AC Power For Business-Critical Continuity™ Liebert ® STS2 Static Transfer Switch2 The Cornerstone of High-Availability Power Systems The Power to Protect Your Critical Operations For maximum availability applications, the Liebert Static Transfer Switch2 (STS2) provides an automatic, seamless transfer between your critical load and the outputs of two independent UPS systems in a dual-bus power configuration. If the primary UPS should fail, the switch will automatically transfer the loads to the alternate UPS. Liebert is the market leader in dual-bus power systems, building the world’s most reliable UPS and Static Transfer Switch products. Liebert STS2 further extends our market leadership with design benefits unmatched by competitive products. Standard Features Of The Liebert STS2 Provide Greater Overall Protection Reliability: 100% rated, fuseless design. Hot-swappable circuit breakers. Flash memory enables firmware updates while supporting critical load. Rack-out control/power assembly on units up to 600A to allow maintenance, service or full replacement without disrupting the critical load. Flexibility: Internal CANBUS protocol: high-bandwidth communication between system components via twisted-pair cables. Options can be added as simple network nodes. Dual-lug installation bus with pem nuts for single-hand installation and “hot” torque service. Color Touch-Screen Interface The color touch-screen LCD interface allows you to quickly check the status of the unit and identify problems. The controls of the Liebert STS2 are intuitive and simple. Low Total Cost Of Ownership: Conservative design margins and excellent overload capacity. UL listed. 2 The color LCD monitor is divided into three segments. In addition to a system mimic diagram, there is a Status/Alarm panel and a section dedicated to operator instructions and menus. The screen allows you to configure the unit, including the control of the preferred source, auto/manual retransfer selection, alarm notification and other system setpoints. You benefit from improved operator effectiveness, reduced training time, and less chance of operator error. True Front-Access Design All mechanical and electronic components of the Liebert STS2 are accessible from the front of the unit for installation and service—no side or rear access required. This gives you several immediate benefits: Greater freedom in system design. The Liebert STS2 can be placed adjacent to or in back of other equipment. It can also be placed against a wall or partition. Simplified installation, with ample space for cable connections through top and bottom access plates. Less floor space required for maintenance access. Designed for maintainability, with all key components visible and accessible from the front of the unit, without shutting down the connected load. For units up to 600 amps, the entire power and control module can be removed as an assembly. A separate compartment for option modules provides safe and convenient field access. True Internal Redundancy The Liebert STS2 has tripleredundant logic. Each DSP controller is capable of working independently, and each helps monitor the other two. If one malfunctions, the other two lock it out. Each controller has power feeds from both power supplies. One-Line Diagram The two power supplies feature true dual-bus power distribution. Both have dual inputs, one from each AC input source. All power connections have diode protection, so that internal or external faults cannot propagate. The result is a rugged, fault-resilient package that is optimized for realworld applications. Source 2 Source 1 K2 K3 CB1 CB2 K1 K2 CB4 CB3 K1 K3 CB5 System Output 3 Optimized Transfer Option Enhances Cost-Efficient System Operation Liebert offers a patented optimized transfer option for the Liebert STS2 that greatly improves operation when used in primary side switching applications. Figure 1 Standard STS2 transfer Figures 1 and 2 show results for the standard STS2 vs. the optimized STS2 for the same condition (alternate source lags 120 degrees) respectively. The optimized transfer control algorithm minimizes the transformer saturation current resulting from an out of phase transfer. load voltages transformer fluxes primary currents The Liebert STS2 can be used in two different types of high-availability dual bus configurations—as primary or secondary side switches. For primary side switching, the unit is connected to the primary or input of a downstream transformer. On secondary side switching the Liebert STS2 is connected to the secondary or output of two transformers. One of the main advantages of using primary side switching is lower cost. These savings are the result of only one power distribution unit, a lower current due to 480V vs. 208V, and lower installation and wiring cost thanks to use of smaller three wire cable. The one drawback of this configuration is the creation of transformer inrush saturation current each time switching occurs. The downstream transformer can cause large peak saturation current during automatic transfers. The transformer saturation is caused by DC-flux built-up during transfer, especially when the sources See also White Paper “STS2 Optimized Transfer (June 4, 2004)” at www.liebert.com. 4 are not in phase. Figure 2 Optimized STS transfer Liebert’s transfer control does more than balance the flux. Due to our unique approach to the optimized transfer algorithm, transfer time should not be the only performance measure for this new optimized switch. Liebert’s method, whenever possible, also seeks to minimize voltage disturbances while maintaining transformer flux balance. It takes both voltage disturbance and volt-second balance into consideration. Liebert has a unique flux balance algorithm that doesn’t just “sit and wait” for the balance point to occur. Rather, we will “pulse fire” the SCRs as soon as possible in order to minimize the load discontinuity and hence the voltage disruption. The patented Liebert static switch optimized transfer control algorithm eliminates the downstream transformer inrush saturation. The Liebert algorithm is designed to optimize transfer timing such that the volt-seconds applied to the So how safe is this new optimized Liebert STS2 for your critical loads? downstream transformer primary is balanced, thus minimizing peak saturation current. This balance is achieved by directly computing the volt-second applied to the transformer during transfer events and The optimized Liebert STS2 safely meets determining the optimum time to turn on the alternate source SCRs in order to balance the volt- both the CBEMA standard (prior to 1996) second within specified tolerance. and the latest ITIC standard (1996) for critical loads. Liebert’s optimized This results in a volt-second balancing algorithm that is independent of voltage wave shape, voltage failure decay rate, etc., making it superior to other algorithms based on voltage phase angle difference only. STS2 eliminates the risk of transformer saturation problems during automatic transfers, while its algorithm control ensures minimum voltage disturbance during transfers while still balancing the flux. 5 Liebert STS2 Communication and Product Options Liebert STS2 has a wide choice of monitoring and communications options to keep you connected to your critical power protection system. Seismic Anchors — To ensure stability for the unit in the event of seismic activity, anchors are available for securing the unit to a concrete floor to meet seismic Zone 4 requirements. RS-232 Terminal Port — Standard on all units, this port is primarily used as an alternate user interface to configure, control, and diagnose the system. Seismic Floor Stand — Designed to level the unit and provide bottom cabling access without relying upon a raised floor for support. Available in 18, 24, 30, 36 inch heights. Input Contact Isolator (ICI) Board — Customizable input relays allow alarms from other devices to be displayed on Liebert STS2 display. Provides an interface for up to eight user inputs. External messages and alarms can be routed to the unit, via the ICI. Distribution Cabinet (Up to 600A) — An output distribution cabinet mounts on the side of the STS2. It is a full height section with hinged doors to allow for easy access. The cabinet contains one vertically mounted I-line panelboard for load distribution. The panelboard is totally enclosed with an accent cover that provides access without exposing other portions of the unit. The panelboard provides space for 100A through 250A three-pole branch circuit breakers. It also includes a separate isolated neutral bus bar and safety-ground bus bar for the neutral and safety-ground connections. Programmable Relay Board (PRB) — Programmable output relays for custom customer alarms and connections. Up to two PRBs can be installed in the Liebert STS2 to route system events to external devices. Comms Board — Includes a terminal block to provide a DTE connection to an external modem. This board also provides a direct connection to a Liebert SiteScan® Web system, via an RS-422. SiteLink-12 or SiteLink-4 is required for SiteScan to communicate with the Liebert STS2. Liebert IntelliSlot™ 485 Web Card ADPT Allows systems to be viewed from the network using a web browser. Delivers SNMP, Telnet and web management. Provides security using HTTPS message encryption. Supports 10 and 100 MBit Ethernet for legacy and modern networks. Provides compatibility with Liebert MultiLink shutdown software, to prevent data loss and ensure data availability. Supports Liebert SiteScan WEB enterprise monitoring software, to provide trending for proactive analysis and maintenance to ensure facility uptime. Interfaces to Liebert Nform alarm notification software, to facilitate quick corrective action. Liebert IntelliSlot 485 Web Card ADPT provides connectivity to any TCP/IP-based Ethernet network to allow the device to communicate with network management systems (NMS) via SNMP. Events can be transmitted to the NMS to provide remote status monitoring, plus fault and alarm detection. The card includes an RJ-45 port for an Ethernet connection, via Category 5 cable. The card can also integrate the system with an existing Building Management System (BMS) or out-of-band monitoring, using Modbus. 6 Options and Accessories Redundant Output Breaker — An output plug-in, nonautomatic circuit breaker provides redundancy in the output power path. The breaker is connected in parallel with the output plug-in non-automatic circuit breaker. Input Junction Boxes and Cable (Up to 600A) — The input junction box option is available to simplify input connections to the STS2. Two input junction boxes and the associated flexible 10-foot long input cables are provided with this option. Available with bottom cable entrance only, typically when the unit is located on a raised floor. Remote Source Selection — An optional Remote Source Selection board may be installed in your STS2. This option allows you choose the preferred input source from a remote location. Terminal connections enable you to remotely select a preferred source in the same process as the local source transfer selection. Key Lockout Switch — The key lockout switch activates a software lockout of the touch-screen display to prevent manual transfers and configuration changes. When locked out, the touch-screen becomes a read only display. A key is needed to perform manual transfers or change settings. Critical Space Support from Emerson Network Power Service Total Service Capability Remote Monitoring — Always There, Always Alert Emerson Network Power Service provides a Basic, Essential and Preferred level of maintenance and service that allows you to select the complement of critical power system services that best fits your requirements. These programs include guaranteed four-hour response time, emergency service and preventive maintenance. The key to providing proper service for your critical power systems is being aware of that equipment’s operating status at any given time. For customers who need to have these vital protection systems continuously monitored, but don’t want to do it themselves, Emerson Network Power Service offers Remote Monitoring Service. This seamless, rapid-response system is designed to maximize the capabilities of your Liebert equipment by maximizing the effectiveness of its monitoring capabilities. With more than 300 Liebert-employed Customer Engineers and a network of over 900 factory authorized service personnel, our technical capabilities, geographical coverage and ability to respond are second to none. These factory-trained service professionals have direct access to the most comprehensive factory authorized parts network in the industry. We also provide them with immediate online access to detailed schematics and your equipment’s complete service record from the time it was started up. Continuous 24-hour remote monitoring of UPS/power conditioning equipment, environmental products and other critical space support systems is available. No matter where your facilities are located, we can provide continuous oversight of a wide range of critical installations from our Customer Response Center. When a problem is detected, the monitoring system immediately alerts the Customer Response Center where each alarm is evaluated and processed. The center offers instant phone assistance using a customer-defined response and call escalation plan. Liebert will coordinate all service vendors, track the response and solution time for service calls and provide comprehensive reports on alarms and corrective actions. 7 Ensuring The High Availability Of Mission-Critical Data And Applications. Specifications Heat Amp Output Rating (KW) Liebert Corporation Uncrated Dimensions (WxDxH) (inches) (mm) 100 0.8 30x32x77 762x813x1956 250 1.37 30x32x77 400 2.04 38x32x77 600 3.08 800 1000 Uncrated Weight (lbs) (kg) Shipping Dimensions1 (WxDxH) (inches) (mm) 780 354 48x44x82 1016x1194x2082 762x813x1956 780 354 48x44x82 965x813x1956 1200 544 48x44x82 38x32x77 965x813x1956 1200 544 4.03 84x32x77 2134x813x1956 2500 5.09 84x32x77 2134x813x1956 2500 Shipping Weight1 (lbs) (kg) 880 399 1016x1194x2082 880 399 1016x1194x2082 1300 590 48x44x82 1016x1194x2082 1300 590 1134 92x53x82 2337x1346x2082 2600 1179 1134 92x53x82 2337x1346x2082 2600 1179 Note: Shipping dimensions and weight include the pallet and packing material. Actual weights will vary depending on installed options. 1050 Dearborn Drive P.O. Box 29186 Columbus, Ohio 43229 800 877 9222 Phone (U.S. & Canada Only) 614 888 0246 Phone (Outside U.S.) 614 841 6022 FAX Via Leonardo Da Vinci 8 Zona Industriale Tognana 35028 Piove Di Sacco (PD) Italy 39 049 9719 111 Phone 39 049 5841 257 FAX 1 Operating Specifications Voltage: 208, 220, 240, 380, 400, 415, 480 or 600 VAC (field selectable), +/- 10% Frequency: 50 or 60 Hz (field selectable), +/- 0.5 Hz Overload Capability: 125% for 10 minutes,150% for 2 minutes Operating Temperature: 0 to 40° C Emerson Network Power Asia Pacific 7/F., Dah Sing Financial Centre 108 Gloucester Rd, Wanchai Hong Kong 852 25722201 Phone 852 28029250 FAX liebert.com 24 x 7 Tech Support 800 222 5877 Phone 614 841 6755 (outside U.S.) While every precaution has been taken to ensure accuracy and completeness in this literature, Liebert Corporation assumes no responsibility, and disclaims all liability for damages resulting from use of this information or for any errors or omissions. © 2006 Liebert Corporation. All rights reserved throughout the world. Specifications subject to change without notice. All names referred to are trademarks or registered trademarks of their respective owners. ® Liebert and the Liebert logo are registered trademarks of the Liebert Corporation. SL-20600 (R03/08) Emerson Network Power. The global leader in enabling Business-Critical Continuity™. Printed in USA EmersonNetworkPower.com AC Power Embedded Computing Outside Plant Racks & Integrated Cabinets Connectivity Embedded Power Power Switching & Controls DC Power Monitoring Precision Cooling Services Surge Protection Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co. ©2006 Emerson Electric Co.