ABB RET 670 User manual

Type
User manual
Innovation from ABB
Operator's manual
Transformer protection IED
RET 670
Document ID: 1MRK504049-UEN
Issued: December 2007
Revision: D
IED product version: 1.B
© Copyright 2007 ABB. All rights reserved
COPYRIGHT
WE RESERVE ALL RIGHTS TO THIS DOCUMENT, EVEN IN THE EVENT
THAT A PATENT IS ISSUED AND A DIFFERENT COMMERCIAL
PROPRIETARY RIGHT IS REGISTERED. IMPROPER USE, IN
PARTICULAR REPRODUCTION AND DISSEMINATION TO THIRD
PARTIES, IS NOT PERMITTED.
THIS DOCUMENT HAS BEEN CAREFULLY CHECKED. HOWEVER, IN
CASE ANY ERRORS ARE DETECTED, THE READER IS KINDLY
REQUESTED TO NOTIFY THE MANUFACTURER AT THE ADDRESS
BELOW.
THE DATA CONTAINED IN THIS MANUAL IS INTENDED SOLELY FOR
THE CONCEPT OR PRODUCT DESCRIPTION AND IS NOT TO BE
DEEMED TO BE A STATEMENT OF GUARANTEED PROPERTIES. IN
THE INTEREST OF OUR CUSTOMERS, WE CONSTANTLY SEEK TO
ENSURE THAT OUR PRODUCTS ARE DEVELOPED TO THE LATEST
TECHNOLOGICAL STANDARDS. AS A RESULT, IT IS POSSIBLE THAT
THERE MAY BE SOME DIFFERENCES BETWEEN THE HW/SW
PRODUCT AND THIS INFORMATION PRODUCT.
Manufacturer:
ABB AB
Substation Automation Products
SE-721 59 Västerås
Sweden
Telephone: +46 (0) 21 34 20 00
Facsimile: +46 (0) 21 14 69 18
www.abb.com/substationautomation
Table of contents
Section 1 Introduction.......................................................................9
Introduction to the operator’s manual.................................................9
About the complete set of manuals for an IED..............................9
About the operator’s manual.......................................................10
Intended audience.......................................................................10
Related documents......................................................................11
Revision notes.............................................................................12
Section 2 Safety information..........................................................13
Warnings..........................................................................................13
Section 3 Overview........................................................................15
Operator overview............................................................................15
Identify the IED.................................................................................15
Section 4 Understand the local human-machine interface.............17
Overview...........................................................................................17
Keypad.............................................................................................18
Key activated screens......................................................................19
The Help screen..........................................................................19
The Reset screen........................................................................19
LCD..................................................................................................20
Small............................................................................................20
Medium........................................................................................20
LED...................................................................................................20
Status indication LEDs................................................................20
Indication LEDs...........................................................................20
How to navigate................................................................................21
Read............................................................................................21
Change .......................................................................................22
Control.........................................................................................22
Section 5 Understand the HMI tree................................................23
Overview...........................................................................................23
Section 6 Read measured values..................................................25
Overview...........................................................................................25
View analog primary values..............................................................26
Overview......................................................................................26
View analog secondary values.........................................................26
Overview......................................................................................26
Table of contents
RET 670 Operator's manual
1MRK504049-UEN rev. D
1
View analog mean values.................................................................26
Overview......................................................................................26
mA input module (MIM)..........................................................26
Signal matrix for mA inputs (SMMI)........................................27
View monitoring values.....................................................................27
Service values.............................................................................27
Current phasors...........................................................................27
Voltage phasors...........................................................................27
Current sequence component.....................................................27
Voltage sequence component.....................................................28
View metering values.......................................................................28
Section 7 Event list.........................................................................29
View events......................................................................................29
Overview......................................................................................29
Section 8 Handle disturbances.......................................................31
Identify a disturbance.......................................................................31
View disturbance record details........................................................31
View general information.............................................................31
View disturbance indications.......................................................31
View event recordings.................................................................31
View trip values...........................................................................32
Trigger a disturbance report manually..............................................32
Section 9 Read and change settings.............................................33
System time and synchronization.....................................................33
System time.................................................................................33
Time synchronization...................................................................33
Overview................................................................................33
TimeSynch.............................................................................33
TimeSynchBIN.......................................................................33
TimeSynchSNTP....................................................................34
TimeSynchDSTBegin.............................................................34
TimeSynchDSTEnd................................................................34
TimeZone...............................................................................34
General settings...............................................................................34
Power system..............................................................................34
Overview................................................................................34
Identifiers................................................................................34
Primary values........................................................................35
Three phase analog group.....................................................35
Three phase analog summation group...................................35
Communication............................................................................35
Table of contents
2 Operator's manual
1MRK504049-UEN rev. D
RET 670
Overview................................................................................35
TCP-IP ...................................................................................35
SPA, LON and IEC 60870–5–103 settings.............................36
LDCM.....................................................................................37
Station communication...........................................................37
Analog modules...........................................................................38
Overview................................................................................38
Analog modules......................................................................38
I/O modules............................................................................38
HMI..............................................................................................39
Overview................................................................................39
LEDs.......................................................................................39
Screen ...................................................................................39
Functions................................................................................39
Reference channel service values.........................................39
Change lock...........................................................................40
Differential protection...................................................................40
Overview................................................................................40
Transformer differential protection, two winding (PDIF,
87T) .......................................................................................40
Transformer differential protection, three winding (PDIF,
87T) .......................................................................................40
Control.........................................................................................40
Overview................................................................................40
Bay control (QCBAY).............................................................40
Reservation input (RESIN).....................................................41
Bay reserve (QCRSV)............................................................41
Switch controller (SCSWI)......................................................41
Circuit breaker (SXCBR)........................................................41
Circuit switch (SXSWI)...........................................................41
Local/Remote switch (LocalRemote, LocRemControl)...........41
Control commands......................................................................42
Single command.....................................................................42
Monitoring....................................................................................42
Overview................................................................................42
Measurements (MMXU).........................................................42
Current phasors......................................................................42
Voltage phasors.....................................................................42
Current sequence components (MSQI)..................................42
Voltage sequence components (MSQI).................................43
Disturbance report (RDRE)....................................................43
Binary signals.........................................................................43
Analog signals........................................................................43
Generic measured value........................................................43
Table of contents
RET 670 Operator's manual
1MRK504049-UEN rev. D
3
Event function.........................................................................43
Binary signal status report......................................................44
IEC 60870–5–103...................................................................44
Metering.......................................................................................44
Overview................................................................................44
Pulse counter logic (GGIO)....................................................44
Setting group N.................................................................................45
Overview......................................................................................45
Differential protection...................................................................45
Overview................................................................................45
Transformer differential protection, two winding (PDIF,
87T) .......................................................................................45
Transformer differential protection, three winding (PDIF,
87T) .......................................................................................45
Restricted earth fault protection (PDIF, 87N).........................45
High impedance differential protection (PDIF, 87X)...............46
Distance protection......................................................................46
Overview................................................................................46
Distance protection zones (PDIS, 21)....................................46
Phase selection with load encroachment (PDIS, 21).............46
Directional impedance (RDIR)................................................46
Power swing detection (RPSB, 78)........................................46
Automatic switch onto fault logic (PSOF)...............................47
Current protection........................................................................47
Overview................................................................................47
Instantaneous phase overcurrent protection (PIOC, 50)........47
Four step phase overcurrent protection (POCM, 51/67)........47
Instantaneous residual overcurrent protection (PIOC,
50N)........................................................................................47
Four step residual overcurrent protection (PEFM, 51N/
67N)........................................................................................48
Thermal overload protection, two time constants (PTTR,
49) .........................................................................................48
Breaker failure protection (RBRF, 50BF)...............................48
Pole discordance protection (RPLD, 52PD)...........................48
Voltage protection........................................................................48
Overview................................................................................48
Two step undervoltage protection (PUVM, 27)......................48
Two step overvoltage protection (POVM, 59)........................49
Two step residual overvoltage protection (POVM, 59N)........49
Overexcitation protection (PVPH, 24)....................................49
Frequency protection...................................................................49
Overview................................................................................49
Underfrequency protection (PTUF, 81)..................................49
Table of contents
4 Operator's manual
1MRK504049-UEN rev. D
RET 670
Overfrequency protection (PTOF, 81)....................................49
Rate-of-change frequency protection (PFRC, 81)..................50
Multipurpose protection...............................................................50
Overview................................................................................50
General current and voltage protection (PGPF).....................50
Secondary system supervision....................................................50
Overview................................................................................50
Current circuit supervision (RDIF)..........................................50
Fuse failure supervision (RFUF)............................................51
Control.........................................................................................51
Overview................................................................................51
Synchrocheck and energizing check (RSYN, 25)..................51
Logic............................................................................................51
Overview................................................................................51
Tripping logic (PTRC, 94).......................................................51
Trip matrix logic (GGIO, 94)...................................................51
LogicGate...............................................................................52
LogicSRMemory.....................................................................52
LogicTimerSet........................................................................52
Monitoring....................................................................................52
Overview................................................................................52
Activate setting group.......................................................................52
Language..........................................................................................52
Section 10 Diagnose IED status.......................................................53
Find cause of internal failure............................................................53
Read internal events....................................................................53
Find available functions...............................................................53
Section 11 Test the IED...................................................................55
Overview...........................................................................................55
IED test mode...................................................................................56
View binary input values...................................................................56
Overview......................................................................................56
Binary Input Module (BIM)......................................................56
Signal matrix for binary input (SMBI)......................................57
View binary output values.................................................................57
Overview......................................................................................57
Binary Output Module (BOM).................................................57
Signal matrix for binary outputs (SMBO)................................57
Function test modes.........................................................................57
Differential protection...................................................................57
Distance protection......................................................................57
Current protection........................................................................58
Table of contents
RET 670 Operator's manual
1MRK504049-UEN rev. D
5
Voltage communication...............................................................58
Frequency protection...................................................................58
Multipurpose protection...............................................................58
Secondary system protection......................................................58
Control.........................................................................................58
Logic............................................................................................58
Function status.................................................................................59
Overview......................................................................................59
View differential protection values...............................................59
Transformer differential protection, two winding (PDIF,
87T) .......................................................................................59
Transformer differential protection, three winding (PDIF,
87T) .......................................................................................59
Restricted earth fault protection (PDIF, 87N).........................59
High impedance differential protection (PDIF, 87X)...............60
Distance protection .....................................................................60
Phase selection with load encroachment (PDIS, 21).............60
Distance protection zones (PDIS, 21)....................................60
Power swing detection (RPSB, 78)........................................60
Automatic switch onto fault logic (PSOF)...............................60
Current protection........................................................................60
Instantaneous phase overcurrent protection (PIOC, 50)........61
Four step phase overcurrent protection (POCM, 51/67)........61
Four step single phase overcurrent protection (POCM,
51)..........................................................................................61
Instantaneous residual overcurrent protection (PIOC,
50N)........................................................................................61
Four step residual overcurrent protection (PEFM, 51N/
67N)........................................................................................61
Thermal overload protection, two time constants (PTTR,
49) .........................................................................................61
Breaker failure protection (RBRF, 50BF)...............................61
Breaker failure protection, single phase version (RBRF,
50BF) .....................................................................................62
Pole discordance protection (RPLD, 52PD)...........................62
Voltage protection........................................................................62
Two step undervoltage protection (PUVM, 27)......................62
Two step overvoltage protection (POVM, 59)........................62
Two step residual overvoltage protection (POVM, 59N)........62
Overexcitation protection (PVPH, 24)....................................62
View frequency protection values................................................63
Underfrequency protection (PTUF, 81)..................................63
Overfrequency protection (PTOF, 81)....................................63
Rate-of-change frequency protection (PFRC, 81)..................63
Table of contents
6 Operator's manual
1MRK504049-UEN rev. D
RET 670
Multipurpose protection...............................................................63
General current and voltage protection (PGPF).....................63
Secondary circuit supervision......................................................64
Current circuit supervision (RDIF)..........................................64
Fuse failure supervision (RFUF)............................................64
Control.........................................................................................64
Synchrocheck and energizing check (RSYN, 25)........................64
Apparatus control (APC)..............................................................65
Interlocking.............................................................................65
Interlock busbar earth switch..................................................65
Interlock bus section breaker.................................................65
Interlock bus section disconnect............................................65
Interlock bus coupler bay.......................................................65
Interlock, one and a half circuit breaker connection...............65
Interlock, one and a half circuit breaker line A.......................66
Interlock one and a half circuit breaker line B........................66
Interlock, double circuit breaker bus A...................................66
Interlock, double circuit breaker bus B...................................66
Interlock, double circuit breaker line.......................................66
Interlock line bay....................................................................66
Interlock, transformer bay.......................................................67
Switch controller.....................................................................67
Circuit breaker........................................................................67
Circuit switch (SXSWI)...........................................................67
Bay reserve............................................................................67
Reservation input (RESIN).....................................................68
Bay control (QCBAY).............................................................68
Commands..................................................................................68
Single command.....................................................................68
IEC60870–5–103....................................................................68
Logic............................................................................................69
Tripping logic (PTRC, 94).......................................................69
Event counter.........................................................................69
Trip matrix logic (GGIO, 94X).................................................69
Logic gate...............................................................................69
Logic pulse timer....................................................................69
Logic SR memory...................................................................69
Logic timer set........................................................................70
Monitoring....................................................................................70
Disturbance report (RDRE)....................................................70
Generic measured value (GGIO)...........................................70
Measured value expander block............................................70
LEDs.......................................................................................71
Table of contents
RET 670 Operator's manual
1MRK504049-UEN rev. D
7
Global positioning system......................................................71
Event function.........................................................................71
Binary signal status report......................................................71
Metering.......................................................................................71
Pulse counter logic (GGIO)....................................................71
Communications..........................................................................71
Remote communication..........................................................72
View station communication values.......................................72
View setting groups.....................................................................72
View test data..............................................................................73
Test LEDs.........................................................................................73
Section 12 Control and supervise the bay........................................75
Overview...........................................................................................75
Read measured values and check apparatus status...................75
Locating and using the single line diagram.................................75
Control screen messages............................................................77
Section 13 Reset..............................................................................79
Reset guide......................................................................................79
Reset LEDs.................................................................................79
Start and trip LEDs.................................................................79
All indication LEDs.................................................................79
Reset lockout...............................................................................79
Reset counters............................................................................80
Reset autorecloser.................................................................80
Circuit breaker........................................................................80
Circuit switch..........................................................................80
Event counter.........................................................................80
Reset pulse counter...............................................................80
LDCM clear counters..............................................................80
Reset temperature functions.......................................................81
Section 14 Authorization..................................................................83
Administrate users............................................................................83
Users................................................................................................84
Section 15 Glossary.........................................................................85
Glossary...........................................................................................85
Table of contents
8 Operator's manual
1MRK504049-UEN rev. D
RET 670
Section 1 Introduction
About this chapter
This chapter is an introduction to the operator’s manual, its purpose and usage.
1.1 Introduction to the operator’s manual
1.1.1 About the complete set of manuals for an IED
The user’s manual (UM) is a complete set of five different manuals:
en06000097.vsd
Application
manual
Technical
reference
manual
Installation and
commissioning
manual
Operator´s
manual
Engineering
guide
The Application Manual (AM) contains application descriptions, setting guidelines
and setting parameters sorted per function. The application manual should be used to
find out when and for what purpose a typical protection function could be used. The
manual should also be used when calculating settings.
The Technical Reference Manual (TRM) contains application and functionality
descriptions and it lists function blocks, logic diagrams, input and output signals,
setting parameters and technical data sorted per function. The technical reference
manual should be used as a technical reference during the engineering phase,
installation and commissioning phase, and during normal service.
The Installation and Commissioning Manual (ICM) contains instructions on how
to install and commission the protection IED. The manual can also be used as a
reference during periodic testing. The manual covers procedures for mechanical and
electrical installation, energizing and checking of external circuitry, setting and
configuration as well as verifying settings and performing directional tests. The
chapters are organized in the chronological order (indicated by chapter/section
numbers) in which the protection IED should be installed and commissioned.
The Operator’s Manual (OM) contains instructions on how to operate the protection
IED during normal service once it has been commissioned. The operator’s manual
can be used to find out how to handle disturbances or how to view calculated and
measured network data in order to determine the cause of a fault.
Section 1
Introduction
RET 670 Operator's manual
1MRK504049-UEN rev. D
9
The IED 670 engineering guide (EG) contains instructions on how to engineer the
IED 670 products. The manual guides to use the different tool components for IED
670 engineering. It also guides how to handle the tool component available to read
disturbance files from the IEDs on the basis of the IEC 61850 definitions. The third
part is an introduction about the diagnostic tool components available for IED 670
products and the PCM 600 tool.
1.1.2 About the operator’s manual
Use the operator’s manual for instruction on how to perform common tasks during
normal service.
The operator’s manual contains the following chapters:
The chapter “Safety information” presents warnings and notices, which the user
should pay attention to.
The chapter Overviewdescribes operations an operator may perform on a daily
basis or when the need arises.
The chapter “Understand the local human-machine interface” describes how to
use the human-machine interface.
The chapter “Understand the HMI tree” describes the different menu trees.
The chapter “Read measured values” describes how to locate and identify
available measurement data.
The chapter “Event list” describes the location and nature of recorded events.
The chapter “Handle disturbances” describes how to retrieve disturbance
information and reset alarms.
The chapter “Read and change settings” describes how to locate, and change
settings and parameters.
The chapter “Diagnose IED status” describes the location and use of available
diagnostic tools.
The chapter “Test the IED” describes the tests applicable to the IED.
The chapter “Control and supervise the bay” describes how to use the Single
Line Diagram to open and close primary apparatuses.
The chapter “Reset” describes resetting procedures.
The chapter “Authorization”describes user categories and password procedures.
The chapter “Glossary” describes words and acronyms used in the literature
describing the IED.
This manual does not contain any instructions for commissioning or testing.
1.1.3 Intended audience
General
The operator’s manual addresses the operator, who operates the IED on a daily basis.
Section 1
Introduction
10 Operator's manual
1MRK504049-UEN rev. D
RET 670
Requirement
The operator must be trained in and have a basic knowledge of how to operate
protection equipment. The manual contains terms and expressions commonly used
to describe this kind of equipment.
1.1.4 Related documents
Documents related to RET 670 Identity number
Operator’s manual 1MRK 504 049-UEN
Installation and commissioning manual 1MRK 504 050-UEN
Technical reference manual 1MRK 504 048-UEN
Application manual 1MRK 504 051-UEN
Buyer’s guide 1MRK 504 080-BEN
Connection diagram, Two winding transf. Single breaker arrangements 1MRK 002 801-LA
Connection diagram, Two winding transf. Multi breaker arrangements 1MRK 002 801-HA
Connection diagram, Three winding transf. Single breaker arrangements 1MRK 002 801-KA
Connection diagram, Three winding transf. Multi breaker arrangements 1MRK 002 801-GA
Configuration diagram A, Two winding transf. with single or double busbar but
with a single breaker arr. on both sides
1MRK 004 500-93
Configuration diagram B, Two winding transf. in multi breaker arr. on one or both
sides
1MRK 004 500-94
Configuration diagram C, Three winding transf. with single or double busbar but
with a single breaker arr. on both sides
1MRK 004 500-95
Configuration diagram D, Two winding transf. in multi breaker arr. on one or
both sides
1MRK 004 500-96
Setting example 1, 400/230 kV 500 MVA Transformer, YNyn connected 1MRK 504 083-WEN
Setting example 2, 132/230 kV 40 MVA Transformer, YNd1 connected 1MRK 504 084-WEN
Connection and Installation components 1MRK 013 003-BEN
Test system, COMBITEST 1MRK 512 001-BEN
Accessories for IED 670 1MRK 514 012-BEN
Getting started guide IED 670 1MRK 500 065-UEN
SPA and LON signal list for IED 670 1MRK 500 075-WEN
IEC 61850 Data objects list for IED 670 1MRK 500 077-WEN
Generic IEC 61850 IED Connectivity package 1KHA001027–UEN
Protection and Control IED Manager PCM 600 Installation sheet 1MRS755552
Engineering guide IED 670 products 1MRK 511 179–UEN
Latest versions of the described documentation can be found on www.abb.com/substationautomation
Section 1
Introduction
RET 670 Operator's manual
1MRK504049-UEN rev. D
11
1.1.5 Revision notes
Revision Description
D No functionality added. Minor changes made in content due to problem reports.
Section 1
Introduction
12 Operator's manual
1MRK504049-UEN rev. D
RET 670
Section 2 Safety information
About this chapter
This chapter lists warnings and cautions that must be followed when handling the
IED.
2.1 Warnings
Do not touch circuitry during operation. Potentially lethal voltages
and currents are present.
Always connect the IED to protective earth, regardless of the
operating conditions. This also applies to special occasions such as
bench testing, demonstrations and off-site configuration. Operating
the IED without proper earthing may damage both IED and measuring
circuitry and may cause injuries in the event of an accident.
Never remove any screw from a powered IED or from a IED
connected to powered circuitry. Potentially lethal voltages and
currents are present.
Always avoid touching the circuitry when the cover is removed. The
product contains electronic circuitries which can be damaged if
exposed to static electricity (ESD). The electronic circuitries also
contain high voltage which is lethal to humans.
Section 2
Safety information
RET 670 Operator's manual
1MRK504049-UEN rev. D
13
14
Section 3 Overview
About this chapter
This chapter presents a general overview of the Operator's manual.
3.1 Operator overview
The Human machine interface (HMI) on the IED provides an ideal mechanism for
the day to day operation and even advanced use of the IED. The keypad, LCD and
LEDs on the front of the IED are what constitute the HMI. Troubleshooting, apparatus
control, monitoring, setting and configuring are all possible via this interface.
Through the screens and menu elements available, as well as the keypad, the user is
able to navigate throughout the menu structure and move from screen to screen. This
document is, to a great extent, arranged in the same way as the IED software is
structured and describes all aspects of operation via the HMI.
The operator can document disturbances so that their causes can be analyzed and
evaluated for future reference. For example, the fault currents and voltages at the time
of the fault can be documented. The operator can also retrieve data about protected
objects, providing further information for fault analysis. This implies viewing the
mean value of current, voltage, power and frequency or primary and secondary
measured phasors. The operator can check the IED status at any time.
In some cases the operator may need to change the way the IED operates. This might
include changing the active setting group or a parameter value. This must always be
done strictly according to applicable regulations because un-authorized changes may
lead to severe damage of the protected object especially if a fault is not properly
disconnected.
3.2 Identify the IED
To identify the IED, open the diagnostics menu. The identity of the IED along with
other data is found under:
Diagnostics/IED status/Product Identifiers
The type of IED, the main function type, its serial number, ordering number and
production date are found here.
Section 3
Overview
RET 670 Operator's manual
1MRK504049-UEN rev. D
15
16
  • Page 1 1
  • Page 2 2
  • Page 3 3
  • Page 4 4
  • Page 5 5
  • Page 6 6
  • Page 7 7
  • Page 8 8
  • Page 9 9
  • Page 10 10
  • Page 11 11
  • Page 12 12
  • Page 13 13
  • Page 14 14
  • Page 15 15
  • Page 16 16
  • Page 17 17
  • Page 18 18
  • Page 19 19
  • Page 20 20
  • Page 21 21
  • Page 22 22
  • Page 23 23
  • Page 24 24
  • Page 25 25
  • Page 26 26
  • Page 27 27
  • Page 28 28
  • Page 29 29
  • Page 30 30
  • Page 31 31
  • Page 32 32
  • Page 33 33
  • Page 34 34
  • Page 35 35
  • Page 36 36
  • Page 37 37
  • Page 38 38
  • Page 39 39
  • Page 40 40
  • Page 41 41
  • Page 42 42
  • Page 43 43
  • Page 44 44
  • Page 45 45
  • Page 46 46
  • Page 47 47
  • Page 48 48
  • Page 49 49
  • Page 50 50
  • Page 51 51
  • Page 52 52
  • Page 53 53
  • Page 54 54
  • Page 55 55
  • Page 56 56
  • Page 57 57
  • Page 58 58
  • Page 59 59
  • Page 60 60
  • Page 61 61
  • Page 62 62
  • Page 63 63
  • Page 64 64
  • Page 65 65
  • Page 66 66
  • Page 67 67
  • Page 68 68
  • Page 69 69
  • Page 70 70
  • Page 71 71
  • Page 72 72
  • Page 73 73
  • Page 74 74
  • Page 75 75
  • Page 76 76
  • Page 77 77
  • Page 78 78
  • Page 79 79
  • Page 80 80
  • Page 81 81
  • Page 82 82
  • Page 83 83
  • Page 84 84
  • Page 85 85
  • Page 86 86
  • Page 87 87
  • Page 88 88
  • Page 89 89
  • Page 90 90
  • Page 91 91
  • Page 92 92
  • Page 93 93
  • Page 94 94
  • Page 95 95
  • Page 96 96

ABB RET 670 User manual

Type
User manual

Ask a question and I''ll find the answer in the document

Finding information in a document is now easier with AI