Interruptor de transferencia automática, modelo ATS-NW. Interrupteur de transfert automatique,modèle ATS-NW

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1 Automatic Transfer Switch: Model ATS-NW Interruptor de transferencia automática, modelo ATS-NW Interrupteur de transfert automatique,modèle ATS-NW Instruction Bulletin Boletín de instrucciones Directives d'utilisation /2010 Retain for Future Use. / Conservar para uso futuro. / À conserver pour usage ultérieur.

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3 Automatic Transfer Switch: Model ATS-NW Class 2700 Instruction Bulletin /2010 Retain for future use.

4 ENGLISH Hazard Categories and Special Symbols Read these instructions carefully and look at the equipment to become familiar with the device before trying to install, operate, service or maintain it. The following special messages may appear throughout this bulletin or on the equipment to warn of potential hazards or to call attention to information that clarifies or simplifies a procedure. The addition of either symbol to a Danger or Warning safety label indicates that an electrical hazard exists which will result in personal injury if the instructions are not followed. This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death. DANGER DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING WARNING indicates a potentially hazardous situation which, if not avoided, can result in death or serious injury. CAUTION CAUTION indicates a potentially hazardous situation which, if not avoided, can result in minor or moderate injury. CAUTION CAUTION, used without the safety alert symbol, indicates a potentially hazardous situation which, if not avoided, can result in property damage. NOTE: Provides additional information to clarify or simplify a procedure. Please Note Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material.

5 Automatic Transfer Switch: Model ATS-NW 07/2010 Table of Contents Table of Contents Introduction... 7 Safety Precautions... 8 Receiving, Handling, and Storage... 8 Applications and Specifications... 8 Main-Main... 8 Main-Generator... 9 Operator Door Assembly Operating Mode Group: Main-Main Indicator Lights Preferred Source Selector (PSS) (Optional) Auto/Manual Keyed Switch Auto Retransfer (Optional) Operating Mode Group: Main-Generator Indicator Lights Exercise with Load (Optional) Auto/Manual Keyed Switch Generator Start/Stop Source and UPS Status Group Indicator Lights Test Transfer Switch Push-To-Test Button (Optional) Circuit Breaker Control and Status Group Indicator Lights Pushbuttons Control Power and Power Monitor Assembly Control Power Subassembly Power Quality Monitor Subassembly Generator Relay Subassembly Sync-Check Relay Assembly UPS Assembly Control Power Source Contactor UPS Bypass Relay UPS Unit Programmable Logic Controller (PLC) assembly Disconnects and Fuses Interposing Relays Remote Status Relay Subassembly Generator Start Relay Touch Screen Control Option General Information Touch Screens Main Screen Settings Screen PLC I/O Map Alarm Log (Optional) Event Log (Optional) Password Access Control Operation Control Settings Alarm and Event Logs (Optional) Mechanical Interlocking Cable Assembly Open Transition closed transition ENGLISH Schneider Electric All Rights Reserved 3

6 Automatic Transfer Switch: Model ATS-NW Table of Contents 07/2010 ENGLISH Operation Main-Main System Initial (Default) Setting Normal Source Lost Normal Source Returns PSS Off/ No PSS Option Normal Source Returns PSS On Alternate Source Lost Auto Retransfer (Optional) Main-Generator System Initial (Default) Setting Normal Source Lost Normal Source Returns Open Transition Normal Source Returns closed transition Generator Source Lost While Normal Source Is Out Exercise Period Conditions That Prevent Transfer of Source Downstream Fault Other Conditions Installation Preparation for Receiving Equipment Location and Interconnection of Assemblies Final Wiring Connections Installing the Equipment Checkout Before Energizing Performance Checkout Placing Into Service Test Procedures Main-Main Base System Manual Mode Automatic Mode Main-Main Standard Options Manual Mode Automatic Mode Main-Generator Base System Manual Mode Automatic Mode Main-Generator Standard Options Manual Mode Automatic Mode Troubleshooting and Maintenance Changing Fuses Checking Light Bulbs Without Push-To-Test Option With Push-To-Test Option Troubleshooting Chart List of Standard Values and Arrangements All Systems Generator Systems Connection to Circuit Breakers Connection to Circuit Breakers References Maintenance Log Schneider Electric All Rights Reserved

7 Automatic Transfer Switch: Model ATS-NW 07/2010 List of Figures List of Figures Figure 1: PLC Shown on Power-Style QED Switchboard... 7 Figure 2: Main-Main Configuration... 9 Figure 3: Main-Generator Configuration... 9 Figure 4: Operator Door Basic Main-Generator Configuration Figure 5: Operating Mode Group: Main-Main Figure 6: Operating Mode Group: Main-Generator Figure 7: Source and UPS Status Group Figure 8: Circuit Breaker Control and Status Group Figure 9: Generator Relay Subassembly Figure 10: Sync-Check Relay Assembly Figure 11: UPS Assembly Figure 12: Control Power Source Contactor Figure 13: UPS Bypass Relay Figure 14: UPS Unit Figure 15: PLC Assembly Figure 16: Disconnects and Fuses Figure 17: Interposing Relays Figure 18: Remote status relay Figure 19: Generator Start Relay Figure 20: Main Screen Figure 21: Settings Screen Figure 22: PLC I/O Map Screen Figure 23: Alarm Log Screen Figure 24: Event Log Screen Figure 25: Password Access ENGLISH Schneider Electric All Rights Reserved 5

8 Automatic Transfer Switch: Model ATS-NW List of Tables 07/2010 ENGLISH List of Tables Table 1: Manual Mode Test Procedures for Basic Main-Main Table 2: Automatic Mode Test Procedures for Basic Main-Main Table 3: Manual Mode Test Procedures for Main-Main with Options 30 Table 4: Automatic Mode Test Procedures for Main-Main with Options 31 Table 5: Manual Mode Test Procedures for Basic Main-Generator.. 32 Table 6: Automatic Mode Test Procedures for Basic Main-Generator.. 33 Table 7: Manual Mode Test Procedures for Main-Generator with Options Table 8: Automatic Mode Test Procedures for Main-Generator with Options Table 9: Troubleshooting Table 10: System Settings Table 11: System Configuration Table 12: Generator System Settings Table 13: Maintenance Log Table Schneider Electric All Rights Reserved

9 Automatic Transfer Switch: Model ATS-NW 07/2010 Introduction Introduction This instruction bulletin describes Main-Main and Main-Generator Square D brand automatic transfer switches for low voltage switchboards/switchgear. It is for use by installers and specifiers and describes standard systems. For installations that deviate from these standards, this bulletin provides basic information only. Standard systems always include an uninterruptible power supply (UPS). Options available are a preferred source selector switch, closed transition, and push-to-test lights. Refer to documentation supplied by the factory for any deviations to the standard system. This bulletin also describes a standard sequence of operation for the programmable logic controller (PLC) system. The standard sequence follows one of the topics in Operation on page 24 of this manual. The system is checked for proper sequence using one of the Test Procedures starting on page 28 of this instruction bulletin. Any changes to the standard sequence are documented in separate instructional materials provided by the factory. ENGLISH Figure 1: PLC Shown on Power-Style QED Switchboard Square D brand automatic transfer switches from Schneider Electric are designed to meet Underwriters Laboratories (UL) 1008 and to be applied on National Electrical Code (NEC ) 700, Emergency Systems. They are also applicable to NEC 701, Legally-Required Standby Systems and NEC 702, Optional Standby Systems. This transfer switch is suitable for control of motors, electric discharge lamps, tungsten filament lamps, and electric heating equipment where the sum of motor full-load ampere ratings and the ampere ratings of other loads do not exceed the ampere rating of the switch, and the tungsten load does not exceed 30 percent of the switch rating Schneider Electric All Rights Reserved 7

10 Automatic Transfer Switch: Model ATS-NW Safety Precautions 07/2010 ENGLISH Safety Precautions DANGER HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E. This equipment must only be installed and serviced by qualified electrical personnel. Turn off all power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Replace all devices, doors and covers before turning on power to this equipment. Failure to follow these instructions will result in death or serious injury. CAUTION HAZARD OF BODILY INJURY OR EQUIPMENT DAMAGE This manual contains general information about a standard design. It does not contain information about modifications to the standard design. Thoroughly review all documentation supplied by the factory for any deviations to the standard design. Contact your local Schneider Electric representative if you have any questions concerning the automatic transfer switch. Failure to follow these instructions can result in injury or equipment damage. Receiving, Handling, and Storage The automatic transfer switch is included as part of already-assembled equipment. Refer to the general equipment instruction bulletin for complete receiving, handling, and storage instructions for the equipment. Also refer to the programmable controller s user guide for additional environmental restrictions. Applications and Specifications Main-Main Automatic transfer switch systems minimize power interruption by transferring the load from the normal source to an alternate source when the normal source is temporarily unavailable. The system uses multiple connections to power sources (at least one of which is a utility) and a control system to achieve this transfer. This transfer system may be supplied with mounted or drawout circuit breakers, and is controlled by a Modicon programmable logic controller. These systems also feature redundant supplies of control power. Each main circuit breaker connects to a utility source. Either supply may be the emergency or alternate source. When the normal source becomes unavailable, the system transfers to the alternate source. If the system is equipped with a PSS option, the system reverts to the preferred source automatically once it is available. Without the selector, automatic retransfer does not occur. See Figure Schneider Electric All Rights Reserved

11 Automatic Transfer Switch: Model ATS-NW 07/2010 Applications and Specifications Figure 2: Main-Main Configuration Utility 1 Utility 2 ENGLISH Left main PLC Right main Common load Main-Generator One main circuit breaker connects to a utility source. The other main circuit breaker connects to a standby generator. Either main can be the emergency source. When power from the utility source is lost, the generator starts. Once both frequency and voltage stabilize, the system will transfer to the generator. The system reverts to the utility source automatically when it becomes available, and the generator start signal is discontinued. See Figure 3. Figure 3: Main-Generator Configuration Utility 1 Generator Left main PLC Right main Common load Schneider Electric All Rights Reserved 9

12 Automatic Transfer Switch: Model ATS-NW Applications and Specifications 07/2010 ENGLISH Operator Door Assembly The operator door features indicating lights, pushbuttons, and keyed switches used to interface with the control system. See Figure 4. The main-generator system features an additional generator switch. Except as noted, the keys may be removed in any position. The location of lights and switches may vary depending on equipment type and options included. The lights and switches will always be clearly labeled. NOTE: LED bulbs are not replaceable. If an LED has power to it, but does not illuminate, you must replace the LED module. Before replacing an LED module, first turn off all power to the automatic transfer switch. Do not remove the wires connected to an LED module while the switch is energized. Disconnecting the LED module with the power ON may cause a closed circuit breaker to open. Figure 4: Operator Door Basic Main-Generator Configuration Operating Mode Group: Main-Main The upper left-hand corner of the operator door features a two-position auto/manual keyed switch and three indicator lights. Two other optional keyed switches may be present. Figure 5: Operating Mode Group: Main-Main 1. White Indicator Light 2. Blue Indicator Light 3. Amber Auto Mode Fail Light 4. PSS Switch (Optional) 5. Auto/Manual Keyed Switch 6. Auto Retransfer Switch (Optional) Schneider Electric All Rights Reserved 6

13 Automatic Transfer Switch: Model ATS-NW 07/2010 Applications and Specifications Indicator Lights The white light (Figure 5, 1) indicates the system is in Automatic mode. The blue light (Figure 5, 2) indicates the system is in Manual mode. The auto/manual keyed switch determines the operating mode. The amber auto mode fail light (Figure 5, 3) indicates a system irregularity. The amber auto mode fail light illuminates under any of the following circumstances: Either drawout main circuit breaker (but not all) has been racked to the test or disconnect positions Either main circuit breaker has tripped while the system was in Automatic mode for a reason (such as ground fault) that prevents transfer of source A mechanical Open pushbutton has been pressed The internal diagnostics have detected an error ENGLISH Preferred Source Selector (PSS) (Optional) Auto/Manual Keyed Switch Auto Retransfer (Optional) The optional PSS (Figure 5, 4) is a three-position keyed switch that determines whether the left or right source is the normal source. The center position is the Off position The auto/manual keyed switch (Figure 5, 5) has two positions. Turn the key to: Auto for automatic operation. Man (manual) to use the pushbuttons on the operator door to control the system manually. The optional auto retransfer selector (Figure 5, 6) is a two-position keyed switch that determines the automatic retransfer mode. In the On position, retransfer occurs automatically after a source returns and becomes stable. In the Off position, the system remains in the transferred state after the source returns, allowing the user to manually initiate the retransfer at a more convenient time. Move the switch from the Off position to On to begin the transfer sequence. When transfer is complete, return the switch to the Off position, if automatic transfers are not desired. NOTE: If the auto retransfer switch is not supplied, all retransfers will be automatic Schneider Electric All Rights Reserved 11

14 Automatic Transfer Switch: Model ATS-NW Applications and Specifications 07/2010 ENGLISH Operating Mode Group: Main-Generator Figure 6: Operating Mode Group: Main-Generator 1. White Automatic Indicator Light 2. Blue Manual Indicator Light 3. Amber Auto Mode Fail Light 4. Exercise with Load Switch (Optional) 5. Auto/Manual Keyed Switch 6. Generator Start/Stop Switch The upper left-hand corner of the operator door features a two-position auto/manual keyed switch, a generator start/stop keyed switch, and three indicator lights. Optional keyed switches may be present Indicator Lights Exercise with Load (Optional) Auto/Manual Keyed Switch Generator Start/Stop The white light (Figure 6, 1) indicates the system is in Automatic mode. The blue light (Figure 6, 2) indicates the system is in Manual mode. The auto/manual keyed switch determines the operating mode. The amber auto mode fail light (Figure 6, 3) indicates a system irregularity. The amber auto mode fail light illuminates under any of the following circumstances: Either drawout main circuit breaker (but not all) has been racked to the test or disconnect positions. Either main circuit breaker has tripped while the system was in Automatic mode for a reason (such as ground fault) that prevents transfer of source. A mechanical Open pushbutton has been pressed. The internal diagnostics have detected an error. The optional exercise with load selector (Figure 6, 4) is a two-position keyed switch that determines whether the generator exercise will occur with or without load. The auto/manual keyed switch (Figure 6, 5) has two positions. Turn the key to: Auto for automatic operation. Man (manual) to use the pushbuttons on the operator door to control the system manually. A generator start/stop switch (Figure 6, 6) may be used to start the generator when the auto/manual switch is set to manual mode. The switch has two positions, Stop and Start. In Manual mode, turn to the Start position to send a start signal to the generator. Turn to the Stop position to shut the generator down. In Auto mode, the generator start/stop switch is ignored Schneider Electric All Rights Reserved

15 Automatic Transfer Switch: Model ATS-NW 07/2010 Applications and Specifications Source and UPS Status Group Figure 7: Source and UPS Status Group 1. White Source Light 2. Red CHK UPS OR PLC BATT light 3. Sources Synchronized Light (Optional) 4. Test Transfer Switch 5. Push-to-Test Button (Optional); Location of button shown for reference only The source and UPS status group, located in the upper right-hand section of the operator door, features a three-position keyed switch and three lights. Another keyed switch, an illuminated pushbutton, and/or an indicator light may also be present. See Figure 7. ENGLISH Indicator Lights Test Transfer Switch Push-To-Test Button (Optional) Each white Left Source or Right Source light (Figure 7, 1) illuminates when the corresponding source is available. The red CHK UPS OR PLC BATT light (Figure 7, 2) indicates that either the PLC or UPS battery needs service. The Sources Synched light (Figure 7, 3) is supplied only on closed transition applications. When the two sources are sufficiently similar in phase angle, magnitude, and frequency, this light illuminates indicating synchronization. The keyed test transfer switch (Figure 7, 4) has three positions: TTL (Test Transfer Left) Simulates a left source power loss causing a transfer to the right source. During proper operation, the left source light is off and the right source light is on. TTR (Test Transfer Right) Simulates a right source power loss causing a transfer to the left source. During proper operation, the right source light is off and the left source light is on. Normal Standard operating mode. The switch is in the Normal position when NOT simulating a source power loss. NOTE: The key can only be removed when it is in the Normal position. The optional push-to-test button (Figure 7, 5 (not shown)) tests the condition of the indicator lights, including illuminated pushbuttons. Press the button labeled Push-To-Test. Check all bulbs that do not illuminate. Replace bulbs as needed Schneider Electric All Rights Reserved 13

16 Automatic Transfer Switch: Model ATS-NW Applications and Specifications 07/2010 ENGLISH Circuit Breaker Control and Status Group Figure 8: Circuit Breaker Control and Status Group 1. Amber Fault Indicator Light 2. Green Open Illuminated Pushbutton 3. Red Closed Illuminated Pushbutton The circuit breaker control and status group, located on the lower half of the operator door, features a light and two illuminated push buttons for each circuit breaker Indicator Lights Pushbuttons Control Power and Power Monitor Assembly Control Power Subassembly Power Quality Monitor Subassembly The amber Fault indicator light (Figure 8, 1) illuminates when the circuit breaker trips as a result of a fault condition (e.g., long time, short time, instantaneous, or ground fault). Each circuit breaker has two illuminated pushbuttons: the green open light (Figure 8, 2) and the red closed light (Figure 8, 3). In Manual mode, use these buttons to open or close the circuit breaker to which they correspond. In Automatic mode, the Open and Close pushbuttons will not control the circuit breakers. The left source group is on the bottom left; the right source group is on the bottom right. Each utility or generator source provides power to the control power system through a 1000 volt-ampere control power transformer. The disconnecting means for control power and the power quality monitor is located within each main circuit breaker instrument compartment. The control power transformer (CPT) connects to source (line) side bussing of the main circuit breaker. To provide control power, the CPT transforms the line voltage to 120 volts or, if the system is already 120 volts, isolates the control circuit. Each power quality monitor constantly evaluates the line voltage for an under-voltage, phase imbalance, phase loss, or phase reversal condition. When the power quality monitor senses an abnormal condition, a voltage input alerts the PLC Schneider Electric All Rights Reserved

17 Automatic Transfer Switch: Model ATS-NW 07/2010 Applications and Specifications Generator Relay Subassembly This subassembly is present only when one of the main circuit breakers is connected to a generator instead of a utility source. The subassembly contains an overvoltage relay (Figure 9, 1) and an over/under frequency relay (Figure 9, 2). The relays outputs are in series with the power quality monitor s outputs and indicate to the PLC that the generator source is available for use. The relays settings are adjustable. Refer to the relay manuals for details. ENGLISH Figure 9: Generator Relay Subassembly 1. Overvoltage Relay 2. Over/Under Frequency Relay 1 2 Sync-Check Relay Assembly The sync-check relay assembly is located in a main circuit breaker section if the automatic transfer switch is a closed transition system. The sync-check relay is shown in Figure 10. It compares A phase voltages from each source, and closes a contact when both are sufficiently similar in phase angle, magnitude, and frequency. The closed contact provides a voltage input to the PLC to indicate that the power sources are in phase. The sync-check relay is located in one section only. Figure 10: Sync-Check Relay Assembly Schneider Electric All Rights Reserved 15

18 Automatic Transfer Switch: Model ATS-NW Applications and Specifications 07/2010 ENGLISH UPS Assembly The uninterruptible power supply (UPS) assembly consists of three main parts: the UPS, UPS bypass relay, and the control power source contactor. Power flows from one control power subassembly through the control power source contactor, then through the UPS, and out to the control system. Figure 11: UPS Assembly Control Power Source Contactor The line side of each main circuit breaker provides power to the control power transformers. The control power source contactor directs power to the UPS from an available utility or generator source. When two sources are available, either source may be the control power source. Mechanical interlocking of the contactor keeps the sources from paralleling through the control power circuit. Figure 12: Control Power Source Contactor Control power source contactors UPS Bypass Relay The UPS bypass relay activates automatically to bypass the UPS to maintain the power flow to the control power system when the UPS is not functioning properly. Figure 13: UPS Bypass Relay UPS bypass relay Schneider Electric All Rights Reserved

19 Automatic Transfer Switch: Model ATS-NW 07/2010 Applications and Specifications UPS Unit During normal operation, control power goes through the UPS, which acts as a voltage regulator for the control circuit. When neither the normal nor the alternate source are available, the UPS provides control power from its battery for a limited time. The UPS owner s manual provides details about its load capability. The UPS battery will eventually require service. The CHK UPS OR PLC BATT light on the operator door will indicate when one of the batteries needs service. The Low Batt LED on the UPS will also illuminate when the UPS battery becomes inoperative. The Low Batt LED on the PLC will illuminate when the PLC battery needs to be replaced. ENGLISH Figure 14: UPS Unit UPS unit Programmable Logic Controller (PLC) assembly The programmable logic controller assembly is located behind the operator door and contains the PLC central processing unit (CPU), PLC power supply, and input/output (I/O) modules. The interposing relays and some terminal blocks are located here, as well. See Figure 15. Figure 15: PLC Assembly Schneider Electric All Rights Reserved 17

20 Automatic Transfer Switch: Model ATS-NW Applications and Specifications 07/2010 ENGLISH Disconnects and Fuses The control power disconnects (Figure 16, 1) for the transfer switch system have over amped fusing (Figure 16, 2) to provide short circuit protection only per UL 1008 Section DO NOT replace these fuses with lower ampere rating. NOTE: The DIN-rail mounted fuse blocks, (Figure 17, 3) used throughout the control power system, contain slugs and are used for troubleshooting the control system. DO NOT replace these slugs with fuses. Figure 16: Disconnects and Fuses 2 1 Interposing Relays The PLC outputs use Square D brand, Type R interposing relays to open circuit breakers and to give an optional remote status contact. See Figure 17. These relays are also used as part of an electrical interlock circuit which activates when the PLC is offline for any reason. Figure 17: Interposing Relays 3 Interposing relays Schneider Electric All Rights Reserved

21 Automatic Transfer Switch: Model ATS-NW 07/2010 Applications and Specifications Remote Status Relay Subassembly This is an interposing relay on the PLC pan that closes a set of contacts when the PLC falls out of Automatic mode and enters Automatic-Fail mode. See Figure 18. The relay is wired to terminal blocks on the UPS assembly for customer connection points. Spare contacts, both normally open and normally closed, are provided at the relay. Figure 18: Remote status relay ENGLISH Remote status relay Generator Start Relay The generator start relay is an off-delay timer relay. See Figure 19. The relay is normally energized by an output from the PLC. When the generator source is required, the PLC output goes low to de-energize the relay and close the generator start contact. In the event of total loss of control power (or if power to the PLC is disconnected), the relay will revert to its de-energized state to send a generator start signal via the same start contact. Figure 19: Generator Start Relay Schneider Electric All Rights Reserved 19

22 Automatic Transfer Switch: Model ATS-NW Applications and Specifications 07/2010 Touch Screen Control Option ENGLISH General Information The PLC control scheme can be equipped with an optional touch screen that replaces most of the door-mounted mechanical operators. The touch screen is available for the main-main and main-generator configurations. The auto/manual mode switch and generator start switch hardware will remain on the switchboard/switchgear to allow for manual control in the event that the touch screen does not work. These operators will allow the PLC to be switched to manual mode for generator starting and circuit breaker control via pushbuttons on the circuit breaker faceplates. The touch screen provides the following features: 1. Personnel can set password-protected time delays from the touch screen. There will be no requirement for laptop computers, complicated online PLC program changes, specialized software, or cables. 2. Alarm conditions will contain specific information instead of being limited to a general summary alarm. 3. Optional event logging with time and date stamp is available. This feature allows personnel to track when and why transfers occurred. 4. Two levels of password protection are available to limit personnel access. This will ensure that only authorized personnel can access control buttons and switches for transfer operations. A second level of password protection will allow adjustment of time delays and password administration. 5. The display is backlit, which allows for manual operation in low ambient light conditions. Touch Screens Main Screen The touch screens available are: Main Settings Programmable Logic Controller Input/Output (PLC I/O) Map Sequence of Operation Alarm Log (optional) Event Log (optional) NOTE: The screen pictures on pages are typical for main-main and main-generator applications. The main screen contains system status indicators, circuit breaker control buttons, system control switches, password access button, date and time display, and screen access buttons. See Figure 20. Figure 20: Main Screen Schneider Electric All Rights Reserved

23 Automatic Transfer Switch: Model ATS-NW 07/2010 Applications and Specifications Settings Screen The settings screen contains touchpads for changing delay and timer settings, time and date settings, access to touch screen system configuration, and password administration. See Figure 21. Figure 21: Settings Screen ENGLISH PLC I/O Map The PLC contains input/output (I/O) lists with indicators for status. See Figure 22. Figure 22: PLC I/O Map Screen Alarm Log (Optional) The alarm log contains a running list of alarms generated by system events (i.e., circuit breaker faults, circuit breaker connection status, auto fail mode, etc.). See Figure 23. Figure 23: Alarm Log Screen Schneider Electric All Rights Reserved 21

24 Automatic Transfer Switch: Model ATS-NW Applications and Specifications 07/2010 ENGLISH Event Log (Optional) The event log contains a running list of system events (i.e., switch activation, circuit breaker status, etc.). See Figure 24. NOTE: When power is turned on, the touch screen will be illuminated before the PLC goes into run mode for about 10 sec. Press the X in the lower right corner of the touch screen to close that window and allow visibility of all functions. Figure 24: Event Log Screen Password Access The main screen displays the image of a closed padlock in the lower left corner. See Figure Touch the padlock image to call up a touchpad for numeric data entry. 2. Enter the level 1 password (default 1234) to unlock access to the control switches and pushbuttons. 3. Use the required level 2 password (default 4321) to unlock the settings screen and to allow all level 1 functionality. 4. Touch the enter key to return to the main screen after entering the appropriate password. If the correct password was entered, the screen will display an unlocked padlock image with the active password level of 1 or Touch the push-to-lock touch pad to re-locked the system at any time. Figure 25: Password Access Schneider Electric All Rights Reserved

25 Automatic Transfer Switch: Model ATS-NW 07/2010 Applications and Specifications The password access mode will eventually time out and automatically re-lock (as indicated by a return to the locked padlock image). The duration of the password security timer can be adjusted on the settings screen. Passwords also can be changed on this screen. NOTE: If the password(s) is forgotten, a back-door access password (32767) can be entered for level 2 access. 1. Call up the settings screen, and a new button appears which allows a password override. 2. Touch the password override button to call up a screen that allows both the level 1 and level 2 passwords to be viewed and/or reset. ENGLISH Control Operation Control Settings Alarm and Event Logs (Optional) Enter the level 1 password to access control switches and pushbuttons on the main screen. Simply touch a pushbutton to activate it. To change a switch position, touch the switch. A popup window appears presenting additional touchpads for each switch position. Touch the desired switch position which closes the popup window and activates the switch. Help screens are available for each switch. Access the help screen by touching the? touch pad on the switch popup screen. Popup screens can be closed by touching the red X in the upper right corner, touching the desired function or touching an OK button. NOTE: The auto/manual mode switch and generator start switch are not located on the touch screen, but are on the equipment next to the touch screen. 1. Enter the level 2 password to access the settings screen. 2. Touch a time value to enter a new value on a popup numeric keypad. 3. Access help screens by touching the? touch pads near the setting in question. 4. Access time and date settings by touching the PLC Time Set or PLC Date Set button. 5. Adjust time and date settings by touching the up or down arrows that appear above and below the desired value. NOTE: The touch screen has its own date/time function that will not control the PLC date/time. Consult the touch screen instructions for other functions not covered here, such as backlighting levels. Enter the level 1 password to view these screens if supplied. Events appear on a summary list with the most recent occurrences near the top. Active events/alarms are displayed as red, acknowledged items appear yellow, and events/alarms that have returned to normal are displayed as green. NOTE: Pressing the acknowledge all events button will change event status from red to yellow Schneider Electric All Rights Reserved 23

26 Automatic Transfer Switch: Model ATS-NW Applications and Specifications 07/2010 ENGLISH Mechanical Interlocking Cable Assembly Open Transition A cable assembly provides mechanical interlocking between the two main circuit breakers used in the automatic transfer switch to prevent closed transition. Both circuit breakers may be open, but only one may be closed at a time. Refer to the Mechanical Interlocking Kit instruction bulletin for installation and calibration instructions, if these cables were not factory installed. closed transition There is no mechanical interlocking between the two main circuit breakers for closed transition switch systems. Operation Main-Main System Initial (Default) Setting Normal Source Lost Normal Source Returns PSS Off/ No PSS Option Normal Source Returns PSS On Alternate Source Lost Auto Retransfer (Optional) Main-Generator System This section describes the Automatic operation mode of the automatic transfer switch scheme provided for a main-main or two utility system. Either the left or right main circuit breaker can be the normal or emergency source. The default setting is one main circuit breaker (designated normal ) closed and one main circuit breaker (designated alternate ) open. The left circuit breaker is the normal circuit breaker unless otherwise specified, either when initially ordered or by the PSS position. If the normal source is lost, the PLC automatically transfers the load to the alternate source. The normal circuit breaker opens after the open delay. After the close delay, the alternate circuit breaker closes. Without the PSS option, or if the PSS is Off, the system will remain in the transferred state, even after the normal source returns. The alternate circuit breaker will remain closed until manual intervention (or the alternate source is lost), allowing the user to schedule retransfer at a convenient time. If the PSS is On, In an open-transition system, after the source stabilization delay, the alternate circuit breaker opens. After the close delay, the normal source closes. In a closed transition system, after the source stabilization delay, if the sync-check relay is satisfied, the normal circuit breaker closes. Two seconds later, the alternate circuit breaker opens. If the sync-check relay is not satisfied, retransfer will be delayed until the sources are synchronized. If the alternate source is lost while the normal source is out, the alternate source circuit breaker will open. The breaker associated with the first returning source will close after the source stabilization delay. If equipped with the auto retransfer switch: With the switch in the Off position, the user controls the transfer manually. With the switch in the On position, the transfer will occur automatically. This section describes the Automatic operation mode of the automatic throwover scheme for a system with one connection to a utility source and another to a generator Schneider Electric All Rights Reserved

27 Automatic Transfer Switch: Model ATS-NW 07/2010 Applications and Specifications Initial (Default) Setting Normal Source Lost Under normal circumstances, the main circuit breaker connected to the utility is closed and the main circuit breaker attached to the generator is open. Unless otherwise specified, the utility source is the left circuit breaker and the generator breaker is on the right. The system automatically transfers the load to the alternate source. The Normal circuit breaker opens after the Open Delay, and the start signal goes out to the generator. The alternate circuit breaker closes 10 seconds after the automatic throwover system s generator relays are satisfied, indicating both voltage and frequency are within desirable limits. ENGLISH Normal Source Returns Open Transition Normal Source Returns closed transition Generator Source Lost While Normal Source Is Out Exercise Period Conditions That Prevent Transfer of Source Downstream Fault Other Conditions After the source stabilization delay has expired, the system will retransfer to the normal source in an open transition sequence. First, the generator circuit breaker opens. After the close time delay, the normal circuit breaker will close. The generator will run in an unloaded state for 15 minutes to allow for cool-down. After the source stabilization delay has expired, the system will retransfer to the normal source in a closed transition sequence. If the sync-check relay is satisfied, the normal circuit breaker closes, and after two seconds the generator circuit breaker opens. The generator will run in an unloaded state for 15 minutes to allow for cool-down. If the sources are not synchronized, retransfer will be delayed until the sources are synchronized. If the alternate (generator) source is lost while the normal source is out, the alternate source circuit breaker will open. The circuit breaker associated with the first returning source will close after the source stabilization delay. Every Sunday at 1:00 p.m., a start signal will be sent to the generator for 30 minutes. The exercise period may be loaded or unloaded if equipped with the optional exercise with load selector switch. If exercise with load is selected, a transfer to the generator source will occur during the exercise period. If a main circuit breaker trips as a result of a downstream fault, electrical interlocking does not allow either device to close. In Manual mode, the Close pushbuttons are locked out. In Automatic mode, closure is not allowed. A tripped circuit breaker also activates the amber Auto Fail light. Automatic transfer does not occur until the fault is cleared and the circuit breaker is reset. Refer to the circuit breaker literature for instructions on how to reset the auxiliary contacts. To reset the automatic transfer switch, turn the auto/manual switch to Manual and back to Auto. Phase imbalance, phase reversal, or source voltage that exceeds limits (including total loss of voltage) will de-energize the power quality monitor, not allowing the associated main circuit breaker to close. A generator source is also monitored for overvoltage and proper frequency Schneider Electric All Rights Reserved 25

28 Automatic Transfer Switch: Model ATS-NW Installation 07/2010 Installation ENGLISH Preparation for Receiving Equipment The automatic transfer switch is contained in several switchboard or switchgear sections. See the switchboard or switchgear manual for general information pertinent to the equipment sections. The Modicon PLC has environmental restrictions different from that of the equipment as a whole. These restrictions can be found in the Modicon PLC User s Guide. Be sure to store and install the equipment in accordance with the tighter restrictions. For example, if the Modicon central processing unit (CPU) has temperature limits of F (0 60 C ), and the equipment has limits of F (0 75 C), then keep the equipment between F (0 60 C). Location and Interconnection of Assemblies Final Wiring Connections Installing the Equipment Checkout Before Energizing The parts of the automatic transfer switch are distributed among several switchboard or switchgear sections and must be wired together. Refer to the factory-supplied drawings shipped with the equipment for exact locations and subassembly interconnections. As previously noted, the parts of the automatic transfer switch system are distributed among several equipment sections and must be wired together. Some terminal blocks may be near the bottom of the front or rear corner channels. Refer to the wiring diagrams furnished with the switchboard or switchgear to confirm all wiring connections. 1. For a generator system, connect the external wiring on terminal blocks GEN 1 and GEN 2. The wiring must be run in conduit. 2. For remote status indication, connect the external wiring on terminal blocks AL 1 and AL 2 on the UPS assembly. 3. Complete all wiring between the sections for the control power and signals. The terminal blocks are typically located at the bottom of the front or rear corner channels of each section. The control power system has two or more disconnects. 1. Use the mechanical Open button on each circuit breaker to open the mains. 2. Turn the auto/manual switch on the operator door to the Manual position. 3. Turn all load (distribution) devices off. 4. Turn all control power disconnects to the On position. 5. Close and secure all covers and doors Schneider Electric All Rights Reserved

29 Automatic Transfer Switch: Model ATS-NW 07/2010 Installation Performance Checkout DANGER HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E. This equipment must only be installed and serviced by qualified electrical personnel. The control circuit and bus work are energized during the performance tests. Thoroughly review the equipment drawings, documentation, and design before starting any performance testing. ENGLISH Failure to follow these instructions will result in death or serious injury. Placing Into Service Follow the checkout procedures in the Installation and Maintenance documentation for the equipment. 1. Energize the equipment. 2. Turn on the uninterruptible power supply (UPS) that is supplied with the equipment. 3. Complete the appropriate test of the Manual mode as described for the installed system in the Test Procedures section of this bulletin, beginning on page Complete the appropriate test of the Automatic mode as described for the installed system in the Test Procedures section of this bulletin, beginning on. 5. Complete any steps for installed devices, including circuit breaker tests, ground fault tests, or metering circuit checkout as described in the appropriate documentation. Place the automatic transfer switch system into service after satisfactory completion of the Performance Checkout on page 27 and all outlined tests. 1. Open or close the main circuit breakers to the desired initial condition using the automatic transfer switch operator door switches. 2. Position all switches on the operator door to the desired positions. 3. Remove the keys from the keyed switches, and store in a secure but accessible location Schneider Electric All Rights Reserved 27

30 Automatic Transfer Switch: Model ATS-NW Installation 07/2010 ENGLISH Test Procedures Before beginning any test procedure, complete the installation steps outlined in Checkout Before Energizing on page 26. Identify the system type (main-main or main-generator), and whether the system has options (PSS or closed transfer), to select correct test procedure set. Complete the tests as outlined in Performance Checkout on page 27. Perform the appropriate tests for Manual and Automatic modes quarterly. Record test dates and results in the Maintenance Log on page 40. NOTE: This bulletin is for use by installers and specifiers and describes standard switches. For installations that deviate from these standards, this bulletin provides basic information only. Standard systems always include a uninterruptible power source (UPS). Options available are a PSS switch, exercise with load, auto-retransfer and, push-to-test pushbuttons. Refer to the documentation supplied by the factory for any deviations to the standard system. Additionally, this bulletin describes a standard sequence of operation for the switch. The standard sequence follows one of the Operation sections beginning on page 24 of this manual. The switch is checked for proper sequence using one of the Test Procedures in the Installation section of this bulletin. Any changes to the standard sequence are documented in separate instructional materials that are provided by the factory. Main-Main Base System Manual Mode This section covers testing recommended for a two-utility system when no options are installed. With the switch in Manual mode, an operator can open and close each circuit breaker independently using the pushbuttons on the operator door. Only one main circuit breaker may be closed at a time, avoiding closed transition. A two-second delay occurs between opening one main and closing the other. Table 1: Manual Mode Test Procedures for Basic Main-Main 1. Complete the following: 2. Verify that the following lights are on: 3. Verify that the following lights are off: Press the red Left Main Close pushbutton on the operator door. Open the left main circuit breaker using the green Open pushbutton on the operator door. After two seconds, press the red Right Main Close pushbutton on the operator door. Turn the auto/manual switch to the Manual position. Open both main circuit breakers with the mechanical Open button located on the circuit breakers. Turn the TTL/Normal/TTR switch to the Normal position. White Left Source light White Right Source light Green Left Main Open light Green Right Main Open light Blue Manual Mode light Amber Left Main Fault light Amber Right Main Fault light White Auto Mode light Green Left Main Open light will turn off Red Left Main Closed light will turn on Red Left Main Closed light will turn off Green Left Main Open light will turn on Green Right Main Open light will turn off Red Right Main Closed light will turn on Open the right main circuit breaker using the green Red Right Main Closed light will turn off Open pushbutton on the operator door. Green Right Main Open light will turn on NOTE: If the pushbutton to close one main circuit breaker is pressed while the other main circuit breaker is closed, the input is ignored Schneider Electric All Rights Reserved

31 Automatic Transfer Switch: Model ATS-NW 07/2010 Installation Automatic Mode Table 2: Automatic Mode Test Procedures for Basic Main-Main 1. Complete the following: 2. Verify the following lights are off: The operator door pushbuttons will not operate the circuit breakers in Automatic mode. Turn the auto/manual switch to the Manual position. Open both main circuit breakers with the mechanical Open button located on the circuit breakers. Turn the TTL/Normal/TTR switch to the Normal position. Amber Auto Fail light Amber Left Main Fault light Amber Right Main Fault light 3. Verify the following lights are on: White Left Source light White Right Source light Blue Manual Mode light 4. Turn the auto/manual switch to Auto. Normal source main circuit breaker will close 5. Verify the following lights are on: 6. Verify the following lights are off: White Auto light Red Normal Closed light Green Alternate Open light Amber Auto Fail light Amber Left Main Fault light Amber Right Main Fault light Simulate a loss of the normal source by turning the TTL/Normal/TTR switch to TTL (Test Transfer Left) or TTR (Test Transfer Right), whichever is the normal source. The normal main circuit breaker will open after the Open Delay. The Close Delay begins timing once the normal circuit breaker opens. After the Close Delay has timed out, the alternate source main circuit breaker will close. Verify the following lights are on: NOTE: The light for the normal source will be off. Green Normal Open light Red Alternate Closed light White Alternate Source light Simulate normal source voltage return by turning the TTL/Normal/TTR switch back to the Normal position. The alternate main circuit breaker will continue to power the load, but the normal source light will be on. Simulate a loss of the alternate source by turning the TTL/Normal/TTR switch to TTL (Test Transfer Left) or TTR (Test Transfer Right), whichever is the alternate source. The alternate main circuit breaker will open after the Open Delay. The Close Delay begins timing once the alternate circuit breaker opens. After the close delay has timed out, the normal source main circuit breaker will close. Green alternate Open light Verify the following lights are on: Red normal Closed light White normal Source light NOTE: The source light for the alternate source will be off. Simulate alternate source voltage return by turning the TTL/Normal/TTR switch back to the Normal position. The normal main circuit breaker will continue to power the load, but the alternate source light will be on. ENGLISH Schneider Electric All Rights Reserved 29