Xantrex Technology PV225S-480-P User Manual
PV225S 225 kW
Grid-Tied
Photovoltaic
Inverter
PV225S-480-P
Operation and Maintenance Manual
PV225S 225 kW Grid-Tied
Photovoltaic Inverter
Operation and Maintenance Manual
About Xantrex
Xantrex Technology Inc. is a world-leading supplier of advanced power electronics and controls with products from
50 watt mobile units to one MW utility-scale systems for wind, solar, batteries, fuel cells, microturbines, and backup
power applications in both grid-connected and stand-alone systems. Xantrex products include inverters, battery
chargers, programmable power supplies, and variable speed drives that convert, supply, control, clean, and distribute
electrical power.
Trademarks
PV225S 225 kW Grid-Tied Photovoltaic Inverter is a trademark of Xantrex International. Xantrex is a registered
trademark of Xantrex International.
Other trademarks, registered trademarks, and product names are the property of their respective owners and are used
herein for identification purposes only.
Notice of Copyright
PV225S 225 kW Grid-Tied Photovoltaic Inverter Operation and Maintenance Manual© August 2005 Xantrex
International. All rights reserved.
Disclaimer
UNLESS SPECIFICALLY AGREED TO IN WRITING, XANTREX TECHNOLOGY INC. (“XANTREX”)
(a) MAKES NO WARRANTY AS TO THE ACCURACY, SUFFICIENCY OR SUITABILITY OF ANY
TECHNICAL OR OTHER INFORMATION PROVIDED IN ITS MANUALS OR OTHER DOCUMENTATION.
(b) ASSUMES NO RESPONSIBILITY OR LIABILITY FOR LOSS OR DAMAGE, WHETHER DIRECT,
INDIRECT, CONSEQUENTIAL OR INCIDENTAL, WHICH MIGHT ARISE OUT OF THE USE OF SUCH
INFORMATION. THE USE OF ANY SUCH INFORMATION WILL BE ENTIRELY AT THE USER’S RISK.
Date and Revision
August 2005 Revision B
Part Number
152607
Contact Information
Telephone: 1 800 670 0707 (toll free North America)
Fax: 1 800 994 7828 (toll free North America)
Email: customerservice@xantrex.com
Web: www.xantrex.com
1 360 925 5097 (direct)
1 360 925 5143 (direct)
About This Manual
Purpose
The purpose of this Operation and Maintenance Manual is to provide explanations
and procedures for operating, maintaining, and troubleshooting the PV225S 225
kW Grid-Tied Photovoltaic Inverter. Installation instructions are available in the
PV225S 225 kW Grid-tied Photovoltaic Inverter Planning and Installation
Manual.
Scope
This Manual provides safety guidelines and information about operating and
troubleshooting the unit.
Audience
This Manual is intended for anyone who needs to operate the PV225S 225 kW
Grid-Tied Photovoltaic Inverter. Operators must be familiar with all the safety
regulations pertaining to operating high-voltage equipment as dictated by local
code. Operators must also have a complete understanding of this equipment’s
features and functions.
Organization
This Manual is organized into five chapters and one appendix.
Chapter 1, “Introduction” contains information about the features and functions of
the PV225S 225 kW Grid-Tied Photovoltaic Inverter.
Chapter 2, “Operation” contains information on the basic operation of the
PV225S 225 kW Grid-Tied Photovoltaic Inverter.
Chapter 3, “Commissioning” contains information on safely commissioning the
PV225S 225 kW Grid-Tied Photovoltaic Inverter.
Chapter 4, “Troubleshooting” contains information and procedures for
troubleshooting the PV225S 225 kW Grid-Tied Photovoltaic Inverter. It provides
descriptions of common situations and errors that may occur and provides
possible solutions for resolving fault conditions. It also provides instructions for
clearing faults manually, if required.
Chapter 5, “Preventative Maintenance” contains information and procedures for
performing preventative maintenance on the PV225S 225 kW Grid-Tied
Photovoltaic Inverter.
Appendix A provides the environmental and electrical specifications for the
PV225S 225 kW Grid-Tied Photovoltaic Inverter.
152607 iii
About This Manual
Conventions Used
The following conventions are used in this guide.
WARNING
Warnings identify conditions or practices that could result in personal injury or loss of life.
CAUTION
Cautions identify conditions or practices that could result in damage to the unit or other
equipment.
Important:
serious as a caution or warning.
This Manual contains information for the PV225S-480-P 225 kW Grid-Tied
Photovoltaic Inverter. Throughout the manual it will be referred to as the PV225S,
unless otherwise noted.
These notes describe things which are important for you to know, but not as
iv 152607
Abbreviations and Acronyms
CCU2 Converter Control Unit 2
CFM Cubic Feet per Minute
CW Clockwise
DSP Digital Signal Processor
FPGA Field Programmable Gate Array
GUI Graphical User Interface
IEEE Institute of Electrical and Electronics Engineers
IGBT Insulated Gate Bipolar Transistor
IPM Intelligent Power Module
kcmil 1000 circular mils
LAN Local Area Network
POTS Plain Old Telephone Service
PSL Phase-Shift Loop
PV Photovoltaic
UFCU Universal Frontpanel Control Unit
About This Manual
Related Information
You can find more information about Xantrex Technology Inc. as well as its
products and services at www.xantrex.com.
152607 v
vi
Important Safety Instructions
SAVE THESE INSTRUCTIONS - DO NOT DISCARD
This manual contains important safety instructions for the PV225S that must be
followed during installation and maintenance procedures.
WARNING: Shock Hazard
Read and keep this Operation and Maintenance Manual for future reference.
Before installing the PV225S, read all instructions, cautionary markings, and all other
appropriate sections of this manual. Failure to adhere to these warnings could result in
severe shock or possible death. Exercise extreme caution at all times to prevent accidents.
WARNING: Shock Hazard
The PV225S enclosures contain exposed high voltage conductors. The enclosure doors
should remain closed with the latches tightened, except during maintenance or testing.
These servicing instructions are for use by qualified personnel who meet all local and state
code requirements for licensing and training for the installation of Electrical Power
Systems with AC and DC voltage to 600 volts. To reduce the risk of electric shock, do not
perform any servicing other than that specified in the installation instructions unless you
are qualified to do so. Do not open the cabinet doors if extreme moisture is present (rain or
heavy dew).
WARNING: Lethal Voltage
In order to remove all sources of voltage from the PV225S, the incoming power must be
de-energized at the source. This may be done at the main utility circuit breaker and by
opening the AC Disconnect and the DC Disconnect Switches on the PV225S. Review the
system configuration to determine all of the possible sources of energy. In addition, allow
5 minutes for the DC bus capacitors, located on the ceiling of the cabinet, to discharge
after removing power.
152607 vii
Safety
General Safety Precautions
1. When installing the PV225S use only components recommended or sold by
Xantrex. Doing otherwise may result in a risk of fire, electric shock, injury to
persons, and will void the warranty.
2. Do not attempt to operate the PV225S if it has been dropped, or received more
than cosmetic damage during transport or shipping. If the PV225S is
damaged, or suspected to be damaged, see the Warranty section of this
manual.
3. To reduce the risk of electrical shock, lock-out and tag the PV225S before
attempting any maintenance, service, or cleaning.
Personal Safety
Follow these instructions to ensure your safety while working with the PV225S.
Safety Equipment
Authorized service personnel must be equipped with standard safety equipment
including the following:
• Safety glasses
• Ear protection
• Steel-toed safety boots
• Safety hard hats
• Padlocks and tags
• Appropriate meter to verify that the circuits are de-energized
(600 Vac and DC rated, minimum)
Check local safety regulations for other requirements.
Wiring Requirements
1. All wiring methods and materials shall be in accordance with the National
Electrical Code ANSI/NFPA 70. When sizing conductors and conduits
interfacing to the PV225S, both shall be in accordance with the National
Electric Code ANSI/NFPA 70, as well as all state and local code
requirements.
2. Use copper conductors only with insulation rated for 90 °C.
3. The PV225S has a three-phase output. It is marked with this symbol:
4. The AC power conductor wiring interfacing with the AC terminals in the
Transformer Enclosure are located at T6-X1, T6-X2, and T6-X3. These
terminals should be tightened to a torque value of 420 in-lb (47.5 Nm).
Conductors terminated to these terminals must use a crimp-on type ring
viii 152607
Safety
terminal or compression lug. The terminals can accommodate up to two
conductors per phase. See the PV225S 225 kW Grid-tied Photovoltaic Inverter
Planning and Installation Manual for the location of these terminals.
5. The AC power conductor wiring interfacing with the AC terminals in the
Main Inverter Enclosure are located at TB5, TB6, and TB7. These terminals
are to be tightened to a torque value of 375 in-lb (42.4 Nm). The terminals
will accept a conductor size of 350 kcmil and can accommodate up to six
conductors per phase. See Figure 5-1 on page 5–4 for the location of these
terminals.
6. The AC power conductor wiring interfacing with the AC terminals in the
AC Interface Enclosure are located at S1-2T1, S1-4T2, and S1-6T3. These
terminals should be tightened to a torque value of 310 in-lb (35.0 Nm). See
Figure 5-2 on page 5–4 for the location of these terminals. Also see the
cautionary note in the PV225S 225 kW Grid-tied Photovoltaic Inverter
Planning and Installation Manual regarding hardware length.
7. The AC neutral conductor from the utility is terminated in the AC Interface
Enclosure at the TB11 terminal. This terminal requires the use of a crimp-on
type ring terminal or compression-type lug and should be tightened to a
torque value of 228 in-lb (25.7 Nm). See Figure 5-2 on page 5–4 for the
location of these terminals.
8. The DC power conductor wiring interfacing with the DC terminals at S2-6,
K2-6T3, and TB4 are to be tightened to a torque value of 600 in-lbs
(67.8 Nm). These terminals will accept a conductor size of 600 kcmil, and
can accommodate up to four conductors per pole at S2-6 and K2-6T3 and up
to two conductors at TB4. Keep these cables together as much as possible and
ensure that both cables pass through the same knockout and conduit fittings,
thus allowing any inductive currents to cancel. See Figure 5-3 on page 5–5 for
the location of these terminals.
9. This product is intended to be installed as part of a permanently grounded
electrical system per the National Electric Code ANSI/NFPA 70. A copper
ground rod must be installed within three feet of the PV225S enclosure. This
is the single point earth ground for the inverter system. The single point
ground for the system is to be made at the AC ground bus bar (TB12) in the
AC Interface Enclosure. This terminal requires the use of a crimp-on type ring
terminal or compression-type lug and should be tightened to a torque value of
420 in-lb (47.5 Nm).
10. The equipment grounds on the PV225S is marked with this symbol:
11. AC overcurrent protection for the utility interconnect (Grid-tie) must be
provided by the installers as part of the PV225S installation.
CAUTION: Fire Hazard
In accordance with the National Electrical Code, ANSI/NFPA 70, connect only to a circuit
provided with 400 amperes maximum branch circuit overcurrent protection for the
PV225S.
152607 ix
Safety
Operational Safety Procedures
Never work alone when servicing this equipment. A team of two is required until
the equipment is properly de-energized, locked-out and tagged, and verified deenergized with a meter.
Thoroughly inspect the equipment prior to energizing. Verify that no tools or
equipment have inadvertently been left behind.
Lockout and Tag
Safety requirements mandate that this equipment not be serviced while energized.
Power sources for the PV225S must be locked-out and tagged prior to servicing.
Each energy source should have a padlock and tag installed on each energy source
prior to servicing.
WARNING: Shock Hazard
Review the system schematic for the installation to verify that all available energy sources
are de-energized. DC bus voltage may also be present. Be sure to wait the full 5 minutes to
allow the capacitors to discharge completely.
The PV225S can be energized from both the AC source and the DC source. To
ensure that the inverter is de-energized prior to servicing, lockout and tag the
PV225S using the following procedure.
1. Open, lockout, and tag the incoming power at the utility main circuit breaker.
2. Open, lockout, and tag the AC Disconnect Switch (S1) on AC interface
assembly. See Figure 1-8 on page 1–12 for the location of the AC Disconnect
Switch.
3. Open, lockout, and tag the DC Disconnect Switch (S2) on DC interface
assembly. See Figure 1-8 on page 1–12 for the location of the DC Disconnect
Switch.
4. Using a confirmed, accurate meter, verify all power to the inverter is deenergized. A confirmed, accurate meter must be verified on a known voltage
before use. Ensure that all incoming energy sources are de-energized by
checking the following locations.
a) Inverter Terminals: TB5, TB6, TB7 (Phase A, B, C)
See Figure 5-1 on page 5–4.
b) Utility Terminals: Top of S1-2T1, S1-4T2, S1-6T3
See Figure 5-2 on page 5–4.
c) PV Terminals: Bottom of S2-6, K2-6T3, TB4 (PV+, PV-, GND)
See Figure 5-3 on page 5–5.
x 152607
De-Energize/Isolation Procedure
The following procedure should be followed to de-energize the PV225S for
maintenance.
WARNING
The terminals of the DC input may be energized if the PV arrays are energized. In
addition, allow 5 minutes for all capacitors within the main enclosure to discharge after
disconnecting the PV225S from AC and DC sources.
To isolate the PV225S:
1. Turn the O
2. Open the DC Disconnect Switch.
3. Open the AC Disconnect Switch.
4. Open the utility connection circuit breaker.
5. Install lockout devices on the utility connection circuit breaker and DC
Disconnect Switch.
N/OFF switch to the OFF position.
Safety
Interconnection Standards Compliance
The PV225S has been tested and listed by Underwriters Laboratories to be in
compliance with UL 1741 Static Inverters And Charge Controllers For Use In
Photovoltaic Power Systems, as well as IEEE-929-2000 Recommended Practice
For Utility Interface of Photovoltaic (PV) Systems.
IEEE-929-2000 provides guidance regarding equipment and functions necessary
to ensure compatible operation of photovoltaic systems which are connected in
parallel with the electric utility.
UL1741 is the standard applied by Underwriters Laboratory to the PV225S to
verify it meets the recommendations of IEEE-929-2000.
Refer to both documents for details of these recommendations and test
procedures.
152607 xi
xii
Contents
Important Safety Instructions
1
Introduction
Operation Features- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–2
Fixed Unity Power Factor Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–2
Peak Power Tracking - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–3
Dynamic DC Minimum Operating Voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–4
Utility Voltage/Frequency Fault Automatic Reset - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–4
Safety Features - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–5
Anti-Island Protection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–5
PV Ground Fault Detection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–5
DC Over-voltage Detection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–5
Physical Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–6
Main Inverter Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–7
Power Distribution Panel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–7
Converter Control Unit (CCU2) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–7
Power Electronics Matrices - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–7
Inductor Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–7
DC Interface Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–8
Transformer Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–8
AC Interface Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–8
Communications Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–9
Operator Interface Controls- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–10
Main Enclosure Door Interlock Switch - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–10
On/Off Switch - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–11
AC and DC Disconnect Switches - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–12
Communication Features - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–12
System Status and Fault Reporting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–13
Data Logging - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–13
Communication Methods - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–14
Universal Front Panel Control Unit (UFCU) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–14
PC Connection Methods - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–15
POTS Access - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–16
Wireless Access - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–16
Ethernet LAN Access - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–17
Direct Access - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–17
GUI Software Features - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–18
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - vii
152607 xiii
Contents
2
Operation
Description of System Operation- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–2
Overview - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–2
Faults - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–2
Operating States- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–4
Power Tracking - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–4
Transition - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–4
Shutdown - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–5
Fault - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–5
Manual Current - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–5
Matrix Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–5
Automatic Sleep Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–5
Operator Interface- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–6
UFCU Keypad Operation and LCD Display - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–6
LCD Display - Initialization Screen - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–7
Standard Display - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–7
Menu Structure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–8
Read Menu - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–9
Write Menu - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–15
Commanding Goal State Changes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–20
Setting the Date and Time - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–21
Manual State Transitions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–22
Automatic State Transitions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–22
Auto-restart Feature - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–23
Energize Procedure (Startup) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–24
Computer Communications with the PV225S - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–25
Installing the Graphic User Interface (GUI) Software - - - - - - - - - - - - - - - - - - - - - - - - - - -2–26
Minimum System Requirements - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–26
Starting the Software Setup Program - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–26
Starting the Setup Program Using Autorun - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–26
Starting Setup Manually - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–26
Starting Setup From a Command Prompt - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–27
Model Specific Software Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–28
Running the GUI - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–31
Remote/LAN Connection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–31
Direct Connection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–32
GUI Configuration - Adding Inverters - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–33
GUI Help - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–37
xiv 152607
3
Commissioning
Commissioning Procedure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–2
Starting the Commissioning Test File - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–2
Serial Number - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–3
Verify AC Voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–3
Verify DC Voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–3
Inspect Inductor Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–4
Apply Grid Voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–4
Front Panel Display - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–4
Establish Communications with the GUI - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–5
Confirm AC Operational Parameters - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–5
Confirm DC Operational Parameters - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–6
Confirm Power Tracker Configuration Operational Parameters - - - - - - - - - - - - - - - - - - - - - 3–6
Verify Door Interlock Functions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–6
Matrix Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–6
Operate Inverter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–7
Completed Commissioning - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3–7
4
Troubleshooting
Contents
Faults and Fault Codes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4–2
General Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4–2
Clearing Faults Manually - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4–3
Fault Code Descriptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4–4
5
Preventative Maintenance
Maintenance Safety - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–2
Operational Safety Procedures - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–2
De-Energize/Isolation Procedure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–2
Lockout and Tag - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–3
Periodic Maintenance- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–6
Monthly Intervals or As Required - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–6
Aluminum Extrusion Heatsinks - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–6
Fan Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–6
Internal Circulation Fan - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–6
Inductor Enclosure Cooling Fans - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–6
Six-month Intervals - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–7
Enclosure Seals - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–7
Electrical Connections - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–7
Inductor Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–7
152607 xv
Contents
A
Specifications
System Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - A–2
Environmental Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - A–2
Electrical Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - A–3
Over Voltage, Under Voltage and Frequency Ranges - - - - - - - - - - - - - - - - - - - - - - - - - - - A–3
Wire Gauge and Torque Requirements - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - A–4
Warranty and Product Information
Index
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - IX–1
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - WA–1
xvi 152607
Figures
Figure 1-1 Maximum Peak Power Tracking - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–4
Figure 1-2 PV225S Major Components - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–6
Figure 1-3 DC Interface Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–8
Figure 1-4 AC Interface Enclosure and Transformer Enclosure - - - - - - - - - - - - - - - - - - - - - - - - - 1–9
Figure 1-5 PC Connections in the Communications Enclosure- - - - - - - - - - - - - - - - - - - - - - - - - - 1–9
Figure 1-6 PV225S Operator Interface Components- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–10
Figure 1-7 On/Off Switch (S3) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–11
Figure 1-8 AC and DC Disconnect Switches- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–12
Figure 1-9 LCD Display and UFCU Location - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–14
Figure 1-10 PC Connections in the Communications Enclosure- - - - - - - - - - - - - - - - - - - - - - - - - 1–15
Figure 1-11 POTS Access - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–16
Figure 1-12 Wireless Access - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–16
Figure 1-13 LAN Access- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–17
Figure 1-14 Direct Access - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–17
Figure 2-1 Operating States Flow Chart - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–3
Figure 2-2 The Universal Front Panel Control Unit (UFCU) and LCD - - - - - - - - - - - - - - - - - - - - 2–6
Figure 2-3 Initialization Screens - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–7
Figure 2-4 Operator Interface Menu Diagram - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–8
Figure 2-5 Scrolling through the Read Menu - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–10
Figure 2-6 Read-by-ID Feature- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–13
Figure 2-7 State Transition Diagram - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–20
Figure 2-8 LCD showing Fault Code - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–23
Figure 2-9 GUI Interface Main Menu Screen - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–25
Figure 2-10 Staring Setup from a Command Prompt - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–27
Figure 2-11 GUI Splash Screen - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–28
Figure 2-12 GUI Setup Welcome Window - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–28
Figure 2-13 GUI Setup Start Window - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–29
Figure 2-14 GUI Setup Program Group Window- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–29
Figure 2-15 GUI Setup Progress Indicator Window - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–30
Figure 2-16 GUI Setup Start Window - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–30
Figure 2-17 GUI Interface Screen if Connected Remotely - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–31
Figure 2-18 GUI Interface Screen if Connected Directly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–32
Figure 2-19 Detail Screen - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–33
Figure 2-20 Contact Screen - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–33
Figure 2-21 Operational Configuration Screen - Limits - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–34
Figure 2-22 Operational Configuration Screen - PV- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–34
Figure 2-23 Operational Configuration Screen - Power Tracker - - - - - - - - - - - - - - - - - - - - - - - - - 2–35
152607 xvii
Figures
Figure 2-24 Connection Configuration Screen - General - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–35
Figure 2-25 Connection Configuration Screen - Telephone Fault Configuration - - - - - - - - - - - - - -2–36
Figure 2-26 Connection Configuration Screen - General - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–36
Figure 2-27 GUI Interface Screen if Connected Directly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2–37
Figure 4-1 LCD showing Fault Code - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4–3
Figure 5-1 Inverter AC Terminal Locations in the Main Inverter Enclosure - - - - - - - - - - - - - - - - 5–4
Figure 5-2 Utility AC Terminal Connections in the AC Interface Enclosure - - - - - - - - - - - - - - - - 5–4
Figure 5-3 PV Terminal Locations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5–5
Figure A-1 Electrical Diagram (sample)- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - A–5
Figure A-2 PV225S Schematic for Main Power Distribution (152812 A1) - - - - - - - - - - - - - - - - - A–6
Figure A-3 PV225S Schematic for Control Power Distribution (152812 A2) - - - - - - - - - - - - - - - A–7
Figure A-4 PV225S Schematic for Converter Control Unit (152812 A3)- - - - - - - - - - - - - - - - - - - A–8
xviii 152607
Tables
Table 2-1 Scrolling through the Read Menu Parameters - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–9
Table 2-2 Read Menu Descriptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–11
Table 2-3 Data Logging Menu- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–14
Table 2-4 Accumulated Values Menu- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–14
Table 2-5 Write Menu Parameters - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2–16
Table 4-1 Fault Codes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4–4
Table A-1 Environmental Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -A–2
Table A-2 Electrical Specifications- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -A–3
Table A-3 Over/Under Voltage and Over/Under Frequency Ranges - - - - - - - - - - - - - - - - - - - - - -A–3
Table A-4 AC Terminal Wire Gauge, Bolt Size, and Torque Values - - - - - - - - - - - - - - - - - - - - -A–4
Table A-5 DC Terminal Wire Gauge, Bolt Size, and Torque Values - - - - - - - - - - - - - - - - - - - - -A–4
152607 xix
xx
1
Introduction
Chapter 1, “Introduction” contains information about the features and
functions of the PV225S 225 kW Grid-Tied Photovoltaic Inverter.
Introduction
Operation Features
The PV225S 225 kW Grid-Tied Photovoltaic Inverter is a UL 1741 listed, utility
interactive, three-phase power conversion system for grid-connected photovoltaic
arrays with a power rating of 225 kW. Designed to be easy to install and operate,
the PV225S automates start-up, shutdown, and fault detection scenarios. With
user-definable power tracking that matches the inverter to the array and adjustable
delay periods, users are able to customize startup and shutdown sequences.
Multiple PV225S inverters are easily paralleled for larger power installations.
The PV225S power conversion system consists of a pulse-width modulated
(PWM) inverter, switch gear for isolation and protection of the connected AC and
DC power sources, and a high efficiency custom Wye:Wye isolation transformer.
Housed in a rugged NEMA-3R rated, powder-coated steel enclosure, the PV225S
incorporates sophisticated Intellimod
(IGBT’s) as the main power switching devices. An advanced, field-proven,
Maximum Peak Power Tracker (MPPT) integrated within the PV225S control
firmware ensures the optimum power throughput for harvesting energy from the
photovoltaic array.
The advanced design of the PV225S includes an EMI output filter and the main
AC contactor located electrically on the utility side of the isolation transformer.
The location of the main AC contactor, and the ability to de-energize the isolation
transformer during times of non-operation, greatly reduces the night-time tare
losses consumed by an idle isolation transformer. An integrated soft-start circuit
precludes nuisance utility-tie circuit breaker trips as the result of isolation
transformer inrush current.
®
(IPM) Insulated Gate Bipolar Transistors
Additionally, the PV225S integrated controller contains self-protection features
including over and under voltage and frequency safeguards. An integral
anti-island protection scheme prevents the inverter from feeding power to the grid
in the event of a utility outage.
The PV225S includes a local user interface comprised of an O
keypad, and 4-line, 80 character LCD display. A user-friendly Graphic User
Interface (GUI) provides a remote interface for operator interrogation of PV225S
system status, control, metering/data logging and protective functions within the
PV225S. The status, control, and logging features are also supported by the choice
of three communication mediums, allowing the information to be accessed or
commanded remotely.
N/OFF switch,
Fixed Unity Power Factor Operation
The Xantrex PV Series of grid-tied inverters maintains unity power factor during
operation. The control software constantly senses utility voltage, and constructs
the output current waveform to match the utility voltage. The PV line of inverters
is not capable of operation without the presence of normal utility voltage, nor is it
capable of varying the output power factor off unity.
1–2 152607
Peak Power Tracking
An advanced, field-proven, Maximum Peak Power Tracker (MPPT) algorithm
integrated within the PV225S control software ensures the optimum power
throughput for harvesting energy from the photovoltaic array. The peak power
voltage point of a PV array can vary, primarily depending upon solar irradiance
and surface temperature of the PV panels. This peak power voltage point is
somewhat volatile, and can easily move along the I-V curve of the PV array every
few seconds. The MPPT algorithm allows the PV225S to constantly seek the
optimum voltage and current operating points of the PV array, and maintain the
maximum peak PV output power.
Accessible via the UFCU, there are five user settable parameters that control the
behavior of the maximum peak power tracker within the PV225S. As show in
Figure 1-1 on page 1–4, user settable parameters include:
• PPT V Ref (ID# 37),
• I PPT Max (ID#42),
• PPT Enable (ID# 44),
• PPT Rate (ID# 45), and
• PPT V Step (ID# 46).
Operation Features
Upon entering the Power Tracking mode, it takes approximately 20 seconds for
the PV225S to ramp the PV voltage to the “PPT V Ref” setpoint regardless of the
actual PV voltage.
With the “PPT Enable” set to “0” (power tracker disabled), the PV225S will
regulate the DC Bus at the “PPT V Ref” setpoint. Regulating the DC bus means
drawing more or less current out of the PV array to maintain this desired voltage.
With the “PPT Enable” set to “1” (power tracker enabled), followed by the
expiration of the “PPT Rate” (MPPT decision frequency), the MPPT will reduce
the reference voltage by an amount equal to the “PPT V Step” value.
At this point the MPPT will compare the amount of AC output power produced to
the previous amount of AC power produced by the PV225S. If the output power
has increased, the next change made (after “PPT Rate” has again expired) to the
reference voltage, will be in the same direction.
Conversely, if the power comparison proves undesirable, the power tracker will
reverse the direction of the change to the “PPT_V Step”. The MPPT algorithm
within the PV225S will then continue this ongoing process of “stepping and
comparing” in order to seek the maximum power throughput from the PV array.
The changes made by the MPPT to the reference voltage are restricted to ± 20% of
“PPT V Ref” and by the maximum and minimum PV input voltage (600 and
300 volts respectively). Also, the MPPT will not attempt to produce power greater
than that allowed by the “I PPT Max” setpoint. If available PV power is above the
maximum allowable power level of the PV225S, the MPPT will increase voltage
as needed to maintain output power below rated maximum.
152607 1–3
Introduction
Optimization of the PV225S MPPT will result in an increase in energy production.
The user is encouraged to study the PV array’s I-V curves and to adjust the MPPT
user settable parameters accordingly.
Figure 1-1
Maximum Peak Power Tracking
Dynamic DC Minimum Operating Voltage
The PV225S employs a unique approach to the minimum DC input voltage for
operation. The CCU2 constantly monitors and calculates an average of the AC
utility input voltage, thereby adjusting the required minimum DC input voltage
threshold to optimize the sinusoidal AC output current waveform. Given a
nominal input voltage of 208 Vac, the minimum DC input voltage threshold is
300 Vdc. On a transient basis, the PV225S does have the ability to adjust the
minimum DC input voltage threshold to less than 300 Vdc.
Utility Voltage/Frequency Fault Automatic Reset
In the event of a utility voltage or frequency excursion outside of preset limits, the
PV225S will stop operation and display a fault at the operator interface. Once the
utility voltage has stabilized within acceptable limits for a period of at least
5 minutes, the PV225S will automatically clear the fault and resume normal
operation. Voltage and frequency fault setpoints are detailed later in this section.
1–4 152607
Safety Features
Anti-Island Protection
A condition referred to as "Islanding" occurs when a distributed generation source
(such as the PV225S Grid-tied Photovoltaic Inverter) continues to energize a
portion of the utility grid after the utility experiences an interruption in service.
This type of condition may compromise personnel safety, restoration of service,
and equipment reliability.
The PV225S employs a method for detecting the islanding condition using a
Phase-Shift-Loop (PSL). This method is implemented in the CCU2 to prevent
islanding of the PV225S. The CCU2 continuously makes minor adjustments to
the power factor phase angle above and below unity. In the event of a utility
interruption or outage, these adjustments destabilize the feedback between the
inverter and the remaining load, resulting in an over/under frequency or voltage
condition.
Upon detection of such a condition, the PV225S then performs an immediate
orderly shutdown and opens both the main AC and DC contactors. The fault
condition will remain latched until the utility voltage and frequency have returned
to normal for at least 5 minutes.
This method has been extensively tested and proven to exceed the requirements of
IEEE-929 (Recommended Practices for Utility Interface of Photovoltaic [PV]
Systems) and UL-1741 (Static Inverters and Converters for use in Independent
Power Systems).
Safety Features
PV Ground Fault Detection
The PV225S is equipped with a ground fault detection circuit by means of a
Hall-effect current transducer (CT8). This circuit is active when the PV array is
properly grounded. In the event of a ground fault exceeding 10 amps DC, the
PV225S will execute an immediate orderly shutdown, open both the main AC and
DC contactors, and report a ground fault on the LCD of the UFCU. The PV225S
will remain faulted until the ground fault is remedied and the advisory is cleared at
the operator interface.
For additional information, see Chapter 4, “Troubleshooting”.
DC Over-voltage Detection
In the event of DC voltage greater than 600 Vdc, the PV225S will execute an
orderly shutdown and will report a fault to the operator interface. If DC voltage
remains greater than 600 Vdc, the PV225S may be irreparably damaged.
See Chapter 4, “Troubleshooting” for further information on this fault condition.
152607 1–5
Introduction
Physical Characteristics
The PV225S comes in two modules comprised of six enclosures to house the
electronics described above. The first module includes the Main Inverter
Enclosure, Inductor Enclosure, DC Interface Enclosure, and Communications
Enclosure. The second module includes the Transformer Enclosure and AC
Interface Enclosure.
These components are identified in Figure 1-2.
Power Electronics
Communications
Enclosure
AC Interface
Enclosure
Figure 1-2
Main Inverter
Enclosure
DC Interface
Enclosure
Transformer
Enclosure
Inductor
Enclosure
PV225S Major Components
1–6 152607
Main Inverter Enclosure
The PV225S Main Inverter Enclosure is NEMA-3R rated and contains the power
distribution panel, the converter control unit (CCU2), and the power electronics
matrices. Also found within the Main Inverter Enclosure are some of the system
protection devices (such as the sense and control power fuses).
Power Distribution Panel
This panel contains many of the Electromechanical, protective, and control power
components necessary to support the operation of the PV225S.
Converter Control Unit (CCU2)
The CCU2 is a Digital Signal Processor (DSP) based control board that performs
numerous control and diagnostic functions associated with PV225S operation. Its
most significant tasks are control of PV225S electromechanical components and
power electronics converters, signal conditioning for high voltage signal inputs
and communication with the Universal Front Panel Control Unit, and system
sensors. The CCU2 also contains the necessary DC power supplies to support its
operation.
Physical Characteristics
Power Electronics Matrices
The power electronics converters are located at the top of the PV225S main
inverter enclosure. Both the left and right matrices are comprised of six switching
transistors (IGBTs), transistor gate drive electronics, a laminated power bus, DC
capacitor bank, and an aluminum extrusion heatsink with a cooling fan. The fans
are located above each matrix heatsink.
The PV array is tied logically to the matrices DC bus within the DC interface
enclosure. The embedded CCU2 control unit manages the transfer of power
between the DC bus and the utility grid by sending digitized gating signals to the
IGBTs for producing a high-fidelity, sinusoidal output.
Inductor Enclosure
The Inductor Enclosure is NEMA-3R rated. It contains the necessary filter
components to ensure the PV225S line current meets IEEE-519 (1992, Standard
Practices and Requirements for Harmonic Control in Electrical Power Systems)
and UL 1741 (2001, Static Inverters and Converters for use in Independent Power
Systems) harmonic distortion requirements. Mounted on both the right and left
side of the lower enclosure are inductor fans to allow cooling of the line filter
components within. This enclosure also serves as the mounting base for the
PV225S Main Enclosure.
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Introduction
DC Interface Enclosure
The DC Interface Enclosure is NEMA-3R rated. The DC interface serves as the
connection interface between the PV array and the PV225S. This enclosure is
where the DC Disconnect Switch and DC contactor reside.
CAUTION: Equipment Damage
The fuses within the PV225S are intended for protecting the PV225S control circuitry
only. They are not intended to provide protection for the PV array or external cabling.
DC Disconnect Switch
DC Interface Enclosure
Figure 1-3
DC Interface Enclosure
Transformer Enclosure
The Transformer Enclosure is NEMA-3R rated. The main isolation transformer
inside electrically isolates the PV225S from the utility power. Voltage-sensing
circuit wiring and soft-start circuit pass through the Transformer Enclosure from
the AC Interface Enclosure to the Main Inverter Enclosure.
AC Interface Enclosure
The AC Interface Enclosure is NEMA-3R rated. The AC interface serves as the
connection between the utility and the isolation transformer. This enclosure is
where the AC line fuses and AC Disconnect Switch reside. Also included in the
AC Interface Enclosure are the main AC contactor and transformer soft-start
circuit.
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