Accessories for PV Inverters SMA CONNECTION UNIT 600-US / 1000-US Installation Manual CU600-1000US-IA-en-10 | IMEN-CU-US | Version 1.
SMA America, LLC Legal Provisions Legal Provisions Copyright © 2013 SMA 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, electronic, mechanical, photographic, magnetic or otherwise, without the prior written permission of SMA America, LLC. Neither SMA America, LLC nor SMA Solar Technology Canada Inc.
IMPORTANT SAFETY INSTRUCTIONS SMA America, LLC IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions for the following products: • CU 600-US-10 (SMA Connection Unit 600-US) • CU 1000-US-10 (SMA Connection Unit 1000-US) This manual must be followed during installation and maintenance.
SMA America, LLC IMPORTANT SAFETY INSTRUCTIONS 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.
General Warnings SMA America, LLC General Warnings All electrical installations must be made in accordance with the local and National Electrical Code® ANSI/NFPA 70 or the Canadian Electrical Code® CSA C22.1. This document does not and is not intended to replace any local, state, provincial, federal or national laws, regulation or codes applicable to the installation and use of the product, including without limitation applicable electrical safety codes.
SMA 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 . . . . . . . . . . . . . . . . . . . .
Table of Contents SMA America, LLC 7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 7.1 Inserting the String Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 7.2 Commissioning the Connection Unit . . . . . . . . . . . . . . . . . . . . . . . . . 42 8 Disconnecting the Connection Unit from Voltage Sources . . . 43 9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 9.1 LED Signals . . . . .
SMA America, LLC 1 Information on this Document 1 Information on this Document Validity This document is valid for the following device types: • CU 600-US-10 (SMA Connection Unit 600-US) • CU 1000-US-10 (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).
2 Safety SMA America, LLC 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 Designation A PV 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.
SMA America, LLC 2 Safety 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. 2.2 Skills of Qualified Persons The tasks described in this document must be performed by qualified persons only.
2 Safety SMA 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 prevent personal injury or property damage and to ensure long-term operation of the product, read this section carefully and follow all safety precautions at all times.
SMA America, LLC 3 Scope of Delivery 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.
4 Product Description SMA America, LLC 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 Designation A DC switch-disconnector B Captive screws of the lid C Type 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.
SMA 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.
4 Product Description SMA America, LLC 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.
SMA America, LLC 4 Product Description The minimum size of the string fuses and cables is calculated by means of the short-circuit current rating (ISC) of the PV module. The National Electrical Code® stipulates that all string fuses and cables are designed to be at least 1.56 times as large as the Isc of the PV module being used. The correct size of the string fuse is determined by calculating the minimum size and then rounding it up to the nearest standard size for string fuses.
5 Mounting SMA America, LLC 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.
SMA America, LLC 5 Mounting Dimensions for mounting: Figure 6: Dimensions of the mounting points Installation Manual CU600-1000US-IA-en-10 19
5 Mounting SMA America, LLC 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 must be exactly below the openings for the DC connection of the Sunny Tripower.
SMA America, LLC 5 Mounting Recommended clearances: ☐ Observe recommended clearances to the walls or other objects. Thus, you can read the following data from the type label 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. Thus, you can operate the DC switch-disconnector anytime and read out the switch position.
5 Mounting SMA America, LLC Permitted mounting positions: ☐ The Connection Unit must be mounted in a permitted position. That prevents moisture from entering the Connection Unit.
SMA America, LLC 5 Mounting 5.2 Mounting the Connection Unit on a Wall 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 inserted filler plugs.
5 Mounting SMA America, LLC 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.
SMA America, LLC 5 Mounting 5.3 Mounting the Connection Unit to a Post 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 inserted filler plugs. Additionally required mounting material (not included in the scope of delivery): ☐ 2 screws suitable for the building ground ☐ 2 washers to match the screws ☐ 2 screw anchors suitable for the building ground and the screws.
6 Electrical Connection SMA America, LLC 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 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. • Prior to performing any work on the Connection Unit, disconnect it from any voltage source as described in this document (see Section 8).
SMA America, LLC 6 Electrical Connection 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.
6 Electrical Connection SMA America, LLC 6.2.
SMA America, LLC 6 Electrical Connection 6.2.
6 Electrical Connection SMA America, LLC 6.3 Connecting Conduits to the Connection Unit Additionally required material (not included in the scope of delivery): ☐ Conduits made out of metal that match the openings of the Connection Unit ☐ UL-listed rainproof or wet location conduit fittings complying with UL514B that match the openings of the Connection Unit ☐ UL-listed type 3R filler plugs for closing unused output openings in the enclosure at the top of the Connection Unit Procedure: 1.
SMA America, LLC 6 Electrical Connection 6. Risk of injury when pressing out the filler plugs • To connect the conduits to the input openings of the Connection Unit, gently press out one filler plug for each conduit from the inside with a blunt object (e.g screwdriver handle). Make sure not to damage components of the Connection Unit or of the filler plugs. 7. Insert one conduit fitting each into the corresponding enclosure opening and tighten from within using the counter nut. 8.
6 Electrical Connection SMA America, LLC 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. 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.
SMA America, LLC 6 Electrical Connection 6.5 Connecting the PV Array to the Connection Unit 600-US 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 DC input and output circuits are isolated from the enclosure and that system grounding, if required by Section 250 of the National Electrical Code® , ANSI/NFPA 70, is the responsibility of the installer.
6 Electrical Connection SMA America, LLC 5. Check the positive DC cables for correct polarity and insert them all the way into the square opening with the plus sign (+) on the bottom of the fuse holder. 6. Tighten the fuse holder screws with a Philips screwdriver (Philips size: 2) (torque: 30 in-lb. (3.4 Nm)). 7. Check the negative DC cables for correct polarity and insert them all the way into the square opening with the minus sign ( − ) on the bottom of the fuse holder. 8.
SMA America, LLC 6 Electrical Connection 6.6 Connecting the PV Array to the Connection Unit 1000-US 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 DC input and output circuits are isolated from the enclosure and that system grounding, if required by Section 250 of the National Electrical Code® , ANSI/NFPA 70, is the responsibility of the installer.
6 Electrical Connection SMA America, LLC 4. Strip the insulation of all cables by 13⁄32 in. (10 mm). 5. Check the positive DC cables for correct polarity and connect them to the terminals with the plus sign (+). Tip: the reverse polarity detection can be carried out after connecting each string (see Section 6.7 "Operating the Reverse Polarity Detection", page 36). 6. Tighten the screw terminals with a screwdriver (blade width: 4) (torque: 15 in-lb. (1.7 Nm)). 7.
SMA America, LLC 6 Electrical Connection Procedure: 1. Establish the DC voltage supply. 2. Press the button for reverse polarity detection once. ☑ The middle LED glows green for a few seconds. All DC cables are correctly connected. How long the LED glows depends on the level of the applied DC voltage. ✖ The left LED glows red for a few seconds? How long the LED glows depends on the level of the applied DC voltage. At least two of the connected cables at INPUT B are connected with reversed polarity.
6 Electrical Connection SMA America, LLC 6.8 Connecting the DC Output Cable for the Inverter to the Connection Unit Additionally required mounting material (not included in the scope of delivery): ☐ Two cables for connecting the Connection Unit to the inverter. ☐ If the DC switch-disconnector should be protected against restarting, a padlock can be used.
SMA America, LLC 6 Electrical Connection 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 (blade width: 6 mm) (torque 51 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.
7 Commissioning SMA 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. ☐ 600 V string fuses must be inserted for the Connection Unit 600-US. ☐ 1,000 V string fuses must be inserted for the Connection Unit 1000-US. ☐ The fuse size must be 10 mm x 38 mm (midget format). ☐ Only maximum 20 A string fuses are permitted. Procedure: 1.
SMA America, LLC 7 Commissioning 4. Open all safety levers needed all the way. 5. Insert 1 string fuse into each fuse holder. 6. Close all safety levers all the way. ☑ The safety levers audibly click into place. 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.
7 Commissioning SMA 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 three-pole 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.
SMA 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. Disassemble the lid of the Connection Unit.
9 Troubleshooting SMA America, LLC 9 Troubleshooting 9.1 LED Signals The LEDs are part of the reverse polarity detection of the Connection Unit 1000-US and signalize if a string has been connected correctly or with the wrong polarity.
SMA America, LLC 9 Troubleshooting 9.2 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. ☐ 600 V string fuses must be inserted for the Connection Unit 600-US. ☐ 1,000 V string fuses must be inserted for the Connection Unit 1000-US. ☐ The fuse size must be 10 mm x 38 mm (midget format).
9 Troubleshooting SMA America, LLC 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.
SMA America, LLC 10 Decommissioning 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.
11 Technical Data SMA America, LLC 11 Technical Data DC Input CU 600-US-10 CU 1000-US-10 Maximum number of incoming strings 8 8 Strings for INPUT A 4 4 Strings for INPUT B 4 4 600 V 1,000 V CU 600-US-10 CU 1000-US-10 2 2 CU 600-US-10 CU 1000-US-10 Not available available String fuses String fuses CU 600-US-10 CU 1000-US-10 Fuse holder / terminals for connecting the DC input cables 30 in-lb. (3.4 Nm) 15 in-lb. (1.7 Nm) Terminals for connecting the DC output cables 51 in-lb. (5.
SMA America, LLC 11 Technical Data 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 Length x width x height of packaging 22 lb. (10 kg) 22 11 ⁄64 in. x 21 3⁄8 in. 5 11⁄32 in. (563 mm x 543 mm x 240 mm) Transport weight Operating temperature range 24 lb.
12 Accessories SMA America, LLC 12 Accessories You will find the corresponding accessories and spare parts for your product in the following overview. If required, these can be ordered from SMA or your specialty retailer.
SMA America, LLC 13 Contact 13 Contact If you have technical problems concerning our products, contact the SMA Service Line.
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