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