Delta M42U

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3.4.5 DC side ground bar for 122 models

Figure 3-19: Mounting the DC side ground bar to WB

After installing the unit, locate the ground bar and associated screws in accessory

bag. Be sure to orient the ground bar as shown in Figure 3-19. Torque the mounting

screws to: 22 lbf-in (2.5 N.m)

The busbar accommodates grounding conductors in the range of 6AWG~4AWG

Torque grounding conductors to 26 lbf-in (3 N.m)

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Installation

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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

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