information such as serial number, firmware version, and inverter ID.

5.2.7. Settings

Introduces the section for adjusting various inverter functions and parameters.

5.2.7.1. Personal Settings

Allows adjustment of language, date, time, screen saver, and display contrast.

5.2.7.2. Coefficient Settings

Enables setting CO2 saving, earning value, and communication baud rates.

5.2.7.3. Install Settings

Covers advanced settings for installers, including ID, insulation, and country configurations.

5.2.7.4. Active/Reactive Power Control

Introduces functions for controlling active and reactive power output based on regulations.

5.2.7.5. FRT (Fault Ride Through)

Explains how to keep the inverter connected to the grid during voltage dips as per regulations.

6. Maintenance

6.1. Clean Fan

Provides instructions on how to clean the inverter's fans.

6.2. Replace Fan

Details the procedure for replacing a faulty fan unit.

6.3. Clean Air Outlets

Explains how to clean the air inlet and outlet filters.

7. Error message and Trouble Shooting

8. De-Commissioning

De-Commissioning Procedure

Outlines the procedures for safely removing the inverter from operation for maintenance or storage.

9. Technical Data

10. Assembly Note

Assembly Torque Specifications

Details screw torque specifications for fan and air inlet components.

Component Assembly Details

Provides details on AC wire, AC plug, rubber rings, MC4 wire, and communication module assembly.

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