Delta M42U

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M42U

M36U

M28U

Operation and Installation Manual

Grid-tie Transformerless Solar Inverter

The power behind competitiveness

www.deltaww.com

Table of Contents

Default Chapter3
- Table of Contents3
1 Safety10
- Information of the Inverter10
- Legal Provisions10
- Target Group10
- General Safety11
- Condition of Use11
- Symbols12
2 Introduction14
- Valid Model14
- Product Overview15
- Figure 2-2: Overview16
- Figure 2-3: Rating Labels of M42/36/28U17
- Table 2-2: Rating Label Explanation of M42/36/28U18
- Figure 2-4: External View and Wiring Box Layout for 120 Models19
- Figure 2-5: External View and Wiring Box Layout for 121 Models20
- Figure 2-6: External View and Wiring Box Layout for 122 Models21
- Figure 2-7: Wiring Box Layouts22
3 Installation23
- Mechanical Installation23
4 Commissioning51
- Display Operation Introduction51
- Figure 4-1: Front Panel Display51
- First Startup53
- Home Page54
- Main Menu54
- Power Meter55
- String Monitoring (120&122 Models)55
- Energy Log56
  - Event Log56
  - Inverter Information57
  - General Settings57
  - Install Settings58
    - Inverter ID59
  - Insulation59
  - Grid Code59
  - Figure 4-10: Inverter ID Screen Display59
  - Grid Settings60
  - Dry Contact Set-Up61
  - Potential Induced Degradation62
  - Residual Current Monitoring Unit (RCMU)62
  - Emergency Power-Off Enable62
  - AC Connection63
  - Anti-Islanding63
  - DC Arc Fault Circuit Interrupter (AFCI)63
  - Figure 4-17: AC Connection63
- Grid Code Confirm64
- Active / Reactive Power65
- Power Limit65
- Power Vs. Frequency65
- P(V)66
- Constant Cosphi67
- Cosphi (P)67
- Figure 4-26: Constant Cosphi Screens67
- Constant Q68
- Q(V)68
- FRT (Fault Ride Through)69
- Q(V)69
5 Maintenance70
- Removing and Replacing the Wiring Box (WB) Cover70
- Figure 5-1: Removing and Reinstalling the WB Cover70
- Removing the WB Cover71
- Replacing the WB Cover71
- Replacement of Surge Protection Devices (SPD)72
- Figure 5-4: Display Indicating AC and DC SPD Failure73
- Figure 5-5: Location of SPD Modules Inside Various WB Versions74
- Figure 5-6: Remove Screws as Indicated Unplug Connectors75
- Replace Internal String Fuse76
- Table 5-2: Combiner Fuse Specification76
- Figure 5-7: Fuse Holder Locations for 120/122 Models77
- Figure 5-9: String Monitor78
- Smart Fans Replacement and Filter Cleaning79
- Figure 5-10: Smart Fans Location on Power Module Chassis79
- Figure 5-11: Power Module Fan Tray80
- Power Module (PM) Fan Tray81
- PM Fan Tray Removal Procedure81
- Figure 5-12: Disassembling Fan Tray from PM Chassis (Showing One Side Only)82
- Procedures to Remove PM Air Inlet Filter83
- De-Commissioning84
6 Error Message and Trouble Shooting86
- Error Codes86
- Table 6-1A: Error Codes and Messages86
- Warning Codes87
- Fault Codes88
- Calling for Help92
- Service Call Checklist92
7 Technical Data93
- Technical of M42U Series93
- Technical of M36U Series94
- Technical of M28U Series95
- Communications96
- Certifications96
- Smart Inverter Functionality96
- General Data96
- Figure 7-1: Thermal Derating Curve of M42U97
- Figure 7-2: Thermal Derating Curve of M36U98
- Figure 7-3: Thermal Derating Curve of M28U99
Appendix A-1: Low and High Voltage Ride-Through Set-Points and Timing Per Table SA9.1100
APPENDIX: Grid Support Utility Interactive Inverters100
- Appendix A: CA Rule 21100
Appendix A-3: CA R21 Settings – Normal Ramp Rate (RR) & Soft-Start Ramp Rate (SS)101
Appendix A-5: CA R21 Settings - Specified Power Factor102
Appendix A-4: CA R21 Settings - Soft-Start Ramp Rate Test102
Appendix A-2: Low and High Frequency Ride-Through Set-Points and Timing Per Table SA10.1 100102
Appendix A-6: CA R21 Settings – Volt/Var Mode (Q(V))102
Appendix A-7: CA R21 Settings - Frequency-Watt (FW)103
Appendix A-8: CA R21 Settings – Volt-Watt (VW)103
Appendix B-1: Full Frequency Ride-Through Settings for O'ahu, Hawai'I Island, and Maui (HECO A)104
- Figure B-3: Details of HECO a & B: L/H VRT Via LCD Settings Menu106
- Appendix B: HECO104
Appendix B-2:Full Frequency Ride-Through Settings for Moloka'I and Lana'I (HECO B) 104107
Appendix B-3:Full Voltage Ride-Through Settings for O'ahu, Hawai'I Island, Maui, Moloka'I, and Lana'i104107
Appendix C-1: Assembly Note for All Model107
- Appendix C: Assembly Note107
Appendix C-2:Assembly Note for 120 Model109
Appendix C-3: Assembly Note for 121 Model109
Appendix C-4: Assembly Note for 122 Model110

Questions and Answers:

A
Amanda LynchAug 25, 2025
What should I do if my Delta M42U Inverter displays AC Volt Low (E10, E15, E20)?
- P
  Patrick LivingstonAug 25, 2025
  If your Delta Inverter displays 'AC Volt Low' (E10, E15, E20), the issue might stem from a few potential causes. Initially, verify that the actual utility voltage is within the suitable range, as it may be under the UVR setting. Also, incorrect Grid code or Grid settings could be the cause, so check them. Another potential cause is wrong connections in the AC terminal, so check the AC terminal connections. If these steps don't resolve the issue, there might be a detection circuit malfunction, in which case you should contact customer service for technical support.
M
Mrs. Christy JohnsonAug 25, 2025
Why does my Delta M42U Inverter show 'No Grid (E09)' error?
- W
  William HooverAug 26, 2025
  If your Delta Inverter is showing a 'No Grid (E09)' error, the possible causes are: 1. The AC breaker is OFF. In this case switch on the AC breaker. 2. There is a disconnection in the AC terminal. In this case check the connection in the AC terminal and ensure it connects to the inverter.
W
William KaneAug 26, 2025
How to fix AC Freq High (E01) error on my Delta M42U?
- R
  Richard WrightAug 26, 2025
  If the Delta Inverter displays 'AC Freq High (E01)', it could be due to several reasons: 1. The actual utility frequency is over the OFR setting, so check the utility frequency. 2. The Grid code setting is incorrect, so check it. 3. In case the issue persists, there may be a detection circuit malfunction, and you should contact customer service for technical support.
B
benjaminrobinsonAug 27, 2025
What causes AC Freq Low (E02) on my Delta M42U and how to resolve it?
- B
  Brandon ColeAug 27, 2025
  If your Delta Inverter displays 'AC Freq Low (E02)', the issue might be due to several reasons: 1. The actual utility frequency is under the UFR setting, so check the utility frequency. 2. The Grid code or Grid setting is incorrect, so check them. 3. If the issue persists, there may be a detection circuit malfunction, and you should contact customer service for technical support.
B
Brian BellAug 27, 2025
What does Insulation (E34) error mean on my Delta M42U Inverter?
- R
  Rachel AguilarAug 27, 2025
  If your Delta Inverter displays 'Insulation (E34)' error, possible causes include: 1. A PV array insulation fault, so check the insulation of Solar inputs. 2. Large PV array capacitance between Plus to Ground or Minus to Ground or both, so check the capacitance, and dry PV panel if necessary. 3. If none of the above steps work, there may be a detection circuit malfunction, and you should contact customer service for technical support.
G
Gregory PerryAug 28, 2025
Why is my Delta M42U Inverter showing a Temperature (F05) error?
- C
  christopherleeAug 28, 2025
  If your Delta Inverter shows 'Temperature (F05)' error, it may be due to: 1. The ambient air being over 60? (The installation is abnormal), so check the installation ambient and environment. 2. A detection circuit malfunction, and you should contact customer service for technical support.
A
Anthony LivingstonAug 29, 2025
What does AC Con. Fail (E08) error mean on my Delta Inverter?
- M
  Michael HamiltonAug 29, 2025
  If your Delta Inverter displays 'AC Con. Fail (E08)', it could be due to: 1. Wrong connection in AC terminal, so check the AC connection in accordance with the user manual. 2. A detection circuit malfunction, and you should contact customer service for technical support.
D
davidgriffithAug 30, 2025
What does DC Injection (F01, F02, F03) mean on Delta M42U Inverter?
- G
  griffinnathanAug 30, 2025
  If the Delta Inverter displays 'DC Injection (F01, F02, F03)', it might be because: 1. The utility waveform is abnormal, so check the utility waveform and ensure the grid connection of the inverter is far away from any non-linear load if necessary. 2. There is a detection circuit malfunction, and you should contact customer service for technical support.
G
George MoralesAug 30, 2025
How to troubleshoot Solar1 High (E30) error on Delta M42U?
- T
  Theresa MartinAug 30, 2025
  If your Delta Inverter shows 'Solar1 High (E30)', it might be caused by: 1. MPPT 1 input voltage being over 1000Vdc, so modify the solar array setting to make the Voc less than 1000Vdc. 2. A detection circuit malfunction, and you should contact customer service for technical support.
A
Antonio BauerAug 23, 2025
What to do if my Delta M42U Inverter shows AC Volt High (E11, E13, E16, E18, E21, E23)?
- H
  Holly HolmesAug 23, 2025
  If the Delta Inverter shows 'AC Volt High' (E11, E13, E16, E18, E21, E23), it could be due to several reasons. First, the actual utility voltage might be over the OVR setting, so check the utility voltage. Second, the utility voltage might be over the Slow OVR setting during operation, so check the Grid code and Grid setting. Third, the Grid code or Grid setting might be incorrect, so check the connection in the AC terminal. If none of these solves the problem, there may be a detection circuit malfunction, and you should contact customer service for technical support.

Delta M42U Specifications

General

Max. DC Voltage	1100 V
AC Voltage	400 V
Efficiency	98.6%
Output Voltage	400 V
Frequency	50/60 Hz
Communication Interface	Ethernet, RS485
MPPT Voltage Range	200-1000 V
Input Voltage	200-1000 V

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