Liebert Static Transfer Switch 2 Installation, Operation & Maintenance Manual
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Liebert Static Transfer Switch 2 Installation, Operation & Maintenance Manual

Liebert Static Transfer Switch 2 Installation, Operation & Maintenance Manual

100-1000 amp, 50-60 hz
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P
P
OWER
ROTECTION
Static Transfer Switch 2
I
, O
& M
M
NSTALLATION
PERATION
AINTENANCE
ANUAL
100-1000 Amp, 50-60 Hz

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  • Page 1 OWER ROTECTION Static Transfer Switch 2 & M NSTALLATION PERATION AINTENANCE ANUAL 100-1000 Amp, 50-60 Hz...

  • Page 3: Table Of Contents

    Table of Contents IST OF IGURES ............IST OF ABLES .
  • Page 4 PTIONS ............18 Programmable Relay Board .
  • Page 5 PERATING NSTRUCTIONS FOR THE OUCH CREEN NTERFACE 10.0 ....58 10.1 Normal System Turn-On........... . 58 10.2 Manual Transfer / Preferred Source Selection .
  • Page 6 13.7 Cleaning the LCD Touch Screen..........97 PERATING THE ISPLAY 14.0...
  • Page 7 Contacting Liebert ........

  • Page 9: List Of Figures

    List of Figures Figure 1 Recommended Derating for High Altitude Operation....... . . 11 Figure 2 Maximum Ambient Temperature for Full Load Operation at Higher Altitudes .
  • Page 10 Figure 50 Front Panel LEDs and Buttons ..........100 Figure 51 Control Buttons .

  • Page 11: List Of Tables

    List of Tables Table 1 Heat Output ............................ 10 Table 2 Altitude Conversion—Feet to Meters .................... 11 Table 3 Input/Output Conduit Plate Specifications................... 14 Table 4 Input Junction Box Dimensions ....................15 Table 5 Input Junction Box Terminal Wire Size Range ................15 Table 6 Remote Source Selection Terminal Block ..................

  • Page 13: Important Safety Instructions

    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 (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.

  • Page 14: Overview Of Manual

    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 15: Support Information

    If you require assistance for any reason, in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States, contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide qualified factory-authorized service.
  • Page 16 Channel 4: Channel 5: Channel 6: Channel 7: Channel 8: Channel 9: Channel 10: PRB Notes:...

  • Page 17: Input Contact Isolator Settings Record

    NPUT ONTACT SOLATOR ETTINGS ECORD 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 6.2 - Input Contact Isolator Board on page 19 for more information on the ICI. If your STS2 has the ICI option installed, list the settings below for future reference.

  • Page 19: Safety Precautions

    AFETY RECAUTIONS 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 9 before attempting to move the unit. Under typical operation and with the doors closed, only normal safety precautions are necessary.

  • Page 20: 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 21: 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 22: Location Considerations

    OCATION ONSIDERATIONS The STS2 should be placed in a clean, cool and dry location. The 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 infor- mation for these considerations.

  • Page 23: 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 Altitude (Feet Above Sea Level) Operation at full load at a higher altitude can be accommodated in ambient temperatures less than 104°F (40°C) ambient.

  • Page 24: Locating The Sts2

    STS2 OCATING THE This section provides instructions for leveling the STS2 and anchoring the unit to the floor, should that be required. For leveling feet details, see Figure 5 through Figure 10 in section 7.0 - Installation Drawings on page 23. Leveling and Anchoring the Unit to the Floor The STS2 can be anchored to the concrete floor to ensure stability for the unit in the event of seis- mic activity.

  • Page 25: Power And Control Wiring

    OWER AND ONTROL IRING All power and control wiring should be installed by a qualified electrician. All power and control wiring must comply with the NEC and applicable local codes. Unless otherwise labeled, use the rec- ommended tightening torque as shown in Table 26 - Torque tightening, provided in 17.0 - Maintenance on page 135.

  • Page 26: Input Junction Box Installation (Optional)

    Figure 3 Typical Static Transfer Switch One-Line Diagram SOURCE 1 SOURCE 2 STS1 STS2 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 STS2 are typically non-automatic circuit breakers that rely on the upstream and/or load overcurrent protection.

  • Page 27: System Grounding

    For preparation purposes, the following tables provide the dimensions and wire sizes for the input junction boxes. Table 4 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)

  • Page 28: Control Wiring Connections

    Figure 4 Typical One-Line Diagram of Two PDUs and a Static Transfer Switch SOURCE 1 SOURCE 2 MICB1 MICB2 ISOLATION ISOLATION TRANSFORMER TRANSFORMER STS1 STS2 225A 225A 225A 225A 225A 225A Control Wiring Connections No control wiring is needed on the standard STS2. Only certain options require external control wiring.

  • Page 29: Power Supply

    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 a voltage other than what is listed on the nameplate, contact Liebert Global Services or the local Liebert representative. Table 7 provides transformer tap information.

  • Page 30: Options

    This section discusses the options available for the STS2. The communications options are also dis- cussed in 12.0 - Communication Interfaces on page 70. WARNING ALL OPTIONS MUST BE INSTALLED BY LIEBERT GLOBAL SERVICES OR LIEBERT FACTORY-AUTHORIZED SERVICE PROVIDED BY A LIEBERT DISTRIBUTOR. THE OPTION AREA...

  • Page 31: Input Contact Isolator Board

    SiteLink-12 or SiteLink-4 is required for SiteScan to communicate 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 32: Network Interface Card (Nic)

    Network Interface Card (NIC) An OpenComms Network Interface Card (NIC) enables the STS2 to communicate to a network management system (NMS). The NIC provides the internal hardware and software to communi- cate, via SNMP , to any I.P .-based Ethernet network through an RJ-45 connector using Category 5 cabling.

  • Page 33: Input Junction Boxes And Cables

    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 enclosures.
  • Page 34 Options...

  • Page 35: Installation Drawings

    NSTALLATION RAWINGS Figure 5 Outline Drawing: 100 – 250 Amp STS2 Installation Drawings...

  • Page 36: Figure 6 Outline Drawing: 400 - 600 Amp Sts2

    Figure 6 Outline Drawing: 400 – 600 Amp STS2 Installation Drawings...

  • Page 37: Figure 7 Outline Drawing: 800 - 1000 Amp Sts2

    Figure 7 Outline Drawing: 800 – 1000 Amp STS2 Installation Drawings...

  • Page 38: Figure 8 Outline Drawing: 100 - 250 Amp Sts2 With A Key Lockout Switch Option

    Figure 8 Outline Drawing: 100 – 250 Amp STS2 with a Key Lockout Switch Option Installation Drawings...

  • Page 39: Figure 9 Outline Drawing: 400 - 600 Amp Sts2 With A Key Lockout Switch Option

    Figure 9 Outline Drawing: 400 – 600 Amp STS2 with a Key Lockout Switch Option Installation Drawings...

  • Page 40: Figure 10 Outline Drawing: 800 - 1000 Amp Sts2 With The Key Lockout Switch Option

    Figure 10 Outline Drawing: 800 – 1000 Amp STS2 with the Key Lockout Switch Option Installation Drawings...

  • Page 41: Figure 11 Seismic Anchor Drawing: 100 - 250 Amp Sts2

    Figure 11 Seismic Anchor Drawing: 100 – 250 Amp STS2 Installation Drawings...

  • Page 42: Figure 12 Seismic Anchor Drawing: 400 - 600 Amp Sts2

    Figure 12 Seismic Anchor Drawing: 400 – 600 Amp STS2 Installation Drawings...

  • Page 43: Figure 13 Seismic Anchor Drawing: 800 - 1000 Amp Sts2

    Figure 13 Seismic Anchor Drawing: 800 – 1000 Amp STS2 Installation Drawings...

  • Page 44: Figure 14 Electrical Field Connections Drawing: 100 - 250 Amp Sts2 With Single Output Breaker

    Figure 14 Electrical Field Connections Drawing: 100 – 250 Amp STS2 with Single Output Breaker Installation Drawings...

  • Page 45: Figure 15 Electrical Field Connections Drawing: 100 - 250 Amp Sts2 With Dual Output Breakers

    Figure 15 Electrical Field Connections Drawing: 100 – 250 Amp STS2 with Dual Output Breakers Installation Drawings...

  • Page 46: Figure 16 Electrical Field Connections Drawing: 400 - 600 Amp Sts2 With Single Output Breaker

    Figure 16 Electrical Field Connections Drawing: 400 – 600 Amp STS2 with Single Output Breaker Installation Drawings...

  • Page 47: Figure 17 Electrical Field Connections Drawing: 400 - 600 Amp Sts2 With Dual Output Breakers

    Figure 17 Electrical Field Connections Drawing: 400 – 600 Amp STS2 with Dual Output Breakers Installation Drawings...

  • Page 48: Figure 18 Electrical Field Connections Drawing: 800 - 1000 Amp Sts2 With Single Output Breaker

    Figure 18 Electrical Field Connections Drawing: 800 – 1000 Amp STS2 with Single Output Breaker Installation Drawings...

  • Page 49: Figure 19 Electrical Field Connections: 800 - 1000 Amp Sts2 With Dual Output Breakers

    Figure 19 Electrical Field Connections: 800 – 1000 Amp STS2 with Dual Output Breakers Installation Drawings...

  • Page 50: Figure 20 Circuit Breaker Schedule

    Figure 20 Circuit Breaker Schedule Installation Drawings...

  • Page 51: Figure 21 Control Connection Location Diagram: 100 - 600 Amp Sts2

    Figure 21 Control Connection Location Diagram: 100 – 600 Amp STS2 Installation Drawings...

  • Page 52: Figure 22 Control Connection Location Diagram: 800 - 1000 Amp Sts2

    Figure 22 Control Connection Location Diagram: 800 – 1000 Amp STS2 Installation Drawings...

  • Page 53: Figure 23 Control Wiring For Remote Source Selection Option

    Figure 23 Control Wiring for Remote Source Selection Option Installation Drawings...

  • Page 54: Figure 24 Control Wiring For The Programmable Relay Board Option

    Figure 24 Control Wiring for the Programmable Relay Board Option Installation Drawings...

  • Page 55: Figure 25 Control Wiring For The Input Contact Isolator Board Option

    Figure 25 Control Wiring for the Input Contact Isolator Board Option Installation Drawings...

  • Page 56: Figure 26 Control Wiring For Comms Board (See Figure 27 On Page 45 For Internal Modem Wiring)

    Figure 26 Control Wiring for Comms Board (see Figure 27 on page 45 for Internal Modem wiring) Installation Drawings...

  • Page 57: Figure 27 Control Wiring For The Internal Modem Option

    Figure 27 Control Wiring for the Internal Modem Option Installation Drawings...

  • Page 58: Figure 28 Control Wiring For The Network Interface Card (Nic) Option

    Figure 28 Control Wiring for the Network Interface Card (NIC) Option Installation Drawings...

  • Page 59: Figure 29 Control Wiring For The Rs-232 Port

    Figure 29 Control Wiring for the RS-232 Port Installation Drawings...

  • Page 60: Figure 30 Outline Drawing For Input Junction Box

    Figure 30 Outline Drawing for Input Junction Box Installation Drawings...

  • Page 61: Figure 31 Color Lcd Touch Screen Display

    Figure 31 Color LCD Touch Screen Display Installation Drawings...
  • Page 62 Installation Drawings...

  • Page 63: 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 pro- grammable relay board, a contact isolator, or an RS-422 port to Liebert’s SiteScan. 8.1.1...

  • Page 64: Reliability And Agency Requirements

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

  • Page 65: Transfer Inhibit

    8.2.3 Transfer Inhibit For a transfer to be completed between input sources, the sources must meet certain parameters, or the transfer cannot take place. Uninterrupted transfer between sources is inhibited due to input source failure, sources out of sync, switch failure, or the unit is in bypass mode. 8.2.4 Bypass The static transfer switch can be manually bypassed to allow the power from a source to directly...

  • Page 66: Theory Of Operation

    HEORY OF PERATION General Description The STS2 contains all the equipment necessary to prevent an interruption in power flow to the AC load, should your primary source fail. 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.

  • Page 67: Emergency Transfer

    9.1.4 Emergency Transfer To ensure that power remains connected to the load, the STS2 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 voltage is within acceptable limits, and regardless of the phase difference between the two sources.

  • Page 68: Circuit Breakers

    Hardware • The STS2 operator interface in the Color Graphical Display unit is designed to provide all of the information required to configure and monitor the unit’s operation. • The control logic performs automatic operations with minimal operator interface. • Each STS2 unit is equipped with either a color LCD touch screen or a panel of LEDs and push buttons.

  • Page 69: Scrs

    9.2.3 SCRs Brick-type SCRs are used rated to carry the full 100% rated load. Because the unit is a fuseless design with non-automatic circuit breakers, overcurrent protection is provided by upstream circuit breakers. 9.2.4 Logic Modules The logic contains three separate redundant logic modules. The modules contain the logic neces- sary to run the STS2 and control transfers and shunt trips under all circumstances, without any outside assistance once set-up and started properly.

  • Page 70: 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. After the initial equipment start-up, the following operating guidelines can be used for standard equipment operation.

  • Page 71: Manual Transfer / Preferred Source Selection

    Figure 33 STS2 Touch Screen Display Mimic Sources Static Transfer Event controls Switch Event display 4. Close CB1. 5. Verify that Source 1 voltages are nominal and CB1 breaker status is correctly indicated on the Monitor/Mimic screen. 6. Close CB2. 7.

  • Page 72: Figure 34 Source Transfer Screen

    NOTE If one source will be de-energized for an extended period (hours or days), set the unit to bypass mode for the remaining source. 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.

  • Page 73: Enabling Remote Source Selection

    If the Transfer Inhibit message is displayed, check for alarm messages on the Active Status window. Correct alarm conditions before attempting a source transfer. NOTE The preferred source may also be changed via the optional Remote Source Selection option, thereby initiating a transfer remotely. 10.3 Enabling Remote Source Selection If your system is equipped with the optional Remote Source Selection option, it must be enabled.

  • Page 74: Bypass Procedures For Source 1

    Figure 35 Gate Board Viewing Slot Locations Touch Screen Viewing Slot for Viewing Slot for the Source 1 Gate Source Drive Board Gate Drive Board GREEN LEDS ON THE GATE DRIVER BOARD ARE VIEWABLE THROUGH THIS SLOT INDICATE THAT THE STS IS ON SOURCE 1 GREEN LEDS...

  • Page 75: Bypass Procedures For Source 2

    To return to the normal mode: 1. Remove the key from CB5 and insert it in the CB1 breaker interlock. 2. Rotate key to retract interlock. 3. Close source input breaker CB1. 4. Verify the Source 1 and CB1 breaker status on the Mimic screen. 5.

  • Page 76: Normal System Shutdown

    To return to normal mode: 1. Insert the key in the CB2 breaker interlock. 2. Rotate the key to retract the interlock. 3. Close source input breaker CB2. 4. Verify Source 2 and CB2 breaker status on the Mimic screen. 5.

  • Page 77: Alarm And Faults

    11.0 A LARM AND AULTS Alarms and faults are events that are triggered when the operation of the static transfer switch falls outside of the defined parameters. These events can also be triggered by: user actions, such as changing configurations, clearing logs, etc.; failed components such as a fan failure, an SCR that is open or closed, etc.;...

  • Page 78: Event And History Logs

    See Event Masks on page 82 for instructions on setting the mask type via the touch screen display. See the 12.1.4 - Setting Event Masks with the Terminal on page 77 for instructions on config- uration using the RS-232 port. 11.2 Event and History Logs The system tracks events through the Events Log and tracks significant events through the His-...

  • Page 79: Alarm Notes

    The History Log has the following fields: • Replay Rate — indicates how long it takes for the replay to play. Use the UP and DOWN but- tons to set the time. • Status — the status of the STS2 at the point of the current frame in the replay. The History log has three statuses: Frozen, Not Frozen and Retrieving Data, please stand by.

  • Page 80: Table 9 Event Messages

    Table 9 Event Messages Alarm Message Description/Cause Action S1 SCR SHORT One or more of the SCRs for Source 1 have shorted and D, F, A, E failed. S2 SCR SHORT One or more of the SCRs for Source 2 have shorted and D, F, A, E failed.
  • Page 81 Table 9 Event Messages Alarm Message Description/Cause Action AUTO REXFER INHIBIT Automatic retransfer is inhibited. A, E CB1 (S1) OPEN Source 1, Circuit Breaker 1 is open. A, E CB2 (S2) OPEN Source 2, Circuit Breaker 2 is open. A, E CB4 (S1 BYP) CLOSED Source 1 on bypass, Circuit Breaker 4 is closed.

  • Page 82: 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 on page 47. This port is primarily used as an alternate user interface to configure, control, and diagnose the system, espe- cially for systems that do not include the HMI touch screen.

  • Page 83: Connecting And Using A Terminal

    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 termi- nal emulation software. If you are unsure of the cable pin out, see 15.2.10 - Terminal Port Connections on page 111.

  • Page 84: Configuring The Sts2 Via The Terminal

    Table 10 Terminal Commands Keys Function TIME Sets system time UPMDR? Displays metering data VER? Displays firmware versions 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 consists for four parameters: SPT [group] [item] [value] where the parameters are:...

  • Page 85: 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 Definition 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 86: Setting Bitpacked Options With The Terminal

    Table 12 Group Settings and Values Group Item: Description Value Type Value Notes Group 3: SRC1 Fast Undervoltage Integer In % of nominal below nominal User Setpoint Settings SRC1 Slow Undervoltage Integer In % of nominal below nominal Setpoint SRC1 Slow Undervoltage Integer In number of lines cycles Detect Delay...
  • Page 87 The value parameter settings are in the form of a bit-packed word (in hexidecimal notation). In other words, each bit indicates a particular setting for the option or feature. The bit assignments for the options and features are as follows: Options_1 bit0 —HasDualOutputBreaker bit1 —...

  • Page 88: Table 13 Binary-Hexidecimal Conversions

    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 |........| bit 15......bit 0 Since each bit represents a setting, a bit can be enabled or disabled: •...

  • Page 89: Setting Event Masks With The Terminal

    In hex this equates to (digits in the value parameter cannot have spaces between them): 0081 So your command to indicate that the Remote Source Selection and the Dual-Output Breaker are installed would be: SPT 2 6 0081 12.1.4 Setting Event Masks with the Terminal The event masks can be customized via a terminal.
  • Page 90 Communication Interfaces...

  • Page 91: Sts2 Touch Screen Display

    13.0 STS2 T OUCH CREEN ISPLAY The STS2 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. This screen provides a graphical (Mimic) display of the switch’s operation, plus system information including system parameters, alarms and faults.

  • Page 92: 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 provide information in the display panel.

  • Page 93: Security

    13.2.1 Security Because the STS2 Color Graphical Display provides access to various configuration and monitoring choices, a password or key lockout switch may be used to protect access to certain changes, includ- ing: • Change configuration settings. • Clear logs. •...

  • Page 94: Mimic Display

    13.3 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 status, source voltage and current readings, output power measurements, and active alarm mes- sages.

  • Page 95: Figure 40 Event Mask Dialog Box

    To set the event masks: 1. Access the Event Mask dialog box: a. Select CONFIG. b. Select EVENT MASK from the pop-up menu. The Event Mask dialog box is displayed. See Figure 40. 2. Select the mask settings for each fault and alarm. a.

  • Page 96: Figure 41 User Settings Dialog Box

    Figure 41 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 97: Figure 42 Source Set Points

    Figure 42 Source Set Points 2. Select 1 to configure the settings for Source 1. 3. Configure the settings using the keypad or dialog box that is displayed when you touch a button. Table 14 Set Point Parameters Button Range Default Comments Fast UV Setting (%)
  • Page 98 deviation setting is the allowable frequency variation from nominal (60.0 or 50.0 Hz) before activating the frequency deviation alarm. The frequency setting applies to both input sources. a. Configure this setting with a range of 0.1 – 3.0 Hz The default setting is 0.5 and the resolution is 0.1. b.
  • Page 99 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. System Settings The System Settings choice under the Config menu displays another pop-up menu with three choices: •...

  • Page 100: Figure 43 Comm Options Dialog Box

    Figure 43 Comm Options Dialog Box Option buttons 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 con- figure settings.

  • Page 101: Figure 44 Modem Dialog Box

    Figure 44 Modem Dialog Box 2. Select the type of modem that the STS2 will be using: • Select INT if the STS2 will be communicating via an internal modem. • Select EXT if the STS2 will be communicating via an external modem. 3.
  • Page 102 11. Configure the MODEM HEALTH CHECK. The Health Check verifies that the modem is working properly. This setting allows you to enable the check and set when it is run. a. Select the button to display the Modem Health Check dialog box, from which you can access further dialogs to set the time and days that the check is run.

  • Page 103: Figure 45 Input Contact Isolator Dialog Box

    Figure 45 Input Contact Isolator Dialog Box 2. Select INPUT CONTACT 1. A keyboard is displayed to allow you to enter the name of the alarm. 3. Enter the name of the alarm set for that input. For example, a fan problem could be indicated by naming the button FAN.

  • Page 104: Figure 46 Programmable Relay Board Dialog Box

    The STANDARD SET for the Programmable Relay Board settings are: Table 15 Standard Settings for Programmable Relays Relay Setting Definition SOURCE 1 FAIL Source 1 failure. SOURCE 2 FAIL Source 2 failure. BYPASS CB4 CLOSED Switch (CB4) is closed, Source 1 is bypassed. BYPASS CB5 CLOSED Switch (CB 5) is closed, Source 2 is bypassed.
  • Page 105 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 106: Figure 47 System Options

    Figure 47 System Options Dual Output Breaker This selection is set at the factory. The choice is set to YES to enable both output breakers (CB3 and CB3A) when two are installed in the unit. If only one output breaker (CB3) is installed, the setting is set to NO.

  • Page 107: Logs

    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 108: Source Transfers

    Figure 49 History Log 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: •...

  • Page 109: Help

    Display Panel. This same help is also available in 16.0 - Event Message Help Text on page 113. 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 110 STS2 Touch Screen Display...

  • Page 111: Operating The Led Display Sts2

    14.0 O LED D STS2 PERATING THE ISPLAY Certain models of the STS2 do not include the LCD Color Graphical Display with the touch screen interface. This display is replaced by an LED front panel to allow you to monitor the unit and alert you when a problem occurs.

  • Page 112: Event Controls

    Figure 50 Front Panel LEDs and Buttons (CB4) (STS1) (IN1B) (IN1A) (CB1) (SW_PREF1) (LED_PREF1) (NOXF) (CB3) (OUT) (CB3A) (SW_PREF2) (LED_PREF2) (IN2B) (IN2A) (STS2) (CB2) (CB5) Key: = Circuit Breaker 1 = Input Source 1 2 = Input Source 2 3 = Output = LED 3a = Output, dual system = Preferred Source Button and LED...

  • Page 113: Led Definitions

    14.1.3 LED Definitions The following table defines what item that these LEDs monitor: Table 16 LEDs—Defined Item Monitored Action IN1A Source 1 input present A green LED is lit if the Source 1 input power is present. This LED only indicates that power is present to the power supply;...

  • Page 114: Button Definitions

    Table 16 LEDs—Defined Item Monitored Action ALRM Alarms A red LED is lit when an alarm condition is present in the STS2. Connect a PC terminal to the STS2 to locate the exact cause. See Communication Interfaces for PC terminal commands. 14.1.4 Button Definitions The following table defines the buttons illustrated in Figure 50 and Figure 51.

  • Page 115: Operations

    14.2 Operations This section discusses the system turn-on, shut-down and bypass procedures for LED-based STS2. If your unit has an LCD touch screen, see 10.0 Operating Instructions for the Touch Screen Interface on page 58 for instructions these procedures. 14.2.1 Normal System Turn-On NOTE If your STS2 is connected to a PDU with a Wye configuration, enable the Wye Output Transformer before starting the system.

  • Page 116: Manual Transfer / Preferred Source Selection

    14.2.2 Manual Transfer / Preferred Source Selection The preferred source buttons allow you to change the preferred source. Transfers are only permit- ted when the voltage and current are within their proper operating range and the sources are syn- chronized. Transfer is inhibited if the deviation exceeds the parameter set in the Source Set Points. NOTE If one source will be de-energized for an extended period (hours or days), set the unit to bypass mode for the remaining source.
  • Page 117 4. Rotate and remove the interlock key. 5. Insert the key into the CB4 bypass breaker interlock. 6. Rotate interlock keys in the CB4 bypass breaker interlock to retract the interlock. 7. Close bypass breaker CB4. The LED for CB4 turns on. 8.

  • Page 118: Normal System Shutdown

    To return to normal mode: 1. Verify that the LEDs for Source 2 are on, indicating that the source is supplying power and is operating within acceptable tolerances. 2. Insert key in the CB2 breaker interlock. 3. Rotate key to retract interlock. 4.

  • Page 119: Specifications

    15.0 S PECIFICATIONS This section provides the specifications for the STS2. 15.1 System Configuration The STS2 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. These configu- rations apply to both units, the Color Graphical Display and an LED Display.

  • Page 120: Grounding

    15.1.4 Grounding Refer to 5.3 - System Grounding on page 15 for specifications and instructions regarding ground- ing. 15.1.5 Electrical Requirements Table 20 Electrical Requirements Item Requirement Maximum Continuous Current 100, 250, 400, 600, 800, 1000 amps Load Power Factor Range 0.75 to 1.0, leading or lagging Load Crest Factor Up to 3.5...

  • Page 121: System Components

    15.2 System Components All STS2 models provide two static transfer switches within one enclosure, with the ability to trans- fer 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 122: Access

    15.2.4 Access The STS2 is designed so all repairs and maintenance can be done from the front 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 unit. These components include: •...

  • Page 123: Color Graphical Display Or Led Display

    15.2.8 Color Graphical Display or LED Display The display is located in the front of the unit. Front panel display is either an LCD touch screen dis- play for monitoring and configuring the unit, or an LED panel to monitor the unit's status. See Figure 31 on page 49 for a drawing of the touch screen display.

  • Page 124: Interface Parameters

    15.2.11 RS-232 Interface Parameters The service terminal interface parameters are the following settings and cannot be changed. Table 25 RS-232 Settings Parameter Setting Interface RS-232 Using EIA Voltage Levels Baud Rate 9600 Parity None Number of Data Bits Number of Stop Bits Hardware Flow Control Terminator <CR>...

  • Page 125: Vent Essage Elp Ext

    Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
  • Page 126 Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
  • Page 127 Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
  • Page 128 Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
  • Page 129 Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
  • Page 130 Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
  • Page 131 Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
  • Page 132 Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
  • Page 133 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 134 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 135 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 alarm is latched and must be reset after the voltage returns to the nominal voltage. If the Reset option is not configured for AUTO (automatic reset), then the reset action must be done manually.
  • Page 136 If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. S1 OVERCURRENT Source 1 Overcurrent STS2 is running on Source 1 and an overload condition has occurred on one or more phases. Note: The overload setpoint is a single fixed number--101%.
  • Page 137 If this alarm is set for manual reset mode, the alarm continues to show as active after the current returns to nominal, still inhibiting transfers. You will need to manually reset the alarm. If configured to be a latching alarm, press RESET on the display.
  • Page 138 Pressing the RESET button to returns the unit to the preferred source. Ensure that the condition that triggered the switch has been rectified before returning to the preferred source. 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 The alarm has triggered a message to be sent to the modem, if so configured. If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. CB4 (S1 BYP) CLOSED Circuit Breaker 4 (Source 1 Bypass Breaker) Closed Circuit breaker 4 is not open.
  • Page 140 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. This event was written to the Event Log, if so configured. The alarm has triggered a message to be sent to the modem, if so configured.
  • Page 141 If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. OUTPUT UV Output Undervoltage The voltage being supplied to the load has dropped below the acceptable nominal voltage. Check the input voltage from both sources.
  • Page 142 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, with its assigned name, was written to the Event Log, if so configured. The alarm has triggered a message to be sent to the modem, if so configured.
  • Page 143 INPUT CONTACT #7 Input Contact Isolator #7 Occurrence of the indicated external event has been detected by Input Contact Isolator #7 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 144 If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. TIME REPROGRAMMED System Time Reprogrammed The system’s time setting has been updated and saved. Press SILENCE on the touch screen to turn off the audible alarm, if so configured.
  • Page 145 If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. HIST LOGS FULL History Logs Full The history buffer has reached its capacity for both history logs. No further history logs can be written until the logs are cleared.
  • Page 146 Event Message Help Text...

  • Page 147: Table 26 Torque Tightening

    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 148: Contacting Liebert

    17.4 Contacting Liebert To contact Liebert Global Services in the United States for information or repair service , call 1-800-LIEBERT (1-800-543-2378). Liebert Global Services is available to assure fast repair of your unit with minimal downtime. Liebert Global Services offers a complete range of start-up services, repair services, preventive maintenance plans, and service contracts.
  • Page 150 The Company Behind the Products Technical Support/Service Web Site With over a million installations around the globe, www.liebert.com Liebert is the world leader in computer protection Monitoring systems. Since its founding in 1965, Liebert has 800-222-5877 developed a complete range of support and monitoring@liebert.com...

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