Series 70 eRPPs - ENMAXenmax-ups.com/.../PDF/LayerZero-Series-70-eRPPs.pdf · The LayerZero Series...

Series 70 eRPPsSelective Trip Coordinated

Remote Power Panel

Technical Specifications

2

© 2011 LayerZero Power Systems, Inc. Series 70 eRPP Technical Specifications

Series 70 eRPP

Basic Purpose

The LayerZero Series 70 eRPP provides a convenient means to

distribute power in a selective trip coordinated; and safe manner.

Inspired by NFPA-70E, the Series 70 eRPP™ remote power panel

is ideally suited for today’s high density always-on data-processing

environments.

The Series 70 eRPP increases reliability in two ways:

• Utilizes Finger-Safe Panel Board

• Provides Selective Trip Coordination Up to 25kAIC

With its SafePanel™ advanced design, there are no live parts

exposed when the deadfront is open and you can add a branch

breaker safely. Selective tripping eliminates the catastrophic

problems associated with the tripping of the panel board

main breaker in the event of a fault in the distribution system

downstream of a panel board branch breaker.

The panel board of the eRPP is designed for maximum operator

safety with its fully enclosed molded plastic bus and non-

conducting screws. Perfect for a raised-floor application, all feeder

and branch connections can be installed & thermal scanned fully

front and top of the Series 70 eRPP.

3


Agency Certification

The Series 70 eRPP is ETL listed to UL 60950

Main Circuit Breakers

Panel Boards

Reliability

• Insulated flexible bus • Compression connections at input feeder• Silver plated terminals• Machined cap screws & disc springs• Screw thread inserts to retain torque • Fanless operation

Safety

• IP-20, finger-safe panel board design • Dead-front hinged doors• Clear Translucent Polycarbonate

window to show breaker position • NFPA 70E friendly• InSight Ports to thermal scan input

feeder connections

Connectivity

• Ethernet• Bluetooth • Modbus/TCP• NTP time clock synchronization

Information Centricity

• “Black box” forensic diagnostics

• Branch Circuit Monitor (BCM)

• Branch current (2%) accuracy

• WFC

• Branch level alarm thresholds

• L-L or L-N configurable

• Main Circuit Monitor (MCM)

• Mains current & voltage (2%

accuracy)

• WFC

• Main circuit alarm thresholds

Door SwitchElectrical Configurations

• Voltage Ratings: 208/120V, 4-Wire,

400/230V, 4-Wire, 415/240V, 4-Wire,

480/277V, 4-Wire

• Current Rating: 225A (100% rated); or 400A

(100% rated)

• Two panel board (84 circuit) version with

one or two main feeds

• Four panel board (168 circuit) version with

one, two or four main feeds

• Panel Board Main Circuit Breaker is plug-in

• Each Panel Board may be fed by two

separate sources and may have two 4-pole

main circuit breakers

• Main Circuit Breaker is 100% continuous

duty rated

• Branch CB fault rating: 25kAIC at 208/120V,

14 kAIC up to 480/277V

• Panel board main CB fault rating: 25kAIC

standard

Series 70 eRPP

4


Series 70 eRPP

The Difference Is In The Details

The Series 70 eRPP provides power distribution with a focus on safety, reliability, connectivity, and information centricity. The

eRPP is on the forefront of design ingenuity, designed to meet the needs of professionals with the highest standards, providing

safe, selective-trip coordinated power that is flexible, scalable, and extremely reliable. The Series 70 eRPP empowers data center

specialists with a wealth of remotely-accessible power information, compatible with standard system management software.

The SafePanel™ Opening Will Not Allow Ingress Of 1/2” (12.5mm) Diameter Probe.

Incoming Feeder Terminals Are Ready For Long Barrel, Two Hole Compression-Style

Lugs For High Reliability Installations

Selective-Trip Coordination Protects Upstream Devices

LayerZero Cable Management Solutions Help Keep Wireways Organized

A Range Of Connectivity Options - Including Bluetooth, Make Information Accessible

CTs Located Throughout The eRPP Continuously Monitor The Power

LayerZero eRPPs Are Convection Cooled For Higher Reliability

5


LayerZero Designs For Long-Term Performance

The Series 70 eRPP is constructed to be strong and exceptionally reliable, both electrically

and mechanically.

Designed for safe and easy maintenance, the shape of the SafePanel™ on the eRPP

significantly reduces the probability of operator error, helping to ensure maximum uptime.

Operators are less prone to make mistakes when working with a finger-safe panel. Design

details such as breaker bolts that are not live and insulated buswork also help increase

reliability by putting less stress on operators.

Each branch breaker undergoes one controlled thermal trip and two controlled

instantaneous trips to ensure that the branch breaker performance is within design

tolerance.

Maximize Reliability With Selective Trip Coordination

The trend toward higher power density designs in modern data centers has created new difficulties in establishing proper circuit

breaker coordination. Higher capacity power distribution transformers with lower per-unit impedance has elevated fault current

levels and placed increasing coordination pressure on all downstream protective devices.

Main circuit breakers in series with traditional zero crossing branch circuit breakers may not permit proper selective trip coordination

at elevated fault current levels.

Selective trip operation via proper coordination is achievable at very high prospective fault current levels by using current limiting

(fast acting) branch circuit breakers.

Current limiting branch circuit breakers substantially ease the coordination design process, improve overall system reliability and

yield measurable uptime improvement for the mission critical facility end user.

Panel board critical bus outage lasts <4 msec. Critical loadscontinue to operate

Faulted branch CB trips in <4 msec

Downstreamfault

Main CB does not trip

High Speed Branch Circuit Breakers With Selective Tripping

Reliability

Critical Boards Are Serialized For Traceability And To Help Manage

Firmware Upgrades

Selective-Trip Coordinated Branch Circuit Breakers Can Be Safely Added In Minutes

6


Branch Breakers Need To Be High Speed Because:

Push Close

Contact Closes

Current Flow (Load) Current Flow (Source)

True mission critical performance is achieved when RPP

components are designed to trip selectively; AND have the property of current-limiting or

high-speed tripping.

Fast Acting Circuit Breakers

The circuit breakers in the Series 70: eRPP are plug-in, high-speed, current limiting, 25kAIC; designed for selective tripping. A bolted

fault on the output of one branch circuit breaker is interrupted in less than 4 milliseconds. This fast tripping action, combined with

the fact that the main circuit breaker does not trip means that the rest of the loads fed by the panel board survive the fault.

The voltage interruption on the main bus is less than a quarter cycle.

The panel board designed with fault withstand rating of 25kA for robust performance in a dynamic environment.

- This means that the panel board main bus experiences an outage that loads cannot tolerate

before the fault is cleared.

- In this situation, even if selective tripping is ensured by the proper selection of the much slower

main breaker, all of the panel board loads may be lost by virtue of a longer outage on its main bus.

• Computer loads cannot

withstand an outage greater

than 20 milliseconds (roughly

1.25 electrical cycles), per ITIC.

• When a fault occurs downstream of

a branch breaker, it impinges zero-

voltage on the main bus of the panel

board until the breaker is able to trip

open and clear the fault.

• A conventional “zero-crossing”

type branch breaker can take

several cycles to trip open when

subjected to a downstream fault.

Reliability

The eRPP Protects Upstream Devices

7


Reliability

Screw Thread Inserts

LayerZero utilizes Heli-Coil inserts on bolted joints for prevailing torques and long-term reliability. Such connections are designed to retain a constant torque throughout the life of the product.

Convection Cooling

For maximum availability, the Series 70 eRPP utilizes convection cooling. The convection cooled eRPP design allows for heat to be safely dissipated without the need for fans, for higher reliability.

Machined Cap Screws & Disc Springs

Our systems utilize machined cap screws and engineered disc springs with a flat pressure vs deflection profile to ensure that all bolted connections maintain constant torque through the life of the product.

Pres

sure

DeflectionSpring deflection due to the heating and cooling of the joint results in….

… significant changes joint pressure. Over time the joint loosens.

Springs that are based on Conical sections – used in LayerZeroproducts

Washers/Springs that are based on Parabolic sections

2%-3% failure rate for Washers/Springs that are based on Parabolic sections

Pres

sure

Deflection

Qualitative Review of Disc Springs

Spring deflection due to the heating and cooling of the joint results in….

… insignificant changes joint pressure. Over time the joint integrity is maintained.

Springs that are based on Conical sections – used in LayerZeroproducts

8


`

Thermal/Overload Protection

- Slow over-heating situation- Protection of cables & wires against excessive heating - Thermal trip element (bi-metal) activates

Magnetic/Overload Protection

- Downstream phase-phase; or phase-ground fault- High rate of rise of current- Electromotive force creates a “hammer” effect- Magnetic element mechanically decoupled from thermal element

Tripping of an MCB: 1/2 ms after short-circuit current is released

Tripping of an MCB: 1 ms after short-circuit current is released

Tripping of an MCB: 1.5 ms after short-circuit current is released


Tripping of an MCB: 2.5 ms after short-circuit current is released


High Speed Tripping and Arc Extinguisher Action Demonstration

High Speed (Current Limiting) Circuit Breaker Operation

Arc Runner & Arc Chute

- Open the mechanical contact AND -Extinguish the arc - IN LESS THAN 4 milliseconds

Reliability

9


Designed for operator safetyAn arc can form as two live conductors are separated – such as the removal of a circuit breaker from a panel board.

The SafePanel design ensures that a potential arc would be contained in the connection well even if a branch breaker were to be removed.

The connection well is over 1” deep

Designed For Raised Floor Application

The unit is raised to provide for space for cabling at the bottom of the unit, and the holes punch downward to allow for easy cable installation.

Polycarbonate Window

The status of breakers can be safely viewed through the window.

Safety in the data center is a serious concern, as the hazards associated with arc flash and electrical shock kill, blind, and burn thousands of workers annually. Most of the damage caused by workplace accidents can be prevented.

We believe it is the responsibility of manufacturers to proactively design equipment that does not require exposure to energized parts during normal operations.

Our Series 70 product line was inspired by NFPA-70E to help critical facilities drastically reduce the risks of exposure to electrical energy.

A Proactive Stance Towards Operator Safety

1”

Safety

10


Open protocols

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

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

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

Series 70 eRPP

- Summary Alarm- Panel Setup

Dry ContactsStandard Ethernet

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

- Meters- Alarms - Waveforms- Setup - History/Event Log- Diagnostics

- Meters- Alarms

- Meters- Alarms

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 Series 70 eRPP 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

Connectivity

11


LCD Information

The front mounted LCD panel provides operators with a great deal of information, including:

• Alarms

• Main 1 Basic Meters

• Main 2 Basic Meters

• Branch Amps Meters

• Branch kW Meters

• Main 1 Derived Meters

• Main 2 Derived Meters

• Branch Derived Meters

Panel Board Power Monitor Basic FunctionsBranch circuit power monitorMain circuit power monitorLocal display of main and branch circuit parameters

Branch Circuit Power MonitorFor each pole of the 42-pole panel board, measures: Voltage; Current (A); Frequency (Hz); Power (kW); Apparent Power (kVA); Power Factor; and Power Consumption (kW-H)Wave form capture of over-current/fault event at any branch breaker

LayerZero systems easily connect to a standard web browser over a VPN so that the information can be securely accessed remotely.

The eRPP generates a wide variety of power usage information, which can help managers better identify potential problems, assess the power usage to drive business decisions, and develop a basis for determining what can be done to improve the process.

Without measurable information, a greening or reliability strategy is difficult to follow through. The Series 70 eRPP provides the right information in a timely manner to help operators and managers make sound, well thought-out decisions.

Make Better Decisions With eRPPs.

This document is subject to change without notice. Rev: 9/27/10

Information Centricity

Information Can Be Accessed Remotely Or From The LCD Panel

12


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