Liebert POWER PROTECTION STATIC TRANSFER SWITCH User Manual
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Liebert POWER PROTECTION STATIC TRANSFER SWITCH User Manual

Liebert POWER PROTECTION STATIC TRANSFER SWITCH User Manual

Liebert power protection static transfer switch 2 user manual
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P
P
OWER
ROTECTION
S
T
S
2
TATIC
RANSFER
WITCH
U
M
SER
ANUAL
100-1000 Amp
50-60 Hz

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Summary of Contents for Liebert POWER PROTECTION STATIC TRANSFER SWITCH

  • Page 1 OWER ROTECTION TATIC RANSFER WITCH ANUAL 100-1000 Amp 50-60 Hz...

  • Page 3: Table Of Contents

    Leveling of the Static Switch Without Anchoring ........
  • Page 4 10.5.1 Shutdown in Static Transfer Switch Mode ........
  • Page 5 LEDs and Buttons and Key Lockout Switch........
  • Page 6 15.0 ............110 PECIFICATIONS 15.1 System Configuration.
  • Page 7 Typical static transfer switch one-line diagram ........9 Figure 4 Typical one-line diagram of two PDUs and a static transfer switch ..... . . 11 Figure 5 Outline drawing: 100 –...
  • Page 8 Figure 64 Key lockout switch........

  • Page 9: Important Safety Instructions

    Read the entire manual before installing or operating the system. Adhere to all operating instructions and warnings on the unit and in this manual. Liebert Corporation neither recommends nor knowingly sells this product for use with life support or other FDA-designated “critical” devices.

  • Page 10: Overview Of Manual

    Important Safety Instructions—review the instructions on the previous page before proceeding. Support Information—a blank table in which you can enter pertinent data, such as the serial and part numbers, which is needed when calling Liebert support. Programmable Relay Board Settings Record—a blank table in which you can document your Programmable Relay Board settings.

  • Page 11: Safety Precautions

    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 grate in the front of the system should not be obstructed in order to ensure a smooth air flow through the unit for cooling.

  • Page 12: Unpacking And Inspections

    • If any damage as a result of shipping is observed, file a damage claim with the shipper within 24 hours and contact your local Liebert representative or Liebert Global Services at 1-800-543-2378 to inform them of the damage claim and the condition of the equipment.

  • Page 13: Handling Considerations

    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.

  • Page 14: Table 1 Heat Output

    For dimensions of each unit, see Figures 5, 6 and 7 in section 7.0 - Installation Drawings on page 17. If your unit is equipped with an optional key lockout switch, see Figures 8 through 10 for location of that switch.

  • Page 15: Altitude

    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 Operation at full load at a higher altitude can be accommodated in ambient temperatures less than 104°F (40°C) ambient.

  • Page 16: Locating The Sts2

    Leveling of the Static Switch Without Anchoring The Static Transfer Switch is furnished with casters and leveling feet. After final positioning of the unit, adjust the leveling feet located in each corner of the frame base to level and stabilize the unit.

  • Page 17: Power And Control Wiring

    CAUTION Risk of unit damage. The input sources to the static switch must be grounded-wye sources. Input sources other than solidly grounded-wye sources may cause damage to the switch. The STS2 is designed for operation with 3 or 4-wire solidly grounded sources only.

  • Page 18: Input Junction Box Installation (Optional)

    See Figure 30 for wiring details. For preparation purposes, the following tables provide the dimensions and wire sizes for the input junction boxes. Table 4 Input junction box dimensions Length Switch Rating Inches (mm) 100 amp 16 (406) 250 to 600 amp 30 (762)

  • Page 19: System Grounding

    Where possible, the two power sources should be located in close proximity and a single neutral-to-ground bond made (as shown in Figure 4 on page 11 or as is typical with a double- ended substation). Figure 4 Typical one-line diagram of two PDUs and a static transfer switch SOURCE 1 MICB1 225A...

  • Page 20: Remote Source Selection Wiring

    A six pin terminal block provides the Remote Source Selection connections. Two pairs of wires are used from the switch to trigger the source selection. You can select the type of switch used for this remote control. Connections are made to four of the connections, using Form A dry contacts. The con-...

  • Page 21: Options

    When the STS2 is used as a primary-side switch—on the primary of an isolation transformer—opti- mized transfer greatly reduces the transformer magnetization current during automatic transfers through a new transfer control algorithm. The Liebert algorithm (patent pending) optimizes the transfer timing so that the volt-seconds applied to the downstream transformer primary is balanced, minimizing peak saturation current.

  • Page 22: Distribution Cabinet With I-Line Panelboard-100-600A Units Only

    SiteLink-12 or SiteLink-4 is required for SiteScan to communi- cate with the STS2. The Comms Board is equipped with an RS-422 communication port for communication to a Liebert SiteScan monitoring system using a 2-wire twisted pair for reliable communication up to 1000 meters (3281 feet).

  • Page 23: Network Interface Card (Nic)

    The alarm silence button is not disabled when in the lockout position. The switch is located behind the front door but can be operated without opening the front door. See Figures 8 to 10 for the key lockout location on each unit.

  • Page 24: Input Junction Boxes And Cables

    6.12 Input Junction Boxes and Cables Two input power junction boxes and interconnecting cables provide under floor connection for the two input power feeds. Power terminal blocks are provided in each junction box for the connection of the input power conductors and a parity-sized ground conductor. The junction boxes are NEMA 1 enclo- sures.

  • Page 25: Installation Drawings

    Installation Drawings NSTALLATION RAWINGS Figure 5 Outline drawing: 100 – 250 amp STS2...

  • Page 26: Figure 6 Outline Drawing: 400 - 600 Amp Sts2

    Installation Drawings Figure 6 Outline drawing: 400 – 600 amp STS2...

  • Page 27: Figure 7 Outline Drawing: 800 - 1000 Amp Sts2

    Installation Drawings Figure 7 Outline drawing: 800 – 1000 amp STS2...

  • Page 28: Figure 8 Outline Drawing: 100 - 250Amp Sts2 With A Key Lockout Switch Option

    Installation Drawings Figure 8 Outline drawing: 100 – 250amp STS2 with a key lockout switch option...

  • Page 29: Figure 9 Outline Drawing: 400 - 600 Amp Sts2 With A Key Lockout Switch Option

    Installation Drawings Figure 9 Outline drawing: 400 – 600 amp STS2 with a key lockout switch option...

  • Page 30: Figure 10 Outline Drawing: 800 - 1000 Amp Sts2 With The Key Lockout Switch Option

    Installation Drawings Figure 10 Outline drawing: 800 – 1000 amp STS2 with the key lockout switch option...

  • Page 31: Figure 11 Seismic Anchor Drawing: 100 - 250 Amp Sts2

    Installation Drawings Figure 11 Seismic anchor drawing: 100 – 250 amp STS2 WALL SIDE...

  • Page 32: Figure 12 Seismic Anchor Drawing: 400 - 600 Amp Sts2

    Installation Drawings Figure 12 Seismic anchor drawing: 400 – 600 amp STS2 WALL SIDE...

  • Page 33: Figure 13 Seismic Anchor Drawing: 800 - 1000 Amp Sts2

    Installation Drawings Figure 13 Seismic anchor drawing: 800 – 1000 amp STS2 WALL SIDE...

  • Page 34: Figure 14 Electrical Field Connections Drawing: 100 - 250 Amp Sts2 With Single Output Breaker

    Installation Drawings Figure 14 Electrical field connections drawing: 100 – 250 amp STS2 with single output breaker...

  • Page 35: Figure 15 Electrical Field Connections Drawing: 100 - 250 Amp Sts2 With Dual Output Breakers

    Installation Drawings Figure 15 Electrical field connections drawing: 100 – 250 amp STS2 with dual output breakers...

  • Page 36: Figure 16 Electrical Field Connections Drawing: 400 - 600 Amp Sts2 With Single Output Breaker

    Installation Drawings Figure 16 Electrical field connections drawing: 400 – 600 amp STS2 with single output breaker...

  • Page 37: Figure 17 Electrical Field Connections Drawing: 400 - 600 Amp Sts2 With Dual Output Breakers

    Installation Drawings Figure 17 Electrical field connections drawing: 400 – 600 amp STS2 with dual output breakers...

  • Page 38: Figure 18 Electrical Field Connections Drawing: 800 - 1000 Amp Sts2 With Single Output Breaker

    Installation Drawings Figure 18 Electrical field connections drawing: 800 – 1000 amp STS2 with single output breaker...

  • Page 39: Figure 19 Electrical Field Connections: 800 - 1000 Amp Sts2 With Dual Output Breakers

    Installation Drawings Figure 19 Electrical field connections: 800 – 1000 amp STS2 with dual output breakers...

  • Page 40: Figure 20 Circuit Breaker Schedule

    Installation Drawings Figure 20 Circuit breaker schedule...

  • Page 41: Figure 21 Control Connection Location Diagram: 100 - 600 Amp Sts2

    Installation Drawings Figure 21 Control connection location diagram: 100 – 600 amp STS2...

  • Page 42: Figure 22 Control Connection Location Diagram: 800 - 1000 Amp Sts2

    Installation Drawings Figure 22 Control connection location diagram: 800 – 1000 amp STS2...

  • Page 43: Figure 23 Control Wiring For Remote Source Selection Option

    Installation Drawings Figure 23 Control wiring for remote source selection option...

  • Page 44: Figure 24 Control Wiring For The Programmable Relay Board Option

    Installation Drawings Figure 24 Control wiring for the programmable relay board option...

  • Page 45: Figure 25 Control Wiring For The Input Contact Isolator Board Option

    Installation Drawings Figure 25 Control wiring for the input contact isolator board option...

  • Page 46: Figure 26 Control Wiring For Comms Board (See Figure 27 On Page 39 For Internal Modem Wiring)

    Installation Drawings Figure 26 Control wiring for comms board (see Figure 27 on page 39 for internal modem wiring)

  • Page 47: Figure 27 Control Wiring For The Internal Modem Option

    Installation Drawings Figure 27 Control wiring for the internal modem option LINE TELEPHONE COMMUNICATIONS LINE MODEM...

  • Page 48: Figure 28 Control Wiring For The Network Interface Card (Nic) Option

    Installation Drawings Figure 28 Control wiring for the network interface card (NIC) option...

  • Page 49: Figure 29 Control Wiring For The Rs-232 Port

    Installation Drawings Figure 29 Control wiring for the RS-232 port...

  • Page 50: Figure 30 Outline Drawing For Input Junction Box

    Installation Drawings Figure 30 Outline drawing for input junction box...

  • Page 51: Figure 31 Color Lcd Touch Screen Display

    Installation Drawings Figure 31 Color LCD touch screen display...

  • Page 52: Figure 32 Led Display

    Installation Drawings Figure 32 LED display...

  • Page 53: Figure 33 Installation Drawing, Seismic Floor Stand 100-250A

    Installation Drawings Figure 33 Installation drawing, seismic floor stand 100-250A...

  • Page 54: Figure 34 Installation Drawing, Seismic Floor Stand 100-250A

    Installation Drawings Figure 34 Installation drawing, seismic floor stand 100-250A...

  • Page 55: Figure 35 Installation Drawing, Seismic Floor Stand 100-250A

    Installation Drawings Figure 35 Installation drawing, seismic floor stand 100-250A...

  • Page 56: Figure 36 Installation Drawing, Seismic Floor Stand 100-250A

    Installation Drawings Figure 36 Installation drawing, seismic floor stand 100-250A...

  • Page 57: Figure 37 Installation Drawing, Seismic Floor Stand 400-600A

    Installation Drawings Figure 37 Installation drawing, seismic floor stand 400-600A...

  • Page 58: Figure 38 Installation Drawing, Seismic Floor Stand 400-600A

    Installation Drawings Figure 38 Installation drawing, seismic floor stand 400-600A...

  • Page 59: Figure 39 Installation Drawing, Seismic Floor Stand 400-600A

    Installation Drawings Figure 39 Installation drawing, seismic floor stand 400-600A...

  • Page 60: Figure 40 Installation Drawing, Seismic Floor Stand 400-600A

    Installation Drawings Figure 40 Installation drawing, seismic floor stand 400-600A...

  • Page 61: Figure 41 Installation Drawing, Seismic Floor Stand 800-1000A

    Installation Drawings Figure 41 Installation drawing, seismic floor stand 800-1000A...

  • Page 62: Figure 42 Installation Drawing, Seismic Floor Stand 800-1000A

    Installation Drawings Figure 42 Installation drawing, seismic floor stand 800-1000A...

  • Page 63: Figure 43 Installation Drawing, Seismic Floor Stand 800-1000A

    Installation Drawings Figure 43 Installation drawing, seismic floor stand 800-1000A...

  • Page 64: Figure 44 Installation Drawing, Seismic Floor Stand 800-1000A

    Installation Drawings Figure 44 Installation drawing, seismic floor stand 800-1000A...

  • Page 65: Introduction To Sts2 Operations

    Communication options can be installed in the Color Graphical Display (LCD) unit only. These options provide external communication with the STS2 through a modem, a network card, a program- mable relay board, a contact isolator, or an RS-422 port to Liebert’s SiteScan. 8.1.1...

  • Page 66: Reliability And Agency Requirements

    15.1.5 - Electrical Requirements. 8.1.3 Factory Backup and Service Assistance Because improper installation can cause a system to fail, a Liebert Global Services service technician should thoroughly inspect the unit to ensure it is properly installed and its operating parameters are properly configured.

  • Page 67: Bypass

    8.2.4 Bypass The static transfer switch can be manually bypassed to allow the power from a source to directly flow to the output load. This bypass allows the unit’s electronics to be serviced without dangerous voltages being present. The STS2 includes key-interlocked maintenance bypass breakers that allow either input source’s elec- tronics to be bypassed for maintenance without interruption of power to the load.

  • Page 68: Theory Of Operation

    9.1.1 STS2 Static Transfer Switch The STS2 is a 3 pole, double-throw, solid state automatic transfer switch that is fed from two sources. The Preferred source is the input source that normally carries the load when both sources are avail- able.

  • Page 69: Emergency Transfer

    STS2 automatically triggers an alarm and trips open the other source isolation breaker. In the event of an open SCR, the switch automatically triggers an alarm and transfers the load to the other source. All open and shorted SCR alarm conditions are latched and require the system to be repaired and reset to restore normal operation.

  • Page 70: Circuit Breakers

    All switches in the STS2 are plug-in types, which allows any switch to be replaced without de-energiz- ing the output bus. The Merlin Gerin breakers have an interlock in the plug-in base, which prevents the switch from being withdrawn in the CLOSED position.

  • Page 71: Rs-232 Port

    9.2.4 Logic Modules The logic contains three separate redundant logic modules. The modules contain the logic necessary to run the STS2 and control transfers and shunt trips under all circumstances, without any outside assistance once set-up and started properly. 9.2.5 Audible Alarm An audible alarm is installed on the control board.

  • Page 72: Operating Instructions For The Touch Screen Interface

    Contact your local Liebert representative or Liebert Global Services at 1-800-543-2378 to arrange for equipment inspection and start-up.

  • Page 73: Normal System Turn-On

    8. Verify that boxes for the preferred source and corresponding static transfer switch are highlighted on the Mimic screen, indicating which side of the Static Transfer Switch is on. 9. Close Output Breaker CB3 (and CB3A in redundant output configurations).

  • Page 74: Manual Transfer / Preferred Source Selection

    Without using bypass, if a failure occurs in the switch components for remaining source, the STS2 does not have a second source to switch to and the load would not receive power. See Maintenance Bypass on page 67 for bypass instructions.

  • Page 75: Enabling Remote Source Selection

    Mimic screen. In the event of source or switch failure, the unit should be bypassed only to the current input source. For convenience, instructions for the bypass procedure can be displayed on the touch screen by select- ing the BYP.

  • Page 76: Figure 48 Gate Board Viewing Slot Locations

    Figure 48 Gate board viewing slot locations Viewing Slot for the Source 2 Gate Drive Board GREEN LEDS ON THE GATE DRIVER BOARD ARE VIEWABLE THROUGH THIS SLOT INDICATE THAT THE STS IS ON SOURCE 2 If the Color Graphical Display is not available, you can still use the following bypass procedures, ignore the steps to check the display, and check the LEDs .

  • Page 77: Bypass Procedures For Source 1

    To bypass the switch for Source 1: NOTE If you wish to bypass the Source 1 static transfer switch but Source 2 is presently active, you must first transfer to Source 1. See Manual Transfer / Preferred Source Selection on page 66.

  • Page 78: Bypass Procedures For Source 2

    To bypass the switch for Source 2: NOTE To bypass the Source 2 static transfer switch when Source 1 is presently active, you must first transfer to Source 2. See Manual Transfer / Preferred Source Selection on page 66. 1. Verify Source 2 is supplying power via the Mimic.

  • Page 79: Alarm And Fault

    These events can provide a warning or trigger the system to make a change, such as switch sources or the recording of a history log.

  • Page 80: Event And History Logs

    The History Log allows you to replay the events leading up to the alarm and the events right after the alarm to see the status of the switch at that time and diagnose the cause of the alarm. The History Log is triggered when certain events are tripped that have the Freeze option enabled.

  • Page 81: Alarm Notes

    These events indicate a device failure. The device must be replaced and the system must be restarted for the fault to clear. A shorted SCR automatically trips open a source input switch (CB1 or CB2) to prevent transfers in the event of an SCR failure. The SCR failure must be investigated and repaired before returning the switch to normal operation.

  • Page 82: Table 9 Event Messages

    11.4 List of Messages Table 9 lists available event messages, a definition of the event, and the functions that are activated with the event by default. The functions are indicated as follows: D — The indicated event initiates the Auto-Dial sequence through the optional modem. A —...
  • Page 83 Table 9 Event Messages Alarm Message CB2 SHUNT TRIP FAIL HEATSINK OVERTEMP S1 UV S1 UV (RMS) S1 OV S1 OF/UF S1 FAIL S2 UV S2 UV (RMS) S2 OV S2 OF/UF S2 FAIL S1 OVERCURRENT S2 OVERCURRENT S1 I-PEAK S2 I-PEAK SOURCES OUT OF SYNC LOAD ON ALT SOURCE...

  • Page 84: Communication Interfaces

    12.0 C OMMUNICATION NTERFACES The STS2 monitoring system offers several choices for communications. The RS-232 terminal port is standard on all units. The port is located inside the front door, to the left of the touch screen/LED front panel mounting as shown in Figure 29. This port is primarily used as an alternate user interface to configure, control, and diagnose the system, especially for systems that do not include the HMI touch screen.

  • Page 85: Table 10 Terminal Commands

    12.1.1 Connecting and Using a Terminal An RS-232 connection can be used to connect the STS2 to either a terminal or a PC running terminal emulation software. If you are unsure of the cable pin out, see 15.2.10 - Terminal Port Connec- tions.

  • Page 86: Configuring The Sts2 Via The Terminal

    12.1.2 Configuring the STS2 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 to configure setpoints. •...

  • Page 87: Table 11 Value Types

    Value Parameter Item settings, depending on what they are, use various value types. Table 11 provides a list of the possible value types and their description. Table 11 Value types Type Numeric An integer numeric value in the units indicated by the item name. For example, a System Voltage Rating of 480 would indicate 480 volts.
  • Page 88 Table 12 Group settings and values (continued) Group Item: Description SRC1 Fast Undervoltage Setpoint Group 3: SRC1 Slow Undervoltage User Setpoint Settings SRC1 Slow Undervoltage Detect Delay SRC1 Overvoltage Setpoint SRC1 Overvoltage Detect Delay SRC1 I peak Transfer Setpoint SRC2 Fast Undervoltage Setpoint SRC2 Slow Undervoltage Setpoint...

  • Page 89: Setting Bitpacked Options With The Terminal

    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 •...

  • Page 90: Table 13 Binary-Hexadecimal Conversions

    Critical Option Enabling bit0—EnableManual_IPeakReset bit1—EnableAutoRestart bit2 through bit15 - not used (set to 0) Non-Critical Option Enab bit0 — EnableAutoReXfer bit1 through bit15 — not used (set to 0) The bits are set in reverse order, from bit 15 on the left to bit 0 (zero) on the right. The bits are grouped in four sets of four bits each, as such: 0000 0000 0000 0000 |...|...

  • Page 91: Setting Event Masks With The Terminal

    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 81, bits 7 and 0 each must be set to 1 to indicate that these options are installed.
  • Page 92 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.

  • Page 93: Sts2 Touch Screen Display

    A touch screen LCD is available through the front of the STS2. This screen provides a graphical (Mimic) display of the switch’s operation, plus system information including system parameters, alarms and faults.

  • Page 94: Menu Overview

    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 other menu choices pro- vide information in the display panel.

  • Page 95: 13.2.1 Security

    An optional key lockout switch for the STS2 enables or disables the ability to make changes on the STS2. The key lockout switch is mounted on the front door. See Figures 8 through 10 for location of the key lockout switch.

  • Page 96: Mimic Display

    The Mimic display provides a color diagram of the operation of the STS2. This display imitates the power flow through the static transfer switch and indicates source status, breaker status, switch sta- tus, source voltage and current readings, output power measurements, and active alarm messages.

  • Page 97: Figure 53 Event Mask Dialog Box

    3. Select SAVE to keep the settings. Figure 53 Event mask dialog box 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.

  • Page 98: Figure 54 User Settings Dialog Box

    Figure 54 User settings dialog box Source Set Points The Source 1/2 Set Points allows you to configure trigger points for each input source (1 or 2) for the STS2 via a keypad dialog or HI/LO dialog box. The source numbers do not designate the source as the preferred or alternate source.

  • Page 99: Figure 55 Source Setpoints

    To configure the set points for each source: 1. Select SOURCE 1/2 SET POINTS from the User Settings dialog box. The Source 1/2 Set Points dialog is displayed. Figure 55 Source setpoints 2. Select 1 to configure the settings for Source 1. 3.
  • Page 100 Use of Auto Restart is site specific. Do not enable auto restart unless the infrastructure is designed for unattended operation and there is no chance of equipment or personnel harm by automatic re-energizing of the system. Consult with your Liebert site Engineer as to whether Auto restart should be enabled. STS2 Touch Screen Display...

  • Page 101: System Settings

    System Settings The System Settings choice under the Config menu displays another pop-up menu with three choices: • Comm Options • System Options • System ID To access the System Settings menu: 1. Select CONFIG from the menu bar. 2. Select SYSTEM SETTINGS from the Config menu. Comm Options The Comm Options dialog box allows you to configure the communications settings for the STS2.

  • Page 102: Configuring The Modem

    The Modem dialog box allows you to configure the optional, internal modem or an external modem that is connected to the static transfer switch. Only one modem can be utilized by the STS2. The dialog box contains a series of choices that access either a keypad or a secondary dialog to config- ure settings.
  • Page 103 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’s alarm network. The contact is set to either be normally open or normally closed. When a contact closes or opens, an event is triggered.

  • Page 104: Figure 58 Input Contact Isolator Dialog Box

    The delay allows you to set the number of seconds which a condition needs to persist to trigger an alarm. These input alarms can also be configured to activate a programmable relay output, which is dis- cussed in Configuring the Programmable Relay Board Settings on page 97. To configure the Input Contact Isolator relays: 1.

  • Page 105: Table 15 Standard Settings For Programmable Relays

    Configuring the Programmable Relay Board Settings The STS2 can contain up to two Programmable Relay Boards (PRB) that can trigger an external device when an event occurs in the static transfer switch. For example, if Source 1 fails, an external light flashes.

  • Page 106: Figure 59 Programmable Relay Board Dialog Box

    Configuring the Network Interface Card An optional Liebert OpenComms Network Interface Card (NIC) can be installed in the STS2 to pro- vide Ethernet connectivity via an RJ-45 port. Ethernet cabling is the responsibility of the customer. Category 5 cabling is required.

  • Page 107: Figure 60 System Options

    Liebert’s SiteScan. SiteScan is Liebert’s system monitoring software that allows you to utilize a PC to monitor the static transfer switch’s status and check alarms. See 6.5 - Comms Board for more information on this board.
  • Page 108 System ID Most of the settings for System ID are set by Liebert either at the factory or when the unit is installed. Order No., System Tag No., System ID No. and Model No. are the numbers used to identify and track the system.

  • Page 109: 13.6.2 Logs

    13.6.2 Logs Two types of logs are kept by the STS2: Event Log and History Log. Event Log The Event Log tracks the alarms and faults of the STS2. See 11.0 - Alarm and Faults for more information on these events and see 11.2.1 - Event Log for more information on the Event Log and definitions of the fields displayed in the Event Log screen.

  • Page 110: Source Transfers

    You can select an event in the Event Display to display more information about that event in the Dis- play Panel. This same help is also available in 16.0 - Event Message Help Text. 13.6.7 Logo The Logo menu choice shows the Liebert and Emerson logo in the Display panel. 13.7 Cleaning the LCD Touch Screen If the touch screen requires cleaning, use a pre-moistened towelette designed for cleaning CRTs, or dampen a soft, non-abrasive cloth with a very mild cleaning solution.

  • Page 111: O Perating The Led D Isplay Sts2

    The LED Display unit is monitored and controlled through a series of LEDs and buttons and an optional key lockout switch. This section includes illustrations of the LEDs, buttons and key lockout switch, plus tables providing definitions of these components.

  • Page 112: Led And Push Button Description

    Source 2. A green LED is lit if the output breaker/switch is closed. A green LED is lit if the output breaker/switch is closed. CB3A is installed on units with dual output breakers. A yellow LED is lit if the Source 1 bypass breaker/switch is closed.

  • Page 113: Event Controls

    An optional key lockout switch for the STS2 enables or disables all push button inputs, except for the alarm silence button. The key lockout switch is mounted on the front of the unit. See Figures 8 to 10 for the key lockout switch location on each unit.

  • Page 114: Manual Transfer / Preferred Source Selection

    Without using bypass, if a failure occurs in the switch components for remaining source, the STS2 does not have a second source to switch to and the load would not receive power. See 14.2.3 - Maintenance Bypass on page 107 for bypass instructions.

  • Page 115: Maintenance Bypass

    However, the unit can be bypassed using a make-before-break switching sequence only to the same source to which that the switch is connected. In the event of source or switch failure, the unit should be bypassed only to the current input source. Bypass Procedures for Source 1 If transfer to Source 2 is not desired: 1.
  • Page 116 The LED for CB2 is turned off. 8. Rotate the interlock key and remove it to lockout the breaker. 9. Open output breakers CB3 and CB3A (if supplied) to remove power from static switch. The LEDs for CB3 and CB3A (if supplied) turn off.

  • Page 117: Normal System Shutdown

    14.2.4 Normal System Shutdown The STS2 can be shut down from either the static switch mode or the bypass mode. Shutdown in Static Transfer Switch Mode When the Static Transfer Switch is operating on static transfer switch mode (not mainte- nance bypass mode): 1.

  • Page 118: Specifications

    The input voltage must be three phase AC (3 or 4 wire-plus-ground). The STS2 is designed to accept an input neutral from each source. The neutral is switched in the 4-pole static transfer switch only. The voltage shall be within +/- 10% of the nominal voltage.

  • Page 119: Table 20 Unit Short Circuit Withstand Capability

    15.1.4 Grounding Refer to 5.3 - System Grounding for specifications and instructions regarding grounding. 15.1.5 Electrical Requirements Table 19 Electrical Requirements Item Maximum Continuous Current Load Power Factor Range Load Crest Factor Source Voltage Distortion Overload Capability Table 20 Unit Short Circuit Withstand Capability Unit Voltage Unit Amps 100-250A...

  • Page 120: System Components

    15.2 System Components All STS2 models provide two static transfer switches within one enclosure, with the ability to transfer between two input sources to a single output. All STS2s are configured with either an LCD Color Graphical Interface touch screen display or LEDs for monitoring and configuring the unit.

  • Page 121: 15.2.4 Access

    Mechanical interlocks are provided on the breakers to prevent improper maintenance bypassing of the solid-state switch. A bypass breaker cannot be closed unless the solid-state switch is connected to the same input source and only one bypass breaker can be closed at a time. All breakers are equipped with N.O.

  • Page 122: 15.2.9 Rs-232 Port

    15.2.9 RS-232 Port The unit is equipped with an RS-232 port for connecting a terminal or PC. See Figure 29 for the port’s location. See 12.1 - Using the RS-232 Port for instructions on using a PC terminal with the unit. 15.2.10Terminal Port Connections The system has an asynchronous serial port configured as Data Terminal Equipment for terminal access only (half duplex).

  • Page 123: Interface Parameters

    Setting RS-232 Using EIA Voltage Levels 9600 None <CR> <LF> Not supported Full duplex LED Display Network Interface Card (NIC) Seismic Floor Stand - 18", 24", 30" and 36" Export Crating Internal Modem Remote Source Selection Key Lockout Switch Specifications...

  • Page 124: Event Message Help Text

    One or more of the SCRs for Source 1 has shorted. Transferring between sources has been inhibited. Contact Liebert for technical support at 1-800-LIEBERT (800-543-2378). Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 125 One or more SCRs on Source 2 is open. Transferring between sources has been inhibited. STS2 output has been transferred to Source 1. Contact Liebert for technical support at 1-800-LIEBERT (800-543-2378). Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 126 The primary power supply is no longer providing DC power to the control board and the touch screen. Contact Liebert for technical support at 1-800-LIEBERT (800-543-2378). Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 127 Source 1. The AC input from Source 2 is still good. Contact Liebert for technical support at 1-800-LIEBERT (800-543-2378). Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 128 Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. Contact Liebert for technical support at 1-800-LIEBERT (800-543-2378). This event was written to the Event Log, if so configured.
  • Page 129 Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. Contact Liebert for technical support at 1-800-LIEBERT (800-543-2378). This event was written to the Event Log, if so configured.
  • Page 130 Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. Contact Liebert for technical support at 1-800-LIEBERT (800-543-2378). This event was written to the Event Log, if so configured.
  • Page 131 Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. Contact Liebert for technical support at 1-800-LIEBERT (800-543-2378). This event was written to the Event Log, if so configured.
  • Page 132 S1 UV Source 1 Under Voltage (fast detection). The input voltage from Source 1 dropped below a set percentage of the nominal voltage, as set in the Fast UV set point under the User Settings. An S1 Fail alarm was also issued and source transfer has been inhibited. The load of the STS2 has been transferred to Source 2.
  • Page 133 S1 OF/UF Source 1 Over Frequency/Under Frequency The frequency for Source 1 is running outside the acceptable operating range, as set in the Frequency Trip Point under User Settings. An S1 Fail alarm was also issued and source transfer has been inhibited. Press SILENCE on the touch screen to turn off the audible alarm, if so configured.
  • Page 134 S2 UV (RMS) Source 2 Under Voltage (slow detection). The input voltage from Source 2 remained below a set percentage of the nominal voltage for a designated period, as set in the Slow UV Setting and Slow UV Detection Delay set points configured under the User Settings. An S2 Fail alarm was also issued and source transfer has been inhibited.
  • Page 135 S2 FAIL Source 2 Failure Source 2 has failed due to under voltage (UV), over voltage (OV), or running with an over or under frequency (OF/UF). This alarm is a companion to S2 UV, S2 UV (RMS), S2 OV and S2 OF/UF. The load of the STS2 has been transferred to Source 1.
  • Page 136 S1 I-PEAK Current Peak on Source 1 The peak current from Source 1 has exceeded the set point as defined in the I-PK Xfer Lockout setting under User Settings. Transferring to Source 2 has been inhibited. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 137 LOAD ON ALT SOURCE STS2 load on the alternate source. The static transfer switch is running on the alternate power source. Check the Event Log to determine the reason for the transfer from the preferred source. Another event has caused the system to transfer to the alternate source. The system returns the load to the preferred source either automatically or manually, depending on how the system is configured.
  • Page 138 Circuit Breaker 4 (Source 1 Bypass Breaker) Closed Circuit breaker 4 is not open. The input from Source 1 is bypassing the static transfer switch. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 139 Circuit breaker 3A is not closed. This circuit breaker is assigned to the output load. The power flow to the load cannot flow through the static transfer switch. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 140 TRANSFER INHIBITED Transfer Inhibited Uninterrupted transfer between sources is inhibited due to input source failure, sources out of sync, switch failure, or the unit is in bypass mode. Check the Event Log for the event or events that may have caused the alarm.
  • Page 141 INPUT CONTACT #2 Input Contact Isolator #2 Occurrence of the indicated external event has been detected by Input Contact Isolator #2 of the Open Comms Digital Input option board. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 142 INPUT CONTACT #6 Input Contact Isolator #6 Occurrence of the indicated external event has been detected by Input Contact Isolator #6 of the Open Comms Digital Input option board. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 143 CONFIG MODIFIED Configuration Modified A set point has been updated and saved. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. The event was written to the Event Log, if so configured.
  • Page 144 EVENT LOG CLEARED Event Log Cleared All past alarms and faults are no longer recorded in the system’s event log. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.

  • Page 145: Maintenance

    17.0 M AINTENANCE WARNING Only qualified service personnel should perform maintenance on the static switch. Lethal voltages exist inside the unit during normal operation. The unit is supplied by multiple ac power sources. disconnect and lock-out all power sources before working inside unit.

  • Page 146: Support Information

    For repair or maintenance service outside the 48 contiguous states, contact Liebert Global Services, if available in your area. For areas not covered by Liebert Global Services, the authorized distributor is responsible for providing qualified factory-authorized service. Additional telephone numbers and e-mail contact information is on the back page of this manual.

  • Page 147: Programmable Relay Board Settings Record

    ROGRAMMABLE ELAY 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 information on the PRB. If your STS2 has the PRB option installed, list the settings below for future reference.
  • Page 148 Maintenance Channel 8: Channel 9: Channel 10: PRB Notes:...

  • Page 149: Input Contact Isolator Settings Record

    The Input Contact Isolator board (ICI) provides an STS2 module interface for up to eight external user alarm or message inputs to be routed through the static transfer switch’s alarm network. See 6.4 - Input Contact Isolator Board for more information on the ICI.
  • Page 150 Maintenance...

  • Page 152: Technical Support Service

    © 2005 Liebert Corporation All rights reserved throughout the world. Specifications subject to change without notice. ® Liebert and the Liebert logo are registered trademarks of Liebert Corporation. All names referred to are trademarks or registered trademarks of their respective owners.

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