GE GEK-106273L User manual

GE Multilin
215 Anderson Avenue
L6E 1B3 Markham, ON -CANADA
Tel: [phone] Fax: [phone]
E-mail: [email protected]
Internet: www.GEMultilin.com
Copyright © 2005 GE Multilin
MIF
Digital Feeder Protection
Instruction manual
GEK-106273L
GE Multilin
Avda. Pinoa, 10
48170 Zamudio SPAIN
Tel: [phone] Fax: [phone]
E-mail: [email protected]
gGE Consumer & Industrial
Multilin

TABLE OF CONTENTS
GEK-106273L MIF Digital Feeder Protection i
1. GETTING STARTED 1-1
1.1 INSPECTION CHECKLIST 1-1
1.2 ENERVISTA MII SETUP SOFTWARE 1-3
1.2.1. SYSTEM REQUIREMENTS.....................................................................................................1-3
1.2.2. INSTALLATION........................................................................................................................1-3
1.3 M-RELAY FAMILY HARDWARE 1-10
1.3.1. MOUNTING & WIRING..........................................................................................................1-10
1.3.2. COMMUNICATIONS..............................................................................................................1-10
1.3.3. FACEPLATE KEYPAD & DISPLAY.......................................................................................1-10
1.4 USING THE KEYPAD AND DISPLAY 1-11
1.4.1. HIERARCHICAL MENUS.......................................................................................................1-11
2. PRODUCT DESCRIPTION 2-1
2.1 INTRODUCTION 2-1
2.1.1. GENERAL OVERVIEW............................................................................................................2-1
2.2 OVERCURRENT UNITS 2-3
2.2.1. PHASE TIME OVERCURRENT UNIT (51P) ...........................................................................2-3
2.2.2. PHASE INSTANTANEOUS OVERCURRENT UNITS (50PH, 50PL)......................................2-7
2.2.3. GROUND TIME OVERCURRENT UNIT (51N) .......................................................................2-7
2.2.4. GROUND INSTANTANEOUS OVERCURRENT UNITS (50NH, 50NL)..................................2-7
2.3 THERMAL IMAGE UNIT 2-8
2.4 COLD LOAD PICKUP (ONLY OPTION 2 MODELS) 2-8
2.5 BREAKER FAILURE TO OPEN (ONLY OPTION 2 MODELS) 2-9
2.6 I2COUNTER (ONLY OPTION 2 MODELS) 2-9
2.7 EVENTS (AVAILABLE IN OPTION 1 AND OPTION 2 MODELS) 2-10
2.8 OSCILLOGRAPHY (AVAILABLE IN OPTION 1 AND OPTION 2 MODELS) 2-11
2.9 MULTIPLE SETTINGS GROUPS 2-12
2.10 MEASUREMENT AND SELF-TEST 2-12
2.11 USER INTERFACE 2-13
2.12 MODEL LIST. ORDER CODES 2-15
2.13 TECHNICAL SPECIFICATIONS. 2-17
2.13.1. PROTECTION UNITS............................................................................................................2-17
2.13.2. METERING FUNCTIONS ......................................................................................................2-18
2.13.3. INPUTS ..................................................................................................................................2-18
2.13.4. POWER SUPPLY...................................................................................................................2-19
2.13.5. OUTPUTS ..............................................................................................................................2-19
2.13.6. COMMUNICATIONS..............................................................................................................2-20
2.13.7. ENVIRONMENTAL ................................................................................................................2-20
2.13.8. TYPE TESTS & CERTIFICATIONS.......................................................................................2-21
2.13.9. PRODUCTION TESTS...........................................................................................................2-21
2.13.10. APPROVALS..........................................................................................................................2-22

TABLE OF CONTENTS
ii MIF Digital Feeder Protection GEK-106273L
3. HARDWARE 3-23
3.1 DESCRIPTION 3-23
3.1.1. RELAY IDENTIFICATION......................................................................................................3-23
3.1.2. PANEL CUTOUT...................................................................................................................3-23
3.1.3. MODULE WITHDRAWAL / INSERTION...............................................................................3-25
3.1.4. WIRING AND INTERNAL CONNECTIONS ..........................................................................3-25
3.1.5. REAR TERMINAL ASSIGNMENTS ......................................................................................3-26
3.2 WIRING 3-27
3.2.1. TYPICAL WIRING DIAGRAM................................................................................................3-27
3.2.2. CONTROL POWER...............................................................................................................3-28
3.2.3. AC CURRENT TRANSFORMER INPUTS............................................................................3-29
3.2.4. CONTACT INPUTS / OUTPUTS...........................................................................................3-30
3.2.5. OUTPUT CONTACTS CONFIGURATION............................................................................3-31
3.2.6. OUTPUTS ISOLATION..........................................................................................................3-32
3.2.7. RS232 FACEPLATE COMMUNICATIONS PORT................................................................3-36
3.2.8. RS485 COMMUNICATIONS PORT......................................................................................3-38
4. COMMUNICATIONS 4-1
4.1 ENERVISTA MII SETUP SOFTWARE 4-1
4.1.1. OVERVIEW..............................................................................................................................4-1
4.1.2. STARTING COMMUNICATION...............................................................................................4-2
4.1.3. MAIN SCREEN........................................................................................................................4-2
4.2 FILE 4-3
4.3 SETPOINT 4-6
4.3.1. SETTINGS...............................................................................................................................4-6
4.3.2. MAIN SETTINGS.....................................................................................................................4-8
4.3.3. ADVANCED SETTINGS..........................................................................................................4-8
4.3.4. RELAY CONFIGURATION......................................................................................................4-9
4.3.5. LOGIC CONFIGURATION.....................................................................................................4-11
4.3.6. CLOCK...................................................................................................................................4-12
4.4 ACTUAL 4-13
4.4.1. ACTUAL VALUES..................................................................................................................4-13
4.4.2. EVENT RECORDER .............................................................................................................4-14
4.4.3. WAVEFORM CAPTURE........................................................................................................4-15
4.5 OPERATIONS 4-15
4.6 COMMUNICATION 4-16
4.6.1. COMPUTER ..........................................................................................................................4-16
4.6.2. TROUBLESHOOTING...........................................................................................................4-20
4.6.3. UPGRADE FIRMWARE VERSION.......................................................................................4-21
4.7 VIEW 4-24
4.7.1. TRACES.................................................................................................................................4-24
4.7.2. MODBUS MEMORY MAP.....................................................................................................4-25
4.7.3. LANGUAGES.........................................................................................................................4-26

TABLE OF CONTENTS
GEK-106273L MIF Digital Feeder Protection iii
5. SETTINGS 5-27
5.1 SETTINGS STRUCTURE 5-27
5.2 MAIN SETTINGS 5-28
5.2.1. GENERAL SETTINGS...........................................................................................................5-28
5.2.2. PHASE / GROUND TOC SETTINGS (51P / 51N).................................................................5-29
5.2.3. PHASE / GROUND IOC SETTINGS (50PH / 50PL / 50NH / 50NL)......................................5-30
5.2.4. THERMAL IMAGE SETTINGS (49).......................................................................................5-31
5.3 ADVANCED SETTINGS 5-31
5.3.1. GENERAL SETTINGS...........................................................................................................5-31
5.3.2. PHASE / GROUND TOC SETTINGS (51P / 51N) (TABLE 2)...............................................5-32
5.3.3. PHASE / GROUND IOC SETTINGS (50PH / 50PL / 50NH / 50NL) (TABLE 2)....................5-33
5.3.4. THERMAL IMAGE SETTINGS (49) (TABLE 2).....................................................................5-34
5.3.5. USER’S CURVE.....................................................................................................................5-34
5.3.6. EVENTS AND OSCILLOGRAPHY MASKS...........................................................................5-35
5.3.7. OSCILLOGRAPHY MASKS...................................................................................................5-36
5.3.8. I2 COUNTER..........................................................................................................................5-36
5.3.9. BREAKER FAILURE TO OPEN.............................................................................................5-37
5.3.10. COLD LOAD PICKUP............................................................................................................5-37
5.4 TIME SYNCHRONIZATION 5-37
6. I/0 CONFIGURATION 6-39
6.1 INPUT CONFIGURATION (ONLY FOR OPTION 1 AND OPTION 2 MODELS) 6-39
6.1.1. DESCRIPTION OF INPUTS...................................................................................................6-39
6.1.2. INPUT FUNCTIONS...............................................................................................................6-40
6.2 OUTPUTS AND LEDS CONFIGURATION (ONLY FOR OPTION 1 AND OPTION 2 MODELS) 6-41
6.2.1. DESCRIPTION OF OUTPUTS AND LEDS ...........................................................................6-41
6.2.2. OUTPUTS AND LEDS FUNCTIONS.....................................................................................6-42
7. LOGIC CONFIGURATION (ONLY OPTION 2 MODELS) 7-1
7.1.1. LOGIC DESCRIPTION.............................................................................................................7-1
7.1.2. LOGIC FUNCTIONS................................................................................................................7-4
8. KEYPAD AND DISPLAY 8-7
8.1 FACEPLATE KEYPAD 8-7
8.2 ALPHANUMERIC DISPLAY 8-7
8.3 MAIN STRUCTURE 8-8
8.4 INFORMATION MENU 8-10
8.5 MAIN SETTINGS MENU 8-11
8.6 ADVANCED SETTINGS MENU 8-19
8.7 OPERATIONS MENU 8-22
8.8 DATE AND TIME MENU 8-24
8.9 RESETTING THE THERMAL IMAGE UNIT 8-25
8.10 RESETTING THE TARGET LEDS 8-25

TABLE OF CONTENTS
iv MIF Digital Feeder Protection GEK-106273L
9. RELAY COMMISSIONING 9-1
9.1 VISUAL INSPECTION 9-1
9.2 COMMENTS ON THE TEST EQUIPMENT 9-1
9.3 INSULATION TESTS 9-1
9.4 WIRING AND NECESSARY EQUIPMENT 9-2
9.5 TARGET LEDS 9-3
9.6 POWER SUPPLY TEST 9-3
9.7 COMMUNICATIONS 9-3
9.8 RELAY SETTING 9-4
9.9 CONTACT INPUTS 9-4
9.10 CONTACT OUTPUTS 9-4
9.11 RELAY METERING 9-5
9.11.1. CURRENT METERING ...........................................................................................................9-5
9.12 PHASE IOC HIGH SETTING UNIT (50PH) 9-5
9.13 PHASE IOC LOW SETTING UNIT (50PL) 9-5
9.14 GROUND IOC HIGH SETTING UNIT (50NH) 9-6
9.15 GROUND IOC LOW SETTING UNIT (50NL) 9-6
9.16 PHASE TOC UNIT (51P) 9-6
9.16.1. IEC INVERSE CURVE.............................................................................................................9-6
9.16.2. IEC VERY INVERSE CURVE..................................................................................................9-7
9.16.3. IEC EXTREMELY INVERSE CURVE......................................................................................9-7
9.16.4. ANSI INVERSE CURVE..........................................................................................................9-7
9.16.5. ANSI VERY INVERSE CURVE ...............................................................................................9-7
9.16.6. ANSI EXTREMELY INVERSE CURVE...................................................................................9-8
9.17 DEFINITE TIME 9-9
9.18 GROUND TOC UNIT (51N) 9-9
9.18.1. IEC INVERSE CURVE.............................................................................................................9-9
9.18.2. IEC VERY INVERSE CURVE..................................................................................................9-9
9.18.3. IEC EXTREMELY INVERSE CURVE....................................................................................9-10
9.18.4. ANSI INVERSE CURVE........................................................................................................9-10
9.18.5. ANSI VERY INVERSE CURVE .............................................................................................9-10
9.18.6. ANSI EXTREMELY INVERSE CURVE.................................................................................9-10
9.18.7. DEFINITE TIME.....................................................................................................................9-11
9.19 THERMAL IMAGE UNIT (49) 9-12
9.20 TIME SYNCHRONIZATION 9-12
9.21 USER SETTINGS 9-13
9.21.1. MAIN SETTINGS...................................................................................................................9-13
9.21.2. ADVANCED SETTINGS........................................................................................................9-15

TABLE OF CONTENTS
GEK-106273L MIF Digital Feeder Protection v
10. INSTALLATION AND MAINTENANCE 10-1
10.1 INSTALLATION 10-1
10.2 GROUND CONNECTION AND DISTURBANCES SUPPRESSION 10-1
10.3 MAINTENANCE 10-1
10.4 CLEANING INSTRUCTIONS 10-1
11. ANNEX 1 THERMAL IMAGE UNIT 11-1
11.1 INTRODUCTION 11-1
11.2 OPERATING PRINCIPLE 11-1
11.3 ALGORITHMS 11-2
11.4 THERMAL CURVE 11-4
11.5 MIF THERMAL CURVES 11-5
12. ANNEX 2 TIME-CURRENT CURVES FOR 51P AND 51N UNITS 12-1
13. ANNEX 3. MODBUS®MEMORY MAP 13-1
13.1 READING VALUES 13-1
13.2 COMMAND EXECUTION 13-2
13.3 SYNCHRONIZATION 13-4
13.4 WRITING SETTINGS 13-5
13.5 ERRORS 13-7
13.6 MODBUS®MEMORY MAP®13-8
13.6.1. STATES..................................................................................................................................13-8
13.6.2. SETTINGS............................................................................................................................13-10
13.6.3. SPECIAL FORMATS............................................................................................................13-12
14. ANNEX 4. MODEM CONNECTION 14-1
14.1 HAYES MODEM 14-1
14.2 V.25BIS MODEM 14-2
14.3 SAMPLES OF SETTINGS FOR PARTICULAR MODEMS 14-3
14.3.1. SPORTSTER FLASH X2 MODEM (HAYES).........................................................................14-3
14.3.2. ZOOM PKT14.4......................................................................................................................14-4
14.3.3. MODEM SATELSA MGD-2400-DHE (V.25BIS)....................................................................14-5
15. ANNEX 5. HARMONIC FILTERING 15-1
15.1 GENERAL PRINCIPLE OF OPERATION. 15-1
15.2 DIGITAL FILTER 15-2

TABLE OF CONTENTS
vi MIF Digital Feeder Protection GEK-106273L
16. ANNEX 6. STATUS LIST 16-1
17. APPLICATION NOTES 17-1
17.1 MIF WITH 1-SHOT RECLOSER 17-1
17.1.1. I/O CONFIGURATION...........................................................................................................17-2
17.1.2. LOGIC CONFIGURATION.....................................................................................................17-2
17.2 TRIP CIRCUIT SUPERVISION FOR M-FAMILY RELAYS 17-4
17.2.1. SETTINGS AND CONFIGURATION.....................................................................................17-5

GETTING STARTED
GEK-106273L MIF Digital Feeder Protection 1-1
1.GETTING STARTED
To help ensure years of trouble free operation, please read through the following chapter for information to help guide
you through the initial installation procedures of your new relay.
CAUTION: THE OPERATOR OF THIS INSTRUMENT IS ADVISED THAT IF THE EQUIPMENT IS USED IN A
MANNER NOT SPECIFIED IN THIS MANUAL, THE PROTECTION PROVIDED BY THE EQUIPMENT MAY BE
IMPAIRED
INSTALLATION MUST BE ACCORDING TO THE NATIONAL ELECTRIC
CODE OF THE APPROPRIATE COUNTRY
1.1 INSPECTION CHECKLIST
• Open the relay packaging and inspect the relay for physical damage.
• View the faceplate relay model number and verify that the relay is the correct model ordered.
• Ensure that the mounting screws have been included with the relay.
• For product information, instruction manual updates, and the latest software updates, please visit the GE Power
Management Home Page (www.geindustrial.com/pm).
Note: If there is any physical damage noticed on the relay, or any of the contents listed are missing, please
contact GE Power Management immediately.
GE Power Management contact information:
GENERAL ELECTRIC POWER MANAGEMENT S.A
Avda. Pinoa, 10
48170 Zamudio, Vizcaya (Spain)
Phone: [phone], Fax: [phone]
E-mail: [email protected]
GENERAL ELECTRIC MULTILIN
215, Anderson Avenue
L6E 1B3 Markham, ON (CANADA)
Phone: [phone], Fax: [phone]
E-mail: [email protected]

GETTING STARTED
1-2 MIF Digital Feeder Protection GEK-106273L
The information provided herein does not intend to cover all details of variations of the described equipment
nor does it take into account the circumstances that may be present in your installation, operating or
maintenance activities.
Should you wish to receive additional information, or for any particular problem that cannot be solved by
referring to the information contained herein, please contact GENERAL ELECTRIC POWER MANAGEMENT.

GETTING STARTED
GEK-106273L MIF Digital Feeder Protection 1-3
1.2 ENERVISTA MII SETUP SOFTWARE 1.2.1. SYSTEM REQUIREMENTS
The ENERVISTA MII SETUP software interface is the preferred method to edit settings and view actual values
because the PC monitor can display more information in a simple comprehensible format.
The following minimum requirements must be met for the ENERVISTA MII SETUP software to properly operate on a
PC:
 Pentium® class or higher processor (Pentium® II 300 MHz or higher recommended)
 Windows® NT 4.0 (Service Pack 3 or higher), Windows® 2000, Windows® XP
 Internet Explorer® 5.0 or higher
 64 MB of RAM (128 MB recommended)
 40 MB of available space on system drive and 40 MB of available space on installation drive
 RS232C serial and Ethernet port for communications to the relay
1.2.2. INSTALLATION
After ensuring the minimum requirements for using EnerVista MII Setup are met (see previous section), use the
following procedure to install the EnerVista MII Setup from the enclosed GE EnerVista CD.
1. Insert the GE EnerVista CD into your CD-ROM drive.
2. Click the Install Now button and follow the installation instructions to install the no-charge EnerVista software.
3. When installation is complete, start the EnerVista Launchpad application.
4. Click the IED Setup section of the Launch Pad window.
FIGURE 1-1
5. In the EnerVista Launch Pad window, click the Add Product button and select the “MIFII Digital Feeder Relay”
from the Install Software window as shown below. Select the “Web” option to ensure the most recent software

GETTING STARTED
1-4 MIF Digital Feeder Protection GEK-106273L
release, or select “CD” if you do not have a web connection, then click the Add Now button to list software items
for the MIFII.
FIGURE 1-2
6. If “Web” option is selected, chose the MIFII software program from the list and click the Download Now button to
obtain the installation program.
7. When EnerVista detects that there is already a version of the program in the Software Library, the user will choose
whether to install it directly or to check for more versions.

GETTING STARTED
GEK-106273L MIF Digital Feeder Protection 1-5
FIGURE 1-3
8. If we click the “Check for Updated Versions” button, the program will proceed to search for the different versions
of set-up program from the Web.
FIGURE 1-4
9. EnerVista Launchpad will obtain the installation program from the Web. If the version the user already has is the
last one on the Web, the following screen will appear

GETTING STARTED
1-6 MIF Digital Feeder Protection GEK-106273L
FIGURE 1-5
10. If there were more versions on the Web, EnerVista will then show the user the different setup programs available
for upgrade, with their version, size and release date.
11. Double-click the installation program once its download is complete, to install the ENERVISTA MII SETUP
software.
12. Select the complete path, including the new directory name, where the ENERVISTA MII SETUP will be installed.
13. Click on Next to begin the installation. The files will be installed in the directory indicated and the installation
program will automatically create icons and add ENERVISTA MII SETUP to the Windows start menu.
14. Follow the on-screen instructions to install the ENERVISTA MII SETUP software. When the Welcome window
appears, click on Next to continue with the installation procedure

GETTING STARTED
GEK-106273L MIF Digital Feeder Protection 1-7
FIGURE 1-6
15. When the Choose Destination Location window appears, and if the software is not to be located in the default
directory, click Change… and type in the complete path name including the new directory name and click Next to
continue with the installation procedure.
FIGURE 1-7
16. The default program group where the application will be added to is shown in the Selected Program Folder
window. Click Next to begin the installation process, and all the necessary program files will be copied into the
chosen directory.

GETTING STARTED
1-8 MIF Digital Feeder Protection GEK-106273L
FIGURE 1-8
17. To finish with the installation process, select the desired language for startup
FIGURE 1-9

GETTING STARTED
GEK-106273L MIF Digital Feeder Protection 1-9
18. Click Finish to end the installation. The MII device will be added to the list of installed IEDs in the EnerVista
Launchpad window, as shown below.
FIGURE 1-10

GETTING STARTED
1-10 MIF Digital Feeder Protection GEK-106273L
1.3 M-RELAY FAMILY HARDWARE 1.3.1. MOUNTING & WIRING
Please refer to the HARDWARE chapter for detailed relay mounting and wiring instructions. Review all WARNINGS
and CAUTIONS.
1.3.2. COMMUNICATIONS
The ENERVISTA MII SETUP software can communicate to the relay via the faceplate RS232 port, or the rear panel
RS485. To communicate with the relay via the faceplate RS232 port, a standard “straight through” serial cable is
used. The DB9 male end is connected to the relay and the db9 or DB25 female end is connected to the PC COM1 or
COM2 port as described in the HARDWARE chapter.
To communicate with the relay rear RS485 port from a computer RS232 port, an RS232/RS485 converter box is
needed. We recommend to use the F485 converter, manufactured by GE. This converter box is connected to the
computer using a “straight through” serial cable. A shielded twisted pair (20, 22 or 24 AWG according to the American
standards; 0.25, 0.34 or 0.5 mm2according to the European standards) cable is used to connect the converter box to
the relay rear communications terminals. The converter box (-, +, GND) terminals are connected to the relay (SDA,
SDB, GND) terminals respectively. For long communications cables (longer than 1 km), the RS485 circuit must be
terminated in a RC network (i.e. 120 ohm, 1 nF) as described in the HARDWARE chapter.
1.3.3. FACEPLATE KEYPAD & DISPLAY
Display messages are organised into menus under the main headings: Information, Main Settings, Advanced
Settings, Operations and Date/Time. A 3-key keypad and a 3.5-character display (shown below) are used as
elementary local HMI.
Figure 1.1 MIF KEYPAD AND DISPLAY
Using this keypad it is possible to access all the different menus in the relay, to view settings and measurements, and
to change settings.
-+
Enter
Menu Esc
GE Power Management
e

GETTING STARTED
GEK-106273L MIF Digital Feeder Protection 1-11
1.4 USING THE KEYPAD AND DISPLAY 1.4.1. HIERARCHICAL MENUS
Figure 1.2. MOVING THROUGH THE HIERARCHICAL MENU
As shown in figure 1.2, there are 3 hierarchical levels to access the information in the relay. The first level is an
automatic scrolling menu that shows the current value for each phase (Ia, Ib, Ic) and the Thermal Image value (in
percentage).
Pushing simultaneously “-“ and “Enter” keys the second level is accessed (this is indicated by the “Menu” text
labelled over the “-“ and “Enter” keys). To access information within the same hierarchical level (horizontal
movement) push “+“ or “-”. To access the third level push the “Enter” key when the desired heading is shown in the
display.
To return back to the previous level (from the third to the second level, or from the second to the first one) push “+”
and “Enter” keys simultaneously. This is indicated by the “Esc” text labelled over the “+” and “Enter” keys.
Refer to Chapter 8 – Keypad and Display, for more information on the use of the local keypad and display to access
information and change settings.
Presentation
Main
Settings
Informatio
n
I
a
Value Ib
Advanced
Setting
Date Time
General General
Advanced
Rst. LedsMod.
-
Ente
r
Men
u
Date Time
+
TH
-
+
- -
+ +
-
+
-Operations
+
Ente
r
Es
c
+
Ente
r
Es
c
+
Ente
r
Es
c
+
Ente
r
Es
c
+
Ente
r
Es
c
+
Ente
r
Es
c
Ente
r
Ente
r
Ente
r
Ente
r
Ente
r

GETTING STARTED
1-12 MIF Digital Feeder Protection GEK-106273L

PRODUCT DESCRIPTION
GEK-106273L MIF Digital Feeder Protection 2-1
2.PRODUCT DESCRIPTION
2.1 INTRODUCTION 2.1.1. GENERAL OVERVIEW
The MIF relay is a microprocessor-based relay designed for the following applications:
1. Main Protection for Medium and Low voltage feeders.
2. Main Protection for Medium size Motors.
3. Main Protection for Medium and Low power Transformers (less than 10MVA).
4. Differential Protection for Motors, if a CT differential connection is available.
5. Backup Protection for power Transformers (for any power level).
6. Backup Protection for Generators.
7. Backup Protection for Transmission lines.
8. Backup Protection for substation bus bars.
9. Thermal Image Protection/Supervision for Cables, Power Transformers, Grounding Resistors and Generation
Units.
Negligible over-travel and a high drop out to pick up ratio (>97%), along with the possibility of adjust a time delay for
the instantaneous units, allow optimal co-ordination without compromising selectivity.
Both faceplate RS232 port and rear RS485 port may be used to connect a PC for programming settings, monitoring
actual values and for retrieving stored information (list of events, oscillography, etc.). All serial ports use the Modbus®
RTU protocol and may be connected to system computers with baud rates from 300, 600, 1200, 4800, 9600 and
19200 bps. The rear RS485 port can be converted into an RS232 port or into a fibre optic (plastic or glass) serial port
by using the GE DAC300 module. The ENERVISTA MII SETUP communication software is the Windows® based
program used to communicate with the relay.
The MIF uses flash memory technology, which allows field upgrading (through ENERVISTA MII SETUP software) as
new features are added. This upgrade can be performed only through the communications port on the front of the
unit.
The following single line diagram (figure 2.1) illustrates the relay functionality using ANSI (American National
Standards Institute) device numbers.