Allen-Bradley 857 Quick start guide

857 Protection System for Feeder and Motor Protection,

Bulletin 857, Series A

Catalog Number 857-QS001B-EN-P

Quick Start

Original Instructions

Important User Information

Read this document and the documents listed in the additional resources section about installation, configuration, and

operation of this equipment before you install, configure, operate, or maintain this product. Users are required to

familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws,

and standards.

Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are

required to be carried out by suitably trained personnel in accordance with applicable code of practice.

If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may

be impaired.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from

the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and

requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or

liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or

software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation,

Inc., is prohibited

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

Labels may also be on or inside the equipment to provide specific precautions.

WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous

environment, which may lead to personal injury or death, property damage, or economic loss.

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property

damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.

IMPORTANT Identifies information that is critical for successful application and understanding of the product.

SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous

voltage may be present.

BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may

reach dangerous temperatures.

ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to

potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL

Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).

Rockwell Automation Publication 857-QS001B-EN-P - April 2017 3

Table of Contents

Preface

Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Supported Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Chapter 1

Overview SetPointPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

User Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Firmware Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Operating Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Protection Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Before Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Catalog Number Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chapter 2

Mounting and Wiring

Instructions

Mounting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Measuring and Control Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Voltage Measurement Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Chapter 3

Local Panel User Interface Protection System Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Menu Navigation and Pointers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Communication Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Digital and Virtual Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Virtual Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Output Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Chapter 4

Installation Step 1: Gather Required Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Step 2: Review Required Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Step 3: Validate the 857 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Configuring the Protection System. . . . . . . . . . . . . . . . . . . . . . . . . . 30

Step 4: Power Up, Configuring the Protection System and Verifying

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Step 5: Configuring the SetPointPS Software Tool . . . . . . . . . . . . . . 32

Step 6: Configuring the Protection System Using SetPointPS . . . . . 33

Set the Valid Protection Stages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Set the Current Scaling Parameter Using the Front Panel . . . . . 36

4 Rockwell Automation Publication 857-QS001B-EN-P - April 2017

Table of Contents

Notes:

Rockwell Automation Publication 857-QS001B-EN-P - April 2017 5

Preface

This publication guides you through the 6 basic steps that are required to start

up your Allen-Bradley® 857 Protection System for the first time for simple

applications. The comprehensive protection functions of the Protection

System make it ideal for utility, industrial, marine, and offshore power

distribution applications. Because the Protection System is designed for global

applications, it includes both ANSI IEEE and IEC protective function

numbers and symbology.

Who Should Use This Manual

This manual is intended for qualified personnel who understand the hazards

that are associated with electromechanical equipment installations.

Personnel must:

• Follow all applicable local, national, and/or international electrical

codes.

• Be able to program and operate motor/feeder protection devices of this

type and style.

• Have an understanding of the appropriate parameter settings and their

protective functions that are related to the load being controlled and

protected.

• Have access to the user manual 857- UM001

and be familiar with the

characteristics of the device.

Equipment

The following equipment requirements must be followed and applied to use

this quick start procedure.

• The 857 Protection System is in a standalone installation.

• No load sharing or multiple motors on one Protection System.

• Access to an approved programming cable – catalog number

857VX003-3.

• A computer with an available USB port and a USB to RS-232 serial port

converter. Such as the Allen-Bradley 9300-USBS USB to Serial Adapter.

• The latest available version of the SetPointPS programming and

commissioning software tool that is downloaded and installed on a

portable computer. The SetPointPS software is available at

www.rockwellautomation.com

Supported Applications

This publication is intended for use with 857 protection systems that are used

on typical applications. For example, induction machines, motors controlling

fans, pumps, compressors, conveyors, or feeder type loads such as transformer

and capacitor bank protection.

6 Rockwell Automation Publication 857-QS001B-EN-P - April 2017

Preface

Installation

The content of this manual assumes that the 857 Protection System is installed

according to Rockwell Automation® guidelines and includes the following.

• The Protection System installation meets mechanical requirements for

orientation, cooling and mounting hardware.

• The Protection System installation meets environmental requirements

for surrounding air temperature, ambient atmosphere, and the enclosure

rating.

• The Protection System installation meets electrical requirements for AC

or DC supply, wiring and grounding, and the appropriate application of

overload and short circuit protection. Based on the switching

technology for the load (breaker versus contactor).

• The Protection System installation is compliant with all applicable local,

national, and international codes, standards, and requirements.

Additional Resources

These documents contain additional information concerning related products

from Rockwell Automation.

You can view or download publications at

http://www.rockwellautomation.com/global/literature-library/overview.page

For paper copies of technical documentation, contact your local Allen-Bradley

distributor or Rockwell Automation sales representative.

IMPORTANT This guide does not replace the User Manual, publication 857-UM001

, and is

intended for qualified service personnel responsible for installing and

servicing these devices. You must have previous experience with and a basic

understanding of electrical terminology, configuration procedures, required

equipment, and safety precautions. See the SetPointPS Configuration

Software Programming Manual 857-PM001

for more information.

Resource Description

Industrial Automation Wiring and Grounding Guidelines,

publication 1770-4.1

Provides general guidelines for installing a Rockwell

Automation® industrial system.

Product Certifications website, http://

www.rockwellautomation.com/global/certification/

overview.page

Provides declarations of conformity, certificates, and

other certification details.

Rockwell Automation Publication 857-QS001B-EN-P - April 2017 7

Chapter 1

Overview

All necessary steps must be taken to assure that each application and use meets

all performance and safety requirements. All applicable laws, regulations,

codes, and standards must also be followed.

The illustrations, charts, sample programs, and layout examples that are shown

in this guide are intended solely for purposes of example. There are many

variables and requirements that are associated with any particular installation.

Rockwell Automation® does not assume responsibility or liability (to include

intellectual property liability) for actual use that is based on the examples that

are shown in this publication.

Important differences between solid-state equipment and electromechanical

devices are discussed in Rockwell Automation SGI-1.1, Safety Guidelines for

the Application, Installation and Maintenance of Solid-State Control. See your

local Allen-Bradley distributor for a copy. These differences must be

considered when products are applied such as the ones described in this

publication.

SetPointPS

SetPointPS is a relay configuration tool for Rockwell Automation 857

Protection Systems. All configurations are made with a user-friendly graphical

interface and the created documents can be printed and saved. SetPointPS can

read all information directly from the device. It can be obtained free of charge

at www.rockwellautomation.com

It is possible to read and evaluate disturbance recordings from Rockwell

Automation 857 and 865 Protection Systems. The built-in evaluator uses

standard COMTRADE files for saving the records. See publication 857-

PM001.

User Interface

The relay is controlled in three ways:

• Locally with the push button on the relay front panel, see Protection

System Front Panel on page 21).

• Locally by using a personal computer that is connected to the serial port

on the front panel or on the rear panel of the relay (both cannot be used

simultaneously).

• By remote control over at least one of the communication ports on the

relay rear panel.

8 Rockwell Automation Publication 857-QS001B-EN-P - April 2017

Chapter 1 Overview

Firmware Compliance

The Settings files between major revisions of firmware are not compatible with

other major versions. This statement is true of products with version 10.xxx

firmware, version 12.xxx firmware, or higher.

Operating Safety

Protection Functions

The comprehensive protection functions of the relay (Tab l e 1) make it ideal for

utility, industrial, marine, and offshore power distribution applications.

Because the 857 Protection System is designed for global applications, it

includes both ANSI IEEE and IEC protective function numbers and

symbology.

IMPORTANT Do not load Settings file between relays of different version numbers.

ATTENTION: The terminals on the rear panel of the relay can carry

dangerous voltages, even if the auxiliary voltage is switched off. Do not place

a live current transformer secondary-circuit in an open circuit condition. The

disconnection of a live circuit can cause dangerous voltages! Any operational

measures must be conducted according to national and local directives and

instructions.

IMPORTANT Read the operation instructions before performing any operational

measures.

Table 1 - List of Protection Functions

IEEE/ ANSI Code IEC Symbol Function Name Note

25 df/dv Synchrocheck

27 U<

U<<

U<<<

Undervoltage protection

32 P<

P<<

Reverse power protection

37 I< Undercurrent protection

46R I

> Current unbalance protection - Feeder protective

mode

Only available when

application mode is

feeder protection.

46 I

> Current unbalance protection - Motor protective

mode

Only available when

application mode is

motor protection.

47 I

>> Phase reversal / incorrect phase sequence protection Only available when

application mode is

motor protection.

Rockwell Automation Publication 857-QS001B-EN-P - April 2017 9

Overview Chapter 1

48 I

> Stall protection Only available when

application mode is

motor protection.

49 T> Thermal overload protection

50ARC ArcI> Optional arc fault-protection

50BF CBFP Circuit-breaker failure protection

50N/51N

50G/51G

50GS/51GS

>>>

>>>>

Earth-fault protection External connection

method and protective

settings define

protection type.

50NARC ArcI

ArcI

Optional earth-fault protection

50NC/51INC I

CAP Capacitor-bank unbalance protection

50/51 I>

I>>

I>>>

Overcurrent protection

59 U>

U>>

U>>>

Overvoltage protection

59N U

Residual voltage protection

66 N> Frequent start protection Only available when

application mode is

motor protection.

67 I

>>>

>>>>

Directional overcurrent protection

67N I

Directional earth-fault protection

67NI I

Oint

> Directional transient intermittent earth-fault

protection

68F2 U

> Magnetizing In Rush

68F5 U

> Transformer over excitation, 2nd harmonic

81 f><

f>><<

Frequency protection, 5th harmonic

81L f<

f<<

Underfrequency protection

81R df/dt Rate of change of frequency (ROCOF) protection

86 Lockout All protective elements

can be set for lockout

control.

99 Prg1…8 Programmable stages

Table 1 - List of Protection Functions (continued)

IEEE/ ANSI Code IEC Symbol Function Name Note

10 Rockwell Automation Publication 857-QS001B-EN-P - April 2017

Chapter 1 Overview

General Precautions

Before Installation

WARNING: Have only qualified personnel service this equipment. If you are

not qualified to service this equipment, you can injure yourself or others, or

cause equipment damage.

• Equipment components are sensitive to electrostatic discharge (ESD).

Undetectable permanent damage can result if you do not use proper ESD

procedures. Ground yourself, your work surface, and this equipment before

removing any cover from this equipment.

• Disconnect or de-energize all external connections before opening this

device. Contact with hazardous voltages and currents inside this device can

cause electrical shock that can result in injury or death.

• This document is to be utilized as a startup or a commissioning document

only. Full understanding of the relay protective functions is required before

any unit is placed in full protective mode.

See User Manual 857-UM001

for further details on the Bulletin 857

Protection Relay.

Rockwell Automation Publication 857-QS001B-EN-P - April 2017 11

Overview Chapter 1

Catalog Number Explanation

Nom Phase Current (A) / Nom DI7-28 Activation Voltage

31 A/5 A / 24V

6 1 A/5 A / 110V

7 1 A/5 A / 220V

Nom Earth-fault Current I/O1 and I/O2 [A]

C1 A and 5 A

D0.2 A and 1 A

Additional I/O (X8 Terminal)

6None

7 Eight standard inputs, four TCS Hybrid inputs/outputs

8Ten outputs

9 Eight standard inputs and four outputs

(1)

(1) Some options not UL Listed. Check with your Rockwell Automation® representative.

Supply Voltage [V]

A 40…265Vac/dc

B 18…36 Vdc

C 40…265Vac/dc + Arc Protection Option

D 18…36 Vdc + Arc Protection Option

E 40…265Vac/dc + DI19, DI20 + arc channel, Optional

F 18…36 Vdc + DI19, DI20 + arc channel, Optional

Optional Hardware (Communication port 1)

Code Description

A TTL/RS-232 (VCM TTL)

B Plastic/Plastic serial fiber interface (VCM FIBRE PP)

CN/A

D RS-485 interface (4-wire, VCM 485-4)

Glass/Glass dual serial fiber interface for 857-RAD (857-VCMFIBRE

GG)

(1)

(1) Required for connection to 857-RAD Enhanced RTD Scanner. Only available in this location.

F Rx Plastic/Tx Glass serial fiber interface (VCM FIBRE PG)

G Rx Glass/Tx Plastic serial fiber interface (VCM FIBRE GP)

I RJ45 connection (RS-232, VCM 232)

M ST 100-Mbps Ethernet dual fiber interface inc. IEC 61850

N RTD glass fiber interface for 857-RAA (857-VCMRTD)

(2)

(2) Required for connection to the 857-RAA scanner only.

Optional Hardware (Communication port 2)

ANone

C RJ45 connection (RS-232, 857-VCM232)

D RS-485 interface (2-wire, 857-VCM485-2)

L Built-in RJ45 10 Mbps Ethernet interface

(1)

M Built-in RJ45 10 Mbps Ethernet interface inc. IEC 61850

(1)

(1) Cannot order in combination with the following optional Communication PORT 1:

(M) ST 100-Mbps Ethernet fiber interface with IEC 61850.

N RTD interface for 857-RAA (Glass fiber, 857-VCMRTD)

(2)

(2) Required for connection to the 857-RAA scanner only.

Ingress Protection Rating

- IP30 (Standard)

I IP54 (Optional)

C Ip30 (standard case) with conformal coated boards

K IP54 (dust-tight case) with conformal coated boards

Position

1234567

857 – 3 C 6 A A A –__

abcdefg

12 Rockwell Automation Publication 857-QS001B-EN-P - April 2017

Chapter 1 Overview

Notes:

Rockwell Automation Publication 857-QS001B-EN-P - April 2017 13

Chapter 2

Mounting and Wiring Instructions

Mounting Instructions

To mount the Allen-Bradley® 857 Protection System, follow the sequence of

steps as they are outlined in the Figure 1

. Figure 2 shows the dimensions of the

unit.

Figure 1 - Mounting Instructions

1.0-10mm

193

139

14 Rockwell Automation Publication 857-QS001B-EN-P - April 2017

Chapter 2 Mounting and Wiring Instructions

Figure 2 - Dimensions

137 mm

(5.4 in.)

28 mm

(1.1 in.)

181 mm

(7.13 in.)

27 mm

(1.07 in.)

1.0…10.0 mm

(0.04…0.4 in.)

190 mm

(7.48 in.)

150 mm

(5.9 in.)

208 mm

(8.19 in.)

21 mm

(0.83 in.)

Collar Part Number A B

857-VYX076 40 mm (1.57 in.) 169 mm (6.65 in.)

857-VYX077 60 mm (2.36 in.) 149 mm (5.87 in.)

857-VYX233 100 mm (3.94 in.) 109 mm (4.29 in.)

Optional Projection Mounting Collar

Rockwell Automation Publication 857-QS001B-EN-P - April 2017 15

Mounting and Wiring Instructions Chapter 2

Measuring and Control

Connections

Allen-Bradley 857 Protection Relay is connected to the protected object

through these measuring and control connections.

The following terminal connections are shown in this quick start:

• Te r m i n a l X 1 L e f t S i d e

on page 16

• Te r m i n a l X 1 R i g h t S i d e on page 16

• Te r m i n a l X 2 on page 16

• Te r m i n a l X 3 on page 17

• Te r m i n a l X 7 on page 17

• Terminal X8 Model 857-3C7 on page 18

• Terminal X8 Model 857-3C8 on page 19

• Te r m i n a l X 6 on page 19

• Terminal X6 with DI19/DI20 Option

on page 20

Figure 3 - Example of Allen-Bradley 857 Back Panel Communication Connection

IMPORTANT Some cards configurations are optional

IMPORTANT Settings that are associated with options or accessories, such as RTD

scanners require the option or accessory to be installed or connected before

being made available for configuration

REMOTE

(TTL)

Communication Option 1

Communication Option 2

16 Rockwell Automation Publication 857-QS001B-EN-P - April 2017

Chapter 2 Mounting and Wiring Instructions

Table 2 - Terminal X1 Left Side

Table 3 - Terminal X1 Right Side

Table 4 - Terminal X2

No: Symbol Description

1 IL1(S1) Phase current L1 (S1)

3 IL2(S1) Phase current L2 (S1)

5 IL3(S1) Phase current L3 (S1)

7 Io1/1A(S1) Residual current I/O1(S1)

9 Io2/5A(S1) Residual current I/O2(S1)

11 Ua See Voltage Measurement Mode

on page 20

13 Ub See Voltage Measurement Mode on page 20

15 -- --

17 Uc See Voltage Measurement Mode on page 20

19 -- --

No: Symbol Description

2 IL1(S2) Phase current L1 (S2)

4 IL2(S2) Phase current L2 (S2)

6 IL3(S2) Phase current L3 (S2)

8 Io1/1A(S2) Residual current I/O1 (S2)

10 Io2/5A(S2) Residual current I/O2 (S2)

12 Ua See Voltage Measurement Mode

on page 20

14 Ub See Voltage Measurement Mode on page 20

16 -- --

18 Uc See Voltage Measurement Mode on page 20

20 -- --

No: Symbol Description

1 A5 Alarm relay 5

2 A5 Alarm relay 5

3 A4 Alarm relay 4

4 A4 Alarm relay 4

5 A3 Alarm relay 3

6 A3 Alarm relay 3

7 A2 Alarm relay 2

8 A2 Alarm relay 2

9 IF COM Internal fault relay, common connector

10 IF NC Internal fault relay, normal closed connector

11 IF NO Internal fault relay, normal open connector

Rockwell Automation Publication 857-QS001B-EN-P - April 2017 17

Mounting and Wiring Instructions Chapter 2

Table 5 - Terminal X3

Table 6 - Terminal X7

No: Symbol Description

1 48V Internal control voltage for digital inputs 1…6

2 DI1 Digital input 1

3 DI2 Digital input 2

4 DI3 Digital input 3

5 DI4 Digital input 4

6 DI5 Digital input 5

7 DI6 Digital input 6

8-- --

9 A1 COM Alarm relay 1, common connector

10 A1 NO Alarm relay 1, normal open connector

11 A1 NC Alarm relay 1, normal closed connector

12 T2 Trip relay 2

13 T2 Trip relay 2

14 T1 Trip relay 1

15 T1 Trip relay 1

16 -- --

17 Uaux Auxiliary voltage

18 Uaux Auxiliary voltage

No: Symbol Description

1 DI7 Digital input 7

2 DI8 Digital input 8

3 DI9 Digital input 9

4 DI10 Digital input 10

5 DI11 Digital input 11

6 DI12 Digital input 12

7 COM1 Common potential of digital inputs 7…12

8 DI13 Digital input 13

9 DI14 Digital input 14

10 DI15 Digital input 15

11 DI16 Digital input 16

12 D117 Digital input 17

13 DI18 Digital input 18

14 COM2 Common potential of digital inputs 13…18

15 T4 Trip relay 4

16 T4 Trip relay 4

17 T3 Trip relay 3

18 T3 Trip relay 3

18 Rockwell Automation Publication 857-QS001B-EN-P - April 2017

Chapter 2 Mounting and Wiring Instructions

Table 7 - Terminal X8 Model 857-3C7

No: Symbol Description

1 DI21 Digital input 21

2 DI22 Digital input 22

3 COM1 Common potential of digital inputs 21…2

4 DI23 Digital input 23

5 DI24 Digital input 24

6 COM2 Common potential of digital inputs 23…24

7 DI25 Digital input 25

8 DI26 Digital input 26

9 COM3 Common potential of digital inputs 25…26

10 DI27 Digital input 27

11 DI28 Digital input 28

12 COM4 Common potential of digital inputs 27…28

13 T8 Trip relay 8 / Digital input 32

14 T8 Trip relay 8 / Digital input 32

15 T7 Trip relay 7 / Digital input 31

16 T7 Trip relay 7 / Digital input 31

17 T6 Trip relay 6 / Digital input 30

18 T6 Trip relay 6 / Digital input 30

19 T5 Trip relay 5 / Digital input 29

20 T5 Trip relay 5 / Digital input 29

Rockwell Automation Publication 857-QS001B-EN-P - April 2017 19

Mounting and Wiring Instructions Chapter 2

Table 8 - Terminal X8 Model 857-3C8

Table 9 - Terminal X6

Available only when arc flash option is selected.

No: Symbol Description

1 DI21 Trip relay 14

2 DI22 Trip relay 14

3 COM1 Trip relay 13

4 DI23 Trip relay 13

5 DI24 Trip relay 12

6 COM2 Trip relay 12

7 DI25 Trip relay 11

8 DI26 Trip relay 11

9 COM3 Trip relay 10

10 DI27 Trip relay 10

11 DI28 Trip relay 9

12 COM4 Trip relay 9

13 T8 Trip relay 8 / Digital input 32

14 T8 Trip relay 8 / Digital input 32

15 T7 Trip relay 7 / Digital input 31

16 T7 Trip relay 7 / Digital input 31

17 T6 Trip relay 6 / Digital input 30

18 T6 Trip relay 6 / Digital input 30

19 T5 Trip relay 5 / Digital input 29

20 T5 Trip relay 5 / Digital input 29

No: Symbol Description

1BI External arc light input

2 BO Arc light output

3 COM Common connector of arc light I/O

4 S1>+ Arc sensor 1, positive connector

(1)

(1) Arc sensor itself is polarity free.

5 S1>– Arc sensor 1, negative connector

(1)

6 S2>+ Arc sensor 2, positive connector

(1)

7 S2>– Arc sensor 2, negative connector

(1)

20 Rockwell Automation Publication 857-QS001B-EN-P - April 2017

Chapter 2 Mounting and Wiring Instructions

Table 10 - Terminal X6 with DI19/DI20 Option

Voltage Measurement Mode

The 857 Protection System can be connected to line-to-line or phase-to-

ground voltages. The connection is dependent on the application and available

voltage transformers. Set the configuration parameter “Voltage measurement

mode” according to the used connection.

Table 11 - Available Voltage Modes

The overvoltage protection is based on the line-to-line voltage regardless of the

measurement mode.

The wiring of the secondary circuits of voltage transformers to the device

terminal depends on the selected voltage-measuring mode.

No: Symbol Description

1 DI19 Digital input 19

2 DI19 Digital input 19

3 DI20 Digital input 20

4 DI20 Digital input 20

5— —

6 S1>+ Arc sensor 1, positive connector

(1)

(1) Arc sensor itself is polarity free.

7 S1>– Arc sensor 1, negative connector

(1)

Mode Description

“2LL+U

” The device is connected to line-to-line voltages U

(X1-11 and X1-12) and U

(X1-13 and

X1-14). Also to zero sequence voltage U

(X1-17 and X1-18). The phase-to-ground

voltages are calculated. The network must use only three wires. Any neutral wire must not

exist (two PTs/VTs in open Delta).

“3LN” The device is connected to phase-to-ground voltages U

(X1-11 and X1-12), U

(X1-13

and X1-14), and U

(X1-17 and X1-18). The zero sequence voltage is calculated. A neutral

wire can exist (three PTs/VTs “Y” connected).

“1LL+U

/LLy” This mode is used with the Synchrocheck function. See Chapter 3, Synchrocheck Protection

(25) of the user guide for more information.

2LL/LLy” This mode is used with the Synchrocheck function. See Chapter 3, Synchrocheck Protection

(25) of the user guide for more information.

“LL/LLy/LLz” This mode is used with the Synchrocheck function. See Chapter 3

, Synchrocheck Protection

(25) of the user guide for more information.

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Allen-Bradley 857, A Series Quick start guide

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