Wabtec RMS Mors Smitt 1S20 User manual

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1S20 User Guide
Arc Fault Monitor
RMS Mors Smitt
Advanced Protection Devices
User Guide

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1S20
User Guide
About This Manual
This User Guide covers all 1S20 relays manufactured from July 2023. Earlier relays do not
necessarily incorporate all the features described. Our policy of continuous development means that
extra features & functionality may have been added.
The 1S20 User Guide is designed as a generic document to describe the common operating
parameters for all relays built on this platform.
The copyright and other intellectual property rights in this document, and in any model or article produced from
it (and including anyregistered or unregistered design rights) are the property of RMS Mors Smitt. No part of
this document shall be reproduced or modified or stored in another form, in any data retrieval system, without
the permission of RMS Mors Smitt, nor shall any model or article be reproduced from this document without
consent from RMS Mors Smitt.
While the information and guidance given in this document is believed to be correct, no liability shall be
accepted for any loss or damage caused by any error or omission, whether such error or omission is the
result of negligence or any othercause. Any and allsuch liabilityis disclaimed.
Contact Us
RMS Mors Smitt
19 Southern Court • Keysborough 3173 • AUSTRALIA
Phone [phone]
Email [e-mail] • Web http://www.morssmitt.com/rms

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Contents
Technical Bulletin ..................................................................................................................................5
User Guide ............................................................................................................................................5
Mounting Arrangements........................................................................................................................6
Sensor Variants.....................................................................................................................................6
Front Layout ..........................................................................................................................................7
1S20 Connection diagram.....................................................................................................................8
Example Schematic...............................................................................................................................9
Available Configuration Settings .........................................................................................................11
Surface Mount Only Variant ................................................................................................................12
Panel Mount or Surface Mount Variant...............................................................................................14
DIN Rail Mounting Kit..........................................................................................................................16
Sensor Spacing...................................................................................................................................17
Sensor Placement...............................................................................................................................19
Sensor Mounting .................................................................................................................................19
Example Sensor Placement................................................................................................................20
Commissioning Preliminaries..............................................................................................................24
Site Commissioning Verification Checklist..........................................................................................25
System Power Up....................................................................................................................................25
SUPERVISION Output Verification..........................................................................................................25
Arc Trip Testing.......................................................................................................................................26
ARC Trip Trouble Shooting......................................................................................................................27
Handling of Electronic Equipment.......................................................................................................28
Safety Section .....................................................................................................................................29
Explanation of Symbols & Labels........................................................................................................29
Equipment Operating Conditions ........................................................................................................30
Equipment Connections ......................................................................................................................30
Decommissioning & Disposal..............................................................................................................31
Contents .......................................................................................................................... 3
Documentation................................................................................................................ 5
Introduction..................................................................................................................... 6
1S20 Variants .................................................................................................................. 6
1S20 Indications.............................................................................................................. 7
Scheme Wiring................................................................................................................ 8
Function Configuration ................................................................................................ 10
1S20 Dimensions and Mounting Arrangements......................................................... 12
Sensor Installation........................................................................................................ 17
Commissioning............................................................................................................. 24
Installation..................................................................................................................... 28

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Mechanical Inspection.........................................................................................................................32
Trip Check...........................................................................................................................................32
Defect Report Form.............................................................................................................................33
Maintenance.................................................................................................................. 32

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Documentation
Technical Bulletin
The detailed technical attributes, functional description & performance specifications for the 1S20
are described in the product Technical Bulletin.
The order of precedence for product information is as follows:
•Technical Bulletin
•User Guide
User Guide
This User Guide covers all 1S20 relay versions & describes the generic features & attributes
common across all versions.
Different relay versions are required to cater for varying customer requirements such as auxiliary
voltage range, I/O configuration, case style, relay functionality etc.

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Introduction
The 1S20 monitors either one, two or three 1S30 optical sensors to detect the presence of an arcing
fault within Metal Clad air insulated switchgear.
The 1S20 provides 2 zones or common Arc Fault trip outputs and continuously supervises the optical
sensors to ensure maximum availability of the Arc Fault Protection scheme.
Upon detection of an arc the 1S20 can either initiate or directly trip circuit breakers to affect fault
clearance.
1S20 Variants
The 1S20 is available in several voltage ranges, mounting arrangements and either 2 or 3 optical point
sensor variants.
Mounting Arrangements
1S20 - #A# Panel mount or surface mount
1S20 - #C# Panel mount or surface mount with DINrail kit supplied
1S20 - #B# Surface mount only
1S20 - #D# Surfacemount only with DIN rail kit supplied
Sensor Variants
1S20 - ##A Maximum of two 1S30 sensors connected
1S20 - ##B Maximum of three 1S30 sensors connected

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1S20 Indications
Front Layout
The pictures below depict the two styles of user interface:
Panel Mount or Surface mount
Surface Mount Only
A single tri colour LED provides the following status indications:

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Scheme Wiring
1S20 Connection diagram
The above diagram shows the 1S20 connections.
The 1S20 is ordered as either a 2 or 3 sensor version.
Sensor connection is not polarity sensitive.

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Example Schematic
The following typical schematic shows how the 1S20 may be wired to direct trip a circuit breaker
tripping.
CIRCUIT BREAKER
TRIPCOIL
+ POS
1S20
CIRCUIT BREAKER SHOWN IN THE
OPEN POSITION AND RELAY SHOWN
IN THEDE-ENERGISED STATE
52a
12 2 4 6
+ NEG
Arc F ault
Trip 1
Arc F ault
Trip 2 Fail Alarm
Sensor
Inputs
Arc Sensor 1
Common
Arc Sensor 2 & 3
10
9
8
11 1 3 5

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Function Configuration
The 1S20 configuration switches are accessible to the user by unplugging the electronic module
from the terminal base as shown below:
Note: Switch 5 is not fitted on 2 sensor variants

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Available Configuration Settings
Note: Switch 5 is not fitted on 2 sensor variants
On all variants Arc sensor 1 must be connected otherwise a sensor supervision alarm will
assert.

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1S20 Dimensions and Mounting Arrangements
Surface Mount Only Variant

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Surface mounting detail
DIN rail mounting detail

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Panel Mount or Surface Mount Variant

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Panel mounting cut out detail
Surface mounting detail

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DIN rail mounting detail
DIN Rail Mounting Kit

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Sensor Installation
Sensor Spacing
The 1S30 sensor is available as a single detector or dual detector package.
The 1S30A single detector version is depicted below showingthe location of the detection window and
the approximate coverage zone :
The recommended spacing for the 1S30A single detectors is approximately 5 - 6 m to ensure
adequate detection overlap.
3m
Detection window
Coverage Zone
5 - 6 m

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The 1S30B Dual detector version provides an additional detection window for dual zones of coverage
as depicted below :
The recommended spacing for the 1S30B single detectors is approximately 5 - 6 m to ensure
adequate detection overlap, this combination provides an overall coverage zone of approximately 10 -
12 m.
Detection windows
6m
10 - 12m

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The 1S30A and 1S30B sensors may also be mixed to provide various coverage combinations, again
spacings of approximately 5 - 6 m should be observed to ensure adequate detection overlap.
Sensor Placement
Sensors need to be mounted to provide full coverage of the switchgear cubicles to be protected. Where
the protected zone is larger than the sensor coverage then the use of multiple sensors is required.
Precise positioning of the sensors is generally not required as the light caused by the arc is reflected
from the switchgear walls.
Sensor Mounting
The 1S30 is suitable for flush panel mounting in a number of configurations, for further information
on mounting arrangements and mounting hardware refer to the 1S30 Technical Bulletin.
10 - 12m

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Example Sensor Placement
The following are some typical examples of sensor placement.
Sensor placement inside the CB racking chamber
Sensor placement inside the busbar chamber