Delta Electronics M42U, M36U, M28U, M80U, M60U Operation And Installation Manual

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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

1　Safety

　 1.1　 Information of the Inverter

　 1.1.1 Legal Provisions

　 1.1.2 Target Group

　 1.2　 General Safety

　 1.2.1 Condition of Use

　 1.2.2 Symbols 2　Introduction

　 2.1　 Valid Model

　 2.2　 Product Overview 3　Installation

　 3.1　 Mechanical Installation

　 3.1.1 Vertical wall mount

　 3.1.2 Horizontal or Tilt mount

　 3.1.3 Accessories

　 3.2　 Wiring box cover

　 3.3　 Electrical Installation for AC Wiring

　 3.3.1 AC Grid Types and Connections

　 3.3.2 Required Protective Devices for M42/36/28U AC Grid

　 3.3.3 AC wiring preparation (all models)

　 3.3.4 AC Switch Terminals –Prewire set-up

　 3.3.5 AC Wiring for all models

　 3.4　 Electrical Installation for DC Wiring

　 3.4.1 DC Wiring Installation for 120 models

　 3.4.2 DC Wiring Installation for 121 models

　 3.4.3 DC Wiring Installation for 122 models

　 3.4.4 Ground bar locations for 120/121 models

　 3.4.5 DC side ground bar for 122 models

　 3.5　 Communication Module Connections

　 3.5.1 Accessing the Communication Module

　 3.5.2 RS-485 Connection

　 3.5.3 EPO Function & Digital Input

　 3.5.4 Dry Contact connection

　 3.6　 On-site insulation test

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4　Commissioning

　 4.1　 Display Operation Introduction

　 4.2　 First startup

　 4.2.1 Home Page

　 4.3　 Main Menu

　 4.3.1 Power meter

　 4.3.2 String monitoring (120&122 models)

　 4.3.3 Energy Log

　 4.3.4 Event Log

　 4.3.5 Inverter Information

　 4.3.6 General Settings

　 4.3.7 Install Settings

　 4.3.7.1 Inverter ID

　 4.3.7.2 Insulation

　 4.3.7.3 Grid Code

　 4.3.7.4 Grid Settings

　 4.3.7.5 Dry Contact Set-up

　 4.3.7.6 Potential Induced Degradation

　 4.3.7.7 Residual Current Monitoring Unit (RCMU)

　 4.3.7.8 Emergency Power-Off Enable

　 4.3.7.9 AC Connection

　 4.3.7.10 Anti-Islanding

　 4.3.7.11 DC Arc Fault Circuit Interrupter (AFCI)

　 4.3.7.12 Grid code confirm

　 4.3.8 Active / Reactive power

　 4.3.8.1 Power Limit

　 4.3.8.2 Power vs. Frequency

　 4.3.8.3 P(V)

　 4.3.8.4 Constant cosphi

　 4.3.8.5 Cosphi (P)

　 4.3.8.6 Constant Q

　 4.3.8.7 Q(V)

　 4.3.9 FRT (Fault ride through)

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5　Maintenance

　 5.1　 Removing and replacing the Wiring Box (WB) cover

　 5.1.1 Removing the WB cover

　 5.1.2 Replacing the WB cover

　 5.2　 Replacement of Surge Protection Devices (SPD)

　 5.3　 Replace Internal String Fuse

　 5.4　 Smart Fans Replacement and Filter Cleaning

　 5.4.1 Power Module (PM) Fan Tray

　 5.4.1.1 PM Fan Tray removal procedure

　 5.4.1.2 Procedures to remove PM air inlet filter

　 5.5　 De-Commissioning

6　Error message and Trouble Shooting

　 6.1　 Error Codes

　 6.2　 Warning Codes

　 6.3　 Fault Codes

　 6.4　 Calling for Help

　 6.4.1 Service Call Checklist

7　Technical Data

　 7.1　 Technical of M42U series

　 7.2　 Technical of M36U series

　 7.3　 Technical of M28U series

　 7.4　 Communications

　 7.5　 Certifications

　 7.6　 Smart Inverter Functionality

　 7.7　 General Data

APPENDIX: Grid Support Utility Interactive Inverters

　 Appendix A: CA Rule 21

　 Appendix B: HECO

　 Appendix C: Assembly Note

101

105

108

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Figure 2-1: Components of M42U/M36U/M28U series

Figure 2-2: Overview

Figure 2-3: Rating labels of M42/36/28U

Figure 2-4: External view and Wiring box layout for 120 models

Figure 2-5: External view and Wiring box layout for 121 models

Figure 2-6: External view and Wiring box layout for 122 models

Figure 2-7: Wiring box layouts

Figure 3-1: Inverter dimensions

Figure 3-2: Mounting bracket dimensions

Figure 3-3: Required position for at least 8 screws

Figure 3-4: Permitted mounting positions

Figure 3-5: Prohibited mounting positions

Figure 3-6: Wall mount fixed prior to inverter

Figure 3-7: Stress/torque should be prevented when installing the inverter

Figure 3-8: Required mounting clearances

Figure 3-9: Screw locations to secure inverter WB to wall-mounting bracket

Figure 3-10: Installation method of shielding plate

Figure 3-11: Stripping guide for AC conductors

Figure 3-12: Location of AC terminals and wiring (all versions)

Figure 3-13: Location for DC terminals for 120 models

Figure 3-14: Location for DC terminals for 121 models

Figure 3-15: Guideline for aluminum conductor

Figure 3-16: Location for DC terminals for 122 models

Figure 3-17: DC Wiring illustration

Figure 3-18: Ground bar location for 120/121 models

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

Figure 3-20: Communication Module Layout

Figure 3-21: Location and access to Communication Module

Figure 3-22: Multiinverter connection illustration

Figure 3-23: EPO function terminal block

Figure 3-24: Dry Contact connection

Figure 3-25: Precautions for on-site insulation test

Figure

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Figure 4-1: Front Panel Display

Figure 4-2: Grid code, language and ID settings for first startup

Figure 4-3: Home Page screen

Figure 4-4: Power Monitoring and String Current Monitoring

Figure 4-5: Energy Log screen

Figure 4-6: Event Log screens

Figure 4-7: Inverter information screens

Figure 4-8: General Settings screen

Figure 4-9: Install settings Display screens

Figure 4-10: Inverter ID screen display

Figure 4-11: Insulation screen display

Figure 4-12: Grid Code screens

Figure 4-13: Grid Settings screens

Figure 4-14: Dry Contact screens

Figure 4-15: PID function Display screens

Figure 4-16: RCMU screen

Figure 4-17: AC Connection

Figure 4-18: Anti-Islanding Display screen

Figure 4-19: DC AFCI Display screen

Figure 4-20: Grid Code Confirm screens

Figure 4-21: Active / Reactive power screens

Figure 4-22: Power Limit screens

Figure 4-23: Power vs Frequency screens

Figure 4-24: Power vs Frequency parameter

Figure 4-25: P(V) screens

Figure 4-26: Constant cosphi screens

Figure 4-27: Cosphi (P) screens

Figure 4-28: Cosphi (P) curve

Figure 4-29: Constant Q screens

Figure 4-30: Q(V) screens

Figure 4-31: Q(V) parameter

Figure 4-32: FRT screens

Figure 4-33: FRT Parameter

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Figure 5-1: Removing and reinstalling the WB cover

Figure 5-2: Re-installing process for Wiring Box cover

Figure 5-3: AC and DC SPD modules

Figure 5-4: Display Indicating AC and DC SPD failure

Figure 5-5: Location of SPD modules inside various WB versions

Figure 5-6: Remove screws as indicated unplug connectors

Figure 5-7: Fuse holder locations for 120/122 models

Figure 5-8: Accessing the individual fuses

Figure 5-9: String monitor

Figure 5-10: Smart Fans location on Power Module chassis

Figure 5-11: Power Module Fan tray

Figure 5-12: Disassembling fan tray from PM chassis (showing one side only)

Figure 5-13: Removing the PM air inlet filter

Figure 7-1: Thermal Derating curve of M42U

Figure 7-2: Thermal Derating curve of M36U

Figure 7-3: Thermal Derating curve of M28U

Figure B-1: Procedure to confirm Grid Code via LCD – HECO A shown

Figure B-2: Details of HECO A: L/H FRT via LCD Settings menu

Figure B-3: Details of HECO A & B: L/H VRT via LCD Settings menu

105

106

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Table

Table 2-1: Packing list of M42U/M36U/M28U series

Table 2-2: Rating label explanation of M42/36/28U

Table 2-3: Wiring box layout description

Table 3-1: Definition of RS-485

Table 3-2: Terminal resister setting

Table 3-3: Definition of EPO function & Digital input

Table 4-1: LED indicator

Table 4-2: Programming keys and actions

Table 4-3: Inverter Functions

Table 4-4: Controls Access Levels

Table 4-5: Dry Contact Trigger Options

Table 5-1: SPD Specifications

Table 5-2: Combiner Fuse Specification

Table 6-1A: Error Codes and Messages

Table 6-1B: Error Codes and Messages

Table 6-2A: Warning Codes and Messages

Table 6-3A: Fault Codes & Messages

Table 6-3B: Fault Codes & Messages

Table 6-3C: Fault Codes & Messages

Table 6-3D: Fault Codes & Messages

Appendix A-1: Low and High Voltage Ride-Through Set-points and Timing per Table SA9.1

Appendix A-2: Low and High Frequency Ride-Through Set-points and Timing per Table SA10.1

Appendix A-3: CA R21 Settings – Normal Ramp Rate (RR) & Soft-Start Ramp Rate (SS)

Appendix A-4: CA R21 Settings – Soft-start ramp rate test

Appendix A-5: CA R21 Settings – Specified Power Factor

Appendix A-6: CA R21 Settings – Volt/VAr Mode (Q(V))

Appendix A-7: CA R21 Settings – Frequency-Watt (FW)

Appendix A-8: CA R21 Settings – Volt-Watt (VW)

Appendix B-1:

Full Frequency Ride-Through Settings for O’ahu, Hawai’i Island, and Maui (HECO A)

Appendix B-2:

Full Frequency Ride-Through Settings for Moloka’i and Lana’I (HECO B)

Appendix B-3:

Full Voltage Ride-through Settings for O’ahu, Hawai’i Island, Maui, Moloka’i, and Lana’i

Appendix C-1:

Assembly Note for All model

Appendix C-2:

Assembly Note for 120 model

Appendix C-3:

Assembly Note for 121 model

Appendix C-4:

Assembly Note for 122 model

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102

103

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107

108

109

110

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1　Safety

1.1 Information of the Inverter

1.1.1 Legal Provisions

1.1.2 Target Group

Copyright – DELTA ELECTRONICS, INC. - All rights reserved. This manual accompanies our product for use by the end users. The technical instructions and illustrations contained in this manual are to be treated as confidential and no part may be reproduced without the prior written permission of DELTA ELECTRONICS, INC. Service engineers and end users may not divulge the information contained herein or use this manual for purpose other than those strictly connected with correct use of the product. All information and specifications are subject to change without notice. DELTA ELECTRONICS, INC. shall have no obligation to either personal injury and property damage claims hereinafter with respect to any actions -- (a) the product has been installed and/or repaired improperly; (b) the product has been misused without following the instructions on this user manual; (c) the product has failed due to incorrect unpacking.

This - manual – is prepared for use by a well-trained technician for installing, commissioning, operation, and maintenance. The technician must have the following basic and advanced skills:

• Knowledge of the fundamentals of electricity, wiring, electrical components and electrical schematic symbols.

• Knowledge of how a solar inverter works and is operated.

•

Training in

the installation and commissioning of electrical devices and installations.

•

Training in

how to deal with the dangers and risks associated with installing

and using electrical devices and installations.

• Compliance with this manual and all safety information.

Safety

1.2 General Safety

- Please read these instructions carefully and save them for later use.

IMPORTANT SAFETY INSTRUCTIONS: SAVE THESE INSTRUCTIONS !

- The M42/36/28U is a transformerless solar inverter with dual independent MPPtracking inputs, each of which converts the variable direct current generated by the solar array into a utility frequency grid-compliant balanced three-phase AC current and feeds it into the utility grid.

- The Photovoltaic modules used must be compatible with the inverter. PV modules with a high parasitic capacitance to ground may only be utilized if the

capacitive coupling does not exceed 8μF. (For each MPPT channel)

- The inverter must only be operated in countries for which it is approved by Delta and the grid operator.

1.2.1 Condition of Use

- The design of this inverter is transformerless. There is no isolation transformer between the AC and DC sides, i.e., the product does not require galvanic isolation.

In order to function properly, any PV array connected must have its PV circuits isolated from ground, i.e., do not bond either side of the array to ground!

If a grounded PV array is connected to the inverter, the error message INSULATION

(E34) will appear on the display.

- It is prohibited to reference the L1, L2, or L3 terminal to ground; to do so will

damage the inverter and void the producr warranty.

ATTENTION: NO GALVANIC ISOLATION

To prevent personal injury and/or property damage, and also to ensure long term operation of the solar inverter, it is imperative this section be read carefully and all the safety instructions understood before using this inverter. This user manual provides important instructions for Delta grid-tie transformerless solar inverter. The product is designed, tested, verified, and certified according to international safety requirements, certifications, and standards but precautions must be observed when installing and operating the product. The inverter installation must be performed by an authorized electrician in accordance with the the National Electrical Code® ANSI/NFPA 70 or the Canadian Electrical Code® CSA C22.1 and/or other prevailing local codes, as well as OSHA requirements. This product is suitable for both indoor and outdoor use.

Safety

This section describes the definition of the symbols in this manual. In order to prevent both personal injury and property damage, and to ensure long-term operation of the product, please read this section carefully and follow all the safety instructions while you use the product.

1.2.2 Symbols

DANGER!

- This warning indicates an immediate hazard which will lead to death or

serious injury.

- This warning indicates a hazardous condition which may lead to minor injury.

CAUTION !

WARNING !

- This warning indicates a hazardous condition which may lead to death or

serious injury.

- This warning indicates a condition of potential damage to property and/or the

environment.

ATTENTION

Safety

- An exclamation mark enclosed in a double circle indicates additional important

information is contained in the following section and the user should follow the instructions to prevent any hazards.

INFORMATION

DANGER: ELECTRICAL HARZARD!!

- This warning indicates an immediate electrical hazard that unheeded can lead

to death or serious injury.

- This warning indicates a potential burn hazard.

- Use care when touching surfaces when operating the product.

- Do not perform any task until the product cools down sufficiently.

CAUTION: HOT SURFACES, DO NOT TOUCH!

- This icon indicates that a prescribed time delay must elapse before engaging in an indicated action.

- Patientez le délai requis avant d’entreprendre l’action indiquée.

- This symbol indicates the location of an equipment grounding conductor (EGC) terminal.

Safety

The user manual is valid for the following device types:

This user manual must be followed during installation, operation, and maintenance.

The overview of M42U/M36U/M28U Series each have three models as shown in Figure 2-2. Delta reserves the right to make modifications to the content and technical data in this user manual without prior notice.

2　Introduction

2.1 Valid Model

• M42U_120

• M36U_120

• M28U_120

• M42U_121

• M36U_121

• M28U_121

• M42U_122

• M36U_122

• M28U_122

The M42U/M36U/M28U transformerless 3Ø PV inverters are designed to enable the highest levels of efficiency and provide longest operating life by use of state-of-the-art high frequency and low EMI switchmode technology. They meet the design requirements of UL1741/SA, IEEE1547, IEEE1547.1, IEEE1547.A and OSHA, and is suitable for indoor or outdoor use.

- This product utilizes a transformerless design, and is not provisioned with an

isolation transformer, and therefore has no galvanic isolation between the DC and AC sides. PV array circuits connected must be floating with respect to ground, i.e., must not be referenced (bonded) to ground. If grounded PV arrays are connected to the inverter, the inverter will not connect to the grid and the error message INSULATION (E34) will appear on the display.

- It is prohibited to connect terminals L1, L2, or L3 to ground.

The inverter installation must be performed by an authorized electrician in accordance with the the National Electrical Code® ANSI/NFPA 70 or the Canadian Electrical Code® CSA C22.1 and/or other prevailing local codes, as well as OSHA requirements.

Introduction

The components of M42U/M36U/M28U is shown as Figure 2-1.

2.2 Product Overview

① ③② ④

Table 2-1: Packing list of M42U/M36U/M28U series

Figure 2-1: Components of M42U/M36U/M28U series

3 pcs

Screw

Ground bar mounting screws (122 Models) (Stainless/M5/21mm)

5 pcs

Screw

To secure inverter to mounting bracket (Stainless/M6/12mm)

Object Qty Description

1 Delta Solar Inverter 1 pc

1 pc

Solar inverter

2 Wiring Gland 1 pc For communication port wiring

6 Shielding plate 1 pair Shelding plate for filter (use is optional)

5 Name plate cover 1 set Name plate cover for display

3 User Manual

Important instructions for solar inverter Safety instructions should be followed during installation and maintenance

4 Mounting Bracket

Wall mounting bracket (Material: Aluminum/Thickness: 3mm)

Al Alloy Busbar 1 pc DC side PE/EGC Ground bar (122 Models)

8 MC4 connector

12 pairs String inputs for M42U

_122 model

10 pairs String inputs for M36U

_122 model

8 pairs String inputs for M28U_122 model

⑦⑥

⑨⑧ ⑩

For 122 model

⑤

BACK SIDE

Introduction

½" Opening for PE

AC Switch

Figure 2-2: Overview

Air Outlets / Smart Fans

Rating Label

DC Switch

2" gland for

DC Wiring

Air Inlets

RS-485

communications port,

3/4" TSO

½" Opening for

PE/EGC

2" AC Cable

Opening

AC Switch

LCD / LED Display

and Buttons

Air Outlets / Smart Fans

Rating Label

DC Switch

Air Inlets

MC4 type

DC connector

RS-485

communications port,

3/4" TSO

2" gland for

AC Wiring

LCD / LED Display

and Buttons

M42/36/28U_120

Air Outlets / Smart Fans

Rating Label

DC Switch

2" gland for

DC Wiring

Air Inlets

RS-485

communications port,

3/4" TSO

2" AC Cable

Opening

AC Switch

LCD / LED Display

and Buttons

M42/36/28U_121

M42/36/28U_122

Introduction

Figure 2-3 below, shows the rating labels of M42U/M36U/M28U series, and following in Table 2-2, there are definitions of the various symbols found on the labels. Figure 2-4 ~ Figure 2-6 illustrate the differences in the appearance between the various models.

Figure 2-3: Rating labels of M42/36/28U

Refer to table below for all models

DC terminal block is used / DC SW, AC SW, Fuse, String current monitor included.

DC terminal block is used / AC SW included, but no DC SW, no Fuse, no String current monitor

MC4 connector is used / DC SW, AC SW, Fuse, String current monitor included.

MxxU

_120

MxxU_121

MxxU_122

Introduction

Symbol Definition

FCC designation

Please read the user manual for further information

Danger: Electrical Hazard

This icon indicates that a prescribed time delay must elapse before engaging in an indicated action.Electrical hazard might exist before this duration.

Warning of the hot surface of the inverter

Table 2-2: Rating label explanation of M42/36/28U

In the following pages, Figures 2-4 through 2-6 illustrate the general layout of the M42/36/28U chassis and wiring box, and Figure 2-7 and Table 2-3, provides a detailed description of each wiring box option.

The Wiring Box area includes terminals for connection of the inverter input (DC) wiring, output (AC) wiring, RS-485 communication and other signal wiring, as well as DC & AC surge protection devices (SPD), DC switches, and fuse holders for some models.

Use noise protection PPE

ETL Listed Mark approved by Intertek Lab Certified as Grid Support Utility Interactive Inverter

Introduction

Dual MPPT channels, 6 strings/input

Dual MPPT channel, 5 strings/input

Dual MPPT channel, 4 strings/input

120

M42U

M36U

M28U

Figure 2-4: External view and Wiring box layout for 120 models

Introduction

Dual MPPT channels,

1 TB pair/input

Dual MPPT channels,

1 TB pair/input

Dual MPPT channels,

1 TB pair/input

121

M42U

M36U

M28U

Figure 2-5: External view and Wiring box layout for 121 models

Introduction

122

M42U

M36U

M28U

Figure 2-6: External view and Wiring box layout for 122 models

Dual MPPT channels, 6 strings/input

Dual MPPT channels, 5 strings/input

Dual MPPT channels, 4 strings/input

Introduction

Table 2-3: Wiring box layout description

Figure 2-7:Wiring box layouts

ComponentNO. NO.

2” cable opening for AC ½” cable opening for DC grounding

DC terminal for IN 1

DC terminal for IN 2

Component

7 8

NO. Component

Type II DC SPD

Internal AC terminal

Communication port Grounding (M6 threaded stud)

18 External ground bar location

1 2

Fuse holder type DC IN1

Internal DC terminal

Fuse holder type DC IN2

DC switch

MC4 connectors (12 pairs)

5 6

AC switch

2” cable opening for DC

DC grounding bar Type II AC SPD

IN 1

IN 2

IN 1 IN 2

-120 Model WB

-121 Model WB

-122 Model WB

⑰

⑩

⑫

⑬ ⑭

①

④

⑪

②

③ ③

⑰

⑫

③⑤

⑥ ⑦

④

⑬ ⑭

⑰

⑩

⑱

⑯

⑮⑯⑮

⑫

⑬ ⑭

①

⑪

IN 1IN 1 IN 2IN 2

⑨⑧

⑥

⑤

⑥

⑤

⑩

⑨

⑧ ⑩

⑨

⑯

Introduction

3 Installation

- In some locations, mounting the inverter in direct sunlight may cause the

inverter to enter a thermal derating mode. To eliminate this concern, a shade structure over the inverter chassis may be necessary.

CAUTION !

WARNING !

- Do not install the unit near or on flammable surfaces.

- Inverter must be mounted securely to a solid / smooth surface.

This unit is designed to be wall-mounted per Section 3.1.1 or Tilt Mounted per

Section 3.1.2.

Refer to Figures 3-2 through Figures 3-9.

1. Ensure the surface to which the unit is to be mounted is sufficiently strong enough to carry the weight.

2. Orient the wall bracket (Figure 3-2) horizontally (perpendicular to the floor), with the large plate at the bottom, and mark required mounting hole locations per Figure 3-3.

3. Secure the mounting bracket on the wall with at least 8 5/16” (M8) screws.

4. Hang the inverter on the wall mounting bracket.

Secure the inverter by inserting and tightening four screws (item 6, Figure 2-1)

as shown in Figure 3-9.

3.1 Mechanical Installation

3.1.1 Vertical wall mount

The chapter contains instructions for (1) Mechanical installation (2) Electrical Installation (3) Communication setup Figure 3-1 provides the mechanical dimensions of the inverter.

Installation

3.1.2 Horizontal or Tilt mount

- The mounting bracket shipped with the unit is specially designed and is the only

certified mounting device for mounting the inverter.

- Use a minimum of eight 5/16in (M8) screws to affix the mounting bracket to

mounting surface. See Figure 3-3.

CAUTION !

Refer to Figure 3-4. Ensure the mounting stand meets the mounting dimensions shown, with the large plate at the lowest end of the stand. Ensure the stand is sufficiently strong enough to carry the inverter weight.

2. For vertical installation, if the inverter is exposed to sunlight(without shading), a name plate cover must be installed to extend the lifetime of LCD display. Please refer to Figure 3-4 for an example of name plate cover.

3. For tilt installation, a name plate cover must be installed to add protection

against harsh environmental conditions such as: direct sunlight, hail, snow and

pecking from birds. Please refer to Figure 3-4 for an example of name plate cover.

4. Orient the mounting bracket (Figure 3-2) squarely on the inverter stand, and ensure cross-supports are located in line with the mounting screws locations shown in Figure 3-3 (horizontal case) such that they can all be secured. Mark required mounting hole locations per Figure 3-3.

5. Secure the mounting bracket to the stand with at least 8 x 5/16” (M8) screws.

6. Hang the inverter on the mounting bracket.

7. Secure the inverter by inserting and tightening four screws as shown in Figure 3-9.

Installation

Figure 3-1: Inverter dimensions

615 mm [24.2 in]

818 mm [32.2 in]864 mm [34 in]

275 mm [10.8 in]

615 mm [24.2 in] 275 mm [10.8 in]

120 & 121

Models

122

Models

Installation

Figure 3-2: Mounting bracket dimensions

796.4 mm [31.4 in]

739.4 mm [29.1 in]

611.9 mm [24.1 in]

50 mm [2.0 in]

246 mm [9.7 in]

410 mm [16.1 in]

205 mm [8.1 in]

400 mm [15.7 in]

Necessary for vertical mounting Necessary for horizontal mounting

Figure 3-3: Required position for at least 8 screws

Installation

Figure 3-5: Prohibited mounting positions

O: Permitted / X: Prohibited

Figure 3-4: Permitted mounting positions

NAME PLATE COVER SHIELD

A name plate cover must be installed.

Max. 90

Make sure the lowest point of the inverter chassis

must be ≥ 12” (30cm) from floor surface and

not susceptible to water immersion.

ROOF DECK

TYP SUPPORT STRUCTURE

NAME PLATE COVER

≧12” (≧30cm)

A name plate cover must be installed.

Installation

CAUTION !

Figure 3-6: Wall mount fixed prior to inverter

Figure 3-7: Stress/torque should be prevented when installing the inverter

1. Install the wall mount bracket to the rack system prior to installing the inverter Do not allow bending of rhe bracket. See Figure 3-6.

2. When installing the inverter on the rack system, use care not to apply excessive stress/torque as shown in Figure 3-7. It’s known that for most tilt installations, a rigid conduit body (e.g./ “LB”) will be applied to the AC side. Installer must exercise care when installing, as overstressing the chassis may open a path for water intrusion through the contact surface between the inverter module and the wiring box.

Installation

- Please follow the instructions above such as permitted positions and permitted mounting clearances for the correct installation.

CAUTION !

Figure 3-8: Required mounting clearances

> 50cm [19.69in]

> 33cm [12.99in]

Wall

Inverter

> 5cm [1.97in]

> 20cm [7.9in]

> 80cm [31.5in]

Figure 3-9: Screw locations to secure inverter WB to wall-mounting bracket

After installing the unit on the bracket, secure the wiring box to the bracket with four screws per Figure 3-9. Tighten the screws to a torque of 40 lbf-in (4.5 N.m)

> 80cm [31.5in]

Installation

Figure 3-10: Installation method of shielding plate

Included with the inverter hardware are two sheet metal side shields, which can be used to cover the open ends of the air inlet channel as shown in Figure 3-10, and are intended to minimize nesting in the air channel by wildlife. Two shields and associated screws are included. Use of the shields does not significantly reduce airflow into the inlet filter, as the rear side of the air channel is open, and thermal testing with the shields in place has verified there is no associated operational degradation or derating of the inverter due to their use as long as the rear access remains open. To use the shielding plate, please refer to the installation method in Figure 3-10. Tighten the screws to a torque value of 40 lbf-in (4.5 N.m)

①①

②②

①①

②②

3.1.3 Accessories

Installation

- Please check the front and the back of the name plate cover when installing. Small shade: The side with tape is back side. Large shade: The side with word "BACK SIDE" is back side.

- After sticking the name plate cover on the inverter, do not remove it in 1 hour to ensure the stickiness of the tape.

CAUTION !

Name plate cover

BACK SIDE

②

①

Clean the surface of the inverter. Peel off the double-sided tape.

① Inserter the small plate into the upper edge of the inverter. Make sure the back side(with tape) is facing inverter. ② Stick the plate on the inverter.

①

②

Push hard on the plate to ensure the stickiness.

① Insert the large plate into the bottom edge of the inverter. Make sure the front side(with folding) is facing you. ② Align screw holes to combine two plates.

Tighten these screws with torque 2 N.m

Installation

Remove name plate cover

If there is needed to monitoring or setting the display, please follow procedure below.

CAUTION !

②

①

① Separate the large plate. ② Pull out the large plate.

Loose two screws.

Start monitoring or using the display.

Installation

3.3 Electrical Installation for AC Wiring

DANGER: ELECTRICAL HARZARD!!

To avoid shock hazard during cabling, insure any live grid connections are removed

from the inverter.

- Wire sizes chosen for the AC conductors must meet ampacity requirements of NEC Section 310 or equivalent.

- Wiring method for the AC Installation must comply with the local electrical code.

- Failure to follow the instructions may result in damage to the inverter and AC conductors.

CAUTION: INVERTER AND EQUIPMENT DAMAGE MAY OCCUR !

WARNING !

- Installation and commissioning must be performed by a well-trained person (e.g.a licensed electrician) in accordance with local, state, and National Electrical Code ANSI / NFPA 70 requirements.

- Input and output circuits of this unit are isolated from the enclosure System grounding must be done in accordance with the National Electrical Code (NEC).

- Compliance to the local electrical code is the installer's responsibility.

- Inverter warranty void if the DC input voltage exceeds 1000 Vdc.

- The M42/36/28U solar Inverters must be connected to a 3-phase 480 Vac utility service. NEC 705.12(D)(1) requires that the inverter (every fixed appliance) must be connected to a separate, dedicated circuit breaker (or other approved OCPD) with no other outlets or devices connected to the same circuit (not shared by any other appliance).

CAUTION: POINT OF CONNECTION !

- This inverter may be damaged due to moisture or dust intrusion. DO NOT OPEN the power module section of the inverter.

ATTENTION

- In order not to damage the components in the inverter, ensure the correct conductor is connected to the appropriate AC switch on the inverter.

CAUTION: WRONG AC WIRING !

For first time installing/re-installing WB cover, in order to guarantee proper long-term operation of the inverter, procedures in Section 5.1 must be followed.

3.2 Wiring box cover

Installation

Figure 3-11: Stripping guide for AC conductors

Model Upstream circuit breaker

M42U ≧75A M36U ≧63A M28U ≧50A

3.3.1 AC Grid Types and Connections

The use of a Neutral (N) conductor is optional and depends the grid type and upon local codes. The default AC Grid connection is 3Ø-3W. If a neutral is required, this setting must be changed to 3Ø-4W via the front panel controls. The inverter will operate from the following grid connections without need of an external transformer:

Grid Type

480V/277V/ 3Ø-4W/Yg, 480V/277V/ 3Ø-4W/Y

480V/3Ø-3W/∆ (ungrounded)

ATTENTION

Inverter connection

3W or 4W +EGC 3W + EGC 3W +EGC

3.3.2

Required Protective Devices for M42/36/28U AC Grid

North American electrical codes require a dedicated over-current device such as a circuit breaker in line between the inverter and AC source.

3.3.3 AC wiring preparation (all models)

Below is the procedure for preparing the AC conductors for connection to the AC terminals (all versions):

• Ensure the AC conductors used are sized to the correct ampacity per NEC or other local code. Refer to Figure 3-11.

• Strip off all wires for 14 ~16mm [0.55~0.63in].

• The cross-sectional area for each internal cable is 6~4 AWG (14~22mm²).

• Do not use copper-aluminum terminals.

Conduit

to/from

AC Grid

Stripping length: 14 ~16mm [0.55~0.63in]

Conductor cross-section: 6~4 AWG (14~22mm²)

Conductor cross-section:

6~4 AWG (14~22mm²)

* The PE wire is rec ommended to use the same size (or the larger size) as L1, L2, and L3. (The maximum wire size is 2 AWG)

Installation

3.3.4 AC Switch Terminals –Prewire set-up

The AC switch terminals utilize cage-clamp design terminals and in order to insure proper connection of wiring, prior to inserting stripped conductors into switch terminals complete the following procedure to make terminals ready for connections. For each of the AC switch terminals (L1, L2, L3 and N):

1. Use a flatblade screwdriver loosen the cage-clamps by turning the clamp screw CCW until the screw reaches limit of rotation) If an electric screwdriver is utilized insure the torque setting is low enough to

NOT OVER-TORQUE the screw. Once screw bottoms out, do not turn it any further.

2. Verify visually the cage clamp is in the fully open position

For AL AC wires:

To make sure good conductivity, bi-metal adapter must be used in conjunction with aluminum wires.

Extreme temperature rise at the clamping point

If the contact resistance between the aluminum conductor and clamping point is too high, the clamping point can become very hot and even catch fire in extreme cases.

To ensure a safe and reliable contact, always perform the following work steps: Use a conductor cross-section at least one number larger due to the lower current-carrying capacity. Keep the installation location as free as possible from moisture or corrosive atmospheres. Connect the aluminum cables quickly.

Mechanically clean the stripped end of the aluminum conductor (using for instance a knife blade to scrape off the oxide layer). Then immediately dip the aluminum conductor into acid-fee and alkaline-free (=neutral) Vaseline and straight away insert it into the terminal block. Tighten the clamping screw in the clamping body with the maximum permissible tightening torque.

NOTICE

Please seal the conduit from inside the wiring box

by using duct seal to prevent living creature or

moisture enter the wiring box.

ATTENTION

EMT

Duct Seal

Installation

Figure 3-12 illustrates the location of the AC conduit entry and connections for AC terminal block:

- Open all AC switch cage-clamps as noted in Section 3.3.4

- Ensure the correct conductor is connected to the appropriate terminal.

- After conductor is inserted, tighten L1~N terminal with a torque value of 24 lbf-in (2.8 N.m), PE terminal with 31 lbf-in (3.5 N.m).

3.3.5 AC Wiring for all models

Figure 3-12: Location of AC terminals and wiring (all versions)

Torque 24 lbf-in (2.8 N.m) to fix the screw

AC switch (Terminal)

31 lbf-in (3.5 N.m) to fix the screw

2" cable gland for AC with EMT

EMT

Installation

DANGER: ELECTRICAL HARZARD!!

- PV array converts sunlight into electric power with high DC voltage and high DC current which can cause dangerous electrical shock hazard!

- Use an opaque material to cover the PV array before wiring or cabling.

- Ensure the correct polarities are connected when DC cabling is applied.

WARNING !

- The risk of electric shock and fire.

- Use only PV modules that are UL Listed to1000V or higher.

- Ensure the two DC switches are placed in the "OFF" position, and the PV array is disconnected when DC conductors are connected.

3.4 Electrical Installation for DC Wiring

- The PV Array current carrying conductors (positive or negative) must not be referenced to ground.

ATTENTION

- In order not to damage the components in the inverter, don’t repeat to change the status of DC Switch quickly, the correct operation is waiting for the LCD display show ”No DC” or turn on the switch after 1 minute later.

CAUTION: DC SWICH ON/OFF !

Please seal the conduit from inside the wiring box

by using duct seal to prevent living creature or

moisture enter the wiring box.

ATTENTION

EMT

Duct Seal

Installation

Figure 3-13: Location for DC terminals for 120 models

IN 1

IN 2

IN 1 IN 2

EMT

1½ " cable gland for DC with EMT

Stripping length: 10~11mm [0.40~0.43in] Conductor cross-section: 12~10 AWG (4~6 mm²) Torque 16 lbf-in (1.8 N.m) to fix the screw

½" Opening for PE

2" cable gland for DC with EMT

- Ensure all fuse holder terminals are tightened to the specified torque value of 16 lbf-in (1.8 N.m).

ATTENTION

• Ensure the DC conductors used are Cu and sized to the correct ampacity per NEC or other local code

• Strip off all wires for 10~11 mm [0.4~0.43 in].

• The cross-sectional area for each DC conductor is 12~10 AWG.

• Ensure the fuse holder terminal clamp is open

• Ensure correct conductor is connected to the correct fuse holder.

• Tighten each individual screw terminal screw to a torque value of 16 lbf-in (1.8 N.m).

• Two 2” chassis access holes (KOs) can be utilized to connect conduits from PV array DC wiring into the inverter, as shown in Figure 3-13.

• 120 models is compatible with 1000V/20A UL listed fuse.

Please read the following instructions for connecting DC terminals (120 models):

3.4.1 DC Wiring Installation for 120 models

AC Switch

Input 1 Fuse holders Input 2 Fuse holders

Installation

• These models are designed to be utilized with external combiner boxes and are not provisioned with internal DC combining capability.

• Specific size of DC conductors must be determined from NEC or other local codes.

•

The range of conductor sizes accommodated by each DC terminal is 8~2 AWG.

• Ensure the correct conductor is connected to its associated terminal.

•

Tighten each terminal block screw to a torque value of 8AWG - 40lbf-in (4.5N.m)

; 6~2 AWG - 110 lbf-in (12.4 N.m).

• The bending space is 160 mm [6.3in] which meets the safety standard.

• For the 121 model, two mounting options for installing the DC connection are available, bottom or side entry; both options have a 2" chassis access hole (KO). Side entry is shown in Figure 3-14.

Please read the following instructions for attaching DC terminals (121 models):

3.4.2 DC Wiring Installation for 121 models

Ensure the DC terminal block screws are tightened to a torque value of 8AWG - 40 lbf-in (4.5 N.m) 6~2AWG - 110 lbf-in (12.4 N.m)

- For aluminum cable : Min./max. Conductor cross-section 10 / 33.6 mm

Tightening torque 110 lbf-in (12.4 N.m)

ATTENTION

Figure 3-14: Location for DC terminals for 121 models

IN 1 IN 2IN 1 IN 2

DC Terminals

Stripping length: 17mm [0.67in] Conductor cross-section: 8~2AWG(8~33.6mm²) Torque: 8AWG

40 lbf-in (4.5 N.m)

6~2AWG

110 lbf-in (12.4 N.m)

AC Switch

EMT

2" cable gland for DC with EMT

Installation

Please follow the following guideline for cabling if you use aluminum cables.

Guideline for aluminum conductor :

- The oxide layer must be removed from the surface of the stripped aluminum conductor.

- The stripped aluminum conductor is greased with Vaseline or contact grease with comparable properties after oxide layer removed.

- Tightened with the maximum tightening torque for the modular terminal block.

- The installation location must be kept free from humidity or aggressive atmospheres.

- It is recommend to apply to sector-shaped single-strand conductor ; The conductor shape must match the sector-shaped connection

Figure 3-15: Guideline for aluminum conductor

match the sector-shaped of the connection

Sector-shaped

single-strand

90°

Installation

Figure 3-17: DC Wiring illustration

Please read the following instructions for connecting DC terminals (122 models):

• It is important to choose the proper size for DC cable.

• The cross-sectional area for each internal cable is 12~10 AWG (4~6mm²). DC wiring polarities are divided into positive and negative, which is shown in Figure 3-17. The connection shall be coherent with the indication marked on inverter.

3.4.3 DC Wiring Installation for 122 models

Figure 3-16: Location for DC terminals for 122 models

IN 1 IN 2IN 1 IN 2

PV-KST 4/6 Ⅱ

PV-KBT 4/6 Ⅱ

+04 +05 +06+01 +02 +03 -01 -02 -03 -04 -05 -06

Fuse Board 1

+04 +05 +06+01 +02 +03 -01 -02 -03 -04 -05 -06

Fuse Board 2

+01

-01

+03

+05

+02

+04

+06

+01

-01

+03

+05

+02

+04

+06

IN 1

IN 2

IN 1 IN 2

Installation

3.4.4

Ground bar locations for 120/121 models

Figure 3-18: Ground bar location for 120/121 models

Figure 3-18 shows the AC/DC grounding bar locations for the 120/121 models.

The wire gauge of the ground cable: 6AWG~4AWG Torque grounding cables to 26 lbf-in (3 N.m)

-120 Model WB

-121 Model WB

Installation

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)

①

②

Installation

The communication module of M42/36/28U is shown in Figure 3-20. It provides VCC, RS-485, dry contact, EPO, and Digital Input terminals for use in various applications. Details for each are presented below. There's a 12VDC source between VCC & GND for use with external device.

3.5 Communication Module Connections

Figure 3-20: Communication Module Layout

Dry Contact

VCC & RS-485 EPO*1 &

Digital Inputs*6

Terminal Resistor

Installation

The communication module consists of an assembly with a PCB and a plastic carrier. It is located in a slot through the bottom of the wiring box chassis. It is accessed from the bottom exterior of the wiring box. The carrier is secured to the chassis by two self-retaining screws. See Figure 3-21. To access the communication module, loosen the two self-retaining screws to loosen the carrier from the chassis. Once loosened completely, the card/carrier module can be withdrawn from the wiring box chassis by gently pulling the carrier straight out from the chassis. After pulling the desired signal cable(s) through the wiring gland provided or a connected conduit, and connected electrically as shown in the following sections, the module can be reinstalled by reversing the above directions. Ensure the assembly is oriented into the chassis so as to allow the edge connector to engage properly.

3.5.1 Accessing the Communication Module

Figure 3-21: Location and access to Communication Module

* Screw torque required for assembling:

7 lbf-in (0.8N.m)

Installation

The pin definition for the RS-485 terminal block is shown in

Table 3-1.

- Pins 1 and 2

provide a 12DC bus for use with accessories such as R3 Power Monitor.

- Pins 3 and 5 are both connected to the DATA+ input.

- Pins 4 and 6 are both connected to the DATA

input. These connections allow easy daisy-chaining of multiple inverters. A 120 ohm bus termination resistor and associated control switch are located on the communication board (See Figure 3-20) The switch function is as shown in Table 3-2. Different RS-485 connection scenarios require different set up for the 120 ohm bus termination resistor.

•

When several inverters are cascaded (i.e., "daisy-chained") only the last inverter

in the chain must have its bus termination resistor switched ON. Refer to

Figure 3-22.

•

If the length of any RS-485 bus is greater than 2000' (610m), the use of Belden 3105A cable (or eq.) is recommended to insure communication quality. (When using R3 Monitor, a 4-wire cable is required; Belden 3108A (or eq.) is recommended.)

3.5.2 RS-485 Connection

Pin Function

1 VCC (+12V)

2 GND

3 DATA+

4 DATA-

5 DATA+

6 DATA-

Table 3-1: Definition of RS-485

1 2 3 4 5 6

In order to have good transfer quality, twisted-pair wire is recommended to be used as communication cable.

ATTENTION

Installation

Figure 3-22: Multiinverter connection illustration

Data Format:

Baud rate: 19200 Data bits: 8 Stop bit: 1 Parity: N/A

RS485/USB

RS485/RS232

Terminal Resistor (Last inverter in chain must have Switch 2 in ON position.)

Switch 1

Terminal Resistor ON

Terminal Resistor OFF

OFF

Table 3-2: Terminal resister setting

Installation

The communication Module has an emergency power off function (EPO), and EPO enable can be found in the Install Settings page.

Once enabled, the EPO function can be used to turn off the inverter via a NO relay contact connected across terminal [V1 & K0]

Additionally, a digital power reduction control is available that can be set to limit the inverter's available active output power. The control settings for this function are made by placing a hardware short (jumper or relay) between two terminals of the terminal block shown in Table 3-3, below.

3.5.3 EPO Function & Digital Input

Figure 3-23: EPO function terminal block

Table 3-3: Definition of EPO function & Digital input

Inverter’s action

Emergency power off (EPO)

0% active power

Maximum 30% rated power

Maximum 60% rated power

Maximum 100% rated power

Reserved

Short terminals

V1 & K0

V1 & K1

V1 & K2

V1 & K3

V1 & K4

V1 & K5

V1 & K6

Installation

The M42/36/28U series provides a dry control contact pair that may be used to control external devices based on the status of operation of the inverter. The terminal block for this function is shown in Figure 3-24. The terminals marked in the figure identify the dry contact connection. The operation of the dry contact is normally open. The functionality of this contact can be customized by users via settings available in the Settings Menu.

3.5.4 Dry Contact connection

Figure 3-24: Dry Contact connection

Dry Contact

Position Not used

Installation

For customers who want to do on-site insulation test, please make sure:

1. The DC switches are in “OFF” position.

Apply one probe to the positions shown in Figure 3-25, the other to the ground. It might cause damages to the inverter if probes are applied to inappropriate positions.

3.6 On-site insulation test

Figure 3-25: Precautions for on-site insulation test

-120 Model WB

-121 Model WB

-122 Model WB

Hi-pot / InsulationHi-pot / Insulation

Hi-pot / Insulation

DC Switch

OFF

DC Switch

OFF

Hi-pot / InsulationHi-pot / Insulation

DC Switch

OFF

Installation

4 Commissioning

- Be careful of hot surfaces when operating the product!

- Do not perform any task until the unit cools down or appropriate personal protection gear is worn.

CAUTION: HOT SURFACES, DO NOT TOUCH!

4.1 Display Operation Introduction

M42/36/28U series include a front panel 4x20 character LCD display which includes four programming keys and 2 LEDs (located on the left-hand side of the LCD) that allow visual display of the inverter’s data and status as shown in Figure 4-1. Please refer to Table 4-1 for information as to the information provided by the LED indicators. Access to various screens and the adjustment of inverter settings are done using the LCD screen and the four programming buttons directly below the LCD screen, See Table 4-2 for programming descriptions of operation.

When adjusting settings, LCD panel will change the display cursor from “►” to

“ ”

Figure 4-1: Front Panel Display

LED Indicator (RED)

LED Indicator (GRN)

EXIT: Exit Menu

Down: Move Down

UP: Move UP

ENT: Enter Menu or Confirm

LCD screen

Commissioning

Condition Green LED Red LED

Countdown FLASH * OFF

Power ON ON OFF

Error or Fault OFF ON

Standby or Night time (No DC) OFF OFF

Bootloader mode FLASH *

* ON 1s / OFF 1s

Table 4-1: LED indicator

Table 4-2: Programming keys and actions

Symbol Action

ENT Enter a Menu or Confirm a programmed value

▲ Move cursor UP in menu or increase a programmed value

▼ Move cursor Down in a menu or decrease a programmed value

EXIT

Button

Enter

Down

Exit Exit Menu

Commissioning

The following sections indicate inverter status and settings as shown on the LCD display.

4.2 First startup

Figure 4-2: Grid code, language and ID settings for first startup

Are you sure to set Grid Code ::

IEEE1547 480V

Yes / ► No

Are you sure to set protocol :

Delta prot.

Yes / ► No

Are you sure to set ID : 1

Yes / ► No

Select Grid Code, 1741 SA-277V IEEE1547 480V IEEE1547.A 480V

►

Select Language, English Deutsch Français

►

Setting ID:

ID = 001

Pass: to Home page Fail: to Home page but in locked status and indicated“AFCI fail”

06. Oct 2018 15 : 33

AFCI

Self Testing . . .

AFCI Self Test

Result: Pass

When setting is

IEEE1547

Delta prot. Sunspec prot.

EXIT

ENT

EXIT

ENT

►

* AC Connection: 3P3W is factory default; see Section 4.3.7.9 for further details.

Yes / ►No

EXIT

ENT

EXIT

ENT

EXIT

ENT

EXIT

ENT

EXIT

ENT

At the time of initial startup, a First Start routine is started allowing user to set basic functions without need of a password. An appropriately sized PV array and an AC grid must be available and connected to the inverter. Procedure is as follows:

• Complete the appropriate system pre-commissioning procedure(s).

• Initially, ensure both DC switches are in OFF position, and interconnect the inverter to the AC grid by turning on internal and any external AC switches as required.

• Verify the inverter control system is powered by noting that the LCD display panel has become active.

• During the initial startup, when the LCD display become active, the inverter control will enter the First Start-up routine which allows installer to set Language, Grid code, RS-485 protocol and inverter ID (RS-485 address). Figure 4-2 below,

illustrates the display flow charts of the inverter startup.

• Using display and programming keys, set desired language and the country

(Grid Code) associated with the installation location and wait for the AFCI Self Test to complete.

• Verify AFCI self test result is a pass.

• Close both DC switches, and await inverter to complete its self test sequence,

which takes approximately two minutes.

•

Verify via the display there are no errors, faults or warning indications displayed

on the home page.

• If there is sufficient power available from PV array, inverter will connect to grid

and begin exporting power to the grid.

Commissioning

4.2.1 Home Page

Figure 4-3: Home Page screen

21 Jan. 2016 16:30 Status: : Power: E-Today:

42000 W 147 kWh

On Grid

Inverter Status

Output Power

Today Energy

Day -Time

After completion of First Start and inverter is in normal operation, the LCD will display the homepage screen as shown in Figure 4-3. The user can view information to include output power, inverter status, E-today, date and time.

Pressing "any" key in home page mode will open the main menu. To return to Home Page screen, press EXIT at main menu or wait 5 minutes without any key operation, the display will return to homepage.

Table 4-3 contains is a listing of all inverter functions that can be adjusted by users (U) and installers (I) via the LCD panel, and the associated manual subsection where a description of the operation of each is found.

4.3 Main Menu

Table 4-3: Inverter Functions

Function Para

Power Meter 4.3.1

Energy Log

String Current Mon

4.3.2

Event Log

4.3.3

Information

4.3.4

General Settings

4.3.5

Inverter ID

4.3.7

Insulation

4.3.7.1

4.3.7.2

Grid Code 4.3.7.3

Install Settings

4.3.6

Access

U,I

Function Para

Grid Settings 4.3.7.4

Dry Contact Set-up 4.3.7.5

PID 4.3.7.6

RCMU 4.3.7.7

AC Connection 4.3.7.9

Emergency Power-Off 4.3.7.8

AFCI 4.3.7.11

Grid code confirm 4.3.7.12

Active / Reactive power 4.3.8

Anti-Islanding 4.3.7.10

Access

Commissioning

This page displays voltage, current and power measurements from both the AC and DC side.

4.3.1 Power meter

4.3.2 String monitoring (120&122 models)

Figure 4-4: Power Monitoring and String Current Monitoring

V 480

I 50.5

P 13989

480

50.5

13989

480

50.5

13989

L1 L2 L3AC

Power. Frequency:: E-Today:

41966

0.9

60.00 147

kW Hz kWh

V 545

I 40.0

P 21800

545

40.0

21800

DC1 DC2DC

V A W

ENT

1: 2: 3:

8.0

8.1

7.9

4: 5: 6:

8.0

8.1

8.0

1: 2: 3:

8.0

8.1

7.9

4: 5: 6:

8.0

8.1

IDC1 (A)

IDC2 (A)

ENT

The string current monitoring function is accessed via the Power Meter menu Four sub-pages are accessed using display keys as shown in Figure 4-4, two pages display string current values for the nine strings of MPPT1 and MPPT2.

Commissioning

User can view the inverter’s lifetime energy runtime via Energy Log page.

4.3.3 Energy Log

Event Log display has two sub-pages as noted below and shown in Figure 4-6:

• Error Events page displays all the events (Error and Fault) and can show 30 records at a time.

• Grid Report page only displays the error that occurred at grid side, and it can show 5 records at a time.

4.3.4 Event Log

Figure 4-5: Energy Log screen

Figure 4-6: Event Log screens

Life Energy Day Energy Month Energy

►

Life Energy: E-Total: Runtime:

30680.02 kWh 7302 Hrs

Life Energy Day Energy Month Energy

►

Life Energy Day Energy Month Energy

►

EXIT

ENT

Day Energy:

2016.10.10

2016.10.09

2016.10.08

147 kWh 146 kWh 145 kWh

EXIT

ENT

Month Energy:

2016.10

2016.09

2016.08

4410 kWh 4409 kWh 4408 kWh

EXIT

ENT

1. 20/01/2016 15:30 AC Freq High

2. 19/01/2016 09:30

AC Volt Low

29. 18/01/2016 15:30 AC Freq High

30. 17/01/2016 09:30

AC Volt Low

Error Events Grid Report

►

Error Events Grid Report

►

1. 20/01/2016 15:30 AC Freq High

2. 19/01/2016 09:30

AC Volt Low

5. 18/01/2016 15:30 AC Freq High

Press ▲,▼&ENT > 5s

Clear Event Logs ?

Yes / ► No

Empty

Yes

No Event

Press ▲,▼&ENT > 5s

Clear Event Logs ?

Yes / ► No

Empty

Yes

No Event

EXIT

ENT

Commissioning

This page allows the user to view static data associated with the inverter to include serial number, installation date, inverter ID (RS-485 address), and firmware version. Additional parameters are accessed via connected menus using the up/dn keys. Programmed settings (e.g., Inverter ID, baud rate) are adjusted using the settings menu. The complete list of inverter information items can be seen in Figure 4-7, below.

4.3.5 Inverter Information

Figure 4-7: Inverter information screens

This page allows the setting of Language, Date and Time, and RS-485 baud rate via sub-menus. Use UP/DN arrow keys to navigate to desired sub-menu, and then press ENT to enter the chosen sub-menu.

4.3.6 General Settings

Figure 4-8: General Settings screen

S/N: RN11179CB0 Install: 01/01/2016 INV ID: 1

AC connection: Max. Power: Dry Cont A: Dry Cont B:

3P3W

46000W

Disable Disable

FW Version DSP: COM: SCM:

1.30

91.05

1.35

RED: ARC:

61.06

1.05

►

EPO Normal Open Grid Settings Active Pwr Settings React Pwr Settings

ENT

►

EPO Normal Open Grid Settings Active Pwr Settings React Pwr Settings

►

EPO Normal Open Grid Settings Active Pwr Settings React Pwr Settings

FRT Settings

ENT

Country:

Insulation: Baud Rate:

IEEE1547 480V

100

19200bps

►

Language Date and Time Baud Rate Protocol

►

Commissioning

4.3.7 Install Settings

To enter Install Settings page, users must enter a valid password, which must be obtained from Delta Electronics. There are three sets of password with different permissions: User Level, Installer Level, and Manufacturer Level. The following sub-sections will introduce the parameters settings accessible from the User and Installer level menus of the Install Settings page.

Figure 4-9: Install settings Display screens

Table 4-4: Controls Access Levels

- Changing the settings in the Install Settings page can result in damage to the inverter and other equipment. These settings must only be adjusted by qualified installers or engineers.

CAUTION !

AFCI* ON Return to Factory

►

EPO* AC Connection Anti-islanding Max. Power

►

Normal Open

3P3W

46000W

DC Injection Dry Cont. PID Function* RCMU*

►

Insulation

Inverter ID: 1 Insulation Grid Code Grid Settings

►

- Inverter ID

User Level:

- Insulation

- Grid Code

- Dry Contact

- PID Function*

- EPO*

*PID

*RCMU

*EPO

*AFCI

Potential Induced Degradation (see section 4.3.7.6)

Residual Current Monitoring (see section 4.3.7.7)

Emergency Power Off function (see section 3.5.3)

DC arc fault current interrupter (see section 4.3.7.11)

- Max. Power

- AC Connection

- All above User Level plus

Installer Level:

- Grid Settings

- Active Power Settings

- Reactive Power Settings

- DC Injection

- RCMU*

- Anti-Islanding

- All above Installer Level Settings

Manufacturer/Factory Level:

Commissioning

Figure 4-10: Inverter ID screen display

Figure 4-11: Insulation screen display

Inverter ID is the RS-485 address which is assigned to the inverter and used when the RS-485 communication system is operating, e.g., connected to a PC or data logger. If several inverters are connected to the RS-485 bus, each must have a distinct Inverter ID. Allowable ID values are 1-254. Consult data logger manufacturer to determine maximum number of inverters on a single RS-485 bus.

Prior to connecting to grid, the inverter control will measure the impedance between the floating PV array(s) and ground (PE), also known as isolation resistance, RISO. This measurement is compared to an internal limit and used to determine if any ground fault is present in the array prior to connection of the inverter to the grid. The inverter will not connect to the grid if the measured resistance is smaller

than 100kΩ.

4.3.7.1 Inverter ID

4.3.7.2 Insulation

Setting ID:

ID = 0

Inverter ID: 1 Insulation Grid Code Grid Settings

►

EXIT

ENT

Mode: ON Resistance: 100kΩ

►

ON DC1 only DC2 only OFF

►

EXIT

ENT

The grid code setting is used to program the inverter control system to be consistent with the grid voltage, frequency and basic grid configuration of the country or locale where installed. In NA, the grid code setting is IEEE 1547 480V.

4.3.7.3 Grid Code

Inverter ID: 2 Insulation Grid Code Grid Settings

►

1741 SA-277V IEEE1547 480V IEEE1547.A 480V HECO A

EXIT

ENT

Figure 4-12: Grid Code screens

Commissioning

4.3.7.4 Grid Settings

Figure 4-13: Grid Settings screens

Inverter ID: 2 Insulation Grid Code Grid Settings

►

Voltage Protection Freq. Protection Reconnect T P Ramp Up

►

High Off High On High Off T Low Off

►

575.0V

523.0V

0.1s

240.9V

Low On Low Off T Hi Off Slow Hi On Slow

►

427.9V

0.1s

526.0V

523.0V

Hi Off Sl T Lo Off Slow Lo On Slow Lo Off Sl T

►

1.0 s

421.9V

427.9V

2.0 s

Voltage Protection Freq. Protection Reconnect T P Ramp Up

►

High Off High On High Off T Low Off

►

62.05Hz

60.50Hz

0.1s

57Hz

Low On Low Off T Hi Off Slow Hi On Slow

►

57.05Hz

0.1s

65.00Hz

64.95Hz

Hi Off Sl T Lo Off Slow Lo On Slow Lo Off Sl T

►

5.0s

57.00Hz

57.05Hz 300 .0s

600s

6000%/m

600s

6000%/m

If user enters wrong settings

Wrong Settings

If user enters wrong settings

Wrong Settings

Press ▲&▼ 5s

Do you want to set

U to the max range?

Yes / ►No

Do you want to set

F to the max range?

Yes / ►No

Press ▲&▼ 5s

EXIT

EXIT EXIT

EXIT

ENT

ENTENT

This menu item allows the installer or an engineer to enable and/or adjust specific "smart inverter" (aka, CA Rule 21 or HECO functionality) grid parameters to include low/high voltage ride-through(L/HVRT), low/high frequency ride-through (L/HFRT), Soft start and ramp rates. Refer to Figure 4-13. Further details of this functionality is provided in Appendix A and B.

Commissioning

4.3.7.5 Dry Contact Set-up

Dry Contact Trigger Timing

No action.

Inverter is connecting to grid.

Fan Fail occurs.

Insulation test fail.

Any error, fault, or warning occurs.

Any Error occurs.

Any Fault occurs.

Setting

Disable

On Grid

Fan Fail

Insulation

Alarm

Error

Fault

Any Warning occurs.Warning

Table 4-5: Dry Contact Trigger Options

Figure 4-14: Dry Contact screens

EXIT

ENT

DC Injection Dry Cont. PID Function

►

RCMU ON

►

Alarm Error Fault Warning

►

Disable On Grid Fan Fail Insulat.

Dry Cont. A Dry Cont. B

Disable

System provide a dry contact to allow users to create a hardwired control, Users can choose the trigger condition of the dry contact. There are 8 options in the settings page: Disable, On Grid, Fan Fail, Insulation, Alarm, Error, Fault, and Warning. Please refer to Table 4-5 for more details about these options.

Commissioning

4.3.7.6 Potential Induced Degradation

4.3.7.7 Residual Current Monitoring Unit (RCMU)

4.3.7.8 Emergency Power-Off Enable

RCMU (Residual Current Monitoring Unit) monitors DC and AC residual current and inverter is disconnected from grid when residual current is high enough. The default setting of RCMU is “ON”.

The inverter has an Emergency Power-Off function (EPO), which once enabled, can be used to turn off the inverter via an external control signal. See Section 3.5.3 for additional details.

Figure 4-15: PID function Display screens

Figure 4-16: RCMU screen

DC Injection Dry Cont. PID Function RCMU

►

Time:

►

1 Hours

EXIT

ENT

DC Injection Dry Cont. PID Function RCMU

►

PID (Potential Induced Degradation) is a phenomenon which puts a high level negative voltage on PV module and make PV module performance low. The default action time of PID is set with 0(it means disable PID function), user can set the time from 0-10 Hours or Auto. It will be started the function at 30 minutes after No DC, and will be stop the function when DC voltage is input.

Commissioning

Figure 4-17: AC Connection

The AC Connection sub-menu provides user a choice of AC connections:

· 3P3W - indicates the inverter connection to an AC grid is as a 3-phase/3-wire device (default setting) No Neutral is required.

· 3P4W - indicates the inverter connection to an AC grid is as a 3-phase/4-wire device; Neutral connection required.

4.3.7.9 AC Connection

-islanding

Max.

EPO AC Connection Anti

Power

►

Normal Close

3P3W

46000W

Figure 4-18: Anti-Islanding Display screen

Anti-islanding protection is a way for the inverter to sense when there is a problem with the power grid, such as a power outage, and shut itself off to stop feeding power back to the grid. Delta anti-islanding function is based on the Sandia Frequency Shift algorithm. The default setting depends on grid code (always ON in NA).

4.3.7.10 Anti-Islanding

-islanding

Max.

EPO AC Connection Anti

Power

►

Normal Close

3P3W

46000W

Figure 4-19: DC AFCI Display screen

AFCI (Arc Fault Circuit Interrupter) is an advanced circuit breaker that breaks the circuit when it detects a dangerous electric arc in the circuit it protects to prevent electrical fires. The default setting of AFCI is “ON”.

4.3.7.11 DC Arc Fault Circuit Interrupter (AFCI)

AFCI Return to Factory

►

Commissioning

User can confirm grid code parameters as following, such as voltage and frequency protection parameters. More detail of F/VRT will be show in appendix.(For HECO and Rule 21).

4.3.7.12 Grid code confirm

Figure 4-20: Grid Code Confirm screens

S/N: RN11179CB0 Install: 01/01/2016 INV ID: 1

►

Meter Energy Log Event Log Inverter Info.

EXIT

ENT

Country:

Insulation: Baud Rate:

HECO A

100k

Ω

19200bps

FW Version DSP: COM: SCM:

1.30

91.05

1.35

RED: ARC:

61.06

1.05

AC connection: Max. Power: Dry Cont A: Dry Cont B:

3P3W

46000W

Disable Disable

►

EPO Normal Open Grid Settings Active Pwr Settings React Pwr Settings

Commissioning

Figure 4-21: Active / Reactive power screens

Figure 4-22: Power Limit screens

Figure 4-23: Power vs Frequency screens

A password is required to enter Active / Reactive Power page. This page includes two kinds of function: active power control and reactive power control. In active power control function, there are 3 control modes: Power Limit, Power vs. Frequency, and P(V). In reactive power control function, there are 4 control modes: Constant cosphi, cosphi(P), Constant Q, and Q(V). These modes will be introduced in next section.

- All function’s voltage settings used by phase voltage. -

This control mode can reduce the output power to a percentage of inverter’s rated power. Users can limit the output power by set the Set Point in Power Limit page.

Inverter will reduce output power when grid frequency rises up if this mode enabled. Users can tune the parameters in Power vs. Frequency page to change the inverter’s behavior.

Power Limit Power vs. Frequency P(V)

►

Mode: Set Point:

►

100%

EXIT

ENT

Power Limit Power vs. Frequency P(V)

►

Mode F start F recovery Gradient

►

60.20 Hz

60.15 Hz 100%

T recovery

►

300s

EXIT

ENT

Active Power Ctrl Reactive Power Ctrl

►

Warning:

Adj. would affect

energy production.

Password:

＊＊＊＊

EXIT

ENT

4.3.8 Active / Reactive power

4.3.8.1 Power Limit

4.3.8.2 Power vs. Frequency

Commissioning

start =

(Hz)

Gradient

recoveryfprotection

Figure 4-24: Power vs Frequency parameter

Figure 4-25: P(V) screens

When grid voltage rises up to a lock-in voltage(V lock-in) and inverter’s present output power is greater than lock-in power(P lock-in), inverter will reduce the output power and keep it at a certain value(P lock-out) until grid voltage drop back to lock-out voltage(V lock-out) and passing a certain time(T recovery).

Power Limit Power vs. Frequency P(V)

►

Mode P lock-in P lock-out V lock-in

►

OFF 20%

528.2V

V lock-out T recovery

►

519.6V 300s

EXIT

ENT

4.3.8.3 P(V)

Commissioning

Inverter can feed in a fixed reactive power to grid. Users can set the power factor(cosphi) in Constant cosphi page.

Cosphi (P) is a function that inverter will feed in reactive power when its output active power reach the setting values. When grid voltage reach the lock-in voltage(V lock-in), inverter will enable cosphi (P) function automatically and disabled it when grid voltage reach lock-out voltage(V lock-out).

►

Constant cosphi Cosphi (P) Constant Q Q(V)

Mode cosphi

►

OFF

Ind 1.00

EXIT

ENT

Figure 4-26: Constant cosphi screens

Figure 4-27: Cosphi (P) screens

►

Constant cosphi Cosphi (P) Constant Q Q(V)

Mode Q upper P lower Q lower

►

OFF

Ind 1.00

45%

Ind 0.90

P upper V lock-in V lock-out

►

90%

0V 0V

EXIT

ENT

Q upper

Q lower

P/Pn

cosφ

P lower P upper

Figure 4-28: Cosphi (P) curve

4.3.8.4 Constant cosphi

4.3.8.5 Cosphi (P)

Commissioning

Figure 4-29: Constant Q screens

Figure 4-30: Q(V) screens

Like Constant cosphi function, users can assign a percentage of reactive power in Constant Q page.

Q(V) is a control mode that inverter will provide reactive power according to grid voltage.

►

Constant cosphi Cosphi (P) Constant Q Q(V)

Mode Fix Q

►

OFF

Ind 90%

EXIT

ENT

►

Constant cosphi Cosphi (P) Constant Q Q(V)

Mode V1s V2s Qs limit

►

OFF

479.7V

528.2V

Ind 44%

V1i V2i Qi limit T delay

►

479.7V

403.5V

Cap 44%

10.00s

P lock-in P lock-out

►

0% 0%

EXIT

ENT

4.3.8.6 Constant Q

4.3.8.7 Q(V)

Commissioning

►

General Settings Install Settings Active/Reactive Pwr FRT

Mode Dead Band Vdrop t1

►

OFF

-10% 0%

0.30s

U1 t3 K factor

►

20%

3.00s

2.0

Warning:

Adj. would affect

energy production.

Password:

＊＊＊＊

EXIT

ENT ENT

i limit

s limit

Figure 4-31: Q(V) parameter

Figure 4-32: FRT screens

Figure 4-33: FRT Parameter

Some area requests that inverter should keep connected to grid when grid voltage drops suddenly in few seconds. In these areas, users can enable FRT function and adjust the parameters to meet the requirement.

100%

Fault occurrence

time

grid/Unom

Umin

Udrop

Disconnect from grid

Stay connected

4.3.9 FRT (Fault ride through)

Commissioning

5　Maintenance

Please check the unit regularly. If there are any impaired or loose parts, please contact your solar installer. Ensure that there are no fallen objects in the path of the heat outlet.

WARNING !

- Prior to beginning any maintenance procedures switch AC and DC power off to avoid risk of electrical shock!

Figure 5-1: Removing and reinstalling the WB cover

In order to guarantee proper long-term operation of the inverter, the following procedures must be followed used to remove and re-install the WB cover, Refer to Figure 5-1.

5.1

Removing and replacing the Wiring Box (WB) cover

OFFOFF

OFF

Maintenance

5.1.1 Removing the WB cover

• Never attempt to remove the WB cover in rainy damp weather without weather protection around the inverter.

• Switch AC and DC power off and wait until LCD display turns off.

• Loosen the 4 screws on the WB front cover and remove cover.

• Use care not to contaminate the WB cover gasket and mating surfaces

After removing the WB cover, do not leave the WB uncovered for long periods of time.

5.1.2 Replacing the WB cover

Before re-installing the wiring box (WB) cover:

1. Ensure mating surfaces and gasket are clean

2. The gasket is properly located and aligned in its mounting slot.

When re-installing the wiring box cover:

1. Hand tighten screws cross wise and equally.

2. Fully tighten the WB cover screws to 21 in-lb of torque (2.37N-m)

After re-installing the wiring box (WB) cover:

Use care to ensure the WB cover screws are started properly and not cross-threaded.

2. After tightening, check that screw heads are flush with cover

Figure 5-2: Re-installing process for Wiring Box cover

* Attention to the orientation of the cover

Maintenance

M42/36/28U series models have the surge protection device (SPD) at both AC and DC side as shown in Figure 5-3. Table 5-1 summarizes the specifications of AC and DC SPD.

5.2 Replacement of Surge Protection Devices (SPD)

Figure 5-3: AC and DC SPD modules

Table 5-1: SPD Specifications

Description Value

AC Module

Working voltage:

DC Module

Working Current (8/20us)

Operating Ambient Temperature Range

Rated Current (IMAX – 8/20us)

895VRMS

1175VDC

10kA

-40°C to 85°C

20kA

Sichuan Zhongguang Lightning Protection Technologies Co., Ltd

Manufacturer:

If it's necessary to remove the insulator plate

of wiring box during Cabling or maintenance,

the insulator plate must be put back in to the

wiring box before re-install the cover, refer the

figure right.

Insulator plate

WARNING !

Maintenance

17 Mar. 2016 03:14 Status: Power: E-Today:

AC Surge

0kW 0kWh

17 Mar. 2016 03:14 Status: Power: E-Today:

DC Surge

0kW 0kWh

Surge protection devices (SPD) are designed to protect sensitive circuit elements of the inverter from damage caused by lightning and other electrical transients/surges, as such they are sacrificial components and periodically, may need replacement.

The SPDs are located in the inverter wiring box (WB) on both AC and DC input terminals. If a warning message “AC Surge” or “DC Surge” appears on display panel, follow the procedure below to replace the SPD.

• Determine which SPD unit is damaged. See Figure 5-4. AC SPD: “AC Surge” with show on the corner of the LCD panel. DC SPD: “DC Surge” with show on the corner of the LCD panel.

Figure 5-4: Display Indicating AC and DC SPD failure

Maintenance

Figure 5-5: Location of SPD modules inside various WB versions

AC SPD DC SPD

• Accessing the Wiring Box

1. Switch AC and DC power off and wait until LCD display turns off.

2. To access the wiring box, use procedure found in Section 5.1.1 Do not leave the WB uncovered for long periods of time.

• Changing the SPD modules - use the following procedure: The AC and DC SPD units are located as shown in Figure 5-5.

• To remove the defective SPD, refer to Figure 5-6

1. Disengage the white wiring connector from the SPD PCB (3-pin on AC SPD or the 2-pin on DC SPD).

2. Remove four Phillips head screws at the front (terminal block) side of the SPD PCB.

3. Remove the single Phillips head screw located on the left (DC) or right (AC) side of the SPD PCB.

4. Lift and remove the entire SPD PCB and replace with new unit.

5. Install the new SPD using the above procedure in reverse order. Tighten the five screws to a torque value of 15 lbf-in (1.7 N.m).

• Re-installing the Wiring Box cover To re-install the WB cover, use the procedure found in Section 5.1.2

Maintenance

Figure 5-6: Remove screws as indicated unplug connectors

DC SPDs

AC SPDs

Maintenance

M42/36/28U 120 and 122 models both have a wiring box provisioned with two independent internal string combiners, each associated with one of the two MPPT inputs. The combiners utilize standard 10 mm x 38 mm PV combiner fuses and associated fuse holders. Because of the TL design, all strings are floating with respect to ground, and two fuses are required per string input connected in series with the positive and negative string leads. Any 10mm x 38mm Listed PV fuse can be utilized for replacement purposes. The specifications of the required fuse and the fuse brand utilized at the factory are listed below.

5.3 Replace Internal String Fuse

Rated current

Rated voltage

Operating Class

Fuse Type

15 A

1000 V

Solar PV

10x38 ferrule

UL Listed

UL Listing Category

Typical Mfr

Mfr P/N

UL248-19/UL2579

JFGA

Littelfuse

OSPF015

CAUTION – Shock/Fire hazard

Fuse holders do not have load break capability! Before opening any combiner fuse holder in -120 or -122 models be sure both DC switches are in the OFF position

Table 5-2: Combiner Fuse Specification

Maintenance

Figure 5-7: Fuse holder locations for 120/122 models

The fuse holders are mounted on two separate PWBs (one/MPPT). The pull-out fuse holders allow safe removal of fuses which are inserted into a carrier. Figure 5-7 shows the location of the combiner fuse holders, and

Figure 5-8 provides details to remove a fuse from the 120/122 WB; refer to Figure 2-5 for additional information.

Figure 5-8: Accessing the individual fuses

Maintenance

Figure 5-9: String monitor

1 : 2 : 3 :

8.0

0.0

7.9

4 : 5 : 6 :

8.0

8.1

8.0

IDC1 (A)

1 : 2 : 3 :

8.0

8.1

7.9

4 : 5 : 6 :

8.0

0.0

8.1

IDC2 (A)

Fuse open or blown

Check the combiner fuses if the power generation of inverter is abnormal using the following procedure:

1. Check “Power meter/string monitoring” page on the LCD display, to determine if any string current measurement is zero, which will most probably indicate a blown fuse. (Figure 5-9)

2. Switch AC and DC power off and wait until LCD display turns off.

3. To access the wiring box, use procedure found in Section 5.1.1

4. Based on step 1, check the corresponding fuse locations by pulling out the fuse holder (Figure 5-8) and checking continuity of the fuse.

5. Replace the fuse if necessary.

6. Re-install the WB cover, using the procedure found in Section 5.1.2

Maintenance

Figure 5-10: Smart Fans location on Power Module chassis

M42/36/28U models are provisioned with processor-controlled "smart fans" for cooling of the electronics. This section provides procedures for cleaning filters associated with these fans, and instructions for field replacement of the fans. The fans utilized have high reliability ratings and coupled with use of processor controls provide a "smart" cooling system design with a long life. The system features tachometer detection of a failed fan, and generates a "FAN-FAIL" signal that is interfaced to the inverter control to trigger a FAN-FAIL alarm and places the inverter in a power de-rate mode as required for safe operation.

Depending upon the model, fans are installed at two locations within inverter:

• Power Module (PM) compartment (-120, -121, -122) Figures 5-10, 5-11 illustrates the fan locations.

5.4 Smart Fans Replacement and Filter Cleaning

Air Outlets / Smart Fans inside PM

Air inlet duct, 2 places

Maintenance

Waterproof connectors

Hand grip

8 cm cooling fan with filter

Hand grip

M42U M36/28U

Figure 5-11: Power Module Fan tray

Periodic fan and filter cleaning is required to insure long life and reliability.

- The time period between cleanings depends on the quality of the environment.

- Under normal duty use, Delta recommends smart fans and filters be cleaned every 6 months

- For very dusty locations, it may be necessary to clean the fans and filters quarterly or monthly.

ATTENTION

The cooling fans feature modular designs that make their removal for cleaning or replacement a simple task. As a result, the replacement of fans is also smart.

Maintenance

Refer to Figure 5-12 and follow the steps outlined below:

1. Remove the outlet filter assemblies on the left and right side of the PM by removing four screws on each. If filter maintenance is the goal, the two filter elements can be cleaned at this time and reassembled.

2. On the right side, unplug the fan power wiring from their terminals.

3. On the right side, loosen the four knurled screws and remove the two screw assemblies.

Grasp the handle at the top of the fan tray and pull straight out from PM chassis.

To reassemble reverse the order of the above procedure and tighten screws to torque values indicated in Figure 5-12.

5.4.1.1 PM Fan Tray removal procedure

The inverter electronics are convection cooled. The primary equipment used for this function consists of a fan tray located in a plenum within the inverter power module. The PM electronics are isolated, and heat is transferred to the plenum airflow via a large heatsink. The PM fan tray is modular and holds four smart fans that that operate together and also provide redundancy; the inverter will operate to full power with two fans operating and will enter a power derating mode under failure of a second fan. These fans are protected by air filters at the plenum air inlet and outlet.

5.4.1 Power Module (PM) Fan Tray

Maintenance

Figure 5-12: Disassembling fan tray from PM chassis (showing one side only)

①

②

③

* Screw torque required for assembling:

7 lbf-in (0.8N.m)

* Screw torque required for assembling: 7 lbf-in (0.8N.m)

Maintenance

* Screw torque required for assembling: 7 lbf-in (0.8N.m)

Figure 5-13: Removing the PM air inlet filter

Refer to Figure 5-13. Filter can be removed from either side of PM:

1. Unlatch the retaining hook and grasp the filter handle.

2. Carefully pull the filter frame straight out keeping it perpendicular to the side of the PM chassis.

3. Clean the filter with warm water and allow to dry.

Reverse the above procedure to re-install the filter. When filter assembly is in proper position, the retaining hook should be latched to the rail.

5.4.1.2 Procedures to remove PM air inlet filter

Maintenance

5.5 De-Commissioning

DANGER : ELECTRICAL HARZARD!!

To avoid serious injury, use follow the procedure

- Switch off internal AC switch and then both DC switches to cease inverter operation

- Switch off external AC circuit breaker or switch to disconnect the electrical grid from the inverter chassis

- Remove array DC from chassis requires opening string level MC4 connectors in order

to break string continuity at the inverter MC4 connectors are not intended for use as a load break switch, therefore: Ensure inverter DC switches are open and there is no DC current flow

■ For -122 model –  Use MC4 tool to open and disconnect each string from the chassis mounted MC4  terminals at the inverter

■ For -120 model –  1. Within the connected array, open an MC4 connector within each string connected

to the inverter; repeat for strings connected to each MPPT input

 2. Open WB by removing WB cover  3. For each MPPT channel,

• Use a voltmeter to check for zero voltage at the combiner output

• If any hazardous voltage level is detected, use voltmeter at the combiner input (fuse holders) to measure voltage across each string.

• For any strings showing hazardous voltage, open external MC4 connectors in those strings.

• Repeat measurements to insure there is no continuity in any connected string

• Loosen fuse holder screws to free string wiring and remove from wiring box

■ For -121 model –  1. For each MPPT channel

• Locate and open DC disconnect switch located at or within the associated array combiner;

- if no switch is provisioned, open continuity of each string as described for -120 model, above

• Open inverter WB, and measure voltage across each MPPT input terminal pair

• Confirm there is no hazardous DC voltage at either input

 2. Loosen fuse holder screws to free string wiring and remove from wiring box

■ RS-485 Communication module – all models  1. Remove communications module from inverter  2. Disconnect all communications wiring from the module terminals  3. Remove wiring from communications board assembly  4. Re-install communications board assembly in inverter

When necessary to remove the inverter from active operation for maintenance or replacement, follow the instructions below.

Maintenance

- Use care not to touch hot surfaces if the inverter is just shutting down.

- Do not perform any task until the product cool down sufficiently.

CAUTION: HOT SURFACES, DO NOT TOUCH !

The inverter weighs more than 84 kg (185 lb).

There is risk of injury if the inverter is carried incorrectly or dropped during transport or when attaching or removing it from the wall mounting bracket. Personnel should wear suitable gloves to protect against injury and maintain firm control of the inverter chassis

CAUTION: POSSIBILE INJURY !

Use care when handling mounting hardware Do not leave loose screws and nuts inside the wiring box compartment.

ATTENTION

Maintenance

Table 6-1A: Error Codes and Messages

Message Possible cause Action

AC Freq

High

(E01)

1. Actual utility frequency is over the OFR setting

2. Incorrect Grid code setting

3. Detection circuit malfunction

1. Check the utility frequency

2. Check Grid code setting

3. Contact customer service for

technical support

AC Freq

Low

(E02)

1. Actual utility frequency is under the UFR setting

Incorrect Grid code or Grid setting

3. Detection circuit malfunction

1. Check the utility frequency

2. Check Grid code & Grid setting

3. Contact customer service for

technical support

Grid Quality

(E07)

Non-linear load in Grid and near to inverter

Grid connection of inverter need to be far away from non-linear load if necessary

1. Wrong connection in AC terminal

2. Detection circuit malfunction

1. Check the AC connection in accordance with the user manual

2. Contact customer service for

technical support

No Grid

(E09)

1. AC breaker is OFF

2. Disconnect in AC terminal

1. Switch on AC breaker

2. Check the connection in AC terminal and make sure it connects to inverter

AC Volt

Low

(E10, E15,

E20)

1. Actual utility voltage is under the UVR setting

Incorrect Grid code or Grid setting

Wrong connections in AC terminal

4. Detection circuit malfunction

Check the utility voltage within the suitable

range

2. Check Grid code & Grid setting

3. Check the connection in AC terminal

4. Contact customer service for

technical support

AC Volt

High

(E11, E13,

E16, E18, E21, E23)

1. Actual utility voltage is over the OVR setting

2. Utility voltage is over the Slow OVR setting during operation

3. Incorrect Grid code or Grid setting

4. Detection circuit malfunction

5. Wrong connection in AC terminal

Check the utility voltage within the suitable

range

2. Check Grid code & Grid setting

3. Check the connection in AC terminal

4. Contact customer service for

technical support

Solar1

High

(E30)

1. MPPT 1 input voltage is over 1000Vdc

2. Detection circuit malfunction

1. Modify the solar array setting, and make the Voc less than 1000Vdc

2. Contact customer service for

technical support

6　Error message and Trouble Shooting

While Delta Electronics endeavors to build electronic products to very high standards of reliability, there will arise instances where the inverter may not operate properly. When such a condition is encountered, please follow the instructions in the Troubleshooting Guide (Tables 6-1, 6-2, and 6-3) to attempt to clear the fault. If fault continues to appear or if it is listed more than once in the inverter Error log, it may be necessary to call Delta Technical Service Hot Line. A service call checklist with necessary information for a call to the hotline is provided at the end of the Troubleshooting guide.

Delta Technical Hotline can be reached at 1-877-440-5851 or 1-626-369-8021

6.1 Error Codes

AC Con. Fail

(E08)

Error message and Trouble Shooting

Table 6-1B: Error Codes and Messages

Message Possible cause Action

Solar2

High

(E31)

1. MPPT 2 input voltage is over 1000Vdc

2. Detection circuit malfunction

1. Modify the solar array setting, and make the Voc less than 1000Vdc

2. Contact customer service for

technical support

Insulation

(E34)

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. Contact customer service for

technical support

Table 6-2A: Warning Codes and Messages

Message Possible cause Action

Solar1

Low

(W01)

Solar2

Low

(W02)

AC Surge

DC Surge

1. Inverter was struck by lightning

2. One or more SPD are defective

3. One or more SPD are disconnected

4. Detection circuit malfunction

5. Wrong connection in AC terminal

1. Check inverter’s status

2. Replace the defective SPD

3. Check the connections of SPDs

4. Check the connection in AC terminal

5. Contact customer service for

technical support

Ext Fan Fail

Int Fan Fail

(W11)

1. One or more fans are locked

One or more fans are defective

3. One ore more fans are disconnected

4. 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. Contact customer service for

technical support

Ext Fan Fail

Int Fan Fail

Contact customer service for technical support

1. MPPT 1 input voltage is under the limit

2. Some devices were damaged inside the inverter if the actual MPPT 1 voltage is close to "0"

3. Detection circuit malfunction

1. Check the MPPT 1 voltage connection to the inverter terminal

2. Check all switching devices in boost1

3. Contact customer service for

technical support

1. MPPT2 input voltage is under the limit

2. Some devices were damaged inside the inverter if the actual MPPT 2 voltage is close to "0"

3. Detection circuit malfunction

1. Check the MPPT 2 input voltage connection at the inverter terminal

2. Check all switching devices in boost2

3. Contact customer service for

technical support

6.2 Warning Codes

Error message and Trouble Shooting

Table 6-3A: Fault Codes & Messages

Message Possible cause Action

Injection

(F01, F02,

F03)

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. Contact customer service for

technical support

Temperature

(F05)

1. The ambient air is over 60℃ (The installation is abnormal)

2. Detection circuit malfunction

1. Check the installation ambient and environment

2. Contact customer service for

technical support

Temperature

(F07)

1. Ambient air is less than -30℃

2. Detection circuit malfunction

1. Check the installation ambient and environment

2. Contact customer service for

technical support

HW NTC1

Fail

(F06)

1. Ambient temperature >90 ℃ or <-30 ℃

2. Detection circuit malfunction

1. Check the installation ambient and environment

2. Contact customer service for

technical support

HW NTC2

Fail

(F08)

1. Ambient temperature >90 ℃ or <-30 ℃

2. Detection circuit malfunction

1. Check the installation ambient and environment

2. Contact customer service for

technical support

HW NTC3

Fail

(F09)

1. Ambient temperature >90 ℃ or <-30 ℃

2. Detection circuit malfunction

1. Check the installation ambient and environment

2. Contact customer service for

technical support

HW NTC4

Fail

(F10)

1. Ambient temperature >90 ℃ or <-30 ℃

2. Detection circuit malfunction

1. Check the installation ambient and environment

2. Contact customer service for

technical support

HW RLY

(F13)

1. Driver circuit for relay is defective

2. Relay(s) is defective

3. Detection circuit malfunction (Inverter voltage)

1. Check the input voltage, must >150Vdc

2. Replace the defective relay

3. Contact customer service for

technical support

HW DSP

ADC1

(F15)

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. Contact customer service for

technical support

6.3 Fault Codes

Error message and Trouble Shooting

Table 6-3B: Fault Codes & Messages

Message Possible cause Action

HW DSP

ADC2

(F16)

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. Contact customer service for

technical support

HW DSP

ADC3

(F17)

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. Contact customer service for

technical support

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. Contact customer service for

technical support

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. Contact customer service for

technical support

HW Red

ADC1

(F18)

HW Red

ADC2

(F19)

HW Eff.

(F20)

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

COMM1

(F23)

1. DSP is idling

2. The communication connection is disconnected

3. The communication circuit is malfunction

1. Contact customer service for

technical support

2. Check the connection interface RS-485

3. Check the communication card

COMM2

(F22)

1. Red. CPU is idling

2. The internal communication connection is disconnected

Contact customer service for technical support

Ground Cur.

(F24)

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 external transformer if necessary

3. Contact customer service for

technical support

Error message and Trouble Shooting

Table 6-3C: Fault Codes & Messages

Message Possible cause Action

HW Con. Fail

(F26)

1. Power line is disconnected inside the inverter

2. Current feedback circuit is defective

1. Check the power lines inside the inverter

2. Contact customer service for

technical support

RCMU Fail

(F27)

1. RCMU is disconnected

2. Detection circuit malfunction

1. Check the RCMU connection inside the inverter

2. Contact customer service for

technical support

1. One or more relays are sticking

2. The driver circuit for the relay malfunction

3. Wrong connection in AC terminal

1. Check the connection in AC terminal

2. Contact customer service for

technical support

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

Contact customer service for technical support

RLY Short

(F28)

RLY Open

(F29)

Bus Unbal.

(F30)

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. Contact customer service for

technical support

HW Bus OVR

(F31, F33, F35)

1. Driver for boost is defective

2. Voc of PV array is over

1000Vdc

3. Surge occurs during

operation

4. Detection circuit malfunction

Contact customer service for technical support

AC Cur. High

(F36, F37, F38,

F39, F40, F41)

1. Surge occurs during

operation

2. Driver for inverter stage is

defective

3. Switching device is defective

4. Detection circuit malfunction

Contact customer service for technical support

HW CT A Fail

(F42)

1. Test current loop is broken

2. CTP3 is defective

3. Detection circuit malfunction

Error message and Trouble Shooting

Table 6-3D: Fault Codes & Messages

Message Possible cause Action

HW CT B Fail

(F43)

1. Test current loop is broken

2. CTP4 is defective

3. Detection circuit malfunction

HW CT C Fail

(F44)

1. Test current loop is broken

2. CTP5 is defective

3. Detection circuit malfunction

1. Large Grid harmonics

2. Switching device is defective

3. Detection circuit malfunction

1. Check the utility waveform. Grid connection of inverter needs to be far away from non-linear load if necessary

2. Check all switching devices in inverter stage

3. Contact our customer service for

technical support

1. AFCI is not installed.

2. AFCI self-test is fail.

Check the AFCI detection circuit board to insure proper connections

Contact customer service for technical support

HW AC OCR

(F45)

AFCI Circuit

Fail

(F58)

One or more DC relays are abnormal

Contact customer service for technical support

HW DC RLY

(F76)

The inverter detects Arcing occurs.

Check PV array cables for replacement

AFCI Fault

(F59)

DC Cur. High

(F60, F61,

F70, F71)

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

Contact customer service for technical support

Error message and Trouble Shooting

In order for Delta Hotline personnel to efficiently handle your service request, certain information must be made availble to the service technician. Prior to calling the Delta Service Hotline, the information listed below must be assembled:

6.4.1 Service Call Checklist

6.4 Calling for Help

1. Installation Information a. Location of the install b. How many inverters c. Date of Commissioning (if known)

2. Check the Product Label or use LCD display to view and record: a. Model number b. Serial number c. Production date

3. State of the LCD: a. Is the display active (powered)? b. What is the state of the inverter? c. What is the error message or code? d. Can the Error Log be accessed? i.

If, so, please list code number, date and time for any log entry in 24 hr period prior

to appearance of error code on LCD screen

4. Status of LED warning lights. a. What LED color(s) are lighted, if any? b. Are the LEDs flashing on and off, or lighted continuously?

5. System configuration: a. What is brand and model of photovoltaic modules? b. What is number of PV modules per string c. Number of strings in each array d. What is maximum array voltage and current values

6. System condition: a. Can the fault or error be reproduced? If so, how? b. Is the fault cyclical in nature? If so, how often? c. Was the fault apparent at the time of installation? If so, has it worsened? d.

Describe the atmospheric conditions at the time the fault/error appears or appeared.

Delta Technical Hotline can be reached at 1-877-440-5851 or 1-626-369-8021.

Error message and Trouble Shooting

7　Technical Data

7.1 Technical of M42U series

Maximum input voltage Operating voltage range

Start voltage

MPP range for POUT-RATED

Connection type

Combiner fuses

Surge protection, DC side

DC disconnect switch

Number of MPP trackers

Current limit, I

MP-MAX /MPPT

M42U

_120 M42U_121 M42U_122

1100V* (1000V MAX for NEC)

200 - 1000 V

>250 V

545 - 830 V

40A/MPPT

Allowable array ISC-MAX /MPPT

100A/MPPT

String current monitor

Allowable conductors

Rated voltage 710 V

Rated output power

Max. output power

Allowable grid configuration

Line frequency range

THD

Connection type

Surge protection, AC side

Night time consumption

42kW

46kW

Rated line voltage

3Ø-4W-Yg or 3Ø-3W

4W: 480/277±10% ; 3W: 480V±10%

Max. output current 56.2A

Efficiency

Peak efficiency

CEC efficiency

98.6 %

98.0 %

50/60Hz

<3%

<3W

Power factor Unity at P

RATED; adjustable: [0.8 ind ~0.8 cap]

AC Switch & Terminal block #4~#6 AWG

Euro efficiency 98.4 %

SPD Type II 10kA (8 x20us)

Dimensions (W x H x D) [in]

* The max withstand voltage is 1100Vdc. (inverter ceases operation if input exceeds 1000Vdc)

W/O Wiring box

Weight

[lb]

Shipping weight

24.2 x 32.2 x 10.8 24.2 x 34 x 10.8

W/ Wiring box 132.9 127.6 132.5

150.9 145.6 150.5

99.2

12 pr. Fuse holders 2pr. Terminal blocks 12 pr. MC4 connectors

#10~#12 AWG, Cu only

#2~#8 AWG, Cu/Al

SPD Type II 10kA (8 x20us)

#10~#12 AWG, Cu only

24 x 15A Not Provisioned 24 x 15A

Yes Yes Yes

Yes Not Provisioned Yes

DC Input

AC Output

General Data

Technical Data

7.2 Technical of M36U series

Maximum input voltage Operating voltage range

Start voltage

MPP range for POUT-RATED

Connection type

Combiner fuses

Surge protection, DC side

DC disconnect switch

Number of MPP trackers

Current limit, I

MP-MAX /MPPT

M36U

_120 M36U_121 M36U_122

1100V* (1000V MAX for NEC)

200 - 1000 V

>250 V

520 - 830 V

36A/MPPT

Allowable array ISC-MAX /MPPT

100A/MPPT

String current monitor

Allowable conductors

Rated voltage 710 V

Rated output power

Max. output power

Allowable grid configuration

Line frequency range

THD

Connection type

Surge protection, AC side

Night time consumption

36kW

39.6kW

Rated line voltage

3Ø-4W-Yg or 3Ø-3W

4W: 480/277±10% ; 3W: 480V±10%

Max. output current 48.2A

Efficiency

Peak efficiency

CEC efficiency

98.6 %

98.0 %

50/60Hz

<3%

<3W

Power factor Unity at P

RATED; adjustable: [0.8 ind ~0.8 cap]

AC Switch & Terminal block #4~#6 AWG

Euro efficiency 98.4 %

SPD Type II 10kA (8 x20us)

Dimensions (W x H x D) [in]

* The max withstand voltage is 1100Vdc. (inverter ceases operation if input exceeds 1000Vdc)

W/O Wiring box

Weight

[lb]

Shipping weight

24.2 x 32.2 x 10.8 24.2 x 34 x 10.8

W/ Wiring box 129 123.7 128.5

147 141.7 146.5

99.2

10 pr. Fuse holders 2pr. Terminal blocks 10 pr. MC4 connectors

#10~#12 AWG, Cu only

#2~#8 AWG, Cu/Al

SPD Type II 10kA (8 x20us)

#10~#12 AWG, Cu only

20 x 15A Not Provisioned 20 x 15A

Yes Yes Yes

Yes Not Provisioned Yes

DC Input

AC Output

General Data

Technical Data

7.3 Technical of M28U series

Maximum input voltage Operating voltage range

Start voltage

MPP range for POUT-RATED

Connection type

Combiner fuses

Surge protection, DC side

DC disconnect switch

Number of MPP trackers

Current limit, I

MP-MAX /MPPT

M28U

_120 M28U_121 M28U_122

1100V* (1000V MAX for NEC)

200 - 1000 V

>250 V

485 - 830 V

30A/MPPT

Allowable array ISC-MAX /MPPT

50A/MPPT

String current monitor

Allowable conductors

Rated voltage 710 V

Rated output power

Max. output power

Allowable grid configuration

Line frequency range

THD

Connection type

Surge protection, AC side

Night time consumption

28kW

30.8kW

Rated line voltage

3Ø-4W-Yg or 3Ø-3W

4W: 480/277±10% ; 3W: 480V±10%

Max. output current 37.5A

Efficiency

Peak efficiency

CEC efficiency

98.6 %

98.0 %

50/60Hz

<3%

<3W

Power factor Unity at P

RATED; adjustable: [0.8 ind ~0.8 cap]

AC Switch & Terminal block #4~#6 AWG

Euro efficiency 98.4 %

SPD Type II 10kA (8 x20us)

Dimensions (W x H x D) [in]

* The max withstand voltage is 1100Vdc. (inverter ceases operation if input exceeds 1000Vdc)

W/O Wiring box

Weight

[lb]

Shipping weight

24.2 x 32.2 x 10.8 24.2 x 34 x 10.8

W/ Wiring box 122.6 117.3 122.1

140.6 135.3 140.1

99.2

8 pr. Fuse holders 2pr. Terminal blocks 8 pr. MC4 connectors

#10~#12 AWG, Cu only

#2~#8 AWG, Cu/Al

SPD Type II 10kA (8 x20us)

#10~#12 AWG, Cu only

16 x 15A Not Provisioned 16 x 15A

Yes Yes Yes

Yes Not Provisioned Yes

DC Input

AC Output

General Data

Technical Data

7.5 Certifications

7.4 Communications

Operating TAMB range

Operating elevation

Environment protection

Cooling method

-13°~140°F (-25°~60°C)

Comm port | Protocol

Display

RS-485 | Delta or Sunspec

20 x4 line LCD

Safety

Interconnection

UL1741 SA UL1741, UL1998, UL1699B, CSA C22.2, FCC Pt.15 (Class B)

IEEE1547, IEEE 1547.1

<9800 ft (3000m)

NEMA 4X

Forced air cooling with Smart Fan controls

General Data

7.7 General Data

Communications

Certifications

7.6 Smart Inverter Functionality

Smart Inverter Designations

Adjustable Controls

Utility Support Grid Interactive Inverter (UL1741 SA)

CEC Approved CA Rule 21 compatible

V, F Ride-through, PF adjust, Ramp rate control

Autonomous Functions

Volt/VAR, Volt/Watt, Active power curtailment

Smart Inverter Functionality

Technical Data

Figure 7-1: Thermal Derating curve of M42U

40 45 50

50 %

55 %

60 %

65 %

70 %

75 %

80 %

85 %

90 %

95 %

100 %

105 %

110 %

115 %

P/P*

P*=42kW

545V 710V 830V

Temperature Derating of M42U

Technical Data

Figure 7-2: Thermal Derating curve of M36U

40 45 50

50 %

55 %

60 %

65 %

70 %

75 %

80 %

85 %

90 %

95 %

100 %

105 %

110 %

115 %

P/P*

P*=36kW

520V 710V 830V

Temperature Derating of M36U

Technical Data

Figure 7-3: Thermal Derating curve of M28U

40 45 50

50 %

55 %

60 %

65 %

70 %

75 %

80 %

85 %

90 %

95 %

100 %

105 %

110 %

115 %

P/P*

P*=28kW

485V 710V 830V

Temperature Derating of M28U

Technical Data

Region

High Voltage 2 (HV2)

High Voltage 1 (HV1)

Near Nominal (NN)

Low Voltage 1 (LV1)

Low Voltage 2 (LV2)

Low Voltage 3 (LV3)

While these operating parameters correspond to the Rule 21 parameters, they may be substituted with operating parameters for other area EPS requirements. Note 1: Manufacturer may evaluate product over wider ranges of adjustment than those within the table. Note 2: The table voltage could be either at the PCC or equipment terminals. Note 3: For LV3 or HV1 the EUT shall cease to energize in not more than 0.16s (and not trip). This may differ in other SRD(s).

Appendix A-1: Low and High Voltage Ride-Through Set-points and Timing per Table SA9.1

Default operating parameters that correspond to Rule 21 L/HVRT

Appendix A-2: Low and High Frequency Ride-Through Set-points and Timing per Table SA10.1

Default operating parameters that correspond to Rule 21 L/HFRT

V ≥ 120

110 < V < 120

88 ≤ V ≤ 110

70 ≤ V < 88

50 ≤ V < 70

V < 50

Not Applicable

12s

Indefinite

20s

10s

Not Applicable

Momentary Cessation

Continuous Operation

Mandatory Operation

Momentary Cessation

0.16s

13s

Not Applicable

21s

11s

1.5s

Voltage

(% Nominal Voltage)

Ride-Through Until Operating Mode

Maximum Trip Time

(s)

APPENDIX: Grid Support Utility Interactive Inverters

Appendix A: CA Rule 21

The inverter has pre-programmed control presets intended for use in specific geographic areas. They include:

• Rule 21 – Preset all required controls to meet the F/VRT specifications that satisfy CA Power Tariff Rule 21

• HECO A – Presets all required controls to meet the for the Hawaiian Islands of O’ahu, Hawai’i Island, and Maui

• HECO B – Presets all required controls to meet the F/VRT specifications for the Hawaiian Islands of Moloka’i and Lana’i The following sections provide details of the settings and its adjustable range.

Region

High Frequency 2 (HF2)

High Frequency 1 (HF1)

Near Nominal (NN)

Low Frequency 1 (LF1)

Low Frequency 2 (LF2)

While these operating parameters correspond to the Rule 21, 2015 parameters, they may be substituted with operating parameters for other area EPS requirements. Note 1: Manufacturer may evaluate product over wider ranges of adjustment than those within the table. Note 2: Frequency / Watt functionality is an option under the Rule 21, 2015 filing.

f > 62

60.5 < f ≤ 62

58.5 < f ≤ 60.5

57.0 < f ≤ 58.5

f ≤ 57.0

62.0 - 64.0

60.1 - 62.0

Not Applicable

57.0 - 59.9

53.0 - 57.0

Not Applicable

Momentary Cessation

Continuous Operation

Not Applicable

System Frequency

Default Settings

Minimum Range of

Adjustability (Hz)

Ride-Through

Until (s)

Ride-Through

Operational Mode

0.16

300

Not Applicable

300

0.16

Trip Time (s)

Mandatory Operation

Mandatory

Operation

Continuous

Operation

Mandatory

Operation

Not Applicable

100

Appendix A: Rule 21

Delta Electronics M42U, M36U, M28U, M80U, M60U Operation And Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual