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SMA Sunny Central 250U Installation Manual

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Accessories for Sunny Central
Disconnect Unit for
Sunny Central 250U / 500U / 500HE-US/CA and
Sunny Central CP
Installation Guide
DisconACDC_SCUS-IUS103110 | 98-4009010 | Version 1.0
US

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Summary of Contents for SMA Sunny Central 250U

  • Page 1 Accessories for Sunny Central Disconnect Unit for Sunny Central 250U / 500U / 500HE-US/CA and Sunny Central CP Installation Guide DisconACDC_SCUS-IUS103110 | 98-4009010 | Version 1.0...
  • Page 2   SMA America, LLC DisconACDC_SCUS-IUS103110 Installation Guide...
  • Page 3 All such warranties are expressly disclaimed. Neither SMA America, LLC nor its distributors 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.
  • Page 4 Disconnect Unit for Sunny Central 250U / 500U / 500HE‑US and Sunny Central CP, you must carefully read and follow all instructions, cautions and warnings in this installation guide.
  • Page 5 UL1741 is the standard applied by Underwriters Laboratories to the AC/DC- Disconnect Unit for Sunny Central 250U / 500U / 500HE-US/CA to certify that it ® meets the requirements of the National Electrical Code , the Canadian Electrical ®...
  • Page 6 Before installing or using the Disconnect Unit for Sunny Central 250U / 500U / 500HE-US/CA and Sunny Central CP, read all of the instructions, cautions, and warnings on the AC/DC-Disconnect Unit for Sunny Central 250U / 500U / 500HE-US/CA and Sunny Central CP in this installation guide.

  • Page 7: Table Of Contents

    SMA America, LLC Table of Contents Table of Contents Notes on this manual......11 Target group .
  • Page 8 Overview electrical connections ......30 6.1.1 Disconnect Unit for Sunny Central 250U/500U ..... 30 6.1.2 Disconnect Unit for Sunny Central 500HE-US/CA and Sunny Central CP.
  • Page 9 SMA America, LLC Table of Contents Disconnect Unit for Sunny Central 250U/500U ... 65 Disconnect Unit for Sunny Central 500HE-US/CA..66 Disconnect Unit for Sunny Central CP.
  • Page 10   SMA America, LLC DisconACDC_SCUS-IUS103110 Installation Guide...

  • Page 11: Notes On This Manual

    That means, that the Disconnect Unit will be installed on the right side of the Sunny Central. A right system is recommended by SMA due to much shorter cable lengths. If an installation of the Disconnect Unit is required on a left system, observe that all connections are arranged opposite and that all instructions are carried out accordingly.

  • Page 12: Safety

    • It is prohibited to use the inverter and the Disconnect Unit for purposes other than those described here. • It is prohibited to modify the inverter or the Disconnect Unit or to install components that are not explicitly recommended or sold by SMA. DisconACDC_SCUS-IUS103110 Installation Guide...

  • Page 13: Safety Instructions

    SMA America, LLC 2  Safety • It is prohibited to connect the Sunny Central 500HE-US/CA or Sunny Central CP without transformer to the grid. Operating the inverter without transformer causes a short-circuit and can destroy the inverter. 2.2 Safety instructions High voltages are present in the live components of the low-voltage grid.
  • Page 14 • Pay attention to all safety instructions. • Follow all operating instructions. • If problems occur when performing the work described here, contact SMA. Operating a damaged inverter or Disconnect Unit can cause severe injury from electric shock. • The inverter and the Disconnect Unit must only be used when it is technically faultless and safe to operate.

  • Page 15: The Disconnect Unit For Sunny Central

    SMA America, LLC 3  The Disconnect Unit for Sunny Central 3 The Disconnect Unit for Sunny Central 3.1 Operating principles The PV modules convert a portion of sunlight into electrical energy (direct current). The inverter then converts the direct current into alternating current and feeds it into the power distribution grid. This current can be used directly, or it can be sold to your energy provider.

  • Page 16: Scope Of Delivery And Storage

    • For further details about unpacking and transport of the Disconnect Unit see the technical description ”Unpacking AC/DC Disconnect Unit for Sunny Central 250U / 500U / 500HE- US/CA and Sunny Central CP“. • If you need assistance with a damaged Disconnect Unit, contact your dealer or SMA (see chapter 9 ”Contact”, page 69). 4.2 Scope of delivery Figure 3: Scope of delivery Disconnect Unit...

  • Page 17: Storage

    SMA America, LLC 4  Scope of delivery and storage 4.3 Storage Improper storage can cause moisture to seep into the Disconnect Unit. Damage to the Disconnect Unit will result. • The Disconnect Unit must be closed during storage. • If stored for 6 months or longer, make sure the storage area is dry.

  • Page 18: Installation Of The Disconnect Unit

    5  Installation of the Disconnect Unit SMA America, LLC 5 Installation of the Disconnect Unit 5.1 Choosing the installation site 5.1.1 Ambient conditions ☐ The installation location must be accessible at all times. ☐ Ambient temperature: ‒13 °F … +122 °F (‒25 °C … +50 °C). ☐ Humidity 15 % … 95 %. ☐ The Disconnect Unit is not protected from salt fog pariculars, it can not be operated in chemically aggressive environments.

  • Page 19: Position Of The Mounting Holes And Bottom Entry Sleeves

    SMA America, LLC 5  Installation of the Disconnect Unit 5.1.3 Position of the mounting holes and bottom entry sleeves Figure 5: Position mounting holes Installation Guide DisconACDC_SCUS-IUS103110...

  • Page 20: Minimum Clearances

    5  Installation of the Disconnect Unit SMA America, LLC 5.1.4 Minimum clearances Figure 6: Minimum clearance between inverter and Disconnect Unit side-by-side The minimum clearance between Sunny Central and Disconnect Unit side-by-side is required for bending radii for inserting cables through side-entry (see section 5.4 and section 5.5). Minimum clearance can be reduced down to 3 in.

  • Page 21: Dimensions And Weight

    Disconnect Unit for Sunny Central 250U / Sunny Central 500U The Sunny Central with Disconnect Unit has a total weight of approximately 1,323 lb. (600 kg). Figure 8: Dimensions Disconnect Unit for Sunny Central 250U / Sunny Central 500U with roof Installation Guide DisconACDC_SCUS-IUS103110...
  • Page 22 5  Installation of the Disconnect Unit SMA America, LLC Figure 9: Dimensions Disconnect Unit for Sunny Central 250U / Sunny Central 500U without roof DisconACDC_SCUS-IUS103110 Installation Guide...
  • Page 23 SMA America, LLC 5  Installation of the Disconnect Unit Disconnect Unit for Sunny Central 500HE-US/CA and Sunny Central CP The Sunny Central with Disconnect Unit has a total weight of approximately 1,323 lb. (600 kg). Figure 10: Dimensions Disconnect Unit for Sunny Central 500HE-US/CA and Sunny Central CP with roof...

  • Page 24: Installing The Disconnect Unit Onto The Base

    Regard the heavy weight of the Disconnect Unit. • Use a cran to move the Disconnect Unit. Refer to technical description ”Unpacking Disconnect Unit for Sunny Central 250U/500U/500HE-US/CA” for further information. • Move the Disconnect Unit to its position onto the base.

  • Page 25: Opening The Disconnect Unit

    SMA America, LLC 5  Installation of the Disconnect Unit 5.3 Opening the Disconnect Unit ☐ The front consists of a single front plate fixed by screws. Regard the heavy weight of the front plate. Two persons are needed to move the front plate of this variant of the Disconnect Unit.
  • Page 26 5  Installation of the Disconnect Unit SMA America, LLC Danger of crushing Regard the heavy weight and the measures of the front plate. • Two persons are needed to move the front plate of the Disconnect Unit. • Make sure that one person always hold the front plate of the enclosure while the other person performs work at it.

  • Page 27: Preparation Of The Cable Entries

    SMA America, LLC 5  Installation of the Disconnect Unit 10. Unhook the front plate of the enclosure by pulling it upwards. 11. Move the front plate for approximately 8 in. (200 mm) and hold it with 2 hands. 12. Remove the ground strap from the bottom left corner of the front plate.
  • Page 28 5  Installation of the Disconnect Unit SMA America, LLC 1. Determine the entering side of the cables. There are plates for cable entries on both sides and at the bottom of the Disconnect Unit. 2. For every plate which is used for cable input proceed as follows: •...

  • Page 29: Inserting Cables Into The Disconnect Unit

    SMA America, LLC 5  Installation of the Disconnect Unit 5.5 Inserting cables into the Disconnect Unit Ingressing moisture caused by insufficient sealing. Water and moisture can ingress through unsealed openings. ® • Use fittings and conduits to seal all openings as required by the National Electrical Code ANSI/NFPA 70.

  • Page 30: Electrical Connection

    SMA America, LLC 6 Electrical connection 6.1 Overview electrical connections 6.1.1 Disconnect Unit for Sunny Central 250U/500U The following illustration gives an overview of a Disconnect Unit for Sunny Central 250U and Sunny Central 500U. Position Description Connection for ungrounded DC to inverter...

  • Page 31: Disconnect Unit For Sunny Central 500He-Us/Ca And Sunny Central Cp

    SMA America, LLC 6  Electrical connection 6.1.2 Disconnect Unit for Sunny Central 500HE-US/CA and Sunny Central CP Figure 13: Overview electrical connection Position Description Connection for ungrounded DC to inverter PE busbar Connection for ungrounded DC from PV-plant Busbars for AC to power distribution grid Busbars for AC from inverter...

  • Page 32: Cable Requirements

    , ANSI/NFPA 70, the installer is responsible for this grounding. Maximum numbers of DC inputs Maximum number of DC inputs for Sunny Central 250U Maximum number of DC inputs for Sunny Central 500U / 500HE-US / CA and Sunny Central CP DisconACDC_SCUS-IUS103110...

  • Page 33: Connecting Dc Cables To The Disconnect Unit

    SMA America, LLC 6  Electrical connection 6.3 Connecting DC cables to the Disconnect Unit 6.3.1 Connection sequence DC switches 600 V Depending on your order the Disconnect Unit contains up to five DC switches. The following illustration shows the connection sequence for the Disconnect Unit for Sunny Central.

  • Page 34: Connecting Dc Cables To Dc Load Break Switch With Screw Terminals

    6  Electrical connection SMA America, LLC Figure 15: Connection sequence DC-switches to PV-plant 6.3.2 Connecting DC cables to DC load break switch with screw terminals Voltage is present in PV modules exposed to light. Death resulting from electric shock. • Cover the PV modules.
  • Page 35 SMA America, LLC 6  Electrical connection Normally grounded conductors may be ungrounded and energized when a ground- fault is indicated. Risk of electric shock. • Test before touching. • Work on the Disconnect Unit must be carried out by qualified personnel.

  • Page 36: Connecting Dc Cables To Dc Load Break Switch With Cable Lugs

    6  Electrical connection SMA America, LLC 3. Plug the copper conductor of the cable into the screw terminal and tighten it with the specified torque (see section 6.2 ”Cable requirements”, page 32). Torque at pre-mounted screw terminals The screw terminals are pre-mounted upon delivery.
  • Page 37 SMA America, LLC 6  Electrical connection Figure 17: Connection of DC cables to busbar with cable lug Position Description Screw head - size: M 12 Spring washer Washer Cable lug Busbar Nut - size: M 12 Procedure of connecting Oxide layers on contact surfaces after transport and storing of the Disconnect Unit.

  • Page 38: Connecting Sequence For Single Dc Load Break Switch, 600 V

    6  Electrical connection SMA America, LLC 3. Tighten the screw with a nut in a clockwise direction. For torques refer to the table (see section 6.2 ”Cable requirements”, page 32). 4. Connect all DC cables as illustrated above. 6.3.4 Connecting sequence for single DC load break switch, 600 V Every DC load break switch disconnects 2 DC strings at the same time.

  • Page 39: Connecting Sequence For Single Dc Load Break Switch, 1,000 V

    SMA America, LLC 6  Electrical connection 6.3.5 Connecting sequence for single DC load break switch, 1,000 V Every DC load break switch disconnects 2 DC strings at the same time. Refer to the following illustration for connecting the cable from the PV plant and from the inverter to the DC load break switch, if the Disconnect Unit is located on the right side of the Sunny Central.

  • Page 40: Connecting Ac Cables To The Disconnect Unit

    The Disconnect Unit for Sunny Central 500HE-US/CA and Sunny Central CP is provided with UL listed circuit breaker on output rated 1,600 A for branch circuit protection. The AC output of the Disconnect Unit with Sunny Central 250U/500U must be fused externally by the installer.

  • Page 41: Arranging Ac Cables

    SMA America, LLC 6  Electrical connection 6.4.2 Arranging AC cables This section explains how to arrange the AC cables to minimize the interferences between the different phases. Make sure that the cables of the different phases have got the same length. Cable arragement for AC cables shorter than 6 ...

  • Page 42: Overview Ac Connection To Power Distribution Grid

    SMA America, LLC Figure 22: AC cable arrangement 2 Figure 23: AC cable arrangement 3 6.4.3 Overview AC connection to power distribution grid AC connection Disconnect Unit for Sunny Central 250U/Sunny Central 500U D IS C O N N E C T U N IT SM A Figure 24: Overview AC connection to power distribution grid with AC switch 400 A...
  • Page 43 SMA America, LLC 6  Electrical connection D IS C O N N E C T U N IT SM A Figure 25: Overview AC connection to power distribution grid with AC switch 800 A Figure 26: Overview AC connection to power distribution grid with cable lugs...
  • Page 44 6  Electrical connection SMA America, LLC Figure 27: Overview AC connection to power distribution grid with screw terminals AC connection Disconnect Unit for Sunny Central 500HE-US/CA/Sunny Central Figure 28: Overview AC connection to power distribution grid - phases DisconACDC_SCUS-IUS103110 Installation Guide...
  • Page 45 SMA America, LLC 6  Electrical connection Figure 29: Overview connection sequence AC switch to power distribution grid Arrangement of elements AC connection To make sure that you can reach all nuts and screws with a torque-wrench, arrange all screw terminals, screws, nuts, washers and spring washers as shown in the figures below.
  • Page 46 6  Electrical connection SMA America, LLC Figure 31: Overview AC connection to power distribution grid with cable lugs - phase A Figure 32: Overview AC connection to power distribution grid with screw terminals ‒ phases B and C DisconACDC_SCUS-IUS103110 Installation Guide...

  • Page 47: Overview Ac Connection To The Inverter

    6  Electrical connection Figure 33: Arrangement of elements AC connection to power distribution grid with screw terminals ‒ phase A 6.4.4 Overview AC connection to the inverter AC connection Disconnect Unit for Sunny Central 250U/Sunny Central 500U D IS C O N N E C T U...
  • Page 48 6  Electrical connection SMA America, LLC D IS C O N N E C T U N IT SM A Figure 35: Overview AC connection to inverter with AC switch 800 A - phases AC connection Disconnect Unit for Sunny Central 500HE-US/CA/Sunny Central Figure 36: Overview AC connection to inverter - phases...
  • Page 49 SMA America, LLC 6  Electrical connection Figure 37: Overview connection sequence AC switch to inverter Arrangement of elements AC connection To make sure that you can reach all nuts and screws with a torque-wrench, arrange all screw terminals, screws, nuts, washers and spring washers as shown in the figures below.

  • Page 50: Connecting Ac Cables To Busbars

    6  Electrical connection SMA America, LLC Arrangement of elements AC connection to inverter with screw terminals 6.4.5 Connecting AC cables to busbars High voltages are present in the live components of the low voltage grid. Death resulting from burning and electric shock.
  • Page 51 SMA America, LLC 6  Electrical connection Connecting AC cables to busbars with screw terminals Figure 39: Connection of AC cables to busbar with screw terminals Position Description Nut ‒ size: M 12 Spring washer Washer Screw terminal Busbar Screw head ‒ size: M12 1.
  • Page 52 6  Electrical connection SMA America, LLC If necessary, tighten the screw terminal to the busbar again using a torque wrench with a torque of 27 ft‒lbs. (37 Nm). Connecting AC cables to busbars with cable lugs Figure 40: Connection of AC cables to busbar with copper cable lug...

  • Page 53: Connecting Protective Earth

    SMA America, LLC 6  Electrical connection Connecting procedure Oxide layers on contact surfaces after transport and storing of the Disconnect Unit. Yield loss resulting due to poor electrical conductivity. • Before connecting the cables, clean the contact surfaces. • Use only the non-woven abrasive delivered with the Sunny Central.
  • Page 54 6  Electrical connection SMA America, LLC Figure 41: Overview busbar protective earth Position Description Neutral busbar PE busbar *  only for Sunny Central 250U/500U DisconACDC_SCUS-IUS103110 Installation Guide...

  • Page 55: Connecting Protective Earth To Busbar

    SMA America, LLC 6  Electrical connection 6.5.2 Connecting protective earth to busbar You can connect up to 4 PE cables to the busbar(s). For every PE cable carry out the following instruction. 1. Strip the PE cable by about 1  ⁄  in. (30 mm).

  • Page 56: Closing The Disconnect Unit

    6  Electrical connection SMA America, LLC 6.6 Closing the Disconnect Unit ☐ The handles on the front plate of the enclosure must be set to ”Off”, so that the shafts can snap ☐ The 2 mounting clamps for the front plate of the enclosure must be set to the correct position (see figure below).
  • Page 57 SMA America, LLC 6  Electrical connection 3. Tip the front plate of the enclosure with two persons in such way, that the upper edge of it points towards the Disconnect Unit. Hook the front plate of the enclosure into the two mounting clamps at the front of the Disconnect Unit.

  • Page 58: Affixing Information About Grounded Path

    6  Electrical connection SMA America, LLC 9. Make sure that all switches function properly by switching them into position ”On” and back to position ”Off”. The switches function properly if there is no backlash of the shafts and the switches make a clear sound.
  • Page 59 SMA America, LLC 6  Electrical connection 2. Affix the label that indicates the grounded path of the DC system to the front plate of the Disconnect Unit. There are 2 labels included in the scope of delivery for indicating the grounded path of the DC system.

  • Page 60: Operating The Disconnect Unit

    7  Operating the Disconnect Unit SMA America, LLC 7 Operating the Disconnect Unit 7.1 Arrangement of the switches Figure 43: Arrangement of the switches DisconACDC_SCUS-IUS103110 Installation Guide...

  • Page 61: Switching On The Disconnect Unit

    ”On”. You need to push/pull sharply in order to move the switches. 2. For Disconnect Unit for Sunny Central 250U⁄500U: • Turn the AC breaker to the right into position ”On”. You need to push/pull sharply in order to move the switch.

  • Page 62: Switching Off The Disconnect Unit

    7  Operating the Disconnect Unit SMA America, LLC 7.3 Switching off the Disconnect Unit 1. For Disconnect Unit for Sunny Central 250U⁄500U: • Turn the AC breaker to the left into position ”Off”. You need to push/pull sharply in order to move the switch.

  • Page 63: Securing Against Reconnection - Lock-Off Function

    SMA America, LLC 7  Operating the Disconnect Unit 7.4 Securing against reconnection – Lock-Off function Figure 44: Dimensions of padlock for securing against reconnection Position Description Diameter padlock: ⁄  in. …  ⁄  in. (5 mm … 8 mm) 1. For all DC switches: • Strongly turn the switch to the left into position ”Off”.
  • Page 64 7  Operating the Disconnect Unit SMA America, LLC 2. For Disconnect Unit for Sunny Central 500HE-US/ CA and Sunny Central CP: • Close the cover of the AC breaker. 3. Attach a suitable padlock to the cover of the circuit‑breaker. DisconACDC_SCUS-IUS103110 Installation Guide...

  • Page 65: Technical Data

    Minimum operating frequency 59.3 Hz Nominal operating frequency 60 Hz Maximum operating frequency 60.5 Hz AC connection data with Sunny Central 250U connected Maximum continuous output current 300.7 A Maximum continuous output power 250 kVA AC connection data with Sunny Central 500U connected Maximum continuous output current 601.4 A...

  • Page 66: Disconnect Unit For Sunny Central 500He-Us/Ca

    8  Technical data SMA America, LLC Weight 1,323 lbs. (600 kg) Front plate of the enclosure Width 5 ft. 7 in. (1,700 mm) Height 4 ft. 7  ⁄  in. (1,400 mm) Weight 88 lbs. (40 kg) Ambient conditions Maximum operating altitude above sea level for 6,500 ft. (2,000 m) nominal operation. Operating temperature range −...

  • Page 67: Disconnect Unit For Sunny Central Cp

    SMA America, LLC 8  Technical data General data W x H x D including mounting lug for Sunny 4 ft. 11 in. x 7 ft. 3 ⁄  in. x 3 ⁄  ft. Central 500HE‑US / Sunny Central xxxCP (1,500 mm x 2,225 mm x 960 mm) Weight 1,323 lbs. (600 kg) Front plate of the enclosure Width 6 ft. 2  ⁄  in. (1,900 mm) Height 4 ft. 7 ...
  • Page 68 8  Technical data SMA America, LLC Maximum continuous output power at 122 °F 800 kVA (50 °C) General data W x H x D including mounting lug for Sunny 4 ft. 11 in. x 7 ft. 3 ⁄  in. x 3 ⁄  ft. Central 500HE‑US / Sunny Central xxxCP (1,500 mm x 2,225 mm x 960 mm) Weight 1,323 lbs. (600 kg) Front plate of the enclosure Width 6 ft.

  • Page 69: Contact

    SMA America, LLC 9  Contact 9 Contact If you have technical problems concerning our products, contact the SMA Serviceline. We require the following information in order to provide you with the necessary assistance: • Sunny Central device type • Sunny Central serial number •...
  • Page 70 9  Contact SMA America, LLC DisconACDC_SCUS-IUS103110 Installation Guide...
  • Page 71 SMA America, LLC   Installation Guide DisconACDC_SCUS-IUS103110...
  • Page 72   SMA America, LLC SMA A DisconACDC_SCUS-IUS103110 Installation Guide...

This manual is also suitable for:

Sunny central 500uSunny central 500he-us/caSunny central cp

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