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CA
US
Installation Manual
SMA CONNECTION UNIT 1000-US
CU1000-US-11-IA-en-13 | Version 1.3
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SMA Solar Technology America LLC Legal Provisions
Legal Provisions
Copyright © 2017 SMA Solar Technology America LLC. All rights reserved.
No part of this document may be reproduced, stored in a retrieval system, or transmitted, in any form
or by any means, be it electronic, mechanical, photographic, magnetic or otherwise, without the prior
written permission of SMA Solar Technology America LLC.
Neither SMA Solar Technology America LLC nor SMA Solar Technology Canada Inc. makes
representations, express or implied, with respect to this documentation or any of the equipment and/
or software it may describe, including (with no limitation) any implied warranties of utility,
merchantability, or fitness for any particular purpose. All such warranties are expressly disclaimed.
Ne ith er S MA S ola r Te chn olo gy A merica LL C no r it s di str ibu tor s or dealers nor SMA Solar Technology
Canada Inc. nor its distributors or dealers shall be liable for any indirect, incidental, or consequential
damages under any circumstances.
(The exclusion of implied warranties may not apply in all cases under some statutes, and thus the
above exclusion may not apply.)
Specifications are subject to change without notice. Every attempt has been made to make this
document complete, accurate and up-to-date. Readers are cautioned, however, that product
improvements and field usage experience may cause SMA Solar Technology America LLC and/or
SMA Solar Technology Canada Inc. to make changes to these specifications without advance notice,
or per contract provisions in those cases where a supply agreement requires advance notice. SMA
shall not be responsible for any damages, including indirect, incidental or consequential damages,
caused by reliance on the material presented, including, but not limited to, omissions, typographical
errors, arithmetical errors or listing errors in the content material.
Trademarks
All trademarks are recognized, even if not explicitly identified as such. Missing designations do not
mean that a product or brand is not a registered trademark.
®
Modbus
Organization, Inc.
QR Code is a registered trademark of DENSO WAVE INCORPORATED.
Phillips
Torx
is a registered trademark of Schneider Electric and is licensed by the Modbus
®
and Pozidriv® are registered trademarks of Phillips Screw Company.
®
is a registered trademark of Acument Global Technologies, Inc.
SMA Solar Technology America LLC
6020 West Oaks Blvd.
Suite 300 Rocklin, CA 95765 U.S.A.
SMA Solar Technology Canada Inc.
2425 Matheson Blvd. E
7th Floor
Mississauga, ON L4W 5K4
Canada
Installation Manual CU1000-US-11-IA-en-13 3
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Important Safety Instructions SMA Solar Technology America LLC
Important Safety Instructions
SAVE THESE INSTRUCTIONS
This manual contains important instructions for the following products:
• CU 1000-US-11 (SMA Connection Unit 1000-US)
This manual must be followed when using this product.
The product is designed and tested in accordance with international safety requirements, but as with
all electrical and electronic equipment, certain precautions must be observed when installing and/or
operating the product. To reduce the risk of personal injury and to ensure the safe installation and
operation of the product, you must carefully read and follow all instructions, cautions and warnings
in this manual.
Warnings in this Document
A warning describes a hazard to equipment or personnel. It calls attention to a procedure or practice,
which, if not correctly performed or adhered to, could result in damage to or destruction of part or all
of the SMA equipment and/or other equipment connected to the SMA equipment or personal injury.
Symbol Description
DANGER indicates a hazardous situation which, if not avoided, will result in
death or serious injury.
WARNING indicates a hazardous situation which, if not avoided, could result
in death or serious injury.
CAUTION indicates a hazardous situation which, if not avoided, could result
in minor or moderate injury.
NOTICE is used to address practices not related to personal injury.
Warnings on this product
The following symbols are used as product markings with the following meanings.
Symbol Description
Warning regarding dangerous voltage
The product works with high voltages. All work on the product must only
be performed as described in the documentation of the product.
Beware of hot surface
The product can become hot during operation. Do not touch the product
during operation.
Observe the operating instructions
Read the documentation of the product before working on it. Follow all
safety precautions and instructions as described in the documentation.
4 CU1000-US-11-IA-en-13 Installation Manual
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SMA Solar Technology America LLC General Warnings
General Warnings
All electrical installations must be carried out in accordance with the local electrical standards and
the National Electrical Code® ANSI/NFPA 70 or the Canadian Electrical Code® CSA C22.1.
This document does not replace and is not intended to replace any local, state, provincial, federal
or national laws, regulations or codes applicable to the installation and use of t he p rod uct , in clu din g
without limitation applicable electrical safety codes. All installations must conform with the laws,
regulations, codes and standards applicable in the jurisdiction of installation. SMA assumes no
responsibility for the compliance or non-compliance with such laws or codes in connection with the
installation of the product.
The product contains no user-serviceable parts.
Before installing or using the product, read all of the instructions, cautions, and warnings in this
manual.
Before connecting the product to the electrical utility grid, contact the local utility company.
This connection must be made only by qualified personnel.
Wiring of the product must be made by qualified personnel only.
Installation Manual CU1000-US-11-IA-en-13 5
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General Warnings SMA Solar Technology America LLC
6 CU1000-US-11-IA-en-13 Installation Manual
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SMA Solar Technology America LLC Table of Contents
Table of Contents
1 Information on this Document. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1 Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Skills of Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 Scope of Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Connection Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Type Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 DC Switch-Disconnector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4 Integration Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.5 String Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Requirements for Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 Mounting the Connection Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1 Safety during Electrical Connection. . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2 Overview of the Connection Area. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2.1 Enclosure Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2.2 Interior View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.3 Connecting Conduits to the Connection Unit. . . . . . . . . . . . . . . . . . . 28
6.4 Connecting the Grounding Conductor . . . . . . . . . . . . . . . . . . . . . . . 29
6.5 Connecting the PV Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.6 Connecting the Output Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.1 Inserting the String Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.2 Commissioning the Connection Unit . . . . . . . . . . . . . . . . . . . . . . . . . 36
8 Disconnecting the Connection Unit from Voltage Sources . . . 37
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Table of Contents SMA Solar Technology America LLC
9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9.1 Replacing the String Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.1 Disassembling the Connection Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.2 Packing the Connection Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.3 Disposing of the Connection Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
11 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
12 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8 CU1000-US-11-IA-en-13 Installation Manual
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SMA Solar Technology America LLC 1 Information on this Document
1 Information on this Document
Validity
This document is valid for the following device types:
• CU 1000-US-11 (SMA Connection Unit 1000-US)
Target Group
This document is intended for qualified persons. Only qualified personnel with the appropriate skills
are allowed to perform the tasks described in this document (see Section 2.2 "Skills of Qualified
Persons", page 11).
Additional Information
Links to additional information can be found at www.SMA-Solar.com:
Document title Document type
Sunny Tripower 12000TL-US / 15000TL-US / 20000TL-US /
24000TL-US / 30000TL-US
Symbols
Symbol Explanation
Information that is important for a specific topic or goal, but is not
safety-relevant
☐ Indicates an essential requirement for achieving a specific goal
☑ Desired result
✖ A problem that could occur
Installation manual
Nomenclature
Complete designation Designation in this document
SMA Solar Technology America LLC SMA
SMA Solar Technology Canada Inc. SMA
SMA Connection Unit 1000-US Connection Unit, product
Installation Manual CU1000-US-11-IA-en-13 9
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2 Safety SMA Solar Technology America LLC
A
B
C
DE
2 Safety
2.1 Intended Use
The Connection Unit is a String-Combiner to which up to eight strings can be connected.
Figure 1: Example design of a PV system with Connection Unit
Item Description
APV modules
B Connection Unit
C Sunny Tripower
D Circuit breaker
E Utility grid
The Connection Unit is suitable for indoor and outdoor use.
The Connection Unit must only be used in ungrounded PV systems. Do not use grounded PV modules
with the Connection Unit. Only ground the mounting frame of the PV modules.
All DC inputs of an ungrounded PV system must be equipped with an overcurrent protection
according to the National Electrical Code
requirements contained in Section 690.35 of the National Electrical Code
The Connection Unit is intended for use with the following transformerless SMA inverters:
• STP 12000TL-US-10 / 15000TL-US-10 / 20000TL-US-10 / 24000TL-US-10 / 30000TL-US-10
The installer is responsible for determining the appropriateness and safety of any modifications to the
product or any installed components that are not explicitly recommended for this product or
distributed by SMA.
Use this product only in accordance with the enclosed documentation and with the local standards
and directives. Any other use can result in personal injury or property damage.
• Do not mount the product in areas where flammable gases may occur.
• Do not mount the product in areas where highly flammable materials are stored.
• Do not install the product in potentially explosive atmospheres.
The enclosed documentation is an integral part of this product.
• Read and observe the documentation.
• Keep the documentation in a convenient place for future reference.
®
NEC 690. The Connection Unit shall be installed per the
®
, ANSI/NFPA 70.
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SMA Solar Technology America LLC 2 Safety
2.2 Skills of Qualified Persons
The tasks described in this document must be performed by qualified persons only. Qualified persons
must have the following skills:
• Knowledge of how electrical devices and plants work and are operated
• Training in how to deal with the dangers and risks associated with installing and using electrical
devices and plants
• Training in the installation and commissioning of electrical devices and plants
• Knowledge of all applicable standards and directives
• Knowledge of and adherence to this document and all safety precautions
Installation Manual CU1000-US-11-IA-en-13 11
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2 Safety SMA Solar Technology America LLC
2.3 Safety Precautions
This section contains safety precautions that must be observed at all times when working on or with
the product.
To pre ven t pe rsona l in jur y or pr ope rty damag e an d to ensur e lo ng-term operation of the product, read
this section carefully and follow all safety precautions at all times.
Danger to life due to high voltages in the Connection Unit
High voltages that can cause fatal electric shocks when touched are present in the live components
of the Connection Unit.
• All work on the Connection Unit must be carried out by qualified persons only.
• Before working on the Connection Unit carry out the following steps:
– Switch off all devices that are connected to the Connection Unit (e.g. inverter) and protect
against reconnection.
–Cover the PV modules.
– Turn the DC switch-disconnector of the Connection Unit counterclockwise by 90° and set
to OFF.
• While in operation, ensure all openings in the Connection Unit are sealed with appropriately
sized conduit fittings or hole covers.
• All work on the Connection Unit should only be carried out as described in this document.
Danger to life due to operating a damaged Connection Unit
Using a damaged Connection Unit can lead to serious or lethal injuries through electric shock.
• Only operate the Connection Unit when it is functioning properly and safely.
• Regularly check the Connection Unit for visible damage.
• Ensure that all safety equipment is freely accessible at all times.
Damage to the Connection Unit due to electrostatic discharges
By touching electronic components you can damage or destroy the Connection Unit through
electrostatic discharge.
• Ground yourself before touching any components.
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SMA Solar Technology America LLC 3 Scope of Delivery
CA B
3 Scope of Delivery
Check the scope of delivery for completeness and any externally visible damage. Contact your
distributor if the scope of delivery is incomplete or damaged.
Figure 2: Components included in the scope of delivery
Item Quantity Description
A1Connection Unit
B1Integration kit
C 1 Installation manual, Production Test Report
Installation Manual CU1000-US-11-IA-en-13 13
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4 Product Description SMA Solar Technology America LLC
C
o
n
n
e
c
tio
n
U
n
it
A
B
C
B
B
B
4 Product Description
4.1 Connection Unit
The Connection Unit is a String-Combiner to which up to eight strings can be connected.
Figure 3: Design of the Connection Unit
Item Description
A DC switch-disconnector
B Captive screws of the lid
CType label
In the Connection Unit the PV array strings are combined and routed into the inverter via cables.
The integrated fuse holders are designed to be used with string fuses for overcurrent protection.
The Connection Unit is equipped with a DC switch-disconnector and therefore serves as a DC
disconnection unit.
Symbols on the Connection Unit
Symbol Explanation
Equipment grounding
No galvanic isolation
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SMA Solar Technology America LLC 4 Product Description
4.2 Type Label
The type label clearly identifies the Connection Unit. The type label is located on the right-hand side
of the enclosure. You will find the following information on the type label:
• Device type (Item No.)
•Serial number (Serial No.)
• Date of manufacture,
• Device-specific characteristics
You will require the information on the type label to use the Connection Unit safely and when seeking
customer support from the SMA Service Line. The type label must be permanently attached to the
Connection Unit.
Symbols on the Type Label
Symbol Explanation
Danger to life due to high voltages
The product operates at high voltages. All work on the product must be
carried out by qualified persons only.
Risk of burns from hot surfaces
The product can get hot during operation. Avoid contact during operation.
Allow the product to cool down sufficiently before carrying out any work.
Wear personal protective equipment such as safety gloves.
Observe the documentation
Observe all documentation that is supplied with the product.
UL certification mark
UL1741 is the standard applied by Underwriters Laboratories to the
product to certify that it meets the requirements of the
National Electrical Code
®
, the Canadian Electrical Code® CSA C22.1
and IEEE-929-2000. IEEE 929-2000 provides recommendations
regarding the proper equipment and functionality necessary to ensure
compatible operation when power generation is connected to the utility
grid.
Installation Manual CU1000-US-11-IA-en-13 15
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4 Product Description SMA Solar Technology America LLC
A
B
A
E FB D
C
4.3 DC Switch-Disconnector
The Connection Unit is equipped with a DC switch-disconnector. The DC switch-disconnector enables
disconnection of the inverter from the PV array. The disconnection takes place at all poles.
Figure 4: DC switch-disconnector of the Connection Unit
Item Description
A Switch position ON
B Switch position OFF
Opening for padlock to protect against restarting
When the DC switch-disconnector is switched OFF, it can be protected against restarting with a
padlock via one of the three openings.
4.4 Integration Kit
The Integration Kit included in the scope of delivery of the Connection Unit contains components that
may be used to integrate the Connection Unit with the SMA Sunny Tripower inverter. The use of
Integration Kit components is not mandatory and it is the responsibility of the system designer and
instal ler to determine the appropriatenes s of Integration Kit components for any particular installation.
Specification and sourcing of alternative integration components is the responsibility of the system
designer and installer.
Figure 5: Integration Kit components
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SMA Solar Technology America LLC 4 Product Description
Item Quantity Description
A 2 1-inch conduit sections
Liquidtight Flexible Non-Metallic Conduit (LFNC-B)
B 4 1-inch conduit fittings
Non-metallic Liquidtight (NMLT) with locknuts
C 2 1-inch conduit fitting sealing washers
(for sealing conduit fittings at top Connection Unit openings)
D 2 1-inch liquidtight hole plugs
E5 Output conductors leads
8 AWG, Copper, 1000 VDC, PV Wire
(2) - red (pos), (2) - black (neg), (1)-green (gnd)
F16 String fuses
15 A, 1000 VDC, PV Fuses
Liquidtight Flexible Non-Metallic Conduit (LFNC-B)
The liquidtight flexible non-metallic (LFNC-B) conduits supplied in t he I ntegr ati on K it a re s uitab le
for FCC Part 15 Class A compliance for use in business/industrial/commercial environments.
If FCC Part 15 Class B compliance is required for use in a residential environment, metal
conduits (supplied by the installer) must be used.
4.5 String Fuses
St rin g fu ses are use d to pro tec t wi rin g an d equi pme nt f rom exc essive currents that can cause damage,
heating, or in extreme cases, even fire.
In PV systems, the ampacity and voltage ratings of string fuses is determined by the electrical
specifications of the PV modules and National Electrical Code® requirements. Refer to the PV module
datasheet or contact the manufacturer for technical specifications to determine required string fuse
ratings.
The maximum ampacity rating for string fuses in the Connection Unit is 20 A. The Connection Unit
Integration Kit includes 15 A string fuses. It is the responsibility of the system designer and installer to
determine the appropriateness of the supplied string fuses for any particular installation.
The minimum ampacity rating of the string fuses is calculated by means of the short-circuit current
rating (Isc) of the PV module. The National Electrical Code® stipulates that all string fuses are
designed to be at least 1.56 times as large as the Isc of the PV module being used. The correct
ampacity rating of the string fuse is determined by calculating the minimum size and then rounding it
up to the nearest standard fuse rating.
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5 Mounting SMA Solar Technology America LLC
Example: calculating the minimum size of the string fuses
For example, if the Isc of the PV module equals 8.2 A, then the size of the string fuses is determined
as follows: 1.56 x 8.2 = 12.8
The nearest standard size for string fuses would be a 15 A fuse.
5 Mounting
5.1 Requirements for Mounting
Requirements for the mounting location:
Danger to life due to fire or explosion
Despite careful construction, electrical devices can cause fires.
• Do not mount the Connection Unit in areas where flammable gases may occur.
• Do not mount the Connection Unit near highly flammable materials.
• Do not mount the Connection Unit in potentially explosive atmospheres.
Risk of burns due to hot enclosure parts
Some parts of the enclosure can get hot during operation.
• Mount the Connection Unit in such a way that it cannot be touched inadvertently.
☐ A solid building ground is required for installation, e.g. a concrete wall, brick work, a post.
☐ Studs must be present behind the mounting points on plasterboard sheets or panels.
☐ The mounting location must be suitable for the weight and dimensions of the Connection Unit
(see Section 11 "Technical Data", page 41).
☐ When mounting directly below the inverter, the minimum clearances to the inverter must be
observed (see the inverter installation manual).
☐ The mounting location should be clear and safely accessible to perform the tasks described in
this document.
☐ The ambient temperature must be within a permissible range (see Section 11 "Technical Data",
page 41). This will ensure optimal operation of the Connection Unit.
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SMA Solar Technology America LLC 5 Mounting
466 mm
(18.35 in)
20 mm
(0.79 in)
407 mm
(16 in)
398 mm
(15.67 in)
20 mm
(0.79 in)
Dimensions for mounting:
Figure 6: Dimensions of the mounting points
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5 Mounting SMA Solar Technology America LLC
407 mm
(16 in)
529 mm
(20.23 in)
Information on mounting the Connection Unit below a Sunny Tripower
• You can mount the Connection Unit directly below the Sunny Tripower. The output
openings of the Connection Unit can be aligned directly below the openings for the DC
connection of the Sunny Tripower.
• Align the oblong holes of the mounting straps of the Connection Unit, the oblong holes
of the wall mounting brackets of the Sunny Tripower, and the drill holes for the screw in
the rear panel of the Sunny Tripower to each other.
• In order to have the conduits at the Sunny Tripower and at the Connection Unit correctly
positioned, the left oblong hole of the wall mounting bracket of the Sunny Tripower and
the left oblong hole of the Connection Unit must be aligned one below the other.
Example: Mounting the Connection Unit below the Sunny Tripower; minimum
clearance measurements
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SMA Solar Technology America LLC 5 Mounting
407 mm
(16 in)
645 mm
(25.39 in)
Example: Mounting the Connection Unit below the Sunny Tripower; clearance
measurements for use with Integration Kit conduits and fittings
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5 Mounting SMA Solar Technology America LLC
300 mm
(11.8 in)
766 mm
(30 in)
Recommended clearances:
☐ Observe recommended clearances to the walls or other objects. so that the type label can be
read at all times.
☐ The clearances to the front must be chosen in such a way that the DC switch-disconnector is
accessible at all times.
Damage to the Connection Unit by mounting it in areas with a high snow accumulation
Position the Connection Unit in such way that it will not be covered entirely with snow when
mo unt ing it i n ar eas wit h a h igh pro bab ili ty o f snow dri fts . Pr olonged and repeated covering in snow
or ice can damage the seals of the conduit fittings and increases the possibility of water or moisture
intrusion into the Connection Unit.
• To protect the Connection Unit from freezing, provide sufficient clearance to the ground.
Figure 7: Recommended clearances
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SMA Solar Technology America LLC 5 Mounting
90°
max. 75°
Permitted mounting positions:
☐ The Connection Unit must be mounted in a permitted position.
Figure 8: Permitted and prohibited mounting positions
5.2 Mounting the Connection Unit
Damage to the Connection Unit due to moisture and dust intrusion
Dust or moisture intrusion can damage the Connection Unit.
• Only mount the Connection Unit with its lid closed and with all conduit openings sealed.
Additionally required mounting material (not included in the scope of delivery):
☐ At least two screws that are suitable for the foundation
☐ At least two washers that are suitable for the screws
☐ At least two screw anchors that are suitable for the foundation and for the screws
Risk of burns due to hot enclosure parts
Some parts of the enclosure can get hot during operation.
• Mount the Connection Unit in such a way that it cannot be touched inadvertently.
Risk of injury when lifting the Connection Unit, or if it is dropped
There is a risk of injury if the Connection Unit is lifted incorrectly or dropped during transport or
mounting
• Keep in mind that the Connection Unit weighs 22 lbs. (10 kg) when mounting it.
• Use suitable mounting hardware for the mounting location of the Connection Unit.
– Do not use hollow-wall anchors or toggle bolts for mounting on drywall.
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5 Mounting SMA Solar Technology America LLC
Procedure:
1. Position the Connection Unit on the mounting location.
2.
Danger of electric shock if electric cables and other supply lines are damaged by
drilling
• Before drilling, ensure that there are no electric cables and supply lines in the wall that
could be damaged.
3. Mark the drill hole positions by means of the oblong holes in the brackets of the Connection
Unit. Use at least one of the oblong holes at the top and at the bottom.
4. Remove the Connection Unit from the mounting location.
5. Drill holes at the markings.
6. Insert suitable screw anchors into the drill holes.
7. Insert screws with washers through the oblong
holes of the Connection Unit into the drill holes.
8. Tighten the screws. Ensure that no screws are loose.
9. Ensure that the Connection Unit is firmly positioned.
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SMA Solar Technology America LLC 6 Electrical Connection
6 Electrical Connection
6.1 Safety during Electrical Connection
Danger to life due to high voltages in the Connection Unit
High voltages that can cause fatal electric shocks are present in the live components of the
Connection Unit.
• All work on the Connection Unit must be carried out by qualified persons only.
• Prior to performing any work on the Connection Unit, disconnect it from any voltage source
as described in this document (see Section 8).
• All work on the Connection Unit should only be carried out as described in this document.
Damage to the seal of the enclosure lid during freezing conditions
When opening the Connection Unit during freezing conditions, the seal of the enclosure lid can be
damaged, which can lead to ingress of moisture and damage to the Connection Unit.
• Do not open the Connection Unit when the ambient temperature is below 23°F ( − 5°C).
There might be ice on the seal of the lid when there is frost or the temperatures are below
freezing. Remove it prior to opening the Connection Unit (e.g. by melting the ice with warm
air). Adhere to the corresponding safety precautions.
Damage to the Connection Unit due to moisture ingress during electrical installation
• Do not open the Connection Unit in the event of rain or a high level of humidity (> 95%).
• F or a tta chi ng t he c ond uit s to the enc los ure , on ly u se U L-l ist ed rainproof or wet location conduit
fittings in accordance with UL514B.
• Seal any unused openings using rain tight or wet location hole seals.
Electrostatic discharge
By touching electronic components you can damage or destroy the Connection Unit through
electrostatic discharge.
• Ground yourself before touching any components.
Risk of damage or failure due to improper connections
Insecure or high-resistance connections (such as improperly installed twist-on connectors) may cause
ground or arcing faults, which can lead to damage or failure and unreliable system performance.
• Select and properly install connectors which ensure secure, low-resistance connections for all
electrical connections in the PV system.
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6 Electrical Connection SMA Solar Technology America LLC
A+ A−
B− B+
A
BB
Electrical installations
All electrical installations must be made in accordance with the local electrical standards and
the National Electrical Code
®
ANSI/NFPA70 or the Canadian Electrical Code®.CSA C22.1.
• Use only +194°F (+90°C) copper wire for all DC wiring connections to the screw
terminals between the PV modules and the Connection Unit and between the Connection
Unit and the inverter.
• Make sure that no damaged cables are being used.
• The Photovoltaic System Grounding shall be installed per the requirements of Sections
690.41 through 690.47 of the National Electrical Code
®
, ANSI/NFPA 70 and is the
responsibility of the installer.
6.2 Overview of the Connection Area
6.2.1 Enclosure Openings
Figure 9: Enclosure openings of the Connection Unit
Item Description
A Output conduit openings
(1-inch trade size)
B Input conduit openings (with rain tight hole plugs)
(3/4-inch trade size)
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SMA Solar Technology America LLC 6 Electrical Connection
A+ A−
B− B+
D
C
A
BI
E
G
H
F
6.2.2 Interior View
Figure 10: Components and connection areas in the interior of the Connection Unit 1000-US
Item Description
A Shaft of the DC switch-disconnector
B Terminals for connecting the DC output cables (INPUT B)
C Equipment grounding terminal
D Fuse holders for string fuses and terminals for connecting the negative DC cables
of the PV array ( − ) (INPUT B)
E Fuse holders for string fuses and terminals for connecting the positive DC cables of
the PV array (+) (INPUT B)
F Fuse holders for string fuses and terminals for connecting the negative DC cables
of the PV array ( − ) (INPUT A)
G Fuse holders for string fuses and terminals for connecting the positive DC cables of
the PV array (+) (INPUT A)
H Equipment grounding terminal
I Terminals for connecting the DC output cables (INPUT A)
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6 Electrical Connection SMA Solar Technology America LLC
6.3 Connecting Conduits to the Connection Unit
Required materials:
☐ Conduits of matching trade size as the openings of the Connection Unit
☐ UL-listed rainproof or wet location conduit fittings complying with UL514B of matching trade
size as the openings of the Connection Unit
☐ Rainproof or wet location hole seals or plugs for closing unused output openings in the
enclosure at the top of the Connection Unit
Procedure:
1.
Danger to life due to electric shock
• Make sure that all devices (e.g. inverter) connected to the Connection Unit are switched
off and protected against reconnection (see manual of the respective device).
2.
Damage to the Connection Unit due to moisture ingress
Electronic components in the Connection Unit can be damaged as a result of moisture ingress.
• Seal open ends of any conduits entering the Connection Unit with rain tight cord grips or
a sealing compound.
3. Switch the DC switch-disconnector OFF. Turn the
DC switch-disconnector counterclockwise by 90°.
4. Remove the lid of the Connection Unit. Loosen all
captive screws with an Allen key (AF 4) and
remove the lid by lifting it from below.
5. Remove the adhesive tape from both output openings on top of the Connection Unit.
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SMA Solar Technology America LLC 6 Electrical Connection
6.
Risk of injury when pressing out the filler plugs
• T o co nne ct t he c ond uit s to the inp ut o pen ings of th e Co nne cti on U nit , gently p res s ou t on e
filler plug for each conduit opening from the inside with a blunt object (e.g screwdriver
handle). Make sure not to damage components of the Connection Unit or the filler plugs.
7. Insert one conduit fitting into each corresponding enclosure opening and tighten from within
using a conduit fitting locknut.
8. Attach the conduit to the conduit fitting.
9. Close any unused output opening on top of the Connection Unit with rain tight or wet location
hole seals or plugs.
10. The factory-mounted hole plugs provided with the Connection Unit can be used to seal any
unused input openings.
6.4 Connecting the Grounding Conductor
The Connection Unit is equipped with two terminals for connecting the grounding conductors. Each
terminal has two connection points.
Overview
Figure 11: Terminals for connecting the grounding conductors
Cable requirements:
☐ The cable must be designed in accordance with the local installation requirements and for
temperatures of over +194°F (+90°C).
☐ Cable type: copper wire
☐ Use only solid or Class B or C stranded wire.
☐ Conductor cross-section: 12 to 1AWG (single conductor), 12 to 4 AWG (two conductors)
Requirements:
☐ All conduits must be correctly connected to the Connection Unit (see Section 6.3).
☐ The DC switch-disconnector must be turned OFF and the lid of the Connection Unit must be
dismantled.
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6 Electrical Connection SMA Solar Technology America LLC
Procedure:
1.
Danger to life due to electric shock
• Make sure all devices connected to the Connection Unit (e.g inverter) are switched off
and protected against reconnection (see manual of the respective device).
•Ensure that no DC voltage is present.
2. Lead the grounding conductors into the interior of the Connection Unit.
3. Strip the insulation of the grounding conductor 11/16 in (17 mm).
4. Connect the grounding conductor to one of the termination points of the ground terminal and
tighten with a screwdriver (torque: at least 51.3 in-lb (5.8 Nm)).
5. Ensure that the grounding conductor is securely terminated.
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SMA Solar Technology America LLC 6 Electrical Connection
6.5 Connecting the PV Array
Cable requirements:
☐ The DC cables of the PV array must be designed in accordance with the installation
requirements applicable on site and for temperatures of +194°F (+90°C).
☐ The maximum cable length, which is dependent on the conductor cross-section, must be
adhered to.
☐ Cable type: copper wire
☐ Conductor cross-section: 14 to 6 AWG
Requirements:
☐ The conduits must be correctly connected to the Connection Unit (see Section 6.3).
☐ The DC switch-disconnector must be switched OFF and the lid must be dismantled.
Procedure:
Connect the DC cables of the PV array to INPUT A and B as follows:
1.
Danger to life due to electric shock
• Make sure that all devices (e.g. inverter) connected to the Connection Unit are switched
off and protected against reconnection (see manual of the respective device).
•Cover the PV modules.
2.
Danger to life due to electric shock
The strings in the Connection Unit are combined to two output circuits (A and B). If there is
reverse polarity of a PV string, there can be short-circuit current flowing when string fuses are
inserted, string fuse holders are closed, and the DC switch-disconnector is open.
• Open all string fuse holders.
3. Lead the DC cables of the PV array into the interior of the Connection Unit.
4. Strip the insulation of all cables by
Installation Manual CU1000-US-11-IA-en-13 31
3
⁄8 in (9 mm).
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6 Electrical Connection SMA Solar Technology America LLC
A+
5. Check the positive DC cables for correct polarity
and connect them to the terminals with the plus sign
(+).
6. Tighten the screw terminals with a screwdriver
(Philips size: 2) (torque: 30 in-lb (3.4 Nm)).
7. Check the negative DC cables for correct polarity
and connect them to the terminals with the minus
sign ( − ).
8. Tighten the screw terminals with a screwdriver
(Philips size: 2) (torque: 30 in-lb (3.4 Nm)).
9. Ensure t hat all con duc tors a re s ecu rel y in place and
cannot be detached by pulling.
6.6 Connecting the Output Cables
Additionally required material:
☐ Cables for connecting the Connection Unit to the inverter.
☐ If the DC switch-disconnector should be protected against restarting, a padlock can be used.
Cable requirements:
☐ The DC output cables must be designed in accordance with the installation requirements
applicable on site and for temperatures of +194°F (+90°C).
☐ Cable type: copper wire
☐ Use only solid or Class B or C stranded wire.
☐ Conductor cross-section: 12 to 1AWG (single conductor), 12 to 4 AWG (two conductors)
Padlock requirements:
☐ The material must be non-corrosive and weather-proof.
☐ The shackle of the padlock must be hardened.
☐The lock cylinder must be secured.
Requirements:
☐ The conduits must be correctly connected to the Connection Unit (see Section 6.3).
☐ The DC switch-disconnector must be switched OFF and the lid must be dismantled.
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SMA Solar Technology America LLC 6 Electrical Connection
++
−−
++
−−
++
−−
++
−−
A+ A−
B− B+
Procedure:
Connect the DC output cables for connecting the Connection Unit to the inverter for INPUT A and
INPUT B as follows:
1.
Danger to life due to electric shock
• Make sure all devices connected to the Connection Unit (e.g inverter) are switched off
and protected against reconnection (see manual of the respective device).
•Cover the PV modules.
2. Strip the insulation of the cable ends of the two cables for connecting the Connection Unit to the
inverter by
11
⁄16in (17 mm).
3. Connect a cable to the screw terminal with the
minus sign for connecting the Connection Unit to the
inverter.
4. Tighten the screw terminals with a screwdriver
(torque 51.3 in-lb (5,8 Nm)).
5. Connect a cable to the screw terminal with the plus
sign for connecting the Connection Unit to the
inverter
6. Tighten the screw terminals with a screwdriver
(torque 51.3 in-lb (5,8 Nm)).
7. Mount the lid of the Connection Unit:
• Position the lid in such a way that the protruding
shaft in the Connection Unit snaps into the
provided opening of the DC
switch-disconnector.
• Tighten all lid screws with an Allen key (AF 4)
(torque: 35 in-lb (4 Nm)).
8. In order to protect the DC switch-disconnector
against restarting, lead the shackle of the padlock
through the opening in the switch and lock it.
9. Lead the connected DC output cables through the conduit of the Connection Unit and connect
to the inverter (see inverter installation manual).
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7 Commissioning SMA Solar Technology America LLC
7 Commissioning
7.1 Inserting the String Fuses
Insert the string fuses before commissioning the Connection Unit.
Requirements:
☐ Only UL-listed string fuses according to UL 2579 are permitted.
☐ The fuse size must be 10 mm x 38 mm (midget format).
☐ The maximum allowable fuse rating is 20 A.
Procedure:
1.
Danger to life due to electric shock
• Make sure that all devices (e.g. inverter) connected to the Connection Unit are switched
off and protected against reconnection (see manual of the respective device).
•Ensure that no DC voltage is present.
2. Turn the DC switch-disconnector OFF. Turn the DC
switch-disconnector counterclockwise by 90°.
3. Remove the lid of the Connection Unit. Loosen all
captive screws with an Allen key (AF 4) and
remove the lid by lifting it from below.
4. Open all fuse holders.
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SMA Solar Technology America LLC 7 Commissioning
A+ A−
B−
B+
5. Insert 1 string fuse into each fuse holder.
6. Close all fuse holders.
☑ The fuse holders audibly click when closed
completely.
7. Mount the lid of the Connection Unit:
• Position the lid in such a way that the protruding
shaft in the Connection Unit snaps into the
provided opening of the DC
switch-disconnector.
• Tighten all screws of the lid with an Allen Key
(AF 4) (torque: 35 in-lb (4 Nm)).
8. In order to protect the DC switch-disconnector against restarti ng, le ad t he s hackl e of the pad lock
through the opening in the switch and lock it.
9. Commission the Connection Unit (see Section 7.2).
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7 Commissioning SMA Solar Technology America LLC
7.2 Commissioning the Connection Unit
The Connection Unit is part of the PV system. All parts of the PV system must be mounted and set up
prior to commissioning the Connection Unit.
Commissioning occurs via the inverter circuit breaker (see inverter installation manual).
Requirements:
☐ The Connection Unit must be correctly mounted.
☐ All DC cables must be correctly connected.
☐ String fuses must be inserted in the Connection Unit.
☐ Unused conduit openings of the Connection Unit must be sealed with rain tight or wet location
hole seals or plugs.
☐ Connection Unit must be connected to the inverter.
☐ The Connection Unit and the inverter must be connected by a grounding conductor.
☐ The lid of the Connection Unit must be installed.
☐ The inverter circuit breaker must be correctly rated.
Procedure:
1. Commission the inverter (see inverter installation manual).
2. If the DC switch-disconnector has been protected against restarting, open and detach the
padlock.
3. Turn the DC switch-disconnector of the Connection
Unit counterclockwise by 90° and set to ON.
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SMA Solar Technology America LLC 8 Disconnecting the Connection Unit from Voltage Sources
8 Disconnecting the Connection Unit from Voltage
Sources
1.
Danger to life due to electric shock
• Make sure that all devices (e.g. inverter) connected to the Connection Unit are switched
off and protected against reconnection (see manual of the respective device).
•Cover the PV modules.
2. Turn the DC switch-disconnector of the Connection
Unit counterclockwise by 90° and set to OFF.
3. Remove the lid of the Connection Unit. Loosen all
captive screws with an Allen key (AF 4) and
remove the lid by lifting it from below.
4. Open all fuse holders.
5.
Danger to life due to electric shock
The DC cables are still live if there is sufficient irradiation. Detaching the live DC cables from
the terminals can cause life-threatening electric shocks.
• Ensure that the terminals are voltage-free using a suitable voltage meter.
6. Detach all DC cables from the terminals using a screwdriver.
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9 Troubleshooting SMA Solar Technology America LLC
9 Troubleshooting
9.1 Replacing the String Fuses
Each string fuse is assigned to one string. If one or several string fuses are blown or defective, you
have to replace the respective string fuses.
Requirements:
☐ Only UL-listed string fuses according to UL 2579 are permitted.
☐ The fuse size must be 10 mm x 38 mm (midget format).
☐ The maximum allowable fuse rating is 20 A.
Procedure:
1.
Danger to life due to electric shock
• Make sure that all devices (e.g. inverter) connected to the Connection Unit are switched
off and protected against reconnection (see manual of the respective device).
•Ensure that no DC voltage is present.
2. Turn the DC switch-disconnector OFF. Turn the DC
switch-disconnector counterclockwise by 90°.
3. Remove the lid of the Connection Unit. Loosen all
captive screws with an Allen key (AF 4) and
remove the lid by lifting it from below.
4. Open all safety levers needed all the way.
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SMA Solar Technology America LLC 9 Troubleshooting
A+
A−
B−
B+
5. Remove blown or defective string fuses from the
fuse holders.
6. Insert one new string fuse into each fuse holder.
7. Close all safety levers all the way.
☑ The safety levers audibly click into place.
8. Mounting the lid of the Connection Unit:
• Position the lid in such a way that the protruding
shaft in the Connection Unit snaps into the
provided opening of the DC
switch-disconnector.
• Tighten all screws of the lid with an Allen Key
(AF 4) (torque: 35 in-lb (4 Nm)).
9. Commission the Connection Unit (see Section 7.2).
Installation Manual CU1000-US-11-IA-en-13 39
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10 Decommissioning SMA Solar Technology America LLC
10 Decommissioning
10.1 Disassembling the Connection Unit
1. Disconnect the PV system from voltage sources (see inverter installation manual).
2. Remove all cables from the Connection Unit:
• Disconnect the Connection Unit from voltage sources (see Section 8).
• Release all cables from the terminals using a screwdriver and pull the cables out of the
Connection Unit.
• Unscrew the counter nut of the conduit fittings from the inside.
• Remove the conduit fittings and conduits with cables.
3. Mount the lid of the Connection Unit:
• Position the lid in such a way that the protruding shaft in the Connection Unit snaps into the
provided opening of the DC switch-disconnector.
• Attach all screws of the lid (torque: 35.4 in-lb (4 Nm)).
4. Detach the screws from the mounting straps.
5. Remove the Connection Unit from the building ground.
6. To seal the Connection Unit, insert the original filler plugs or type 3R filler plugs into the
enclosure openings.
10.2 Packing the Connection Unit
• Pack the Connection Unit. Use the original packaging or packaging that is suitable for the
weight and dimensions of the Connection Unit.
10.3 Disposing of the Connection Unit
• Dispose of the Connection Unit in accordance with the applicable local disposal regulations for
electronic waste.
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SMA Solar Technology America LLC 11 Technical Data
11 Technical Data
DC Input
CU 1000-US-11
Maximum number of incoming strings 8
Strings for INPUT A 4
Strings for INPUT B 4
Maximum input voltage 1000 V
DC Output
CU 1000-US-11
Maximum number of outgoing strings 2
Protective Devices
CU 1000-US-11
Overcurrent protection String fuses
Torques
CU 1000-US-11
Fuse holder / terminals for connecting the DC
input cables
Terminals for connecting the DC output cables 51.3 in-lb (5.8 Nm)
Grounding terminals 51.3 in-lb (5.8 Nm)
Lid screws 35.4 in-lb (4.0 Nm)
Installation Manual CU1000-US-11-IA-en-13 41
30 in-lb (3.4 Nm)
Page 42
11 Technical Data SMA Solar Technology America LLC
General Data
Width x height x depth 18 23⁄64 in x 15 11⁄16 in x 5 11⁄32 in
(466 mm x 398 mm x 136 mm)
Weight 22 lb (10 kg)
11
Length x width x height of packaging 22
Transport weight 24 lb (11 kg)
Operating temperature range -40°F to +140°F
Storage temperature range -40°F to +140°F
Maximum permissible value for relative humidity,
non-condensing
Maximum operating altitude above MSL 6,561 ft (2000 m)
Enclosure Protection Rating Type 3R
Approvals and national standards,
as per 05/2016
⁄64 in x 21 3⁄8 in 5 11⁄32 in
(563 mm x 543 mm x 240 mm)
(-40°C to +60°C)
(-40°C to +60°C)
100%
UL1741
CAN/CSA C22.2 No. 107.1-01
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SMA Solar Technology America LLC 12 Contact
12 Contact
If you have technical problems concerning our products, contact the SMA Service Line. We require
the following information in order to provide you with the necessary assistance:
• Device type of the Connection Unit
• Serial number of the Connection Unit
• Type and number of the PV modules connected
• Mounting location and mounting height of the Connection Unit
• LED signal and error message of the inverter if applicable
United
States/
Estados
Unidos
Canada/
Canadá
SMA Solar Technology
America LLC
Rocklin, CA
SMA Solar Technology
Canada Inc.
Mississauga
Toll free for USA, Canada and Puerto Rico / Llamada
gratuita en EE. UU., Canadá y Puerto Rico:
+1 877-MY-SMATech (+1 877-697-6283)
International / Internacional: +1 916 625-0870
Toll free for Canada / gratuit pour le Canada:
+1 877-MY-SMATech (+1 877-697-6283)
Installation Manual CU1000-US-11-IA-en-13 43
Page 44
SMA Solar Technology
www.SMA-Solar.com
SMA Solar Technology America LLC
www.SMA-America.com
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