ASCO 7000 Series Power Transfer Switches

ASCO 7000 Series Overview

As modern infrastructure becomes increasingly dependent on consistent electrical power, interruptions can lead to significant financial losses and safety hazards. ASCO Power Technologies offers state-of-the-art solutions designed to reliably transfer critical loads to emergency sources. The 7000 Series represents the difference between minor inconvenience and major catastrophe, ensuring protection wherever critical loads exist.

The 7000 Series offers flexibility to meet diverse application requirements, including distributed generation. It is available in open, delayed, closed, and closed soft load configurations. Options for switched or overlapping neutrals enhance the reliability of ground fault protection systems and reduce voltage transients during unbalanced load switching. ASCO Power Transfer Switches are recognized as the first CE Marked, IEC 60947-6-1 compliant transfer switches globally.

Protecting:

• Healthcare Facilities
• Web Hosting, Internet Data Centers
• Commercial Buildings | Industrial Buildings
• Telecom Central Offices
• Process Manufacturing
• Distributed Power | Load Management

Switching Configurations

The ASCO 7000 Series is the industry standard, featuring a reliable, field-proven solenoid operating mechanism for high-speed load transfer. Combined with a programmable microprocessor controller, keypad, and LCD display, these switches offer advanced load transfer capabilities for various loads like motors, electronic drives, UPS systems, and microprocessor-based systems. They are available open or enclosed, in ampacity sizes from 30 to 4000 Amperes, with extensive accessory options. All configurations can include an integrally mounted bypass-isolation switch and are suitable for service entrance applications.

Product Features:

• Conventional two-position transfer, plus closed and delayed transition modes. Available in automatic or non-automatic control.
• UL 1008 and CSA 22.2 No.178-1978 listed.
• IEC 60947-6-1, CE marked (optional, limited accessories).
• Rated up to 600 VAC, 30 to 4000 Amperes.
• Reliable solenoid operating mechanism.
• High withstand and close-on ratings for circuit breaker coordination (600-4000 Amperes).
• Solid, switched, or overlapping neutral conductor options.
• Front replaceable contacts (800-4000 Amperes).
• Programmable microprocessor controller with keypad and LCD.
• Centralized terminal block for customer control connections (260-4000 Amperes).
• 16mm industrial grade control switches and indicating lights.
• Switch position LED indicators and source acceptability lights.
• Standard ground conductor connections.
• Four auxiliary contacts.
• Local/remote communications for ASCO POWERQUEST® integration.
• Comprehensive warranty.

Closed Transition Transfer Switching

ASCO Automatic Closed Transition Transfer Switches feature overlapping main contacts for seamless load transfer without power interruption. They operate in a make-before-break mode when sources are within acceptable parameters. Control logic monitors source conditions to determine open (conventional) or closed transition. Available from 150 to 4000 Amperes. Closed transition within 5 electrical degrees is achieved passively, without engine generator set control, simplifying wiring. Protective relaying may not be required due to overlap times under 100 milliseconds. Failure to synchronize indication and extended parallel time protection are built-in.

Figure 2: Depicts a four-pole, Closed Transition Transfer Switch rated 1000 Amperes in a Type 1 enclosure.

Delayed Transition Transfer Switching

Designed for applications with older variable frequency drives, rectifier banks, and load management, these switches provide a timed load disconnect position for an adjustable period. Available from 150 to 4000 Amperes. Features include reliable solenoid mechanisms, mechanical interlocks, an indicator light for load disconnect position, and adjustable time delay.

Figure 3: Shows a four-pole, Delayed Transition Transfer Switch rated 2000 Amperes.

Non-Automatic Transfer Switching

Electrically operated units controlled by manual switches, locally or remotely. Available from 30 to 4000 Amperes. Features include a microprocessor-based controller for optional accessories, protection against inadvertent operation under low voltage, low control circuit currents for long line runs, source acceptability lights, and an optional inphase monitor for motor load transfer.

Figure 4: Illustrates a three-pole Non-Automatic, electrically operated 400 ampere switch in a Type 1 enclosure.

Withstand and Close-On Ratings for all 7000 Series Products (RMS Symmetrical Amps) are detailed in a comprehensive table, providing specific ratings for various switch configurations, frames, and current limiting fuses.

Automatic Transfer Bypass-Isolation Switches

ASCO Automatic Transfer & Bypass-Isolation Switches are available in open, closed, and delayed transition designs. The bypass and isolation features allow for inspection, testing, and maintenance of the primary automatic transfer switch without interrupting power to the load. They also provide redundant power transfer if the ATS is disabled or removed from service.

Key Features:

• Available from 150 to 4000 Amperes.
• Allows bypass-isolation without load interruption.
• Bypass switch and transfer switch share identical electrical ratings.
• Heavy-duty mechanical interlocks prevent undesirable operation.
• Bypass contacts carry current only during bypass mode.
• Drawout design for ease of maintenance.
• Permanently mounted bypass and isolation handles with dead front quick-make, quick-break operation.
• Bypass switch functions as a manual 3-position transfer switch.
• Simple operation requiring two handles.
• Mechanical indicators display switch positions.
• 800-1200 ampere models available in shallow depth, front or rear connected designs.

Figure 5-8: Show examples of ASCO Automatic Transfer & Bypass-Isolation Switches across various current ratings.

Transfer Switch Drawout Features (150-4000 Amperes)

These features enhance maintenance and safety:

• Automatic secondary disconnects remove control power when the switch is withdrawn.
• Drawout carriage facilitates easy maintenance and removal using commercially available breaker hoists.
• Optional transfer switch lifting yoke kit available.
• Optional automatic shutters close when the switch is withdrawn, providing bus isolation (specify accessory 82C for 1600-4000A models).

Figure 9: Illustrates the Bypass-Isolation Transfer Switch secondary disconnects and optional automatic shutters.

Figure 10: Shows the self-aligning power jaws of the Bypass-Isolation Transfer Switch.

Bypass and Isolation Handles - Simple as 1, 2, 3

The operation of bypass and isolation handles is a straightforward three-step process:

1. Bypass to Normal: Push in the bypass handle and turn it counter-clockwise. The bypass switch closes to the normal source.
2. Test Position: Turn the isolation handle counter-clockwise until the window displays "Test". This keeps the control panel energized for electrical operation testing.
3. Isolation Position: Continue turning the isolation handle counter-clockwise until the window displays "Isolate". This disconnects the switch.

Figure 11: Shows the Transfer Bypass Status Panel with LED indicators.

Figure 12: Depicts the Bypass-Isolation Switch user interface, including the mechanical handle position window.

Service Entrance Power Transfer Switches

ASCO Service Entrance Power Transfer Switches integrate automatic power switching with a utility source disconnect and overcurrent protection. They meet National Electric Code requirements for main utility service entrances, ideal for facilities with a single utility feed and emergency source. A circuit breaker acts as the utility disconnect, with links provided to disconnect neutral and ground connections.

These products are UL 1008 or UL 891 listed and are available up to 600V and 4000A in Standard, Delayed, Closed Transition, Soft Load, and Bypass Isolation configurations.

Figure 13: Illustrates the ground and neutral disconnect links.

Standard Features:

• Available from 150 to 4000 Amperes.
• ASCO 7000 SERIES Power Transfer Switch is UL 1008 Listed.
• Standard UL Type 1 Enclosure.
• Disconnect and overcurrent protective device on the utility source: molded case circuit breaker (150 to 2000 Amp) or insulated case (3000 to 4000 Amp).
• Disconnect link on Neutral.
• Disconnect link on Ground.
• Ground and Neutral Bus, all silver-plated copper.
• Solderless screw type terminals for external power connections.
• Meets all NEC requirements for service entrance use.
• Internet enabled monitoring and control.
• Service entrance breakers are rated: 100% for 1000 Amps and above; 80% below 1000 Amps for bypass switches; 100% for 2500 Amps and above; 80% below 2500 Amps for standard transfer switches.

A one-line diagram illustrates a typical service entrance rated transfer switch configuration (Solid, Switched, or Overlapping Neutral). Ground fault trip protection is provided on sizes of 1000 Amperes and above.

Optional Features:

• Enclosures: Secure Double Door (UL Type 3R w/strip heater & thermostat, UL Type 4 or 4X, UL Type 12).
• Connections: Crimp lugs, Bus Riser on Normal, Emergency or Load.
• Protective Relays/Metering: Accessory 85L (see page 15).
• Surge Suppression: Accessory 73, Surge protector (see pg. 14).
• ASCO POWERQUEST® products: (see pages 16-21) including 72E Ethernet Connectivity module, 5310/5350 Remote annunciators, 5400 Power Quality Meters.
• Additional Breaker(s): Circuit Breaker on Emergency, Load Distribution Panel.
• Optional high AIC ratings on breakers.

Ordering Information

To order an ASCO 7000 SERIES Service Entrance Power Transfer Switch, a catalog number is completed by selecting options for Product, Neutral Code, Phase Poles, Amperes, Voltage Code, Grp Code, and Enclosure. An example catalog number is provided: 7AUSA3400N5XC.

Detailed tables provide Dimensions and Weights for non-bypass configurations (Type 1 and 3R Enclosures) and shipping weights for 2-Position, Closed Transition, Delayed Transition, and Bypass-Isolation Switching configurations. These tables specify switch ratings, frame sizes, enclosure dimensions (width, height, depth), approximate shipping weights, and system short circuit ratings.

Microprocessor Controller

The 7000 SERIES Microprocessor Based Controller is utilized across all ASCO Power Transfer Switches from 30 to 4000 Amperes, representing advanced digital control. It includes standard voltage, frequency, control, timing, and diagnostic functions essential for emergency and standby power applications. To mitigate severe voltage transients in industrial systems, the logic board is separated and isolated from the power board, enhancing noise immunity and transient suppression compliance.

Figure 14: Shows the 7000 SERIES Microprocessor Controller unit.

Figure 15: Displays the internal Microprocessor Power and Logic PC Boards.

The controller adheres to rigorous emission and immunity standards, including EN 55011, EN 50082-2, EN 61000-4-2, ENV 50140, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6, and EN 61000-4-11.

Features:

• Digital microprocessor with touch pad programming.
• Sixteen (16) selectable operating voltages.
• On-board diagnostics for system performance analysis.
• Displays and counts down active timing functions.
• Selectable multi-language display (English, German, Portuguese, Spanish, French).
• Password protection for settings.
• Remote monitoring and control via ASCO POWERQUEST® products (specify accessory 72E).
• Load shed option (specify accessory 30B).
• Historical event log.
• Statistical ATS systems monitoring information.

Voltage and Frequency Sensing:

• 3-Phase under/over voltage and frequency settings for normal and emergency sources.
• True RMS Voltage Sensing (+/- 1% accuracy), Frequency Sensing (+/- 0.2% accuracy).
• Selectable single or three-phase voltage sensing (50 or 60Hz).
• Phase sequence sensing for phase-sensitive loads.
• Voltage unbalance detection.

Status and Control Features:

• Output contact (N/O or N/C) for engine-start signals.
• Selection between "commit/no-commit" transfer modes.
• Advanced inphase algorithm for minimized disturbances during motor load transfers.
• Event log records 99 events with date, time, type, and reason.
• Output signals for remote indication of source acceptability.
• Statistical ATS/System monitoring data includes total transfers, source failure transfers, days energized, and hours sources were available.

Time Delays:

• Engine start time delay (0-6 seconds).
• Transfer to emergency time delay (0-60 minutes).
• Emergency source stabilization time delay (0-6 seconds).
• Retransfer to normal time delay (Power failure mode: 0-60 minutes; Test mode: 0-10 hours).
• Unloaded running time delay for engine cool down (0-60 minutes).
• Pre/post transfer signal time delay for selective load disconnect (0-5 minutes).
• Fully programmable engine exerciser with seven independent routines.
• Includes alarm signals, logic, and time delays for closed transition switches.
• In-sync time delay (0-3 seconds).
• Failure to synchronize (1-5 minutes).
• Extended parallel (0.1-1.0 seconds).
• Delayed transition load disconnect time delay (0-5 minutes).

User Controls and Indicators

Control Switches and Indicating Lights for Conventional 2-Position Switches:

• Switch position indicating lights (16mm LEDs).
• Source acceptability indicating lights (16mm LEDs) showing voltage, frequency, unbalance, and phase sequence status.
• Three-position selector switch: Automatic (maintained), Test (momentary), Reset Delay Bypass (momentary).

Figure 16: Illustrates the 7000 SERIES User Controls and Indicators for conventional switches.

Control Switches and Indicating Lights for Closed Transition Switches:

• Features include Extended Parallel Time indication, Failure To Synchronize alarm, TS Locked Out status, Alarm Reset, and a Closed Transition Bypass pushbutton.

Figure 17: Shows the 7000 SERIES User Controls and Indicators for closed transition switches.

7000 SERIES Power Control Center

The Power Control Center, featuring a backlit LCD, provides access to system status, power source parameters, settings, historical logs, and diagnostics. Users navigate via six buttons to access parameter settings, time delays, feature settings, engine exercise routines, and language selection. The unit is qualified for industrial and outdoor applications (Type 3R, 4, 12 enclosures).

Figure 18: Displays the 7000 SERIES Power Control Center.

Power Control Center Screens

The controller displays various screens for monitoring and configuration:

Status:

• System Status: Clear language indicating normal source acceptability and load connection.
• Source Status: Displays voltage, frequency, phase rotation, and voltage unbalance for normal and emergency sources.
• Time Delay Status: Shows active time delay status and remaining time.
• Inphase Transfer Mode: Indicates waiting for in-sync condition, showing relative phase angle and frequency differential.

Settings:

• Voltage and Frequency Settings: Displays voltage pick-up, dropout, and trip settings as percentages and RMS values for both sources.
• Engine Exerciser: Configures seven independent programs for engine exercise routines (load/no load, flexible run times, daily/weekly/bi-weekly/monthly).
• Time Delay Settings: Provides direct reading of configured time delays for transfer, bypass, and engine functions.
• Feature Settings: Allows activation of standard features like "shed load" option.

Data Logging:

• ATS Statistics: Provides instant statistical information on total ATS transfers, source failure transfers, and days energized.
• Historical Event Log: Displays detailed information for the last 99 events, including time, duration, date, and reason.

Optional Accessories

ASCO offers a range of optional accessories to enhance the functionality of the 7000 Series:

• Time Delays: Extended time delays for engine starting (Accessory 2C, 1G, 1GB).
• Manual Controls: Reset switches and selector switches for manual transfer (Accessory 6C, 6D).
• Indicators: Additional auxiliary contact sets and "Push-to-Test" feature (Accessory 14A/14B, 18B, 18G, 99).
• Extension Harness: For increased distance between transfer switch and control panel (Accessory 37B).
• Communications: 5150 Ethernet Connectivity Module (72E) and Industrial Ethernet Switch (72SW).
• Surge Protection: ASCO Pulsar 450 (73AC1, 73AC2, 73AC3).
• Special Applications: Custom nameplates, Generator-to-Generator applications, Seismic Certification, Buy American Provision compliance (Accessory 45, 111A, 111B, 125, 131).
• Customer Control Circuits: Load-shedding circuits and selective load disconnect contacts (Accessory 30A, 30B, 31Z). Terminal block for control connections (43R).
• Neutral Conductor Options: Solid, conventional switching, or overlapping neutral poles.
• Bypass-Isolation Switch Options: Auxiliary contacts for various switch positions, LED bypass status indicators, and automatic shutters (Accessory 14A1, 14B1, 14T, 14U, 14V, 82C, 82E).
• ASCO 5200 Series Metering: Power Meters (5210) and Power Managers (5220) for real-time measurement of voltage, current, power, energy, and frequency. They offer configurable designations and integrated ATS features.

PowerQuest Monitoring & Control Systems

The ASCO PowerQuest® family provides a comprehensive solution for communication, monitoring, and control of critical power systems. It empowers users to test, manage loads, optimize bus bars, and remotely monitor utility and on-site power status.

PowerQuest® Components:

• Connectivity Modules: ASCO 5150 (Ethernet) and 5160 (RCU) provide network connectivity and security.
• Power Meters: ASCO 5210 and 5220 measure and display power and energy information.
• Annunciators: ASCO 5310 and 5350 provide distributed monitoring of transfer switch position and source availability.
• Power Quality Meters: ASCO 5400 Series offer intelligent power analysis and event recording.
• Enterprise Critical Power Management System: The 5700 Series provides advanced monitoring, control, and management capabilities, integrating with servers and touch screen interfaces.

Selecting Your System:

PowerQuest® systems can be tailored to your needs, from basic monitoring (Standard Capabilities) for residential and light commercial applications, to configurable flexibility (Essential, Professional, Enterprise levels) for commercial and industrial facilities, up to ultimate customization for regional and global networks requiring sophisticated system-wide monitoring and control.

Product Functionality:

ASCO products and components are identified for specific functionalities. For example, ASCO Series 185 and 300 Automatic Transfer Switches use Connectivity Modules and Annunciators for local monitoring and remote testing. ASCO 4000 and 7000 Series ATS/Bypass-Isolation switches, with Power Control System Management, monitor voltage, phase currents, and integrate with BMS. The 7000 Series Automatic Transfer Switches, including Bypass-Isolation and Generator Paralleling Control Switchgear, offer advanced interaction with utility boards, paralleling gear, UPSs, and BMS, enabling comprehensive data capture and analysis.

PowerQuest® 5700 Critical Power Management System Architecture:

A detailed system diagram illustrates the interconnectedness of various components within the 5700 CPMS, including Utility, Generators, ATS units (7000 ATS, 300 ATS), Power Manager Units (5221), RCUs (5160), Operator Touch Panels (5702), Annunciators (5350), and CPMS Servers (5710, 5750, 5790). Communication paths include Ethernet and Fiber Optic connections.

Dimensions and Weights

Detailed tables provide physical dimensions (width, height, depth in inches and mm) and shipping weights (in pounds and kg) for various ASCO 7000 Series configurations, including:

• 2-Position Transfer Switching (7ATS, 7NTS) - Enclosed UL Type 12 and Open Configuration.
• Closed Transition and Delayed Transition Transfer Switching (7ADTS, 7ACTS, 7NDTS, 7NCTS) - Enclosed UL Type 12 and Open Configuration.
• Automatic Transfer Bypass-Isolation Switching (7ATB, 7NTB) - Enclosed UL Type 1 and Open Configuration.
• Automatic Transfer Bypass-Isolation in Closed Transition and Delayed Transition Switching (7ADTB, 7ACTB, 7NDTB, 7NCTB) - Enclosed UL Type 1 and Open Configuration.

Dimensional drawings are also provided for 800 Amp and 1000-1200 Amp Optional Front Connected Designs, illustrating front, and right-side views with key components labeled.