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AC Power
For Business-Critical Continuity™
® ™
Liebert Static Transfer Switch 2
User Manual–100-1000A, 50/60Hz
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TABLE OF CONTENTS IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 OVERVIEW OF MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 1.0 SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 2.0 UNPACKING AND INSPECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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7.0 INSTALLATION DRAWINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 8.0 INTRODUCTION TO LIEBERT STS2 OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57 8.1 System Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 8.1.1 Redundancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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12.0 COMMUNICATION INTERFACES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76 12.1 Using the RS-232 Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 12.1.1 Connecting and Using a Terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 12.1.2 Configuring the Liebert STS2 via the Terminal. . . . . . . . . . . . . . . . . . . . . . . . . .
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15.2 System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 15.2.1 Frame and Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 15.2.2 Casters, Leveling and Seismic Anchoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 15.2.3 Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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FIGURES Figure 1 Recommended derating for high altitude operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 2 Maximum ambient temperature for full load operation at higher altitudes. . . . . . . . . . . . . . . . . . 7 Figure 3 Typical static transfer switch one-line diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 4 Typical one-line diagram of two PDUs and a static transfer switch . . . . . . . . . . . . . .
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Figure 48 Liebert STS2 touch screen display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Figure 49 Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Figure 50 Keyboard and keypad displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Figure 51 Key lockout switch. . . . . . . .
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IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions that should be followed during the installation and maintenance of the Liebert Static Transfer Switch 2 (STS2). WARNING ! The unit is supplied by more than one power source. The unit contains hazardous voltages if any of the input sources are ON, even when the unit is in bypass. To isolate the unit, turn OFF and lock out ALL input power sources. Verify that all input power sources are de-energiz
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OVERVIEW OF MANUAL The Liebert STS2 Installation, Operation and Maintenance Manual is organized in a logical progres- sion so that you can follow the procedures, in the order provided to get your Liebert STS2 installed and running. Read the entire manual before proceeding with the unpacking and installation of the Liebert STS2. The major sections are as follows: Important Safety Instructions—review the instructions on the previous page before proceeding. Support Information—a blank table in whi
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Safety Precautions 1.0 SAFETY PRECAUTIONS Read this manual thoroughly before working with the static transfer switch. Be sure to review the warning under Important Safety Instructions on page 1. Refer to the Handling Considerations on page 5 before attempting to move the unit. Under typical operation and with the doors closed, only normal safety precautions are necessary. The area around the static transfer switch should be kept free from puddles of water, excess moisture and debris. The vent
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Unpacking and Inspections 2.0 UNPACKING AND INSPECTIONS NOTE Read the entire manual before installing and operating the unit. Upon receipt of the Liebert Static Transfer Switch2, the installer should perform the following steps to assure a high-quality installation. A high-quality installation begins on the receiving dock. The Liebert STS2 and its packaging should be inspected when the unit is delivered. If the packaging is not damaged, unpack the unit and conduct an internal inspection befo
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Unpacking and Inspections 2.2.1 Handling Considerations The static switch is bolted to a wooden shipping pallet to allow handling by forklift equipment or a pallet jack. Easily Moved — The unit is furnished with integral castors that allow the unit to be rolled into place after it has reached its location and is removed from the pallet. WARNING ! Exercise extreme care when handling static switch cabinets to avoid equipment damage or injury to personnel. The cabinet can be safely tilted 15 de
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Location Considerations 3.0 LOCATION CONSIDERATIONS The Liebert STS2 should be placed in a clean, cool and dry location. The Liebert STS2 requires only front access for installation and maintenance. Back or side access is not required. Adequate space is required above the unit for conduit (if configured as such) and cooling air flow. This section provides specific information for these considerations. The unit is designed with top and bottom cable terminations to allow maximum flexibility in
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Location Considerations 3.4 Altitude The standard units are designed for full load operation up to 4000 feet (1200 m) above sea level. See Figure 1 for recommended deratings for altitudes greater than 4000 feet (1200 m). Figure 1 Recommended derating for high altitude operation 100 98 96 94 92 90 88 86 Altitude, Feet (M) Above Sea Level Operation at full load at a higher altitude can be accommodated in ambient temperatures less than 104°F (40°C) ambient. Figure 2 shows the maximum allowable am
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Locating the Liebert STS2 4.0 LOCATING THE LIEBERT STS2 This section provides instructions for leveling the Liebert STS2 and anchoring the unit to the floor, should that be required. For leveling feet details, see Figures 5 through 10. 4.1 Leveling and Anchoring the Unit to the Floor The Liebert STS2 can be anchored to the concrete floor to ensure stability for the unit in the event of seismic activity. The seismic brackets are an option for the Liebert STS2 and are shipped separately from the
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Power and Control Wiring 5.0 POWER AND CONTROL WIRING All power and control wiring should be installed by a qualified electrician. All power and control wir- ing must comply with the NEC and applicable local codes. Unless otherwise labeled, use the recom- mended tightening torque as shown in Table 24 - Torque tightening. The busbars are accessible through the front of the Liebert STS2 and designed to allow one-handed tightening. Cables can be installed through the top or bottom of the unit thro
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Power and Control Wiring Figure 3 Typical static transfer switch one-line diagram SOURCE 1 SOURCE 2 STS1 STS2 CB1 CB2 K2 K1 CB3 K2 K3 CB4 K1 K3 CB5 OUTPUT The input and output power wire size should be based on the upstream overcurrent protection device, observing the NEC and local codes. The molded case switches contained in the Liebert STS2 are typically non-automatic circuit breakers that rely on the upstream and/or load overcurrent protection. Upstream overcurrent protection should be rat
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Power and Control Wiring For preparation purposes, the following tables provide the dimensions and wire sizes for the input junction boxes. Table 3 Input junction box dimensions Length Width Height Switch Rating Inches (mm) Inches (mm) Inches (mm) 100 amp 16 (406) 14 (356) 6 (152) 250 to 600 amp 30 (762) 16 (406) 6 (152) Table 4 Input junction box terminal wire size range Switch Rating Power and Ground Lug Wire Range 100 amp #6 to #2/0 AWG 250 to 600 amp (2) #6 AWG to (2) 500 kcmil 11
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Power and Control Wiring 5.3 System Grounding Equipment grounding — Grounding is primarily for equipment and personnel safety, although proper grounding also enhances equipment performance. All input and output power feeds must include an equipment grounding means as required by the NEC and local codes. An insulated equipment ground conductor is recommended to run with each input and output power feed. The equipment ground conductors should be at least the minimum size conductor per the NEC
