SMA SC 500CP-US Maintenance Manual - Manual (Page 10)

2 Safety SMA America, LLC
10 SCCP-US-WH-US_en-30 Maintenance Manual
2 Safety
In this section, you will find general safety precautions which you must observe whenever working on the Sunny Central
inverter. Pay special attention to these sections to avoid personal injury and property damage.
2.1 Intended Use
The Sunny Central CP-US is a PV inverter which converts the direct current generated in the PV modules into grid-compliant
alternating current. An external MV transformer fitted downstream feeds the alternating current generated into the utility
grid.
The inverter is designed for indoor and outdoor installation. The inverter is only licensed for use with a suitable transformer
and providing that the maximum permissible DC input voltage and the permitted ambient conditions are complied with.
The transformer must be designed for voltages that arise during pulsed mode of the inverter.
The inverter has been evaluated by UL for compliance with UL 1741 / IEEE 1547 requirements at the inverter’s terminals
on the local area side of an interconnection transformer for all IEEE 1547 tests other than for Unintentional Islanding. It
has additionally been evaluated for selected tests for use with UL Recognized Component low-voltage transformers as
noted in the table below:
The inverter has not been evaluated for exporting current into low-voltage electrical power system (EPS) with local loads
present, and must connect to the medium voltage EPS via an externally-provided medium-voltage transformer.
The external medium-voltage transformer shall provide isolated primary and secondary windings rated for the output
voltage and kVA rating of the inverter. The medium-voltage transformer shall be located between the output of the inverter
and the medium-voltage utility power connection.
The Authority Having Jurisdiction (AHJ) must consider the effect of the medium-voltage transformer provided in the field
with respect to electrical ratings, impedance, and the resultant effects on the utility interconnection performance of the
inverter, with respect to the ratings and impedance of the transformer selected.
The inverter has not been evaluated for an installation of multiple inverters connected to one transformer. The Authority
Having Jurisdiction shall determine if any additional evaluation is necessary of such a system.
The inverter can optionally be equipped with an AC power switch for "branch circuit protection". This AC circuit breaker
simultaneously acts as the AC Disconnect in accordance with NEC ANSI/NFPA 70 and CEC. For inverters without an
AC circuit breaker, "branch circuit protection" and an AC Disconnect must be implemented by the installer. Further
information is provided in section 3.1.
The inverter with an integrated AC Disconnect can be optionally ordered with an Integrated DC Switch in order to be
able to disconnect the inverter from the PV array. If the inverter does not have an Integrated DC Switch, an external DC
Disconnect must be installed in accordance with NEC ANSI/NFPA 70 and CEC, in order to be able to disconnect the
inverter from the PV array.
The models SC 850CP-US-10 and SC 900CP-US-10 are only provided with transfer trip functionality to meet
unintentional islanding requirements. An external signal is required from the utility (EPS) to cause the inverter to
cease-to-energize the EPS during an island condition. Both inverters have also been tested for automatic unintentional
islanding performance (IEEE 1547.1 chapter 5.7, "Unintentional Islanding") up to 880 kVA AC power.
Test Manufacturer Model Electrical Ratings
Unintentional Islanding Test J. Schneider DLGX
1000F-1016TO1001
Primary 289 V
Secondary 480 V, 1,000 kVA
Synchronization, Harmonics,
and Open Phase
J. Schneider DLGX
1250F-1001TO1001
Primary 480 V / 1,500 A
Secondary 480 V / 1,500 A, 1,250 kVA
:$51,1*
If the unit is not provided with a GFDI or insulation monitoring device, this inverter must be used with an
external GFDI as required by the Article 690 of the National Electrical Code
®
for the installation location or
an external insulation monitoring device according to UL 1741.