Siemens 7SR105 Rho User manual

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7SR105 Rho User Manual
Motor Protection Relay
Reyrolle
Protection
Devices

Siemens Protection Devices 2

7SR105 Rho Contents
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
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 other cause. Any and all such liability is disclaimed.
©2018 Siemens Protection Devices
Contents
Technical Manual Chapters
1. Description of Operation
2. Settings, Configuration & Instruments
3. Performance Specification
4. Data Communications
5. Installation
6. Commissioning and Maintenance
7. Applications Guide

7SR105 Rho Description Of Operation
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
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 other cause. Any and all such liability is disclaimed.
©2018 Siemens Protection Devices
7SR105 Rho
Description of Operation
Document Release History
This document is issue 2018/09. The list of revisions up to and including this issue is:
2018/09 Third Issue
2016/06 Second Issue
2015/12 First Issue
Software Revision History
2018/09 2437H80007 R4h-1c Third Release
2016/06 2437H80007 R4c-1b Second Release
2015/12 2437H80007 R4b-1a First Release
Hardware Revision History
2015/12 7SR105/BB First Release

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Contents
Section 1: Introduction .......................................................................................................................................6
1.1 Current Transformer Circuits ..............................................................................................................6
1.2 External Resistors..............................................................................................................................6
1.3 Description ........................................................................................................................................6
1.4 Ordering Options ...............................................................................................................................7
1.5 Functional Diagram............................................................................................................................8
1.6 Terminal Diagram ..............................................................................................................................9
1.6.1 Terminal Diagram with Control Push Buttons ........................................................................9
Section 2: Hardware Description ......................................................................................................................10
2.1 General ...........................................................................................................................................10
2.2 Front Fascia ....................................................................................................................................11
2.2.1 Front Fascia with Control Push Buttons...............................................................................11
2.3 Start Motor/Stop Motor.....................................................................................................................11
2.4 Power Supply Unit (PSU).................................................................................................................12
2.5 Connectors......................................................................................................................................12
2.5.1 Connectors without Temperature Inputs..............................................................................13
2.5.2 Connectors with Temperature Inputs...................................................................................13
2.6 Relay Information ............................................................................................................................14
2.7 Operator Interface............................................................................................................................15
2.7.1 Liquid Crystal Display (LCD) ...............................................................................................15
2.7.2 LCD Indication ...................................................................................................................15
2.7.3 Standard Keys ...................................................................................................................16
2.7.4 Protection Healthy LED ......................................................................................................16
2.7.5 Indication LEDs..................................................................................................................16
2.8 Current Inputs..................................................................................................................................17
2.9 Binary Inputs ...................................................................................................................................18
2.10 Binary Outputs (Output Relays)........................................................................................................18
2.11 Virtual Input/Outputs ........................................................................................................................19
2.12 Self Monitoring ................................................................................................................................20
2.12.1 Protection Healthy/Defective...............................................................................................21
Section 3: Protection Functions ........................................................................................................................22
3.1 Thermal Protection ..........................................................................................................................22
3.1.1 Thermal Protection: Overload (49) ......................................................................................24
3.1.2 Thermal Protection: Stall Protection (14) .............................................................................27
3.1.3 Thermal Protection: Start Protection (48, 66).......................................................................28
3.1.4 Thermal Protection: Phase Unbalance (46) .........................................................................30
3.2 Current Protection: Undercurrent (37)...............................................................................................33
3.3 Current Protection: Phase Overcurrent (50, 51) ................................................................................33
3.3.1 Instantaneous Overcurrent Protection (50) ..........................................................................33
3.3.2 Time Delayed Overcurrent Protection (51) ..........................................................................34
3.4 Current Protection: Derived Earth Fault (50N, 51N)...........................................................................35
3.4.1 Instantaneous Derived Earth Fault Protection (50N) ............................................................35
3.4.2 Time Delayed Derived Earth Fault Protection (51N).............................................................36
3.5 Current Protection: Measured Earth Fault (50G, 51G).......................................................................36
3.5.1 Instantaneous Measured Earth Fault Protection (50G).........................................................36
3.5.2 Time Delayed Measured Earth Fault Protection (51G) .........................................................37
Section 4: Supervision Functions......................................................................................................................38
4.1 Break Capacity Limit (50BCL) ..........................................................................................................38
4.2 Anti-Backspin (81B) .........................................................................................................................39
4.3 Phase Reversal (46 PH REV) ..........................................................................................................40
4.4 Trip Circuit Supervision (74TCS) ......................................................................................................41
4.5 Close Circuit Supervision (74CCS) ...................................................................................................41
4.6 Circuit Breaker Failure (50BF) ..........................................................................................................42
4.7 Temperature Inputs (TEMP).............................................................................................................43

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Section 5: Control and Logic Functions.............................................................................................................44
5.1 Motor Start/Stop ..............................................................................................................................44
Emergency Start..............................................................................................................................45
5.2 User Logic .......................................................................................................................................47
5.2.1 Quick Logic........................................................................................................................47
Section 6: Other Features ................................................................................................................................49
6.1 Data Communications......................................................................................................................49
6.1.1 Communication Ports .........................................................................................................49
6.2 CB Maintenance ..............................................................................................................................52
6.2.1 Output Matrix Test..............................................................................................................52
6.2.2 CB Counters ......................................................................................................................52
6.2.3 I2t CB Wear........................................................................................................................52
6.3 Data Storage ...................................................................................................................................53
6.3.1 General..............................................................................................................................53
6.3.2 Demand.............................................................................................................................53
6.3.3 Event Records ...................................................................................................................53
6.3.4 Waveform Records.............................................................................................................53
6.3.5 Fault Records.....................................................................................................................54
6.3.6 Disk Activity Warning..........................................................................................................54
6.4 Metering ..........................................................................................................................................54
6.5 Operating Mode...............................................................................................................................55
6.6 Control Mode...................................................................................................................................55
6.7 Real Time Clock ..............................................................................................................................56
6.7.1 Time Synchronisation – Data Communication Interface .......................................................56
6.7.2 Time Synchronisation – Binary Input ...................................................................................56
6.8 Settings Groups...............................................................................................................................56
6.9 Password Feature............................................................................................................................56

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List of Figures
Figure 1-1 Functional Diagram of 7SR105 Rho Motor Protection Relay ................................................................8
Figure 2-1 7SR105 Rho Motor Protection Relay with control push buttons ..........................................................11
Figure 2-2 7SR105 Rho Motor Protection Relay Connectors without Temperature Inputs....................................13
Figure 2-3 7SR105 Rho Motor Protection Relay Connectors with Temperature Inputs.........................................13
Figure 2-4 Relay Rating Label ...........................................................................................................................14
Figure 2-5 Fascia Relay Rating Label ................................................................................................................14
Figure 2-6 Safety Symbols ................................................................................................................................15
Figure 2-7 Close up of Relay Identifier...............................................................................................................15
Figure 2-9 Binary Input Logic.............................................................................................................................18
Figure 2-10 Binary Output Logic..........................................................................................................................19
Figure 2-11 Start-up Counter Meter .....................................................................................................................20
Figure 2-12 Unexpected Restarts Lockout Text....................................................................................................20
Figure 2-13 Start-up Events ................................................................................................................................21
Figure 3.1-1 Thermal Overload Heating and Cooling Characteristic .......................................................................22
Figure 3-2 Logic Diagram: Motor Thermal Overload Protection (49)....................................................................25
Figure 3.1-3 Application of Thermal Overload Time Constants ..............................................................................26
Figure 3-4 Stall Protection (14)..........................................................................................................................27
Figure 3-5 Number of Starts Protection (66).......................................................................................................28
Figure 3-6 Start Time Supervision (48) ..............................................................................................................29
Figure 3-7 Inverse Time Characteristic for Unbalance Protection ........................................................................30
Figure 3-8 Logic Diagram : NPS Phase Unbalance (46NPS) ..............................................................................31
Figure 3-9 Logic Diagram: Phase Difference Phase Unbalance (46PD) ..............................................................32
Figure 3-10 Logic Diagram: Undercurrent Detector (37) .......................................................................................33
Figure 3-11 Logic Diagram: Instantaneous Overcurrent Element ..........................................................................34
Figure 3-12 Logic Diagram: Time Delayed Overcurrent Element...........................................................................35
Figure 3-13 Logic Diagram: Derived Instantaneous Earth Fault Element...............................................................35
Figure 3-14 Logic Diagram: Derived Time Delayed Earth Fault Protection ............................................................36
Figure 3-15 Logic Diagram: Measured Instantaneous Earth-fault Element ............................................................37
Figure 3-16 Logic Diagram: Measured Time Delayed Earth Fault Element (51G) ..................................................37
Figure 4-1 Logic Diagram: Breaking Capacity Limit (50BCL)...............................................................................38
Figure 4-2 Logic Diagram: Anti-Backspin Protection (81B)..................................................................................39
Figure 4-3 Logic Diagram: Phase Reversal Detection (46 PH REV)....................................................................40
Figure 4-4 Logic Diagram: Trip Circuit Supervision Feature (74TCS) ..................................................................41
Figure 4-5 Logic Diagram: Close Circuit Supervision Feature (74CCS) ...............................................................41
Figure 4-6 Logic Diagram: Circuit Breaker Fail Protection (50BF) .......................................................................42
Figure 5-1 Logic Diagram: Circuit Breaker Status...............................................................................................45
Figure 5-2 Logic Diagram: Motor Control ...........................................................................................................46
Figure 5-3 Sequence Diagram: Quick Logic PU/DO Timers (Counter Reset Mode Off)........................................47
Figure 6-1 Communication to Front USB Port ....................................................................................................49
Figure 6-2 Connect Icon....................................................................................................................................49
Figure 6-3 Port Selection in Connection Manager ..............................................................................................50
Figure 6-4 System Information Icon ...................................................................................................................50
Figure 6-5 System Information Icon ...................................................................................................................51
Figure 6-6 Communication to Multiple Devices from Control System using RS485 ..............................................52
List of Tables
Table 2-1 Summary of 7SR105 Rho Motor Protection Relay Configurations.......................................................10
Table 3-1 Application of Thermal Time Constants .............................................................................................22
Table 6-1 Operation Mode ...............................................................................................................................55

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Symbols and Nomenclature
The following notational and formatting conventions are used within the remainder of this document:
•Setting Menu Location MAIN MENU>SUB-MENU
•Setting: Elem name -Setting
•Setting value: value
•Alternatives: [1st] [2nd] [3rd]

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Section 1: Introduction
This manual is applicable to the following relay:
•7SR105 Rho Motor Protection relay
General Safety Precautions
1.1 Current Transformer Circuits
The secondary circuit of a live CT must not be open circuited. Non-observance of this precaution can
result in injury to personnel or damage to equipment.
1.2 External Resistors
Where external resistors are connected to the relay circuitry, these may present a danger of electric
shock or burns, if touched.
1.3 Description
The 7SR105 Rho Motor Protection Relay is developed by using the latest generation of hardware technology.
7SR105 is a member of Siemens Reyrolle®protection devices Rho product family.
The 7SR105 Rho Motor Protection Relay is housed in a 4U high, size 4 non draw-out case and these relays
provide protection, monitoring, instrumentation, and metering with integrated input and output logic, data logging
and fault reports.
Communication access to the relay functionality is via a front USB port for local PC connection or rear electrical
RS485 (optional) port for remote connection.
!
!

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1.4 Ordering Options
Product description
Variants
Order No.
7SR105 Rho
7
S
R
1
0
5
-
-
A
0
Motor Protection Relay
Case, I/O and Fascia
Size 4 Moulded case, 4CT, 6 Binary Inputs/
6 Binary Outputs, 10 LEDs
3
Measuring input
1/5 A, 50 Hz
2
Auxiliary voltage
AC/DC 60 to 240 V, Binary input
threshold 44 V AC/V DC
L
DC 24 to 60 V, Binary input threshold
19 V DC
J
1
Protective Cover
Standard version – No Cover
A
Communication
Front Port : USB and Rear Port: RS-485
supporting IEC 60870-5-103 or Modbus
RTU or DNP 3.0
2
Temperature Input
Without RTD
1
E
6 RTD Input
2
F
Front Fascia
Standard Version – with Breaker
Control Push Buttons
2
Protection Function Packages
E
Standard version - included in all
models
14 Stall Protection
37 Undercurrent
46 Phase Unbalance Protection
46PhRev Phase Reversal
48/66 Start Protection
49 Thermal Overload
50/51 Overcurrent
50/51, GN Earth fault
50BCL Break Capacity Limit
50BF Circuit Breaker Fail
74T/CCS Trip/Close Circuit Supervision
81B Anti Backspin
CB Counters
I˄2T CB Wears
Programmable Logic
Standard Version Plus
Additional Function in
Temperature Input version
model
F

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1.5 Functional Diagram
M
3
1
50
BCL
50
(x2)
48/
66
46Ph
Rev
37
( x2)49
14
(x4)
51
(x2)
50
BF
50N 51N 46NPS
50G 51G50 G
BF
86 74T/
CCS
7SR105
81B TEMP
Figure 1-1 Functional Diagram of 7SR105 Rho Motor Protection Relay

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1.6 Terminal Diagram
The relay is housed in a non draw-out case 4U high Size 4 case. The rear connection comprises of user-friendly
pluggable type terminals for BI, BO, communication, and power supply wire connections.
The CT terminals are suitable for ring type lug connection and to provide a secure and reliable termination.
1.6.1 Terminal Diagram with Control Push Buttons
Fig 8. Terminal/Wiring Diagram View (Non RTD)
Fig 9. Terminal/Wiring Diagram View (RTD)

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Section 2: Hardware Description
2.1 General
The structure of the relay is based upon the compact hardware platform. The relays are supplied in a Size 4 case.
The hardware design provides a commonality between the products and components across the range of relays.
Table 2-1 Summary of 7SR105 Rho Motor Protection Relay Configurations
The 7SR105 Rho Motor Protection Relays are assembled from the following modules:
1. Front Fascia with 9 configurable LEDs and 1 Relay Healthy LED
2. Processor module
3. Current Analogue, Input module and Output module
4 x Current (Terminal X5)
6 x Binary Input (Terminal X1)
6 x Binary Outputs (Terminal X4)
4. Communication and Power Supply module
RS485 (Terminal X2)
Power supply (Terminal X3)
5. Temperature Inputs
With control push buttons
6 x Temp Inputs (Terminal X6 and X7)
Relay Current
Inputs
Voltage
Inputs
Binary
Inputs
Binary
Outputs
Temperature
Inputs
LEDs
7SR1053-
XXXX-
2EA0
4 0 6 6 0 10
7SR1053-
XXXX-
2FA0
4 0 6 6 6 10

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2.2 Front Fascia
The front fascia is an integral part of the relay and allows the user to access all the push buttons and performs the
setting changes and control actions. The fascia provides an option to reset the fault data display, latched binary
outputs, and LEDs by using the TEST/RESET► button. The front fascia contains the label strip which provides
the information about LED indicators.
Front Fascia consists of CB control push buttons to open and close.
2.2.1 Front Fascia with Control Push Buttons
Figure 2-1 7SR105 Rho Motor Protection Relay with control push buttons
2.3 Start Motor/Stop Motor
The Motor control function is used to manually start and stop the motor when it is connected to the network. Two
dedicated push buttons are provided on the HMI to execute the motor manual start and stop operations.
Button
Function
Description
Start Press Start button and confirm ENTER to execute the start
operation of motor.
Stop Press Stop button and confirm ENTER to execute the stop
operation of motor.
The user can configure the binary input, binary output, and LED configuration for the motor start and stop control
functions.
To perform the motor start and stop control operations, follow the procedure given below:
1. Apply CB Close Binary Input (BI) to get the breaker status.
2. Press STOP MOTOR control key. The confirmation pop-up appears.

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3. Press ENTER key to confirm.
4. The Stop delay count-down starts and reaches to zero.
5. The configured BO and LEDs for the STOP MOTOR control functions will operate.
6. Press RESET button to reset LED and BO states.
Repeat the same procedure for START MOTOR control logic operation.
NOTE:
If the "Control Password" is already configured in the settings, use the control password to execute the Motor
Start/Stop via control keys. For more information about the Control Password function, see Section 6.9
NOTE:
If the operating mode of 7SR105 Rho Motor Protection Relay is “Remote”, the user can perform the Motor
Start/Stop operations when the “FUNCTION KEY CONFIG” setting is enabled.
2.4 Power Supply Unit (PSU)
The relay is supplied with the following nominal power supply ranges:
•44 V AC/DC BI threshold available with 60 V to 240 V AC/DC power supply version
•19 V DC BI threshold with 24 V to 60 V DC power supply version
The power supply module is equipped with 6 Binary Inputs. It also consists of one RS485 communication
interface (half duplex) for communicating with RTUs and parameterization of relays via remote locations.
For AC connections, the auxiliary supply is made with the live connection to positive terminal and neutral
connection to negative for consistency and safety.
In the event of the supply voltage levels are falling below the relay minimum operate level, the PSU will
automatically switch off itself and latch out and this prevents any PSU overload conditions occurring. The PSU is
reset by switching the auxiliary supply off and on.
2.5 Connectors
In 7SR105 Rho Motor Protection Relay, all the connectors are pluggable type except the CT connectors and it
consists of Binary Inputs and Binary Outputs connectors. The connector terminals are designated suitably.

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2.5.1 Connectors without Temperature Inputs
BINARY OUTPUT
CT
POWER SUPPLY
RS485
BINARY INPUT
Figure 2-2 7SR105 Rho Motor Protection Relay Connectors without Temperature Inputs
2.5.2 Connectors with Temperature Inputs
BINARY OUTPUT
CT
POWER SUPPLY
RS485
BINARY INPUT
TEMPERATURE INPUT
TEMPERATURE INPUT
Figure 2-3 7SR105 Rho Motor Protection Relay Connectors with Temperature Inputs

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2.6 Relay Information
The rating label is located on the housing and provides more technical information about the 7SR105 Rho Motor
Protection Relay.
Relay Information
The rating label contains the following product Information:
•Product name
•MLFB ordering code, with hardware version suffix
•Nominal current rating
•Rated frequency
•Auxiliary supply rating
•Binary input supply rating
•Serial number
Figure 2-4 Relay Rating Label
Figure 2-5 Fascia Relay Rating Label
For safety reasons, the following symbols are displayed on the label.

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Figure 2-6 Safety Symbols
2.7 Operator Interface
2.7.1 Liquid Crystal Display (LCD)
A 4 line by 20-character alpha-numeric liquid crystal display indicates settings, instrumentation, fault data, and
control commands.
To conserve power, the display backlighting is extinguished when no buttons are pressed for a user-defined
period. The ‘backlight timer’ setting within the “SYSTEM CONFIG” menu allows the timeout to be adjusted from 1
to 60 minutes and “Off” (backlight permanently on). Pressing any key will reactivate the display.
User-defined identifying text can be programmed into the relay by using the System config/Relay Identifier and
System config/Circuit Identifier setting. The ‘Identifier’ texts are displayed on the LCD display in two lines at the
top level of the menu structure. The ‘Relay Identifier’ is used in communication with Reydisp to identify the relay.
By pressing the Cancel button several times will return the user to this screen.
Figure 2-7 Close up of Relay Identifier
2.7.2 LCD Indication
General Alarms are user defined text messages displayed on the LCD when mapped to binary inputs or virtual
inputs. Up to six general alarms of 16 characters can be programmed, each triggered from one or more input.
Each general alarm will also generate an event.
If multiple alarms are activated simultaneously, the messages are displayed on a separate page in a
rolling display on the LCD. The System Config > General Alarm Alert setting Enabled/Disabled allows the user
to select if the alarms are to be displayed on the LCD when active.
All general alarms are raised when a fault trigger is generated and will be logged into the Fault Data record.

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2.7.3 Standard Keys
The relay is supplied as standard with five push buttons. The buttons are used to navigate the menu structure and
control the relay functions. They are labelled:
▲
Increases a setting or moves up menu.
▼Decreases a setting or moves down menu.
TEST/RESET►Moves right, can be used to reset selected functionality and for LED test (at relay
identifier screen).
ENTER
Used to initiate and accept settings changes.
CANCEL Used to cancel settings changes and/or move up the menu structure by one
level per press.
START
Used to start the motor
STOP
Used to stop the motor
NOTE:
All settings and configuration of LEDs, BI and BO can be accessed and set by the user using these keys.
Alternatively, the configuration/settings files can be loaded into the relay using ‘Reydisp’ software. When the
System Config > Setting Dependencies is ENABLED, only the functions that are enabled will appear in the
menu structure.
2.7.4 Protection Healthy LED
This green LED is steadily illuminated to indicate that auxiliary voltage has been applied to the relay power supply
and that the relay is operating correctly. If the internal relay watchdog detects an internal fault then the LED will
continuously flash.
2.7.5 Indication LEDs
Relays have 9 user programmable LED indicators. Each LED can be programmed to be illuminated as either
green, orange, or red. Where an LED is programmed to be lit both red and green, it will illuminate yellow. The
same LED can be assigned two different colours dependent upon whether a Start/Pickup or Operate condition
exists. LED’s can be assigned to the pickup condition and colour selected in the OUTPUT CONFIG > LED
CONFIG menu.
Functions are assigned to the LEDs in the OUTPUT CONFIG > OUTPUT MATRIX menu.
Each LED can be labelled by inserting a label strip into the pocket behind the front fascia. A ‘template’ is available
in the Reydisp software tool to allow users to create and print customised legends.
Each LED can be programmed as hand reset or self reset. Hand reset LEDs can be reset either by pressing the
TEST/RESET ► button, energising a suitably programmed binary input or by sending an appropriate command
over the data communications channel(s).
The status of hand reset LEDs is maintained by a back up storage capacitor in the event of an interruption to the
supply voltage.

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Figure 2-8 LED Indication Label
2.8 Current Inputs
Four current inputs are provided on the Analogue Input module. Terminals are available for both 1 A and 5 A
inputs.
The current input is incorporated within the relay and is used for phase fault and earth fault protection.
Current is sampled at 1600 Hz for both 50 Hz and 60 Hz system frequencies. Protection and monitoring functions
of the relay use either the Fundamental Frequency RMS or the True RMS value of current appropriate to the
individual function.
The waveform recorder samples and displays current input waveforms at 1600 Hz.
The primary CT ratio used for the relay instruments can be set in the CT/VT configuration menu.