User manual CONTAX SWI INSTALLATION REV B

[. . . ] Installation Guide Cable SWI Stacking Interface Cable for SW and PS Series Inverters 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 Stacking Interface Cable Installation Guide © October 2001 Xantrex International. [. . . ] · 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. Inverter 1 (L1) Positive Tie Negative Tie + ­ Series Stacking Cable (SWI) NOTE: Series Stacking Cable connects on AC side for SW inverters DC Disconnect + ­ + ­ + ­ Inverter 2 (L2) Chassis Ground + ­ + ­ DC Ground Figure 2-3 Series Stacking Using One DC Disconnect (Block Diagram) © 2001 Xantrex Technology Inc. All Rights Reserved. P/N 975-0013-01-01 Rev B 10/01 9 2. 0 INSTALLATION 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. Inverter 1 (L1) + ­ Negative Tie DC Disconnect Series Stacking Cable (SWI) NOTE: Series Stacking Cable connects on AC side for SW inverters + DC Disconnect ­ + ­ + ­ Inverter 2 (L2) Chassis ground + ­ + ­ DC Ground Figure 2-4 Series Stacking Using Two DC Disconnects (Block Diagram) 10 © 2001 Xantrex Technology Inc. All Rights Reserved. P/N 975-0013-01-01 Rev B 10/01 2. 0 INSTALLATION 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. 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. [. . . ] Ensure the main service panel's circuit breakers feeding the inverters are OFF. Use an AC voltmeter and measure the voltage between the L1 terminal and neutral bus in the sub-panel. Measure the voltage between the L2 terminal and neutral bus in the sub-panel. Switch ON the main service panel's circuit breakers feeding the inverters. [. . . ]