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Series 70: eSTS 150 A - 1200 A Static Transfer Switch

Product Brochure

eSTS Static Transfer Switch Purpose

eSTS Transfers Between Multiple Power Sources

The Series 70 eSTS is a solid-state transfer switch that automatically or manually provides static transfers

between two three-phase AC sources in less than a quarter cycle. The eSTS performs open-transition

transfer in such a manner that the connected load disruption is minimized without ever cross-

connecting the power sources. One power source is selected to be the preferred source. If the

preferred source fails the load is automatically and seamlessly connected to the alternate source by

means of an open-transition static transfer.

The LayerZero eSTS Static Transfer Switch Maximizes Power Reliability

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Series 70: eSTS Brochure © 2014 LayerZero Power Systems, Inc.

The Series 70 eSTS is ETL listed to UL 1008

Certified To CSA Std C22.2 No. 107.1

Section Contains: Input isolation switches

Bypass isolation Switches

Output isolation switches

Source connection terminals

Load connection terminals

Section Contains: Power electronics

• SCRs (Silicon Control Rectifier)

• Snubber Circuits

Heat-sinks

Control Electronics

• System Control & Data Boards

• SCR Gate Drives

• Redundant Power Supply System

• I/O system; VPN Router

eSTS Product Overview

Product Features

Safe Bypass Procedure

Voice Guided Bypass

Optional Triple Modular Redundancy

Epoxy Coated Buswork

Silver Plated Terminals

Maintenance-Free Joints

Machined Hardware

Screw Thread Inserts

Convection Cooling

Optical Fiber Based Controls

Serialized Critical Board Tracking

Reliability Safety

Connectivity

Waveform Capture

“Black Box” Forensic Diagnostics

Touch Screen Interface

Waveforms Automatically Emailed

Power Quality Monitoring

Agency Certification

InSight™ IR Portholes

Sectionalized Components

Polycarbonate Windows

Front-Only Access

Dead-Front Hinged Doors

Ethernet Connectivity

Modbus/TCP

NTP Time Clock Synchronization

SNMP Connectivity

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LayerZero Provides A Complete Critical Power Solution

Source 1 (UPS A)

Source 2(UPS B)

Series 70: eSTSStatic Transfer Switch

Series 70 ePODs: Type-PSTS + PDU + Transformer

Series 70 eRDP: PDU + Subfeeds

Series 70: ePanel-2Remote Power Panel

Series 70 ePODs: Type-XPDU + Transformer

Series 70 eRPP Remote Power Panel

Series 70 ePanel-1 Remote Power Panel

Series 70 ePanel-HD High-Density RPP

Critical LoadCritical LoadCritical Load

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800 A eSTS

Control ElectronicsControl Electronics

Polycarbonate Window/InSight™ IR Portholes

Convection Cooled Exhaust

Silver Plated TerminalsCircuit Breakers

eSTS Mechanical Overview

InSight™ IR PortholesOptional Triple Modular Redundancy 15” Color Touch Screen GUI

Hinged Dead-Front Doors

Convection Cooled Heat Sinks

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Mechanically Interlocked for Sequenced Operation

In order to minimize the possibility of operator error during equipment bypass operations, LayerZero

provides:

1) Interlocked breakers

2) Mechanisms to ensure that a source cannot be bypassed without the STS on the correct source.

3) Safeguards to make certain that sources cannot be connected to each other inadvertently.

4) A voice-prompted bypass procedure that guides the operator through the sequence.

5) A step-wise pictorial & video presentation is provided on the touch-screen display during bypass.

Safe Bypass Procedure

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Voice Guided Bypass

Designed To Eliminate Human Error

The number one cause of static switch load-loss is operator error during maintenance bypass. To help prevent

operators from completing the bypass procedure out-of-sequence, our products feature a voice prompted

bypass procedure. This instructs the operator in a step-by-step course of action of the process, with only

one operation per screen. Voice guided bypass slows down operators and compels them to think about the

process, significantly reducing the probability of operator error.

Visual and audio cues provide clear instructions on the bypassing sequence.

Voice Guided Bypass Procedure Screenshot Interlock Bar Rotating Downward

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Triple Modular Redundancy Option

The Series 70: eSTS occupies a unique architectural location in mission critical infrastructure systems.

The units are available in SMR (Single Modular Redundancy) or TMR (Triple Modular Redundancy) configurations, both of which are architectures that eliminate single points of failure.

The TMR configuration will continue its mission of being a static transfer switch even if any one control element were to fail. As such, it is known to improve reliability by an order of magnitude.

Triple Modular Redundant products serve the needs of elite, mission-critical infrastructure requirements. With our Triple Modular Redundant STS topology we can provide products that are at least ten times more reliable than alternative solutions.

The Ultimate In Power Reliability

Three Logic Paths instead of One

• Three Data Acquisition Boards

• Three System Control Boards

• Three drives per phase (i.e. per SCR pair)

• 1-2 orders of magnitude more reliable than a single path.

TMR Control Boards

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Epoxy Coated Buswork

Helps Ensure System Reliability

Our usage of epoxy coated buswork helps ensure

safety, protecting operators from being exposed to live

parts, and making the system inherently more reliable

by eliminating the possibility of bus-to-bus faults.

Epoxy coating provides excellent insulation when safety

is mandatory.

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Epoxy Coated Buswork Near CBs

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Silver Plating

Provides Excellent Electrical Conductivity

LayerZero utilizes silver plating on all bus joints

and terminals to be able to provide the highest

performance. Silver has high conductivity and low

resistance - which makes for a great contact.

Silver Plated Buswork in 1200 A eSTS

Silver Plated Output Terminals

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Maintenance-Free Joints

High Mechanical Reliability

Electrical copper bus joints that cannot be accessed by

the operator for thermal scanning and maintenance are

brazed. This creates a maintenance-free joint. LayerZero

systems are durable, sturdy, and built to last.

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Brazed Invisible Joints

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Convection Cooling

No Fans, Dust Filters, or Fan Fuses

Fans and fan sensors are one of the most common

components to fail. For maximum uptime, eSTS systems

do not contain any fans, dust filters to change, or fan

fuses to replace. The Series 70: eSTS Static Transfer

Switch utilizes a natural convection-cooled heat

dissipation system.

The heat sink arrangement is staggered between

sources and phases to minimize the creation of extreme

thermal gradients between heat sink columns when

conducting on one source or the other.

Heat Sink in 1200 A eSTS

Heat Sinks Near SCR in 400 A ests

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Optical Fiber Based Controls

Fiber Optic Controls Increase System Reliability

Fiber optic based controls eliminate noise and

interference, while isolating components from high

voltage.

Optical fiber allows service to be reliably connected,

while protecting the equipment.

Gate Drive with Optical Fiber Controls

SCB with Optical Fiber Controls

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Serialized circuit boards

We serialize and track all critical circuit boards and memory cards through our eBOSS portal, which allows customers to reference which components their machines are made from, who tested the components, as well as the ability to view notes generated from testing. Serialized components offer the ability to drill-down on prospective component failure utilizing predictive modeling techniques, so if part fails, the instance can be cross-referenced with similar parts. This preventative maintenance helps ensure maximum uptime.

Serialized Critical Board Tracking

Serialized Gate Drive Boards

Serialized System Control Board

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InSight™ IR Portholes

Scan Bolted Connections with Dead-Front Doors Closed

Strategically positioned IR-scan portholes to enable safe thermal

scanning of all bolted connections with the deadfront closed, without

exposing the operator to power circuit voltage.

The IR window swivels upward and unlocks with key-hole access

to reveal a mesh, allowing the operator to point-and-shoot

thermal cameras to obtain accurate readings. LayerZero provides

documentation for proper thermal scanning procedures.

CB101 CB102

CB201 CB202

CB302

Source 1 Source 2

CB301

Load

1

2

1

2 2

IR Portholes in eSTS (Door and side panel hidden for visibility)

IR Porthole Being Scanned

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Sectionalized Components

Sectionalized Components Help Maximize Operator Safety

Operators are well-protected from exposed connections. Normal operator sections (breakers/switches) are

physically separated from the power electronics and control electronics sections, so that maintenance on a

section can be safely performed. If maintenance is required on a particular section, power can be bypassed to

another section to allow for safe repairs to be made. All connections are optically isolated to minimize risk.

Energized parts are all insulated, covered, recessed, &/or internally mounted for safer operation of the unit. In

addition, sections that isolate machine components are insulated.

Control Section Isolated from Circuit Breakers

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Polycarbonate Windows

View Status LEDs With Dead-Front Doors Closed

Our Series 70 product line was inspired by NFPA-70E, to

help data centers drastically reduce the risks of their energy

distribution systems.

Operators can view the status of diagnostic LEDs without

exposure to the energized power electronics section.

LEDs on Critical Board

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Front-Only Access

Front Only Access Enhances Critical Load Reliability

The Series 70: A eSTS can be installed, operated, diagnosed and maintained from the front. The dead-front

panels are hinged, and side or rear covers never have to be removed. Thermal scans of every single bolted

joint in the product can be done from the front of the system – without ever having to open the dead-front

door.

Unhinged covers can be bulky and unwieldy, and operator error during removal and replacement of covers has

been known to cause mishaps and compromise load reliability.

A safe, non-invasive operation and maintenance regime results in a higher reliability of the critical load.

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Dead-Front Hinged Doors

Dead-Front Hinged Doors Maximize Operator Safety

The Series 70: eSTS utilizes dead-front hinged doors. Outer doors are protected by an alarm that notifies when

a door has been opened.

Dead-Front hinged doors provides the benefits of:

• Operation of circuit breakers with dead front doors closed

• Measuring of bolted connections using InSight™ IR Portholes with dead front doors closed

• Viewing of status LEDs with dead front doors closed

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Ethernet Connectivity

Open protocols

LayerZero utilizes open source protocols for its communications, which allows for:

• An enhanced ability to customize software• Flexible software development options • Lower total cost of ownership (no per copy fees)• Elimination of vendor lock-in• No proprietary limitations • Provides a stable, well developed foundation

The control path for the communications system gathers information from all aspects of the machine, isolated by fiber optics.

Connectivity to a WAN allows for the information to be accessible from any location, offering a variety of monitoring options.

Modbus/TCP http:// through a standard web browser

Network Time Protocol (NTP) Compliant

Simple Network Management Protocol

(SNMP)

Waveforms Automatically Emailed

Series 70: eSTS

Standard Ethernet Dry Contacts

• Meters• Alarms

• Meters• Alarms• Waveforms• History/Event Log• Diagnostics

• Summary Alarm• On Source 1• On Source 2• Source 1 Available• Source 2 Available

A variety of connectivity options provide operators with the ability to adapt LayerZero systems to fit existing networks without the complications of working with closed, proprietary systems.

The eSTS is designed to make it easy to transfer and exchange power usage data, which is very useful towards making smart corporate decisions and policies.

A Flexible Approach

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Waveform Capture

Real-Time Waveform Capture

Each transfer event and overload transfer-inhibit

event is captured and stored in non-volatile memory.

It provides 3-phase current and 3-phase voltage

waveform analysis of Source 1, Source 2, (Source 3 in

a 3-source system) and Output 3 cycles before and 3

cycles after the transfer event.

Precise voltage and current data is necessary to

understand why a transfer was made. Detailed records

of transfers help operators better understand the root

cause of events, helping engineers properly eradicate

problems. Without waveform capture, this is not

possible in a live environment.

LayerZero Waveform Capture Can Help You:

• Fingerprint Incidents

• Find The Root Cause Of Events

• Monitor Power Quality In Real-Time

• Waveform Capture On All Devices

The 6-cycle capture is displayed on the control panel or can

be viewed remotely on a standard web-browser.

Waveform Capture on Local Display

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“Black Box” Forensic Diagnostics

“Black box” forensic diagnostics

The black box capabilities of LayerZero equipment are

extremely useful for analyzing root cause analysis,

enabling operators to pinpoint exactly where a fault

occurred. “Black box” forensics provide successive event

information with ten microsecond resolution, supplies

a brief snapshot of the event with a lead-in for further

inquiry, and furnishes a real-time status indicator of all

machine parameters at the time of the event.

LayerZero Black Box Forensics Can Help You:

• Reconstruct The Sequence of Events

• Find the Root Cause of Power Quality Incidents

• Record Snapshots of the Power

“Black box” event history is one of the most useful recording

schemes in the mission critical power machine industry.

System Control Board

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Touch Screen Interface

Touch screen interface

The Dynamic Mimic Panel is presented on a 15” color touch screen Graphical User Interface, which was carefully designed to be user-friendly, intuitive, and consistent.

The GUI is “Read-Only” unless a user has logged on. A walk-up user may examine the state of the switch, but can not change that state. Operators have instant access to real-time power usage information, including real-time waveform capture.

A mimic panel graphically shows the current state of the switch and power flow, while health meters provide operators with the capability to know the status of a TMR instantly.

The presence of an alarm is visible on every screen. Active alarms can be silenced. In a TMR system, when an alarm is posted by only one SCB the system continues to operate as a fully functional STS. Such an alarm points to a problem in only one of the three independent control systems.

Each transfer event and overload transfer-inhibit event is captured and stored as part of the history of the machine.

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Series 70: eSTS Technical Characteristics

eSTS Models with Withstand Ratings

120/208 V480 V; 480/277 V; 415/240 V;

400/230 V; 220/380 V600 V; 600/347 V; 575 V

150 A

150kA; 100kA; 65kA 150kA; 100kA; 65kA; 35kA 100kA; 65kA; 35kA; 25kA250 A

400 A

600 A

800 A100kA; 65kA

100kA; 65kA; 50kA; 35kA 42kA; 35kA; 25kA

1200 A 100kA*; 65kA; 50kA 65kA*; 50kA; 25kA

* Upgrade to Automatic Circuit Breakers

Mechanical Characteristics * 150 A - 250 A 400 A 600 A 800 A 1200 A

Heat Dissipation 4,750 BTU/Hr 7,000 BTU/Hr 9,500 BTU/Hr 12,500 BTU/Hr 24,000 BTU/Hr

Weight 1,350 lbs 1,400 lbs 1,500 lbs 1,950 lbs 5,500 lbs

Dimensions 48”W x 36”D x 80”H 58”W x 36”D x 80”H 96”W x 48”D x 90”H

Frame Construction Welded Frame

Enclosure Gauge 16 Gauge or greater

Electrical Connections Silver-Plated Solid Busbar

Color Textured Powder Coat White (RAL 7035), Black, Custom

Floor Stands Optional

Seismic floor stands Optional

Junction Boxes Optional

Sectionalization Engineered Composite Insulation, Dead Front Doors

Electrical CharacteristicsNumber of Inputs 2, 3

Number of Output CBs 1, 2

Frequency 50 Hz, 60 Hz

Poles 3-pole, 4-pole

Phases 3 Phase, 3 Wire, 4 Wire + Ground

Neutral Rating 100%, 150%, 200%

Transfer Time Nominal 1/4- cycle

Redundancy Single Modular Redundancy, Triple Modular Redundancy Optional

Circuit Breaker Type Molded Case Switch (Standard), Electronic Trip (Optional), Thermal Magnetic Trip (Optional)

Circuit Breaker Mounting Type Plug-In

TVSS Standard

Power Quality Monitoring Waveform Capture Local Display, Remote Display via Web Browser, Waveforms Automatically Emailed

Voltmeter Input sources and Output, for each phase

Ammeter Input sources and Output, for each phase

Frequency Meter Both Sources

Synchroscope Phase Angle Meter Between Sources

Metering Apparent Power, Real Power, Power Factor, Output Total Harmonic Distortion

Time Stamped Transfer Count From First Day Use, From Last Reset

CB Status Indicator Open/Closed/Tripped Circuit Breaker

SCR Pair Indicator Conducting/Non-Conducting

Source Indicator Preferred Source

Current Path Indicator Energized Current Path

*Dimensional & weight data is only valid for 2-source.

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Operational CharacteristicsTransfer Modes Manual, Automatic

Inrush Mitigation Technology Patented Dynamic Phase Compensation Algorithm

Password Protection User Configurable Roles

Cooling Convection Cooling

Cable Access Top/Bottom

Service Access Front Only

Bypass Interlock Mechanism Mechanical

Noise & Interference Isolation Optical Fiber

IR Scan Port Type InSight™ IR Portholes

SCR Type Puck

Display Type 15” Color Touch Screen

Display Resolution 1024x768

Bypass Assistance Voice-Guided Bypass

Audio Bezel-Mounted Stereo Speakers

Languages English, French

Mimic Panel Digital

Setpoints Control Digital

Power Supplies Redundant

Backup Monitoring System LED (Light Emitting Diodes)

Connectivity Meters Local Display, Ethernet, Modbus/TCP, http via Web Browser (Non-Proprietary)

Alarms Local Display, Ethernet, Modbus/TCP, http via Web Browser (Non-Proprietary)

Summary Alarm Dry Contacts; Local Display; Modbus/TCP; Web Browser

Waveforms Local Display, Ethernet, http via Web Browser (Non-Proprietary)

History/Event Log Local Display, Ethernet, http via Web Browser (Non-Proprietary)

Diagnostics Local Display, Ethernet, http via Web Browser (Non-Proprietary)

Time Synchronization Network Time Protocol (NTP)

Standards ConformanceCSA C22.2 No 107.1

IEEE C62.41 and 45

NEMA AB-1

NFPA 70E

UL ETL Listed to UL 1008

Series 70: eSTS Technical Characteristics

All data tables above are for 3-pole only. Contact LayerZero for custom sizes and designs.

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LayerZero Power Systems, Inc. 1500 Danner Drive

Aurora, OH 44202 U.S.A.

© 2014 LayerZero Power Systems, Inc.

LayerZero Power Systems, LayerZero.com and the LayerZero logo are registered trademark of LayerZero. All product specifications are subject to change without notice.

Learn more at www.LayerZero.com

Rev. 6/14

http://www.LayerZero.com

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