Smart choice for power Installation Guide Inverter Stacking Control Series (ISC-S) Cable www.xantrex.
Inverter Stacking Control Series (ISC-S) Cable Installation Guide
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.
About This Guide Purpose The purpose of this Installation Guide is to provide explanations and procedures for installing the Inverter Stacking Control – Series Cable and provides information regarding stacking two identical Sine Wave Plus inverters. Scope The Guide provides safety guidelines, detailed planning and setup information for stacking inverters, and procedures for installing the ISC-S cable.
About This Guide Conventions Used The following conventions are used in this guide. WARNING Warnings identify conditions 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: These notes describe things which are important for you to know, but not as serious as a caution or warning.
Important Safety Instructions WARNING This chapter contains important safety and operating instructions. Read and keep this Installation Guide for future reference. 1. Before installing and using the ISC-S cable, read all instructions and cautionary information in this guide. 2. Do not expose the ISC-S cable to rain, snow, spray, or water. 3. Use only attachments recommended or sold by the manufacturer. Doing otherwise may result in a risk of fire, electric shock, or injury to persons. 4.
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Contents Important Safety Instructions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -v 1 Introduction Stacking Inverters - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–2 The ISC-S Cable - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1–5 2 Installation DC Wiring - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Figures Figure 1-1 Figure 1-2 Figure 1-3 Figure 2-1 Figure 2-2 Figure 2-3 Figure 2-4 Figure 2-5 Figure 2-6 Figure 2-7 Figure 2-8 Figure 2-9 Figure 2-10 Figure 3-1 Off-Grid Applications with Series-Stacked Inverters- - - - - - - - - - - - - - - - - - - - - - - - - 1–3 On-Grid Applications with Series-stacked Inverters - - - - - - - - - - - - - - - - - - - - - - - - - 1–4 Inverter Stacking Control – Series Cable (ISC-S cable) - - - - - - - - - - - - - - - - - - - - - - - 1–5 Example of Battery Connections fo
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1 Introduction Chapter 1, “Introduction” provides information on stacking of Sine Wave Plus inverters. The following topics are covered in this chapter.
Introduction Stacking Inverters Two identical, series-stacked, inverters can be connected together for the following purposes. • • The voltage output of a single inverter is insufficient to power the 240 Vac loads attached to the system; Multi-wire branch circuits exists in the current structure. Please see Appendix F, “Multi-wire Branch Circuit Wiring”, in the Sine Wave Plus Owner’s Manual for additional information. Important: Inverter types and models must be identical for stacking configurations.
Stacking Inverters Figure 1-1 Off-Grid Applications with Series-Stacked Inverters 975-0059-01-01 Rev A 1–3
Introduction Figure 1-2 On-Grid Applications with Series-stacked Inverters 1–4 975-0059-01-01 Rev A
The ISC-S Cable The ISC-S Cable Required accessory cable Stacking two identical inverters requires the use of the Inverter Stacking Control – Series Cable (ISC-S cable). The ISC-S cable is a special cable specifically designed for series-stacking two identical inverters. It consists of one 36-inch stacking control cable with two 25-pin D connectors. It connects to the “Stacking Ports” on the respective inverters and allows the AC output of two (identical) inverters to provide both 120 and 240 Vac, 60 Hz.
What it does The ISC-S cable provides communication between the two stacked inverters for two purposes. • • What it does not do 1–6 It provides synchronization information for inverting and charging. It provides a method for one inverter detecting an error condition to send a shutdown command to the other inverter, to prevent a 240Vac load from only receiving one leg of power. The ISC-S cable does not allow programming or access to the display from one inverter to the other.
2 Installation Chapter 2, “Installation” provides information on installing the DC wiring, AC Wiring, and the ISC-S for Sine Wave Plus inverters. The following topics are covered in this chapter.
Installation DC Wiring The success of series-stacked, inverter systems is dependent on the quality and maintenance of the DC connections. Stacked inverter sets are far less forgiving to long, undersized, uneven, and/or poor connections than are single inverters. Battery Requirements for Series-stacked Inverters When inverters are “stacked” they must operate from a common battery bank. In other words, the DC negative of one inverter must be common with the second inverter and likewise for the DC positive.
DC Wiring Grounding Series-stacked Inverters To ground series-stacked inverters: 1. Connect the ground bond in the DC disconnect between the inverters and the batteries to the primary grounding electrode, in accordance with local and national electrical codes. 2. Connect an appropriately sized ground wire from the chassis bonding ground lug on the L1 inverter DC end to the ground bond inside the DC disconnect. 3.
Installation Connecting the Battery Bank to the Inverters The following instructions are illustrated in Figure 2-3. To connect the battery (or battery bank) to the inverters: 1. Connect POSITIVE cables: a) one cable from the battery POSITIVE terminal to a circuit breaker in the DC disconnect (torque to manufacturer’s recommendations). The DC disconnect should be located as close to the batteries as possible.
DC Wiring – xantrex I nverter Contr ol M odul e + 01A Inverter OFF SRCH ON CHG INV GEN ON /O F F xantrex ME N U G R ID T IE IN V E R T ME N U HE A DN I GS S ine Wave P l us I nverter/ Charger ME N U IT E M S AC 1 BU L K E R R OR AC 2 F L OA T S T A T US SE T P OIN T S C o n tr a s t R ese D t e fa u lts L1 Inverter Chassis Bonding Ground Lug 2d – xantrex I nver ter Control Modul e + 01A Inverter OFF SRCH ON CHG INV GEN O N /O F F ME N U xantrex S i ne Wave P l us I nve rter/ C har
Installation AC Wiring - General Be sure to use the recommended wire and disconnect size as recommended in the Owner’s Manual for the Sine Wave Plus Inverter. WARNING Before connecting any AC wiring, ensure that there is no DC energy accessible by the inverter by opening the DC disconnect switch(es).
AC Wiring - General Neutral Bonding The HOT output of each inverter provides 120 Vac to neutral. The voltage between the HOT outputs from the L1 and L2 inverter is 240 Vac when the ISC-S cable is used. When using a series-stacked, inverter configuration, it is important to provide a neutral bond between both inverters. Accomplish this bond by establishing an inverter-to-inverter neutral bond.
Installation AC Wiring - Specific The following AC connections are specific to installing the Sine Wave Plus Inverter/chargers in a series-stacked configuration for off-grid and on-grid applications. Off-Grid AC Wiring for Sine Wave Plus Inverters The following steps are illustrated in Figure 2-4. Grounding To connect the AC wiring for an off-grid application using Sine Wave Plus Inverters: 1.
AC Wiring - Specific Sine Wave Plus Inverter/Charger LEGEND GROUND NEUTRAL HOT L1 INV OUT NEUTRAL OUT NEUTRAL 2 NEUTRAL 1 AC1 GRID AC GROUND BAR (inside) AC2 GEN AC TERMINAL BLOCK HOT L2 (L1) 1b 3a Sine Wave Plus Inverter/Charger 3b L1 INV OUT NEUTRAL OUT NEUTRAL 2 AC1 GRID AC Distribution Panel (Inverter Panel) 3a 120/240 Vac NEUTRAL 1 AC TERMINAL BLOCK AC GROUND BAR (inside) AC2 GEN 2b (L2) 1c L2 NEUTRAL 2c 3b 2a GROUND To AC Loads To AC Loads 1b 1c 1a To primary Earth
Installation On-Grid AC Wiring for Sine Wave Plus Inverters Prepare the AC wiring as follows for an on-grid application using series-stacked, Sine Wave Plus Inverter/chargers. The following steps are illustrated in Figure 2-5. Grounding 1.
AC Wiring - Specific Main Utility Panel LEGEND 120/240 Vac Panel GROUND L1 NEUTRAL L2 HOT L1 NEUTRAL HOT L2 Sine Wave Plus Inverter/Charger L1 2c L2 AC TERMINAL BLOCK 1b 1c 1d To primary Earth/ground connections INV OUT AC GROUND BAR (inside) AC1 GRID 1a 2a NEUTRAL OUT GROUND NEUTRAL 1 NEUTRAL 2 4b AC2 GEN 4a NEUTRAL/GROUND BOND 3a 4a 2b (L1) Sine Wave Plus Inverter/Charger 3a L1 INV OUT NEUTRAL OUT NEUTRAL 1 NEUTRAL 2 120/240 Vac AC GROUND BAR (inside) AC2 GEN AC Dis
Installation Generator AC Wiring to Series-stacked Inverters The following wiring diagrams show the AC wiring from an AC generator to the inverters. The following procedures are illustrated in Figure 2-6. Important: Ensure that an inverter-to-inverter neutral bond is in place before proceeding with this procedure. With a generator disconnect switch To install the AC wiring from a generator with a (GDS): 1.
AC Wiring - Specific Main Utility Panel LEGEND 120/240 Vac Panel GROUND L1 NEUTRAL L2 HOT L1 NEUTRAL NEUTRAL/GROUND BOND HOT L2 Sine Wave Plus Inverter/Charger L1 L2 GROUND To primary Earth/ground connections INV OUT NEUTRAL OUT NEUTRAL 2 NEUTRAL 1 AC1 GRID 1b AC2 GEN AC TERMINAL BLOCK AC GROUND BAR (inside) (L1) 2b 3b 4b Generator Disconnect Switch (optional) Generator 120/240 Vac N G L1 L2 Sine Wave Plus Inverter/Charger 1a 3a 4a 2a GROUND NEUTRAL L1 L2 GEN HOT OUT INV
Installation Wiring for a 240 Vac-Only Input Source A 240 Vac source does not allow for the connection to the input of a 120 Vac inverter as no neutral line is supplied from the utility or generator. 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.
AC Wiring - Specific LEGEND Sine Wave Plus Inverter/Charger GROUND NEUTRAL HOT L1 HOT L2 INV OUT 3b GROUND GEN HOT OUT (L1) 1d L1 1b NEUTRAL OUT (with center-tapped neutral-out) AC1 GRID AC GROUND BAR (inside) NEUTRAL 1 NEUTRAL 2 Auto-transformer AC2 GEN AC TERMINAL BLOCK L1 3a 2a Neutral L2 3d Generator 240 Vac - ONLY 3e L2 Ground 2c 3c 1c Sine Wave Plus Inverter/Charger 2b 120/240 Vac L2 (L2) INV OUT NEUTRAL OUT NEUTRAL 1 NEUTRAL 2 AC2 GEN 3f L1 AC TERMINAL BLOCK AC
Installation Connecting the ISC-S Cable The ISC-S Cable connects to the Stacking Port on the AC end of the Sine Wave Plus Inverter/charger. The Stacking Port is a 25-pin receptacle for the 25-pin D-connector on the ISC-S Cable. Once the connector is in place, it is secured by two screws on the sides of the connector. Align the head of the connector with the Stacking Port on the inverter and insert into the port. Gently tighten these two screws to secure in place.
Connecting the ISC-S Cable Connect one end of ISC-S Cable to the Stacking Port of the L1 inverter. Connect the other end of ISC-S Cable to the Stacking Port of the L2 inverter. Figure 2-10 The ISC-S Cable Connected to Dual Sine Wave Plus Inverters CAUTION; Damage to Loads Until the units are tested, do not connect any loads to the inverters. Proceed to the next chapter for Start up and Functional Testing Procedures.
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3 Operation Chapter 3, “Operation”contains information on startup and functional testing procedures for series-stacked Sine Wave Plus inverters. The following topics are covered in this chapter.
Operation Start-up and Testing Stacked inverters must operate together in order to provide the 120/240 Vac to the loads. The ISC-S cable ensures the output from each inverter is 180 degrees out-of-phase for operating 240 Vac loads. To start up and test the inverters: 1. Ensure the circuit breakers on all AC sources (utility or generator, if any) feeding the inverters are OFF. 2. Ensure the circuit breakers in the AC distribution panel (sub-panel) are OFF. 3. Switch ON both inverters.
Start-up and Testing LEGEND GROUND NEUTRAL HOT L1 HOT L2 AC Distribution Panel (Sub-panel) To L1 Inverter 120/240 Vac 6 L1 L2 NEUTRAL 4 5 To L2 Inverter To L2 Inverter To 120 Vac Loads GROUND To 240 Vac Loads To Main Utility Panel Ground Figure 3-1 Testpoints for Confirming Voltages 975-0059-01-01 Rev A 3–3
Operation Setting Changes When operating a Sine Wave Plus in a series-stacked configuration, the following settings must be changed for proper operation. See the Owner’s Manual for the Sine Wave Plus for detailed instructions on accessing and changing the settings using the Inverter Control Module (ICM) on the inverter.
Setting Changes Automatic Generator Equalize Charging If the inverters are set to automatically charge the batteries using the generator, the equalize process will begin during the next, automatically started, generator run period. When the equalizing process has completed, the generator automatically stops and the cursor returns to the OFF position in the 01B EQ CHARGE menu item on the generator-controlling inverter.
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Warranty and Return Information Warranty What does this warranty cover? This Limited Warranty is provided by Xantrex Technology, Inc. ("Xantrex") and covers defects in workmanship and materials in your Inverter Stacking Control – Series Cable. This warranty period lasts for two (2) years from the date of purchase at the point of sale to you, the original end user customer. You require proof of purchase to make warranty claims.
Warranty and Return What does this warranty not cover? This Limited Warranty does not cover normal wear and tear of the product or costs related to the removal, installation, or troubleshooting of the customer's electrical systems.
Warranty and Return Return Material Authorization Policy Before returning a product directly to Xantrex you must obtain a Return Material Authorization (RMA) number and the correct factory "Ship To" address. Products must also be shipped prepaid. Product shipments will be refused and returned at your expense if they are unauthorized, returned without an RMA number clearly marked on the outside of the shipping box, if they are shipped collect, or if they are shipped to the wrong location.
Warranty and Return Information About Your System As soon as you open your Inverter Stacking Control – Series Cable package, record the following information and be sure to keep your proof of purchase. ❐ Purchased From _________________________________ ❐ Purchase Date _________________________________ If you need to contact Customer Service, please record the following details before calling. This information will help our representatives give you better service.
Index Numerics 240 Vac-Only Input Source 2–14 A Abbreviations and Acronyms iv AC Wiring - General 2–6 AC Wiring - Specific 2–8 B Battery Requirements 2–2 Battery-Bank Configuration 2–2 Bulk and Float Charging Parameters 3–4 C Connecting the Battery Bank 2–4 Customer Service preparing to call WA–4 D DC Wiring 2–2 O Off-Grid AC Wiring 2–8 Off-Grid Applications with Series-Stacked Inverters 1–3 On-Grid AC Wiring 2–10 On-Grid Applications with Series-stacked Inverters 1–4 P proof of purchase WA–4
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