Siemens SIRIUS 3RT2,SIRIUS 3RA28 User Manual
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Industrial Controls
Switchgear
SIRIUS 3RA28 function modules for
mounting on 3RT2 contactors
Manual
02/2019
A5E03656507620A/RS
Introduction
1
Standards
2
Product description
3
Product combinations
4
Functions
5
Configuration
6
Mounting
7
Connection
8
Operation
9
Accessories
10
Technical data
11
Circuit diagrams
12
References
A
Dimension drawings
B
-AD/005
Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
3ZX1012-0RA28-5AC1
Ⓟ
Copyright © Siemens AG 2009.
All rights reserved
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
02/2019 Subject to change
Table of contents
1 Introduction ............................................................................................................................................. 5
1.1 Responsibility of the user for system configuration and functionality ....................................... 5
1.2 Purpose of the manual .............................................................................................................. 5
1.3 Required basic knowledge ........................................................................................................ 6
1.4 Scope of the manual ................................................................................................................. 6
1.5 Siemens Industry Online Support ............................................................................................. 7
1.6 Further documentation .............................................................................................................. 8
1.7 DataMatrix code ........................................................................................................................ 9
1.8 Siemens Industry Online Support app .................................................................................... 10
1.9 Recycling and disposal ........................................................................................................... 11
1.10 Support Request ..................................................................................................................... 11
2 Standards ............................................................................................................................................. 13
3 Product description ............................................................................................................................... 15
3.1 Device versions ....................................................................................................................... 17
3.2 Performance features ............................................................................................................. 19
3.3 Applications ............................................................................................................................. 20
3.3.1 Function modules for direct-on-line start ................................................................................ 20
3.3.2 Function modules for star-delta (wye-delta) start ................................................................... 21
3.4 3RA28 function modules ......................................................................................................... 24
4 Product combinations ............................................................................................................................ 25
5 Functions .............................................................................................................................................. 27
5.1 Overvoltage protection ............................................................................................................ 27
5.2 Time-delayed switching of contactors ..................................................................................... 27
5.2.1 Response delay ...................................................................................................................... 27
5.2.2 OFF-delay with control signal ................................................................................................. 29
5.2.3 OFF-delay without control signal ............................................................................................ 31
5.2.4 Star-delta (wye-delta) function ................................................................................................ 32
6 Configuration ........................................................................................................................................ 33
6.1 SIRIUS system configurator ................................................................................................... 33
6.2 Configuration ........................................................................................................................... 34
7 Mounting ............................................................................................................................................... 39
7.1 Mounting instructions .............................................................................................................. 39
7.2 Minimum clearances and mounting position .......................................................................... 39
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Table of contents
7.3 Mounting ................................................................................................................................ 40
7.3.1 Function modules for direct-on-line start (electronic timing relay with semiconductor
output/solid-state time-delay auxiliary switch) ....................................................................... 40
7.3.2 Function module for star-delta (wye-delta) start .................................................................... 42
7.4 Disassembly ........................................................................................................................... 49
7.4.1 Function modules for direct-on-line start (solid-state timing relay with semiconductor
output/solid-state time-delay auxiliary switch) ....................................................................... 49
7.4.2 Function module for star-delta (wye-delta) start .................................................................... 51
7.5 Replacing the removable terminal ......................................................................................... 53
8 Connection ........................................................................................................................................... 55
8.1 Connecting the function modules for direct-on-line start ....................................................... 55
8.1.1 Connecting the solid-state timing relay with semiconductor output ....................................... 55
8.1.2 Connecting the solid-state time-delay auxiliary switch .......................................................... 57
8.2 Connecting the function module for star-delta (wye-delta) start ............................................ 59
8.3 Conductor cross-sections ...................................................................................................... 60
8.3.1 Conductor cross-sections for screw-type connection systems .............................................. 60
8.3.2 Conductor cross-sections for spring-loaded connection systems ......................................... 61
9 Operation .............................................................................................................................................. 63
9.1 Setting the times .................................................................................................................... 63
10 Accessories .......................................................................................................................................... 65
10.1 Sealable cover ....................................................................................................................... 65
11 Technical data ...................................................................................................................................... 67
11.1 Technical data in Siemens Industry Online Support .............................................................. 67
12 Circuit diagrams .................................................................................................................................... 69
12.1 CAx data ................................................................................................................................ 69
12.2 Internal circuit diagrams ......................................................................................................... 70
12.3 Typical circuits ........................................................................................................................ 71
A References ........................................................................................................................................... 73
A.1 References ............................................................................................................................. 73
A.2 Manuals - SIRIUS Modular System ....................................................................................... 74
B Dimension drawings .............................................................................................................................. 77
B.1 CAx data ................................................................................................................................ 77
B.2 Dimensions in mm.................................................................................................................. 78
B.3 Solid-state timing relays with semiconductor output and solid-state time-delay auxiliary
switches ................................................................................................................................. 78
B.4 Star-delta (wye-delta) modules .............................................................................................. 80
Index .................................................................................................................................................... 83
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1
Note
Comply in each case with the valid
configuring the system.
1.1 Responsibility of the user for system configuration and functionality
The function modules described here have been developed to carry out different control
tasks as part of a plant or machine. The function modules are available for direct-on-line
start, reversing start and star-delta (wye-delta) start.
Siemens AG, its regional offices, and associated companies (hereinafter referred to as
"Siemens") cannot guarantee all the properties of an overall installation or machine that has
not been designed by Siemens.
Nor can Siemens assume liability for recommendations that appear or are implied in the
following description. No new guarantee, warranty, or liability claims beyond the scope of the
Siemens general terms of supply are to be derived or inferred from the following description.
1.2 Purpose of the manual
This manual describes the SIRIUS 3RA28 function modules for mounting on SIRIUS
3RT2 contactors and provides the following information:
● Information for integrating the function modules into the system environment.
● Information on necessary hardware components.
● Information on installing, connecting and operating the function modules.
● Technical information such as dimension drawings and unit wiring diagrams.
The information in this manual enables you to configure and commission the function
modules.
national assembly regulations and standards when
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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5
Introduction
1.3 Required basic knowledge
1.3 Required basic knowledge
To understand these operating instructions you should have a general knowledge of
automation engineering and low-voltage controls.
1.4 Scope of the manual
The manual is valid for the described function modules. It contains a description of the
devices that are valid at the time of publication.
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Introduction
1.5 Siemens Industry Online Support
1.5 Siemens Industry Online Support
Information and Service
In Siemens Industry Online Support, you can obtain up-to-date information from our global
support database quickly and simply. To accompany our products and systems, we offer a
wealth of information and services that provide support in every phase of the lifecycle of your
machine or plant – from planning and implementation, through commissioning, up to
maintenance and modernization:
● Product support
● Application examples
● Services
● Forum
● mySupport
Link: Siemens Industry Online Support (https://support.industry.siemens.com/cs/ww/en/)
Product support
You will find here all the information and comprehensive know-how covering all aspects of
your product:
●
FAQs
Our answers to frequently asked questions.
●
Manuals/operating instructions
Read online or download, available as PDF or individually configurable.
●
Certificates
Clearly sorted according to approving authority, type and country.
●
Characteristic curves
For support in planning and configuring your system.
●
Product announcements
The latest information and news concerning our products.
●
Downloads
You can find here updates, service packs, HSPs and much more for your product.
●
Application examples
Function blocks, background and system descriptions, performance statements,
demonstration systems, and application examples, clearly explained and represented.
●
Technical data
Technical product data for support in planning and implementing your project.
Link: Product support (https://support.industry.siemens.com/cs/ww/en/ps)
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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7
Introduction
1.6 Further documentation
mySupport
With "mySupport", your personal workspace, you get the very best out of your Industry
Online Support. Everything to enable you to find the right information every time.
The following functions are now available:
●
Personal messages
Your personal mailbox for exchanging information and managing your contacts
●
Inquiries
Use our online form for specific solution suggestions, or send your technical inquiry
directly to a specialist in Technical Support
Notifications
●
Make sure you always have the latest information - individually tailored to your needs
●
Filters
Simple management and re-use of your filter settings from Product Support and the
Technical Forum
Favorites / Tags
●
Create your own knowledge database by assigning "Favorites" and "Tags" to documents
– simply and efficiently
Entries last viewed
●
Clear presentation of your last viewed entries
●
Documentation
Configure your individual documentation from different manuals – quickly and without
complications
Personal data
●
Change personal data and contact information here
●
CAx data
Simple access to thousands of items of CAx data such as 3D models, 2D dimension
drawings, EPLAN macros and much more
1.6 Further documentation
To install and connect the function modules, you require the operating instructions of the
function modules used.
You can find a list of operating instructions and an overview of the manuals pertaining to the
SIRIUS modular system in the appendix "References (Page 73)".
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Introduction
1P
Article number
+
S
1P
Article number
+
S
(+ 23S MAC address)
1P
Article number
+
S
(+ 23S MAC address)
Note
The information content is displayed without spaces.
1.7 DataMatrix code
1.7 DataMatrix code
A DataMatrix code is lasered on the front of all units of the function modules, on the left on
the basic module.
In the case of basic and coupling modules, there is a further DataMatrix code behind the
labeling plate.
DataMatrix codes are standardized in ISO/IEC 16022. The DataMatrix codes on Siemens
devices use ECC200 coding for powerful error correction.
The following device information is encoded in the front DataMatrix code as a bit stream:
● Article number
● Serial number (abbreviated)
This information is stored in the following format in the DataMatrix code:
Data identifier Net content Separator Serial number
The following device information is encoded in the front DataMatrix code behind the labeling
plate as a bit stream:
● Article number
● Serial number
● Where appropriate, MAC address
This information is stored in the following format in the DataMatrix code:
Data identifier Net content Separator Serial number
The following device information is encoded in the side rating plate as a bit stream:
● Article number
● Serial number
● Where appropriate, MAC address
This information is stored in the following format in the DataMatrix code:
Data identifier Net content Separator Serial number
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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Introduction
Link for Android
Link for iOS
Link for Windows Phone
1.8 Siemens Industry Online Support app
This machine-readable information simplifies and accelerates handling of the respective
devices.
As well as fast access to the serial numbers of the respective devices for unique
identification, the DataMatrix codes simplify communication with Siemens Technical Support.
1.8 Siemens Industry Online Support app
Siemens Industry Online Support app
You can use the Siemens Industry Online Support app to access all the device-specific
information available on the Siemens Industry Online Support portal for a particular article
number, including operating instructions, manuals, datasheets, FAQs etc.
The Siemens Industry Online Support app is available for iOS, Android or Windows Phone
devices. You can download the app from the following links:
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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Introduction
Support Request:
Internet (https://support.industry.siemens.com/My/ww/en/requests)
1.9 Recycling and disposal
1.9 Recycling and disposal
For environmentally friendly recycling and disposal of your old device, please contact a
company certified for the disposal of old electrical and/or electronic devices and dispose of
the device in accordance with the regulations in your country.
1.10 Support Request
Using the Support Request form in Online Support you can send your query directly to our
Technical Assistance. After describing your query in a few guided steps, you will immediately
be provided with possible suggestions for solving the problem.
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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Introduction
1.10 Support Request
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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2
General regulations
Explanation
Applicable regulations, standards, and approvals
The following general regulations and standards apply for the 3RA28 function modules:
Reference
• IEC 61812-1
• DIN VDE 0435 Part 2021
• IEC 61000-6-2
• IEC 61000-6-4
• IEC 60947-5-1
• DIN VDE 0660 Part 200
• IEC 60721-3-1
• IEC 60721-3-3
• IEC 60529
• CE
• UL
• CSA
• CCC
• C-Tick
• Marine approval
SIRIUS components have been approved by a whole range of bodies for various sectors
(shipbuilding, etc.). More information and certificates for download are available on the
Internet (https://support.industry.siemens.com/cs/ww/en/ps/16131/cert).
Electrical relays, timing relays
Electromagnetic compatibility
Low-voltage switchgear and controlgear
Environmental conditions
Degree of protection
The timing relays have UL and CSA approval for
use all over the world. They have also been prototype-tested by the GL, LRS, and DM shipbuilding companies.
Reference
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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The standards from Catalog IC 10 "SIRIUS Industrial Controls" in the appendix always apply.
You will find extracts from the most important standards relating to the SIRIUS modular
system in the Internet (http://www.siemens.com/sirius/support) ("SIRIUS - System
Overview", Article Number: 3ZX1012-0RA01-5AC1).
13
Standards
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Product description
3
Applications
Function modules
Solid-state time-delay auxiliary switches
Function module for star-delta (wye-delta) start
Function modules for AS-Interface
Function modules for IO-Link
Function
Function modules are used to perform various control jobs on automatic production lines and
for processing machines. They are suited to all time-delayed switching operations in control,
starting, protection, and regulation circuits, and ensure a high degree of repeat accuracy for
delay times, once they have been set.
The function modules are subdivided into function modules with communication interfacing
and function modules without communication interfacing.
3RA28 function modules Electronic timing relays with semiconductor
output
3RA27 function modules with communication
connection
This chapter describes 3RA28 function modules without a communication connection. You
will find information about function modules with a communication connection in the
corresponding manuals.
Function modules are used to delay switching functions.
System integration
The 3RA28 function modules have been matched to the contactors in the 3RT2 series and to
the contactor relays in the 3RH2 series
integrated in the feeders by directly mounting them on contactors. The function modules can
be used for size S00, S0, S2 and S3 contactors.
The 3RA27 function modules can only be used for communication-capable contactors.
1)
The 3RA28 function modules must not be mounted on 3RH2 coupling relays.
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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1)
both electrically and mechanically, and can be
15
Product description
More information ...
Can be found in ...
/en/39318922)" manual (3ZX1012-0RA27-0AC0)
/en/39319600)" manual (3ZX1012-0RA27-1AC1)
Assemblies" manual
Connection system
Users can choose either function modules with screw-type connection system or function
modules with spring-loaded connection system.
Reference
About 3RA27 function modules for AS-Interface "SIRIUS - SIRIUS 3RA2712 function modules for
AS-Interface
(http://support.automation.siemens.com/WW/view
About 3RA27 function modules for IO-Link "SIRIUS - SIRIUS 3RA2711 function modules for
IO-Link
(http://support.automation.siemens.com/WW/view
About function modules for reversing start Appendix entitled "References" under "Manuals -
SIRIUS Modular System (Page 74)" in the
"SIRIUS - SIRIUS 3RT Contactors/Contactor
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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Product description
Characteristic
Versions
Function modules for direct-on-line start
Function module for
star-delta (wye-delta) start
Electronic timing relay with semiconductor output
Solid-state time-delay auxiliary
switches
trol signal
with/without control signal
contactors.
S3 contactors.
Width
45 mm
135 mm (3 x 45 mm)
loaded connection systems)
3.1 Device versions
3.1 Device versions
Device versions
● Function modules for direct-on-line start
– Solid-state timing relays with semiconductor output
– Solid-state time-delay auxiliary switches
● Function modules for star-delta (wye-delta) start
Characteristics
The table below provides an overview of the versions of 3RA28 function modules for
mounting on 3RT2 contactors and 3RH2 contactor relays
1)
The 3RA28 function modules must not be mounted on 3RH2 coupling relays.
Function ON-delay and OFF-delay with con-
Article numbers
Size For size S00, S0
Connection
system
3RA2811-.CW10/
3RA2812-.DW10
Screw-type, spring-loaded Without terminals (can be used for
3RA2831-.D.10/
3RA2832-.D.10
For size S2 and
1)
.
ON and OFF-delay
3RA2813-..W10/
3RA2814-..W10/
3RA2815-..W10
One module for size S00, S0, S2 and S3 contactors.
Star-delta (wye-delta) function
3RA2816-0EW20 comprising:
1 basic module
2 coupling modules
contactor screw-type and spring-
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Product description
Article number
Function
Output
Screw connection
3RA2812-1DW10
OFF-delay with control signal
PowerMos
3RA2831-1DG10
ON-delay
PowerMos
3RA2831-1DH10
ON-delay
PowerMos
3RA2832-1DG10
OFF-delay with control signal
PowerMos
3RA2832-1DH10
OFF-delay with control signal
PowerMos
3RA2813-1AW10
ON-delay
1 CO contact
1 NC contact
3RA2814-1AW10
OFF-delay with control signal
1 CO contact
1 NC contact
3RA2815-1AW10
OFF-delay without control signal
1 CO contact
1 NC contact
Spring-loaded connection
3RA2811-2CW10
ON-delay, two-wire
Thyristor
3RA2812-2DW10
OFF-delay with control signal
PowerMos
3RA2831-2DG10
ON-delay
PowerMos
3RA2831-2DH10
ON-delay
PowerMos
3RA2832-2DG10
OFF-delay with control signal
PowerMos
3RA2832-2DH10
OFF-delay with control signal
PowerMos
3RA2813-2AW10
ON-delay
1 CO contact
1 NC contact
3RA2814-2AW10
OFF-delay with control signal
1 CO contact
1 NC contact
3RA2815-2AW10
OFF-delay without control signal
1 CO contact
1 NC contact
Plug-in, without terminals
(internal)
3RA2910-0
Sealable cover cap
—
The 8th digit of the article number
0: No terminals
1: Screw
2: Spring-loaded terminals
3.1 Device versions
3RA28 version overview
3RA2811-1CW10 ON-delay, two-wire Thyristor
3RA2813-1FW10 ON-delay 1 NO contact
3RA2814-1FW10 OFF-delay with control signal 1 NO contact
3RA2815-1FW10 OFF-delay without control signal 1 NO contact
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3RA2813-2FW10 ON-delay 1 NO contact
3RA2814-2FW10 OFF-delay with control signal 1 NO contact
3RA2815-2FW10 OFF-delay without control signal 1 NO contact
3RA2816-0EW20 Star-delta (wye-delta) function module 2 NO contacts
designates the terminal type:
-type terminals
3.2 Performance features
Function module
Features
Features
The function modules have the following features:
Product description
3.2 Performance features
Function modules
for direct-on-line
start
Function modules
for star-delta (wyedelta) start
Electronic timing relays
with semiconductor
output
Solid-state time-delay
auxiliary switches
Star-delta (wye-delta)
start
• ON-delay (1 NO contact)
• OFF-delay with control signal (1 NO contact)
• Versions with screw-type and spring-loaded connection systems
• ON-delay (1 NO contact + 1 NC contact or 1 CO contact)
• ON-delay with/without control signal (1 NO contact + 1 NC contact or
1 CO contact)
• Versions with screw-type and spring-loaded connection systems
• Control exclusively via contactor A1/A2 – no further control circuit
wiring required
• No control current wiring thanks to plug-in technology and connecting
cables
• Interchange proof construction
• Timing function for switching over from star to delta in basic module
• Electrical interlock without additional wiring
• Changeover delay time set to a non-adjustable value of ≥ 50 ms
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Product description
S00
S0
S2
S3
3RA2811, 3RA2812
X X -
-
3RA2813, 3RA2814, 3RA2815
X X X
X
More information ...
Is available in ...
3.3 Applications
3.3 Applications
3.3.1 Function modules for direct-on-line start
Applications
The function modules for direct-on-line start are used for the time-delayed switching of
contactors. The following function modules are available:
● Electronic timing relay with semiconductor output
● Solid-state time-delay auxiliary switch with 1 CO contact or 1 NC contact/1 NO contact
Features of direct-on-line starters
The function module for direct-on-line start has the following features:
● All modules with wide control voltage range
Reference
● Integrated varistor (surge suppressor)
● Applicable for size S00, S0, S2 and S3 contactors.
The following table is an overview of which function modules you can use for which size
of contactors.
3RA2831, 3RA2832 - - X X
● Large wide voltage range (24 ... 240 V AC/DC), except for 3RA2831, 3RA2832
● Extended operating ranges (24 ... 90 V, 90 ... 240 V), for 3RA2831 and 3RA2832 only
● 3 selectable time ranges (1 s, 10 s, 100 s)
● Operating time adjustment from 5 ... 100% per time range
● Switch position indicator for the contactor below (plunger)
About application areas Chapter entitled "Configuration (Page 33)"
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Product description
3.3 Applications
3.3.2 Function modules for star-delta (wye-delta) start
Applications
The function module for star-delta (wye-delta) start is used to switch from star (wye) to delta
operation.
Features
The function module for star-delta (wye-delta) start has the following features:
● All modules with wide control voltage range
● Integrated varistor (surge suppressor)
● One module kit for contactor screw-type and spring-loaded connection systems
● One module kit for S00, S0, S2 and S3 size contactors
(options only with main circuit connecting comb)
● Large wide voltage range (24 to 240 V AC/DC) and
● 3 selectable time ranges (10 s, 30 s, 60 s)
● Operating time adjustment from 5 to 100% per time range (corresponds to 0.5 s to 60 s)
● Changeover delay set to a non-adjustable value of ≥ 50 ms
● Switch position indication for the contactor below in the form of a mechanical switch
position indicator (plunger)
● Control exclusively via A1/A2 on the line contactor below
● No further wiring required
The wide voltage and the wide time range ensure advanced use of the function modules.
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Product description
3.3 Applications
3RA2816-0EW20 function module for contactor assemblies for star-delta (wye-delta) start
The function module for plugging into contactor assemblies for star-delta (wye-delta) start for
sizes S00, S0, S2 and S3 comprises the following devices:
● 1 basic module with time setting
● 2 coupling modules with corresponding connecting cable to coupling or function module
Figure 3-1 Star-delta (wye-delta) starter, completely assembled
The function module replaces the entire control circuit wiring and combines the functions of
the following devices and tasks:
● Timing relay star-delta (wye-delta) function
● Auxiliary switches
● Auxiliary conductor wiring
● Electrical interlock
● Switch position indicator for the contactor below (plunger)
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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Product description
Note
Fitting of auxiliary switches
When the 3RA2816
following applies:
No more than one 3RH29
E03 and higher) may
be mounted onto the line contactor
3.3 Applications
-0EW20 function module for star-delta (wye-delta) start is used, the
lateral auxiliary switch block (product version
(Q11) and onto the star (wye) contactor (Q12).
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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Product description
1
Timing relay attachment
2
Time range selector switch:
Sets the time base (1 s, 10 s, 100 s)
3
Operating time adjustment switch:
Sets the relative time (5 to 100%)
4
Mechanical plunger:
Indicates the switching state of the contactor
spring-loaded connections.
1
Basic module with integrated control logic
2
Coupling module
Coupling module: Controls the contactor below
4
Ribbon cable:
Electrical connection of modules
5
Slot for connecting cable:
Routes the supply voltage and electrical interlock
6
Time range selector switch:
Sets the time base (10 s, 30 s, 60 s)
7
Operating time adjustment switch:
Sets the relative time (5 to 100%)
8
Mechanical plunger:
Indicates the switching state of the contactor
3.4 3RA28 function modules
3.4 3RA28 function modules
Function module for direct-on-line start (electronic timing relays with semiconductor output/solid-state
time-delay auxiliary switches)
5 Screw/spring-loaded terminals: The terminals are available as both screw-type and
Figure 3-2 Electronic timing relays with semiconductor output/solid-state time-delay auxiliary
switches
Function module for star-delta (wye-delta) start
The function module for star-delta (wye-delta) start comprises a basic module with integrated
control logic and two coupling modules of the same type.
3 Coil control: Basic module: Voltage measurement at the line contactor
Figure 3-3 Basic module and coupling modules for the contactor assembly for star-delta (wye-delta)
start
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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4
More information ...
Can be found in the appendix ...
view" manual
Contactors/Contactor Assemblies" manual
Product combinations
Since the products from the innovative SIRIUS modular system are matched to one another
both electrically and mechanically, they can be combined quickly and easily.
The 3RA28 function modules are designed for size S00, S0, S2 and S3 contactors. The
operating range of the 3RA28 function modules is 0.85 to 1.1 Us. You can mount the
function modules on the front of SIRIUS 3RT2/3RH2 contactors or 3RA24 contactor
assemblies.
3RA24 pre-wired assemblies are available for star-delta (wye-delta) start.
Reference
About the possible combinations of standard
products from the SIRIUS modular system
About the pre-wired contactor assembly for stardelta (wye-delta) start
"References" under Manuals - SIRIUS Modular
System (Page 74) in the "SIRIUS - System Over-
"References" under "Manuals - SIRIUS Modular
System (Page 74)" in the "SIRIUS - SIRIUS 3RT
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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25
Product combinations
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
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