Liebert STS2 - Manuals

iv 15.0 E VENT M ESSAGE H ELP T EXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 16.0 M AINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 16.1 Proper Tightening of Nuts and B...

vi TABLES Table 1 Shipping weights (typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Table 2 Heat output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

1 I MPORTANT S AFETY I NSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions that should be followed during the installation and maintenance of the Liebert Static Transfer Switch 2 Power Distribution Unit (STS2/PDU).Read this manual thoroughly, paying special attention to t...

2 A thorough equipment inspection and supervised start-up by qualified service personnel are strongly recommended at these times:1. Before unit is placed into service for the first time2. After equipment relocation, and3. After the unit has been de-energized for an extended period of time ! CAUTION ...

Unpacking and Inspections 3 1.0 U NPACKING AND I NSPECTIONS A high-quality installation begins on the receiving dock. The STS2/PDU and its packaging should be inspected when the unit is delivered. If the packaging is not damaged, unpack the unit and conduct- ing internal inspection before beginning ...

Unpacking and Inspections 4 1.2.1 Handling Considerations The STS2/PDU is bolted to a wood shipping pallet to allow handling by forklift equipment or a pallet jack. Check the unit size and weight. Refer to the cabinet drawings furnished with the unit for size and weight. Typical cabinet dimensions a...

Location Considerations 5 2.0 L OCATION C ONSIDERATIONS The STS2/PDU should be placed in a clean, cool and dry location. The 250A unit without an output cabinet requires only front access for installation and maintenance. Both front and side access are required for installation and maintenance of 40...

Location Considerations 6 2.4 Altitude The standard units are designed for full load operation up to 4000 feet (1200m) above sea level. See Figure 1 for recommended deratings for altitudes greater than 4000 feet (1200m). Figure 1 Recommended derating for high altitude operation Operation at full loa...

Locating The STS2/PDU 7 3.0 L OCATING T HE STS2/PDU This section provides instructions for leveling the STS2/PDU and anchoring the unit to the floor, should that be required. 3.1 Anchoring the Unit to the Floor The STS2/PDU can be anchored to the concrete floor to ensure stability for the unit in th...

Power and Control Wiring 8 4.0 P OWER AND C ONTROL W IRING All power and control wiring must be installed by a licensed, qualified electrician. All power and con- trol wiring must comply with the National Electrical Code and all applicable local codes. Unless oth- erwise labeled, use the recommended...

Power and Control Wiring 9 Figure 3 Typical STS2/PDU, one-line diagram Figure 4 Typical STS2/PDU, one-line diagram, with dual static switch output circuit breakers(not available on 250A units)

Power and Control Wiring 10 Figure 5 Typical STS2/PDU, one-line diagram, with inline distribution, dual static switch output circuit breakers Figure 6 Typical STS2/PDU, one-line diagram, with I-Line distribution, dual static switch output circuit breakers The input and output power wire size should ...

Power and Control Wiring 11 4.2 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 co...

Power and Control Wiring 12 4.5 Power Supply The STS2/PDU is supplied with redundant power supplies that are designed to operate from a voltage range of 200V to 600V. The unit is set at the factory to match the nameplate voltage. Field adjust- ments are not necessary. If the unit needs to operate at...

Output Power Wiring 13 5.0 O UTPUT P OWER W IRING The STS2/PDU standard model is provided with a circuit breaker for connecting to the load or a remote distribution cabinet. Other distribution configurations are available.The three main types of distributions available for the STS2/PDU are: • Output...

Options 14 6.0 O PTIONS This section discusses the options available for the STS2/PDU. The communications options are also discussed in 12.0 - Communication Interfaces . 6.1 Programmable Relay Board The programmable relay board (PRB) provides a means to trigger an external device when an event occur...

Options 15 6.3 Comms Board The Comms Board provides a communication interface to Liebert SiteScan, site monitoring product and/or an external or internal modem. SiteLink-12 or SiteLink-4 is required for SiteScan to communi- cate with the STS2/PDU.The Comms Board is equipped with an RS-422 communicat...

Installation Drawings 17 7.0 I NSTALLATION D RAWINGS Figure 7 Outline drawing, 250A STS2/PDU

Installation Drawings 18 Figure 8 Outline drawing, 250A STS2/PDU with right side I-Line distribution

Installation Drawings 19 Figure 9 Outline drawing, 250A STS2/PDU with right side inline distribution

Installation Drawings 55 Figure 45 Control wiring, 800A STS2/PDU, left side distribution

Installation Drawings 56 Figure 46 Control wiring, 800A STS2/PDU, right side distribution

Installation Drawings 57 Figure 47 Control connection location, 250A STS2/PDU

Installation Drawings 60 Figure 50 Control wiring for the programmable relay board option

Installation Drawings 62 Figure 52 Control wiring for comms board

Installation Drawings 63 Figure 53 Control wiring for the internal modem option

Installation Drawings 65 Figure 55 Control wiring for the RS-232 Port

Installation Drawings 66 Figure 56 Control wiring for remote source selection option

Installation Drawings 67 Figure 57 Color LCD touch screen display

Installation Drawings 68 Table 9 Input circuit breaker schedule, 250-800A STS2/PDU Rating STS2/PDU Input Volts Circuit Breakers (See One-Line Diagrams) Vendor Type Ampacity Voltage Interrupting Rating (Amps) 250A 208V CB6 & CB7 MERLIN GERIN NJHN 400A 208-240V 100K 480V NFNN 150A 380-480V 35K 600...

Introduction to STS2/PDU Operations 69 8.0 I NTRODUCTION TO STS2/PDU O PERATIONS 8.1 System Description A STS2/PDU provides an automatic, seamless transfer between input power sources to an output load. The STS2/PDU monitors the input sources, to ensure each source is operating within set param- ete...

Introduction to STS2/PDU Operations 70 8.1.2 Reliability and Agency Requirements The STS2/PDU is designed for high reliability and high availability with a critical bus Mean Time Between Failure (MTBF) exceeding 1,000,000 hours.The STS2/PDU and all its options are designed, tested and certified, whe...

Introduction to STS2/PDU Operations 71 8.2.2 Transfer Should the preferred source fail or be outside acceptable voltage limits, the STS2/PDU transfers the input to the alternate source until the problem is rectified in the preferred source. The unit can be set to automatically transfer the input bac...

Theory of Operation 72 9.0 T HEORY OF O PERATION 9.1 General Description The STS2/PDU contains all the equipment necessary to prevent an interruption in power flow to the AC load, should your primary source fail. 9.1.1 Static Transfer Switch 2 Power Distribution Unit The STS2/PDU is a combination au...

Theory of Operation 73 9.1.4 Emergency Transfer To ensure that power remains connected to the load, the STS2/PDU automatically performs an emer- gency transfer from one input source to the other when an outage occurs on the existing source.The automatic transfer takes place if the other source’s vol...

Theory of Operation 74 Firmware The operator interface enables you to monitor the STS2/PDU, to configure setpoints for transfers, monitor system parameters and access event and history logs. The firmware is accessible through the LCD touch screen or the RS-232 interface. The firmware includes: • Vie...

Operating Instructions 75 10.0 O PERATING I NSTRUCTIONS After the initial equipment start-up, the following operating guidelines can be used for standard equip- ment operation. These guidelines should be reviewed for any special equipment modifications, special site conditions or company policies th...

Operating Instructions 76 4. Close CB1.5. Verify that Source 1 voltages are nominal and that CB1 breaker status is correctly indicated on the Monitor/Mimic screen. 6. Close CB2.7. Verify that Source 2 voltages are nominal and that CB2 breaker status is correctly indicated on the Mimic screen. 8. Ver...

Operating Instructions 77 Figure 60 Source Transfer screen To manually select the preferred source: 1. Close the input breakers CB6, CB7, CB1 and CB2.2. Select SOURCE XFERS from the menu bar. The Select Preferred Source screen is displayed in the Event Display. 3. Check the Mimic to verify that Sour...

Operating Instructions 78 10.4 Maintenance Bypass The STS2/PDU is equipped with two key-interlocked, bypass breakers, CB4 and CB5, to allow man- ual bypass of the switch electronics for either input source in the event of switch failure or for mainte- nance of the switch. Refer to Figure 3 . While o...

Operating Instructions 79 10.4.1 Bypass Procedures for Source 1 To bypass the switch for Source 1: 1. Verify Source 1 is supplying power via the Mimic. • If the Color Graphical Display is not available, check the gate driver board LEDs through the slots in the control panel. See Figure 61 . 2. Remov...

Operating Instructions 80 10.4.2 Bypass Procedures for Source 2 To bypass the switch for Source 2: 1. Verify Source 2 is supplying power via the Mimic. • If the Color Graphical Display is not available, check the gate driver board LEDs through the slots in the control panel. See Figure 61 . 2. Remov...

Operating Instructions 81 10.5.2 Shutdown in Maintenance Bypass Mode When the Static Transfer Switch 2 Power Distribution Unit is operating on bypass:1. Turn off the load equipment per manufacturer’s recommendations.2. Open CB8 or panelboard breakers and main if supplied3. Open the bypass switch (CB...

Alarms and Faults 82 11.0 A LARMS AND F AULTS Alarms and faults are events that are triggered when the operation of the Static Transfer Switch 2 Power Distribution Unit falls outside of the defined parameters. These events can also be triggered by: user actions, such as changing configurations, clea...

Alarms and Faults 83 11.2 Event and History Logs The system tracks events through the Events Log and tracks significant events through the History Logs. These logs allow you to quickly spot trends or diagnose problems that the unit may have had. Both logs are written in nonvolatile memory.The logs c...

Alarms and Faults 84 11.2.2 History Log When a designated major alarm occurs, the History Status buffer is frozen, capturing 64 sequential frames before and after the alarm condition. When the History Status buffer is frozen, a History Log is created.Two History Logs are available to track major ala...

Alarms and Faults 85 Table 12 Event messages ID Alarm Message Description/Cause Action 1 S1 SCR SHORT One or more of the SCRs for Source 1 have shorted and failed. D, F, A, E 2 S2 SCR SHORT One or more of the SCRs for Source 2 have shorted and failed. D, F, A, E 3 S1 SCR OPEN One or more of the SCRs...

Alarms and Faults 86 81 SOURCES OUT OF SYNC Source 1 and Source 2 are out of synchronization. A, E 82 LOAD ON ALT SOURCE The output load is running on the alternate source. A, E 83 AUTO REXFER INHIBIT Automatic retransfer is inhibited. A, E 84 CB1 (S1) OPEN Source 1, Circuit Breaker 1 is open. A, E ...

Communication Interfaces 87 12.0 C OMMUNICATION I NTERFACES The STS2/PDU monitoring system offers several choices for communications.The RS-232 terminal port is standard on all units. The port is inside the front door, to the left of the touch screen front panel mounting as shown in Figure 55 . This...

Communication Interfaces 88 12.1 Using the RS-232 Port The RS-232 port is configured with a baud rate of 9600 with 8 Data Bits, 1 Stop Bit, No Parity and no hardware handshaking. 12.1.1 Connecting and Using a Terminal An RS-232 connection can be used to connect the STS2/PDU to either a terminal or a...

Communication Interfaces 89 12.1.2 Configuring the STS2/PDU via the Terminal The SPT command is used to configure the systems setpoints. The SVT syntax for the setpoints con- sists for four parameters:SPT [group] [item] [value] where the parameters are: • SPT — is the terminal command that is used t...

Communication Interfaces 90 Value Parameter Item settings, depending on what they are, use various value types. Table 14 provides a list of the possible value types and their description. Table 14 Value types Type Definition Numeric An integer numeric value in the units indicated by the item name. F...

Communication Interfaces 91 Table 15 shows the various groups, the settings contained within and the type of value it requires. Table 15 Group settings and values Group Item: Description Value Type Value Notes Group 1: System Ratings 1 Input Volts (PDU) Integer Set per system spec. 2 Volts Integer S...

Communication Interfaces 92 12.1.3 Setting Bitpacked Options With the Terminal Five sets of options and features settings are available through the terminal to control the system operation.Under System Settings for the SPT command, these items denote which options are INSTALLED: • 6 — Options_1• 14 ...

Communication Interfaces 93 Critical Option Enabling • bit0—EnableManual_IPeakReset• bit1—EnableAutoRestart• bit2 through bit15 - not used (set to 0) Non-Critical Option Enab bit0 — EnableAutoReXferbit1 through bit15 — not used (set to 0) The bits are set in reverse order, from bit 15 on the left to...

Communication Interfaces 94 Putting the Terminal Command Together For example, a unit only has the Remote Source Selection and Dual-Output Breaker options installed.Checking the bits list under Options_1 on page 92 , bits 7 and 0 each must be set to 1 to indicate that these options are installed.The...

Communication Interfaces 95 Examples of Event Mask Settings • To latch event #001, S1 SCR SHORT, use SPT 4 1 +L.• To disable event #128, CONFIG MODIFIED, from sounding the horn, use SPT 4 100 -A.• To enable event #012, OUT VOLT SENSE FAIL, to Dial and go into the Event Log, use SPT 4 12 +D+E. • To d...

Touch Screen Display 96 13.0 T OUCH S CREEN D ISPLAY The STS2/PDU can be configured with a Color Graphical LCD touch screen display that allows you to quickly check the status of the unit and identify problems.A touch screen LCD is available through the front of the STS2/PDU. This screen provides a ...

Touch Screen Display 97 13.2 Menu Overview The touch screen menu provides access to configuration settings and more device information.The CONFIG (Configuration) and LOGS menus provide multiple choices through pop-up menus.The SOURCE XFER menu selection allows you to select the preferred source. The...

Touch Screen Display 98 13.2.1 Security Because the STS2/PDU Color Graphical Display provides access to various configuration and moni- toring choices, a password or key lockout switch may be used to protect access to certain changes, including: • Change configuration settings• Clear logs• Make a so...

Touch Screen Display 99 13.3 Mimic Display The Mimic display provides a color diagram of the operation of the STS2/PDU. This display imitates the power flow through the Static Transfer Switch 2 Power Distribution Unit and indicates source status, breaker status, switch status, source voltage and cur...

Touch Screen Display 100 Event Masks The STS2/PDU gathers, processes and reports faults and alarms, collectively referred to below as events. The Event Mask dialog box allows you to set the system’s response for specific alarms and faults that are generated. See 11.0 - Alarms and Faults for more inf...

Touch Screen Display 101 User Settings The User Settings choice allows you to adjust the user-accessible switch settings. Access is limited to qualified personnel via system security. To access the User Settings dialog box: 1. Select CONFIG.2. Select USER SETTINGS from the pop-up menu. The User Sett...

Touch Screen Display 102 To configure the setpoints for each source: 1. Select SOURCE 1/2 SETPOINTS from the User Settings dialog box. The Source 1/2 Setpoints dialog is displayed. Figure 68 Source setpoints 2. Select 1 to configure the settings for Source 1.3. Configure the settings using the keypa...

Touch Screen Display 103 8. Select FREQUENCY TRIP POINT. A keypad is displayed. This choice verifies that the source is running at the proper frequency. This choice sets the fre- quency deviation in the frequency that triggers the frequency trip point alarm. The frequency deviation setting is the al...

Touch Screen Display 104 PDU Setpoints The PDU Setpoints option allows you to configure the following parameters for the PDU, shown in Figure 69 . • Load Voltage THD (%)• Neutral Current (% of nom)• Ground Current (A)• Load Bus Overcurrent (% of nom) Figure 69 PDU setpoints Table 18 shows the range ...

Touch Screen Display 105 Comm Options The Comm Options dialog box allows you to configure the communications settings for the STS2/ PDU. • Select COMM OPTIONS from the System Settings Menu.• The Comm Options dialog box is displayed. See Figure 70 . • An option can be enabled by selecting YES.• An op...

Touch Screen Display 106 To configure the modem: 1. Select MODEM from the Comm Options menu. The Modem dialog box is displayed. Figure 71 Modem dialog box 2. Select the type of modem that the STS2/PDU will be using: • Select INT if the STS2/PDU will be communicating via an internal modem.• Select EX...

Touch Screen Display 107 12. Configure AUTO DIAL IN. Auto Dial In allows a user to dial into the STS2/PDU through the modem to check status and access the system via a hyperterminal connection.a. Select YES to activate the dial in feature.b. Select NO to deactivate the dial in feature. 13. Configure...

Touch Screen Display 108 Configuring the Input Contact Isolator Settings The Input Contact Isolator (ICI) is an optional, eight-channel input board for up to eight external user alarm or message inputs to be routed to the Static Transfer Switch 2 Power Distribution Unit’s alarm network.The contact i...

Touch Screen Display 109 5. Select DELAY. A keypad is displayed prompting you for a delay time, in seconds, for a condition to exist before the alarm is triggered. 6. Enter the delay value. The range for the values are from 0 (zero) to 99.9 seconds.7. Select OK on the keypad to keep your setting. Th...

Touch Screen Display 110 To configure your programmable relay boards for user defined settings: 1. Select PROG. RELAY BOARD # x from the Comm Options dialog box, where x is the corresponding board number.The Prog. Relay Board dialog box is displayed. Figure 73 Programmable relay board dialog box 2. ...

Touch Screen Display 111 SiteScan Configuration An RS-422 port on the optional Comms Board provides communications with Liebert’s SiteScan. SiteScan is Liebert’s system monitoring software that allows you to utilize a PC to monitor the Static Transfer Switch 2 Power Distribution Unit’s status and ch...

Touch Screen Display 112 PDU This selection is set at the factory to YES, which allows the LCD to draw the Mimic accordingly and display PDU metering and alarm information.Select the PDU button in the System Options window (see Figure 74 ). This opens the PDU Options window, shown below in Figure 75...

Touch Screen Display 113 13.7.1 Logs Two types of logs are kept by the STS2/PDU: Event Log and History Log. Event Log The Event Log tracks the alarms and faults of the STS2/PDU.See 11.0 - Alarms and Faults for more information on these events and see 11.2.1 - Event Log for more information on the Ev...

Touch Screen Display 114 To use the History Log: 1. Select LOGS from the menu bar to open the Logs menu.2. Select either HISTORY LOG 1 or HISTORY LOG 2 from the menu.3. Select the appropriate buttons to replay the log: • Select PREV to go to the previous frame in the sequence.• Select NEXT to go to ...

Specifications 115 14.0 S PECIFICATIONS 14.1 System Configuration The STS2/PDU can be set in several different configurations, according to the model and location. The configuration is set at the factory and does not need to be changed by the customer. 14.1.1 Frequency The STS2/PDU accepts input fre...

Specifications 116 14.1.6 Electrical Requirements 14.1.7 Surge Suppression The static transfer switch is equipped with transient voltage surge suppression on each input for surge suppression. The surge suppression is capable of protecting the static transfer switch from operating outside of toleranc...

Specifications 117 14.2.1 Frame and Enclosure The complete STS2/PDU is housed in a freestanding enclosure. The cabinet is a NEMA type 1 enclo- sure. The cabinet is structurally designed to handle lifting from the base. The frame is designed to accommodate floor stands. The distributed floor weight f...

Specifications 118 14.2.4 Access The STS2/PDU is designed so repairs and maintenance can be done from the front, side or top of the unit. All components that may need repair or replacement during routine field maintenance are safely accessed with the units in bypass without removing power from the u...

Specifications 119 14.2.9 RS-232 Port The unit is equipped with an RS-232 port for connecting a terminal or PC. See Figure 55 for the port’s location. See 12.1 - Using the RS-232 Port for instructions on using a PC terminal with the unit. 14.2.10 Terminal Port Connections The system has an asynchron...

Specifications 120 14.2.11 RS-232 Interface Parameters The service terminal interface parameters are the following settings and cannot be changed. 14.2.12 Maintenance Bypass The STS2/PDU is configured to allow the unit’s electronics to be bypassed to either input source for maintenance without inter...

Event Message Help Text 121 15.0 E VENT M ESSAGE H ELP T EXT S1 SCR SHORT Source 1 SCR ShortOne or more of the SCRs for Source 1 has shorted. Transferring between sources has been inhibited.Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contigu-o...

Event Message Help Text 143 HIST LOGS CLEARED History Logs ClearedBoth History Logs have been erased and the logs are now available to record future events.The event was written to the Event Log, if so configured. TRANSFER COUNTER CLEARED Transfer Counter ClearedTransfer counter reset to 0Contact te...

Maintenance 144 16.0 M AINTENANCE Minimal periodic maintenance of the STS2/PDU is required. As with all electrical distribution compo- nents, the system should be regularly inspected for electrical connection integrity, signs of excessive temperatures, dirt accumulation and proper system operation. ...

Customer Settings 145 17.0 C USTOMER S ETTINGS 17.1 Programmable Relay Board Settings The optional programmable relay board (PRB) has eight channels to report events to an external device. Up to ten (10) events can be programmed to each channel. See 6.1 - Programmable Relay Board for more informatio...

Customer Settings 146 17.2 Input Contact Isolator Settings The Input Contact Isolator board (ICI) provides an STS2/PDU module interface for up to eight exter- nal user alarm or message inputs to be routed through the Static Transfer Switch 2 Power Distribu- tion Unit’s alarm network. See 6.2 - Input...

The Company Behind the Products With over a million installations around the globe,Liebert is the world leader in computer protectionsystems. Since its founding in 1965, Liebert hasdeveloped a complete range of support andprotection systems for sensitive electronics: • Environmental systems—close-co...