Delta Electronics M42U, M36U, M28U, M80U, M60U Operation And Installation Manual
M42U
M36U
M28U
Operation and Installation Manual
Grid-tie Transformerless Solar Inverter
The power behind competitiveness
www.deltaww.com
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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
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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
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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
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8
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
15
18
22
46
47
48
52
52
54
58
61
72
76
86
87
87
88
89
90
91
100
100
101
101
101
102
102
103
104
104
104
107
108
109
110
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9
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
10
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
MPPtracking 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.
11
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
12
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.
13
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
14
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
9
Screw
Ground bar mounting screws (122 Models)
(Stainless/M5/21mm)
5 pcs
10
Screw
To secure inverter to mounting bracket
(Stainless/M6/12mm)
Object Qty Description
1 Delta Solar Inverter 1 pc
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)
7
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
15
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
16
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
17
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
18
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
19
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
20
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
21
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
12
NO. Component
Type II DC SPD
Internal AC terminal
13
17
Communication port
Grounding (M6 threaded stud)
18 External ground bar location
1
2
Fuse holder type DC IN1
9
Internal DC terminal
14
3
Fuse holder type DC IN2
10
15
4
DC switch
11
16
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
⑩
⑫
⑬ ⑭
①
①
④
⑪
⑪
②
②
③ ③
⑰
⑫
③⑤
⑥ ⑦
④
④
⑬ ⑭
⑰
⑩
⑱
⑯
⑮⑯⑮
⑫
⑬ ⑭
①
⑪
IN 1IN 1 IN 2IN 2
IN 1IN 1 IN 2IN 2
⑨⑧
⑥
⑤
⑥
⑤
⑩
⑨
⑨
⑧ ⑩
⑨
⑯
⑯
⑯
22
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.
5.
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.
23
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 !
1.
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.
24
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
25
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
26
Installation
Figure 3-5: Prohibited mounting positions
O: Permitted / X: Prohibited
Figure 3-4: Permitted mounting positions
90
NAME PLATE COVER SHIELD
or
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.
27
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.
28
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
#2
Inverter
#1
> 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]
> 80cm
[31.5in]
29
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
30
Installation
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