Xantrex Swi - installation rev b User manual

Installation GuideInstallation Guide

Installation Guide

SWI Stacking Interface CSWI Stacking Interface C

SWI Stacking Interface Cableable

ableable

able

for SW and PS Series Invertersfor SW and PS Series Inverters

for SW and PS Series Inverters

P/N 9 5-0013-01-01 Rev B 10/01

About Xantrex

Xantrex Technology Inc., is a world-leading supplier of advanced power electronics and controls with products

from 50-watt mobile units to 1 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

Xantrex is a registered trademark of Xantrex Technology Inc.

Notice of Copyright

Disclaimer

While every precaution has been taken to ensure the accuracy of the contents of this guide, Xantrex

International assumes no responsibility for errors or omissions. Note as well that specifications and product

functionality may change without notice.

Since the use of this manual and the conditions or methods of installation, operation, use and maintenance of

the unit are beyond the control of Xantrex Technology Inc., the company does not assume responsibility and

expressly disclaims liability for loss, damage, or expense arising out of or any way connected with such installation,

operation, use, or maintenance.

Due to continual improvement through product updates, photographs and/or illustrations used in this manual

may not

exactly

match your unit. Xantrex Technology Inc., reserves the right to update this product without notice or

releasing an updated manual when

fit, form or function

are not affected.

Date and Revision

October 2001, Revision B

Part Number

9 5-0013-01-019 5-0013-01-01

9 5-0013-01-01

Contact nformation

Web: www.xantrex.com

Email: [email protected]

Phone: 360/435.8826

Fax: 360/435.2229

P/N 975-0013-01-01 Rev B 10/01 iii

IMPORTANT SAFETY INSTRUCTIONS

This manual contains important safety instructions that should be followed during the installation and

maintenance of this product.

To reduce the risk of electrical shock, and to ensure the safe installation and operation of this product, the

following safety symbols have been placed throughout this manual to indicate dangerous conditions and important

safety instructions.

WARNING - A DANGEROUS VOLTAGE OR CONDITION EXISTS IN THIS AREA.

USE EXTREME CAUTION WHEN PERFORMING THESE TASKS.

AVERTISSEMENT - UNE TENSION OU CONDITION DANGEREUSE EXISTE DANS

CETTE ZONE. FAIRE PREUVE D’EXTRÊME PRUDENCE LORS DE LA RÉALISATION DE

CES TÂCHES.

CAUTION - This procedure is critical to the safe installation or operation of the unit.

Follow these instructions closely.

ATTENTION - Cette procédure est essentielle à l’installation ou l’utilisation de l’unité en

toute sécurité. Suivre ces instructions de près.

NOTE - This statement is important. Follow instructions closely.

NOTE - Cette déclaration est importante. Suivre les instructions de près.

•All electrical work must be done in accordance with local, national, and/or international electrical codes.

•Before installing or using this device, read all instructions and cautionary markings located in the manual, and

on the inverter, the batteries, and the PV array.

•Do not expose this unit to rain, snow or liquids of any type. This product is designed only for indoor mounting.

•To reduce the chance of short-circuits when installing or working with the inverter, the batteries, or the PV

array, use insulated tools.

•Remove all jewelry while installing this system. This will greatly reduce the chance of accidental exposure to

live circuits.

•The inverter contains more than one live circuit (batteries and AC line). Power may be present at more than

one source.

•This product contains no user-serviceable parts. Do not attempt to repair this unit.

•Do not install 120 volt AC stand-alone inverters onto 120/240 volt AC multi-branch circuit wiring. This could

pose a fire hazard due to an overloaded neutral return wire in this configuration.

•When stacking inverters, always connect the chassis of each inverter together using the chassis ground lug;

otherwise, a hazardous voltage may be present between each chassis.

P/N 9 5-0013-01-01 Rev B 10/01

BATTERY SAFETY NFORMAT ON

• Always wear eye protection, such as safety glasses, when working with batteries.

• Remove all loose jewelry before working with batteries.

• Never work alone. Have someone assist you with the installation or be close enough to come to your aid

when working with batteries.

• Always use proper lifting techniques when handling batteries.

• Always use identical types of batteries.

• Never install old or untested batteries. Check each battery’s date code or label to ensure age and type.

• Batteries are temperature sensitive. For optimum performance, they should be installed in a stable

temperature environment.

• Batteries should be installed in a well vented area to prevent the possible buildup of explosive gasses. If the

batteries are installed inside an enclosure, vent its highest point to the outdoors.

• When installing batteries, allow at least 1 inch of air space between batteries to promote cooling and

ventilation.

• NEVER smoke in the vicinity of a battery or generator.

• Always connect the batteries first, then connect the cables to the inverter. This will greatly reduce the chance

of spark in the vicinity of the batteries.

• Use insulated tools when working with batteries.

• When connecting batteries, always verify proper voltage and polarity.

• Do not short-circuit battery cables. Fire or explosion can occur.

• In the event of exposure to battery electrolyte, wash the area with soap and water. If acid enters the eyes,

flood them with running cold water for at least 15 minutes and get immediate medical attention.

• Always recycle old batteries. Contact your local recycling center for proper disposal information.

SAVE THESE INSTRUCTIONS

P/N 9 5-0013-01-01 Rev B 10/01 v

Contentsontents

ontentsontents

ontents

1.0 INTRODUCTION1.0 INTRODUCTION

1.0 INTRODUCTION ..................................................................................................................................................................................................................................................................................................

..................................................................................................................................................................................................................................................................................................

................................................................................................................................................. 11

SWI Stacking Interface Cable Kit ........................................................................................................................... 1

2.0 INST2.0 INST

2.0 INSTALLAALLA

ALLAALLA

ALLATIONTION

TIONTION

TION ........................................................................................................................................................................................................................................................................................................

....................................................................................................................................................

Series Stacking .......................................................................................................................................................

Series Stack DC Wiring (one disconnect device) .......................................................................................... 9

Series Stack DC Wiring (two disconnect devices) ...................................................................................... 10

Wiring with a Conduit Box............................................................................................................................ 11

Battery Connections for Stacked Inverters .................................................................................................. 11

Series Stacking AC Wiring ............................................................................................................................ 13

Input Wiring (SW Series) (Figure 2- ) ..................................................................................................... 13

Utility Input ............................................................................................................................................ 13

Generator Wiring ................................................................................................................................... 13

Input Wiring (PS Series) ........................................................................................................................... 15

Utility Input ............................................................................................................................................ 15

Output Wiring (SW Series)....................................................................................................................... 16

Output Wiring (PS Series) ........................................................................................................................ 1

240 VAC Only Source ................................................................................................................................ 18

3.0 OPERA3.0 OPERA

3.0 OPERATIONTION

TIONTION

....................................................................................................................................................... 1919

1919

Operating Stacked Inverters................................................................................................................................ 19

Start-up and Test........................................................................................................................................... 19

Settings ......................................................................................................................................................... 20

Automatic and Manual Generator Control .............................................................................................. 20

Bulk and Float Charging ........................................................................................................................ 20

Equalize Charging.................................................................................................................................. 20

Automatic Equalize Charging ............................................................................................................... 20

Manual Equalize Charging .................................................................................................................... 20

P/N 9 5-0013-01-01 Rev B 10/01 1

1.0 NTRODUCT ON

SW Stacking nterface Cable Kit

The SWI Stacking Interface Cable is an accessory for SW and PS Series inverters. This cable allows the AC

output of two (identical) inverters to be connected in a series configuration, providing both 120 and 240 VAC, 60 Hz

power for the loads. The AC input to the inverters is provided by the L1 and L2 legs of the utility grid (or 120/

240 VAC generator) with L1 connected to the input of one inverter and L2 connected to the corresponding input of

the other inverter (i.e., AC1 of both inverters).

Stacking is also an excellent choice for providing power to multi-wire branch circuits where stand alone

(120 VAC) inverters may require extensive rewiring within the building.

The SWI Stacking Interface Cable kit consists of:

• This Installation Guide

• One 42-inch stacking interface cable, complete with two 25-pin D connectors

CAUTION: Do not u e a tandard computer cable in place of the SWI tacking interface

cable.

Figure 1-1

Stacking nterface Cable

P/N 9 5-0013-01-01 Rev B 10/01

1.0 NTRODUCT ON

Notes:

P/N 9 5-0013-01-01 Rev B 10/01 7

2.0 NSTALLAT ON

Series Stacking

The STACKING port allows two SW or PS Series inverter/chargers to be used in the same system in a “SERIES”

configuration to operate 240 VAC loads. Series stacking can also be used to connect to 240 VAC only power systems

providing both 120 and 240 VAC outputs. A series stacking interface cable (SWI) is required to connect the series

stacking port of the inverters. In this mode, the inverters act independently of each other; however, their output is

phase locked and synchronized 180 degrees out-of-phase. Both units can independently charge the batteries or

provide battery backup power during a utility outage. 230 VAC/50 Hz units can not be stacked.

NOTE: se tape to label the inverters as INVERTER 1 (L1) and INVERTER 2 (L2), for future

reference.

Figure 2-1

PS Series DC nterconnect Cables and SW Series Stacking Cable

POSITIVE (+) RED TERMINAL

NEGATIVE (-) BLACK TERMINAL

POSITIVE (+) RED

INTERCONNECT CABLE

(not used in installations

with dual disconnects)

NEGATIVE (-) BLACK

INTERCONNECT CABLE

POSITIVE (+) RED TERMINAL

INVERTER 1 (L1)

INVERTER 2 (L2)

SWI SERIES STACKING

INTERFACE CABLE

PS STACKING PORT

2.0 INSTALLATION

P/N 975-0013-01-01 Rev B 10/01

Figure 2-2

SW Series Stacking Interface Cable

PowerConversionCenter

TRACE

ENGINEERING

TRACE

ENGINEERING

CONTRAST

LINE

ITEM

RESET TO

FACTORY

DEFAULTS

CONTROL PANEL

SET POINTS HEADINGS

MENU GEN

ON/OFF

Power Conversion Center

TRACE

ENGINEERING

TRACE

ENGINEERING

CONTRAST

LINE

ITEM

RESET TO

FACTORYDEFAULTS

CONTROL PANEL

SET POINTS

HEADINGS

MENU GEN

ON/OFF

Series Stacking (continued)

2.0 NSTALLAT ON

P/N 9 5-0013-01-01 Rev B 10/01 9

Series Stacking (continued)

The STACKING port allows two SW or PS Series inverter/chargers to be used in the same system in a “SERIES”

configuration to operate 240 VAC loads. Series stacking can also be used to connect to 240 VAC only power systems

providing both 120 and 240 VAC outputs. A series stacking interface cable (SWI) is required to connect the series

stacking port of the inverters. In this mode the inverters act independently of each other; however their output is

phase locked and synchronized 180 degrees out-of-phase. Both units can independently charge the batteries or

provide battery backup power during a utility outage. 230 VAC/50 Hz units can not be stacked.

NOTE: se tape to label the inverters as INVERTER 1 (L1) and INVERTER 2 (L2), for future

reference.

Series Stack DC Wiring (one disconnect device)

When stacking two inverters using one DC disconnect device, connect the units and batteries as follows:

• Tie the inverter’s negative terminals together using an appropriate length of cable (sized to fit).

• Connect one of the inverter’s negative terminals to the negative terminal of the battery bank.

• Tie the inverter’s positive terminals together using an appropriate length of cable (sized to fit).

• Connect one of the inverter’s positive terminals to the DC disconnect.

• Connect the DC disconnect to the positive terminal of the battery bank.

• Connect the Series Stacking Cable (SWI) to the STACKING port of both inverters.

• Connect the DC chassis ground lugs of both inverters together using a heavy gauge wire.

• Connect the negative end of the battery bank to a solid earth ground (refer to inverter installation manual).

NOTE: Connect the positive and negative wires to the batteries as show in the illustration

below. This ensures an even charge and discharge through the battery bank.

Figure 2-3

Series Stacking Using One DC Disconnect (Block Diagram)

Disconnect

Negative

Tie

Series Stacking

Cable (SWI)

+–+–

Positive

Tie

Inverter 1 (L1)

Inverter 2 (L2)

NOTE: Series Stacking

Cable connects on AC

side for SW inverters

–

DC Ground

Chassis Ground

2.0 INSTALLATION

P/N 975-0013-01-01 Rev B 10/01

Series Stacking (continued)

Series Stack DC Wiring (two disconnect devices)

When stacking two inverters using two DC disconnect devices, connect the units and batteries as follows (refer

to Figure 2-4):

•Tie the inverter’s negative terminals together using an appropriate length of cable (sized to fit).

•Connect a cable from the L1 inverter’s negative terminal to the negative terminal of the battery bank.

•Connect a cable from the L2 inverter’s negative terminal to the negative terminal of the battery bank.

•Connect a cable from the L1 inverter’s positive terminals to the DC disconnect.

•Connect a short cable from the DC disconnect to the positive terminal of the battery bank.

•Connect a cable from the L2 inverter’s positive terminal to the DC disconnect.

•Connect a short cable from the DC disconnect to the positive terminal of the battery bank.

•Connect the Series Stacking Cable (SWI) to the STACKING port of both inverters.

•Connect the inverter’s DC chassis ground lugs together using a heavy gauge wire.

NOTE: Connect the positive and negative wires to the batteries as show in the illustration

below. This ensures an even charge and discharge through the battery bank.

Figure 2-4

Series Stacking Using Two DC Disconnects (Block Diagram)

–

Series Stacking

Cable (SWI)

Inverter 1 (L1)

Inverter 2 (L2)

Disconnect

Negative

Tie

+–+–

Disconnect

NOTE: Series Stacking

Cable connects on AC

side for SW inverters

Chassis ground

DC Ground

2.0 INSTALLATION

P/N 975-0013-01-01 Rev B 10/01 11

Series Stacking (continued)

Wiring with a Conduit Box

When wiring a stacked pair of inverters using a conduit box, a longer DC cable must be supplied to connect the

negative terminals of the inverters together. This does not come with the kit and must be obtained separately. The

following illustration shows how the inverters are wired in a conduit box. This wiring arrangement is basically the

same as the previous illustration (Figure 2-Series Stacking (continued)

Battery Connections for Stacked Inverters

When using inverters in a stacked configuration, the same battery bank must be used for both inverters. To

ensure even charging of the batteries, each inverter must be connected to both strings (i.e., positive cable to string

2, and negative cable to string 1 for inverter L1; and positive cable to string 1 and negative cable to string 2 for

inverter L2) as shown in the diagram below. 4).

NOTE: SWCBs (SW Conduit Boxes) or PSCBs (PS Conduit Boxes) may be required to meet

code when stacking inverters.

Disconnects Negative

Tie

Series Stacking

Cable (SWI)

+–

DC Disconnect Box SWCB (or PSCB)

Conduit Box

SWCB (or PSCB)

Conduit Box

DC Negative

Block

+–

Batteries

Inverter 1

(L1)

Inverter 2

(L2)

DC Chassis

Earth Ground

NOTE: The Series Stacking Cable is

illustrated here to show it connects to

each inverter. Please refer to the

inverter's operator's manual for the

STACKING PORT location.

DC Chassis

Ground

Figure 2-5

DC Wiring using a DC Disconnect Box

2.0 INSTALLATION

P/N 975-0013-01-01 Rev B 10/01

Series Stacking (continued)

Battery Connections for Stacked Inverters (continued)

When using inverters in a stacked configuration, the same battery bank must be used for both inverters. To

ensure even charging of the batteries, each inverter must be connected to both strings (i.e., positive cable to string

2, and negative cable to string 1 for inverter L1; and positive cable to string 1 and negative cable to string 2 for

inverter L2) as shown in the diagram below.

Figure 2-6

Example of Battery Connections for Stacked Inverters

–

–+–+

+–

CONDUIT FOR

INVERTER 2

CONDUIT FOR

INVERTER 1

12 Volt

Battery 12 Volt

Battery

12 Volt

Battery 12 Volt

Battery

2.0 NSTALLAT ON

P/N 9 5-0013-01-01 Rev B 10/01 13

Series Stacking (continued)

Series Stacking AC Wiring

Series stacking is used in applications where either 240 volt loads (or a combination of both 240 and

120 volt loads) need to be powered from the inverters. One inverter, connected to the utility’s L1 line,

provides one 120 volt AC output and a second inverter connected to the utility’s L2 line provides the

second 120 volt AC output (180 degrees out-of-phase from the first inverter). The combined out-of-phase

voltages can power 240 volt AC loads as well as 120 volt loads, up to the power rating of the inverters.

nput Wiring (SW Series) (Figure 2-7)

Utility nput

• Connect a wire from the ground bus in the main service panel to the GROUND terminal in the L1

inverter. Connect a second ground wire from the L1 inverter’s AC GROUND terminal to the GROUND

terminal in the L2 inverter.

• Connect a wire from the neutral bus in the main service panel to the NEUTRAL IN terminal in the L1

inverter. Connect a second wire to the NEUTRAL OUT terminal and route this wire to the L2 inverter’s

NEUTRAL IN terminal. Keep this wire as short as possible.

• Connect a wire from the main service panel’s hot L1 line to the L1L1

L1L1

L1 inverter’s AC HOT IN 1 terminal.

• Connect a wire from the main service panel’s hot L2 line to the L2L2

L2L2

L2 inverter’s AC HOT IN 1 terminal.

Generator Wiring

• Connect a wire from the generator’s ground terminal to the AC GROUND terminal in the L1 (or L2)

inverter.

• Connect a wire from the generator’s neutral terminal to the NEUTRAL IN 2 terminal in the L1 (or L2

Inverter).

• Connect the generator’s hot wire (120 VAC) to the AC HOT IN 2 terminal in the L1L1

L1L1

L1 inverter.

If a 120/240 VAC generator is used in the system its hot (L2) output must be connected to the L2

inverter as follows:

• Connect a wire from the generator‘s L2 hot terminal to the AC HOT IN 2 terminal in the L2L2

L2L2

L2 inverter.

2.0 INSTALLATION

P/N 975-0013-01-01 Rev B 10/01

L1 L2 NEUTRAL

GROUND

240VAC

240 VAC

Main Utility

Breaker

Inverter

Disconnect

Breaker

NEUTRAL

GROUND

EarthGround

AC HOT OUT

NEUTRALOUT

NEUTRAL IN 2

NEUTRAL IN 1

AC HOT IN 2

AC HOT IN 1

AC HOT OUT

NEUTRALOUT

NEUTRAL IN 2

NEUTRAL IN 1

ACHOTIN2

ACHOTIN1

Chassis

AC GROUND

Terminal

SW INVERTER 1

(L1) SW INVERTER 2

(L2)

Chassis

AC GROUND

Terminal

NEUTRAL

To Generator Ground

To Generator Neutral

Generator Hot (to L1 for

120/240 VAC generators)

Generator Hot (to L2 for

120/240 VAC generators)

This line (L2) is for 120/

240 VAC generators only

GENERATOR

(OPTIONAL)

MAIN SERVICE PANEL

Figure 2-7

AC Input Wiring (SW Series Inverter)

Series Stacking (continued)

2.0 INSTALLATION

P/N 975-0013-01-01 Rev B 10/01 15

Series Stacking (continued)

Input Wiring (PS Series)

Utility Input

•Connect a wire from the ground bus in the service panel to the GROUND terminal in the L1 inverter.

Connect a second ground wire from the inverter’s AC GROUND terminal, to the GROUND terminal in

the L2 inverter.

•Connect a wire from the neutral bus in the main service panel to the NEUTRALIN terminal in the L1

inverter. Connect a second wire to the NEUTRAL OUT terminal and route this wire to the L2 inverter’s

NEUTRAL IN terminal. Keep this wire as short as possible.

•Connect a wire from the main service panel’s hot L1 line to the L1 inverter’s AC HOT INPUT terminal.

•Connect a wire from the main service panel’s hot L2 line to the L2 inverter’s AC HOT INPUT terminal.

L1 L2 NEUTRAL

GROUND

240 VAC

Main Utility

Breaker

Inverter

Disconnect

Breaker

NEUTRAL

GROUND

Earth Ground

AC HOT OUTPUT

NEUTRALOUTPUT

NEUTRALINPUT

AC HOT INPUT

AC HOT OUTPUT

NEUTRALOUTPUT

NEUTRALINPUT

AC HOT INPUT

MAIN SERVICE PANEL

PS INVERTER 1 (L1) PS INVERTER 2 (L2)

AC CHASSIS

GROUND

LUG

AC CHASSIS

GROUND

LUG

Figure 2-8

AC Input Wiring (PS Series Inverter)

2.0 NSTALLAT ON

P/N 9 5-0013-01-01 Rev B 10/01

L1 L2 NEUTRAL

GROUND

240 VAC

Deep Well Pump

120 VAC

Computer

Outlets/Security

240 VAC

Table Saw

Shop Power

240 VAC

120 VAC

240 VAC

Inverter

Disconnect

AC HOT OUT

NEUTRAL OUT

NEUTRAL IN 2

NEUTRAL IN 1

AC HOT IN 2

AC HOT IN 1

AC HOT OUT

NEUTRAL OUT

NEUTRAL IN 2

NEUTRAL IN 1

AC HOT IN 2

AC HOT IN 1

Chassis

AC GROUND

Terminal

SW INVERTER 1

(L1) SW INVERTER 2

(L2)

Chassis

AC GROUND

Terminal

NEUTRAL

GROUND SUB-PANEL

120 VAC

Refrigerator

Pellet Stove

Gas Heat Fan

Garage Doors

Series Stacking (continued)

Output Wiring (SW Series)

The output of each inverter provides 120 VAC. The voltage between the HOT outputs from the L1 and L2

inverter is 240 VAC.

• Connect a GROUND wire from the L1 (or L2) inverter’s AC GROUND lug to the sub-panel’s ground bus.

• Connect the NEUTRAL wire from the L1 (or L2) inverter’s NEUTRAL OUT terminal to the neutral bus in the

sub-panel.

• Connect the AC HOT OUTPUT (120 VAC) from the L1L1

L1L1

L1 inverter to the L1 terminal in the sub-panel.

• Connect the AC HOT OUTPUT (120 VAC) from the L2L2

L2L2

L2 inverter to the L2 terminal in the sub-panel.

WARNING: ENSURE THE ONLY NEUTRAL/GROUND BOND IS IN THE UTILITY

SERVICE PANEL. REMOVE ANY BONDING FROM THE SUB-PANEL IF IT IS PRESENT.

Figure 2-9

AC Output Wiring (SW Series nverters)

2.0 NSTALLAT ON

P/N 9 5-0013-01-01 Rev B 10/01 17

Series Stacking (continued)

Output Wiring (PS Series)

The output of each inverter provides 120 VAC. The voltage between the HOT outputs from the L1 and L2

inverter is 240 VAC.

• Connect a GROUND wire from the L1 inverter’s AC GROUND lug to the sub-panel’s ground bus.

• Connect a NEUTRAL wire from the L1 (or L2) inverter’s NEUTRAL OUTPUT to the neutral bus in the sub-

panel.

• Connect a wire from the HOT (120 VAC) output from the L1L1

L1L1

L1 inverter to the L1 terminal in the sub-panel.

• Connect a wire from the HOT (120 VAC) output from the L2L2

L2L2

L2 inverter to the L2 terminal in the sub-panel.

WARNING: ENSURE THE ONLY NEUTRAL/GROUND BOND IS IN THE UTILITY

SERVICE PANEL. REMOVE ANY BONDING FROM THE SUB-PANEL IF IT IS PRESENT.

L1 L2 NEUTRAL

GROUND

240 VAC

Deep Well Pump

120 VAC

Computer

Outlets Security

240 VAC

Table Saw

Shop Power

240 VAC

120 VAC

240 VAC

Main

Breaker

NEUTRAL

GROUND

SUB-PANEL

120 VAC

Refrigerator

Pellet Stove

Gas Heat Fan

Garage Doors

AC HOT OUTPUT

NEUTRAL OUTPUT

NEUTRAL INPUT

AC HOT INPUT

AC HOT OUTPUT

NEUTRAL OUTPUT

NEUTRAL INPUT

AC HOT INPUT

PS INVERTER 1

(L1) PS INVERTER 2

(L2)

Chassis

AC GROUND

Terminal

Chassis

AC GROUND

Terminal

Figure 2-10

AC Output Wiring (PS Series nverters)

2.0 NSTALLAT ON

P/N 9 5-0013-01-01 Rev B 10/01

Series Stacking (continued)

Main Service Panel

L1 L2

Utility L1

Neutral

Output L1

HOT

Utility L2

Neutral

Output L2

HOT

Stacking

Interface

Cable

HOT L1

HOT L2

240 VAC

120 VAC

All connections are made on

the inverter's AC terminal block.

The NEUTRAL wires together

at the inverter terminal block.

Figure 2-11

Series Stacked nverters AC Wiring

240 VAC Only Source

A 240 VAC source does not allow for the connection of 120 VAC input inverters as no neutral line is supplied

from the utility. In order to use stacked inverters, a neutral line must be added by using a center tapped

autotransformer (such as a T240) on the inverter’s input. This will create the necessary neutral return line for the

inverters, and half the voltage for each inverter to 120 VAC. The output of the inverter supplies both 120 and 240

VAC to the loads. A Trace Series Stacking cable (SWI) and autotransformer (capable of handling the systems power

requirements) are required in this configuration.

Wire the inverters as shown in the diagram below for 240 VAC only sources.

Utility L2

Neutral

Utility L1

Neutral N

HOT

Main Service Panel

240 VAC Only Service

Series

Stacking

Cable

120 VAC

240 VAC

HOT

ll Connections are

made on the inverter's

AC terminal blocks.

Output L1

Output L2

Tie Neutral wires

together at the inverter

terminal block.

Auto

Transformer

Figure 2-12

Series Stacked nverters Connected to a 240 VAC Only Source

WARNING: WHEN STACKING INVERTERS, ALWAYS CONNECT THE CHASSIS OF EACH

INVERTER TOGETHER USING THE CHASSIS GROUND LUG; OTHERWISE, A HAZ-

ARDOUS VOLTAGE MAY BE PRESENT BETWEEN EACH CHASSIS.

P/N 9 5-0013-01-01 Rev B 10/01 19

3.0 OPERAT ON

Operating Stacked nverters

Stacked inverters must operate together in order to provide the 120/240 VAC to the loads. The Series Stacking

Interface cable ensures the output from each inverter is 180 degrees out-of-phase for operating 240 VAC loads.

NOTE: ntil the units are tested, do no connect loads to the inverters 120 or 240 VAC output.

Start-up and Test

1. Ensure the main service panel’s circuit breakers feeding the inverters are OFF.

2. Switch ON both inverters. The inverter should be providing 120/240 VAC to the sub-panel.

3. Use an AC voltmeter and measure the voltage between the L1 terminal and neutral bus in the sub-panel.

This voltage should be 120 VAC (± 3%).

4. Measure the voltage between the L2 terminal and neutral bus in the sub-panel. This voltage should be 120

VAC (± 3%).

5. Measure the voltage between the L1 and L2 terminals in the sub-panel. This voltage should be 240 VAC (±

3%).

6. Switch ON the main service panel’s circuit breakers feeding the inverters.

. Verify the inverters are charging the batteries and powering the sub-panel (refer to the operator’s manual).

8. Switch both inverters OFF.

9. Replace all covers and panels on the inverters and sub-panel.

The stacked inverter system is now ready for use.

NOTE: If the inverters are not operating properly, please refer to the operator’s manual for

setup and troubleshooting information.

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