SMA SC 250U Installation

US

Change from negative to positive grounding

SUNNY CENTRAL 250U

Installation Guide

SC250U_GFDI-IUS101711 | 98-4021211 | Version 1.1

SMA America, LLC Legal Restrictions

Copyright © 2010 SMA America,LLC. All rights reserved.
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written permission of SMA America,LLC.

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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. Neither SMA America,LLC 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
SMAAmerica,LLC reserves the right to make changes without notice and shall not be responsible for
any damages, including indirect, incidental or consequential damages, caused by reliance on the
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any use of such marks by SMA America,LLC is under license.

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Denver, CO 80239 U.S.A.

Installation Guide SC250U_GFDI-IUS101711 3

Important Safety Instructions SMA America, LLC

IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

This manual contains important instructions for Sunny Central 250U P V inverter, that must be f ollowed
during installation and maintenance of the PV inverter.

The Sunny Central 250U is designed and tested according to international safety requirements, but
as with all electrical and electronic equipment, certain precautions must be observed when installing
and/or operating the Sunny Central 250U. To reduce the risk of personal injury and to ensure the
safe installation and operation of the Sunny Central 250U, you must carefully read and follow all
instructions, cautions and warnings in this installation guide.

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.

DANGER

DANGER indicates a hazardous situation which, if not avoided, will result in death or
serious injury.

WARNING

WARNING indicates a hazardous situation which, if not avoided, could result in death or
serious injury.

CAUTION

CAUTION indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.

NOTICE

NOTICE is used to address practices not related to personal injury.

4 SC250U_GFDI-IUS101711 Installation Guide

SMA America, LLC Important Safety Instructions

Other symbols in this document

In addition to the safety and hazard symbols described on the previous pages, the following symbol
is also used in this installation guide:

Information
This symbol accompanies notes that call attention to supplementary information that you

must know and use to ensure optimal operation of the system.

Markings on this product

The following symbols are used as product markings with the following meanings.

Warning regarding dangerous voltage
The product works with high voltages. All work on the product must only be performed

as described in it‘s documentation.

Electric arc hazards
The product has large electrical potential differences between its conductors. Arc flashes

can occur through air when high-voltage current flows. Do not work on the product
during operation.

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 performing any work. Follow all safety

precautions and instructions as described in the documentation.

UL1741 is the standard applied by Underwriters Laboratories to the Sunny Central
250U to certify that it meets the requirements of the National Electrical Code
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 power distribution grid.

®

and IEEE-

Installation Guide SC250U_GFDI-IUS101711 5

General Warnings SMA America, LLC

General warnings

General warnings

All electrical installations must be done in accordance with the local codes and National
Electrical Code

®

ANSI/NFPA 70.

The Sunny Central 250U contains no user-serviceable parts except for the fans on the
bottom of the enclosure and the filters behind the fans as well as the handle covers on the
sides of the unit. For all repair and maintenance, always return the unit to an authorized
SMA Service Center.

Be for e in sta lli ng o r using the Sun ny C ent ral 250 U, read all of the instructions, cautions, and
warnings on the Sunny Central 250U in this installation guide.

Before co nnect ing the Sunny Cent ral 250U to the power d istribution grid, contact the local
power distribution grid company. This connection must be made only by qualified
personnel.

Wiring of the Sunny Central 250U must be made by qualified personnel only.

6 SC250U_GFDI-IUS101711 Installation Guide