Multilin 469 Motor Management Relay ... - GE Digital Energy

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5.6 S5 Thermal Model 5.6.1 Motor Thermal Limits CHAPTER 5: SETTINGS One of the principle enemies of motor life is heat. When a motor is specified, the purchaser communicates to the manufacturer what the loading conditions and duty cycle will be, as well as, environment and other pertinent information about the driven load such as starting torque, etc. The manufacturer then provides a stock motor or builds a motor that should have a reasonable life under those conditions. Motor thermal limits are dictated by the design of both the stator and the rotor. Motors have three modes of operation: locked rotor or stall (when the rotor is not turning), acceleration (when the rotor is coming up to speed), and running (when the rotor turns at near synchronous speed). Heating occurs in the motor during each of these conditions in very distinct ways. Typically, during motor starting, locked rotor and acceleration conditions, the motor is rotor limited. That is to say that the rotor will approach its thermal limit before the stator. Under locked rotor conditions, voltage is induced in the rotor at line frequency, 50 or 60 Hz. This voltage causes a current to flow in the rotor, also at line frequency, and the heat generated (I 2 R) is a function of the effective rotor resistance. At 50 or 60 Hz, the reactance of the rotor cage causes the current to flow at the outer edges of the rotor bars. The effective resistance of the rotor is therefore at a maximum during a locked rotor condition as is rotor heating. When the motor is running at rated speed, the voltage induced in the rotor is at a low frequency (approximately 1 Hz) and therefore, the effective resistance of the rotor is reduced quite dramatically. During running overloads, the motor thermal limit is typically dictated by stator parameters. Some special motors might be all stator or all rotor limited. During acceleration, the dynamic nature of the motor slip dictates that rotor impedance is also dynamic, and a third overload thermal limit characteristic is necessary. The figure below illustrates typical thermal limit curves. The motor starting characteristic is shown for a high inertia load at 80% voltage. If the motor started quicker, the distinct characteristics of the thermal limit curves would not be required and the running overload curve would be joined with locked rotor safe stall times to produce a single overload curve. The motor manufacturer should provide a safe stall time or thermal limit curves for any motor they sell. To program the 469 for maximum protection, it is necessary to ask for these items when the motor is out for bid. These thermal limits are intended to be used as guidelines and their definition is not always precise. When operation of the motor exceeds the thermal limit, the motor insulation does not immediately melt. Rather, the rate of insulation degradation has reached a point that motor life will be significantly reduced if it is run any longer in that condition. 5–36 469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS TIME-SECONDS 400 300 200 100 80 60 40 20 10 8 6 4 2 HIGH INERTIA MOTOR RUNNING OVERLOAD E,F, AND G ARE THE SAFE STALL THERMAL LIMIT TIMES AT 100%, 90%, AND 80%VOLTAGE, REPECTIVELY A,B,AND C ARE THE ACCELERATION THERMAL LIMIT CURVES AT 100%, 90%, AND 80%VOLTAGE, REPECTIVELY 1 0 100 200 300 400 500 600 % CURRENT FIGURE 5–5: Typical Time-Current and Thermal Limit Curves (ANSI/IEEE C37.96) 469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–37 C G B F A E 806827A1.CDR
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Software Revision: 5.1x Manual P/N:
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TOC TABLE OF CONTENTS Table of Cont
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TOC TABLE OF CONTENTS LOADING NEW F
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TOC TABLE OF CONTENTS LAST TRIP DAT
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Digital Energy Multilin 1.1 Importa
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CHAPTER 1: GETTING STARTED 1.2 Usin
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CHAPTER 1: GETTING STARTED To enter
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CHAPTER 1: GETTING STARTED Press t
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CHAPTER 1: GETTING STARTED 1.3 Chan
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CHAPTER 1: GETTING STARTED 1.3.4 En
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CHAPTER 1: GETTING STARTED SETTING
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CHAPTER 1: GETTING STARTED 1.3.5 Ou
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CHAPTER 1: GETTING STARTED 1.4 Appl
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CHAPTER 1: GETTING STARTED To begin
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CHAPTER 1: GETTING STARTED FIGURE 1
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CHAPTER 1: GETTING STARTED • Powe
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CHAPTER 1: GETTING STARTED • RTDs
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CHAPTER 1: GETTING STARTED 469 Moto
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CHAPTER 1: GETTING STARTED • Star
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CHAPTER 1: GETTING STARTED For curr
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CHAPTER 1: GETTING STARTED 1.4.6 S5
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CHAPTER 1: GETTING STARTED 1.4.8 S7
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CHAPTER 1: GETTING STARTED if the m
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2.1 Overview Digital Energy Multili
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CHAPTER 2: INTRODUCTION 51 Overload
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CHAPTER 2: INTRODUCTION 2.1.3 Order
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CHAPTER 2: INTRODUCTION 2.2.2 Outpu
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CHAPTER 2: INTRODUCTION Timing accu
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CHAPTER 2: INTRODUCTION 2.2.4 Digit
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CHAPTER 2: INTRODUCTION Note 2.2.6
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CHAPTER 2: INTRODUCTION 2.2.10 Cert
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Digital Energy Multilin 3.1 Mechani
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CHAPTER 3: INSTALLATION 3.1.3 Insta
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CHAPTER 3: INSTALLATION 3.1.4 Unit
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CHAPTER 3: INSTALLATION 3.1.5 Ether
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CHAPTER 3: INSTALLATION 3.1.7 Termi
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CHAPTER 3: INSTALLATION 3.2 Electri
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CHAPTER 3: INSTALLATION 3.2.4 Curre
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CHAPTER 3: INSTALLATION FIGURE 3-15
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CHAPTER 3: INSTALLATION 3.2.5 Volta
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CHAPTER 3: INSTALLATION 3.2.7 Analo
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CHAPTER 3: INSTALLATION Hot Compens
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CHAPTER 3: INSTALLATION relays, bei
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CHAPTER 3: INSTALLATION 3.2.13 Diel
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CHAPTER 3: INSTALLATION 3.2.14 2-Sp
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Digital Energy Multilin 4.1 Facepla
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CHAPTER 4: INTERFACES 4.1.4 RS232 P
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CHAPTER 4: INTERFACES The MESSAGE
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CHAPTER 4: INTERFACES 4.1.7 Diagnos
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CHAPTER 4: INTERFACES 4.1.9 Flash M
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CHAPTER 4: INTERFACES 4.2.2 Hardwar
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CHAPTER 4: INTERFACES 4.2.3 Install
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CHAPTER 4: INTERFACES Click on Nex
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CHAPTER 4: INTERFACES Select “Se
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CHAPTER 4: INTERFACES 4.3.4 Connect
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CHAPTER 4: INTERFACES Note The fron
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CHAPTER 4: INTERFACES 4.4.3 File Su
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CHAPTER 4: INTERFACES Note The Open
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CHAPTER 4: INTERFACES Note For fut
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CHAPTER 4: INTERFACES Note Click F
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CHAPTER 4: INTERFACES Enter the ap
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CHAPTER 4: INTERFACES Click OK. Th
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CHAPTER 4: INTERFACES 4.5 Upgrading
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Page 143 and 144: 5.1 Overview Digital Energy Multili
Page 145 and 146: CHAPTER 5: SETTINGS SETTINGS [ MES
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CHAPTER 5: SETTINGS 5.12.3 Demand t
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CHAPTER 5: SETTINGS 5.12.4 Pulse Ou
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CHAPTER 5: SETTINGS 5.13 S12 Analog
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CHAPTER 5: SETTINGS 5.13.2 Analog I
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CHAPTER 5: SETTINGS Note 5.13.3 Ana
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CHAPTER 5: SETTINGS This feature co
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CHAPTER 5: SETTINGS 5.14.2 Pre-Faul
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CHAPTER 5: SETTINGS 5.14.4 Test Out
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CHAPTER 5: SETTINGS 5.15 S14 Two-Sp
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CHAPTER 5: SETTINGS MESSAGE MESSAGE
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CHAPTER 5: SETTINGS 5.15.2 Speed2 U
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CHAPTER 6: ACTUAL VALUES 6.1.2 Desc
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CHAPTER 6: ACTUAL VALUES 6.2.2 Moto
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CHAPTER 6: ACTUAL VALUES 6.2.4 Alar
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CHAPTER 6: ACTUAL VALUES 6.2.5 Star
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CHAPTER 6: ACTUAL VALUES 6.3 A2 Met
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CHAPTER 6: ACTUAL VALUES 6.3.3 Volt
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CHAPTER 6: ACTUAL VALUES 6.3.6 Dema
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CHAPTER 6: ACTUAL VALUES FIGURE 6-1
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CHAPTER 6: ACTUAL VALUES The ACTUAL
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CHAPTER 6: ACTUAL VALUES The EnerVi
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CHAPTER 6: ACTUAL VALUES When the r
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CHAPTER 6: ACTUAL VALUES Pressing t
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CHAPTER 6: ACTUAL VALUES 6.4 A3 Lea
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CHAPTER 6: ACTUAL VALUES 6.4.4 Anal
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CHAPTER 6: ACTUAL VALUES 6.5.2 Gene
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CHAPTER 6: ACTUAL VALUES 6.6 A5 Eve
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CHAPTER 6: ACTUAL VALUES Underpower
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CHAPTER 6: ACTUAL VALUES 6.8 Diagno
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CHAPTER 6: ACTUAL VALUES forgotten,
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CHAPTER 6: ACTUAL VALUES PASSCODE
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CHAPTER 7: TESTING 7.2 Hardware Fun
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CHAPTER 7: TESTING 7.2.4 GE Multili
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CHAPTER 7: TESTING APPLIED RESISTAN
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CHAPTER 7: TESTING ANALOG OUTPUT FO
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CHAPTER 7: TESTING 7.3 Additional F
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CHAPTER 7: TESTING Symmetrical comp
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Digital Energy Multilin 469 Motor M
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A: APPENDIX Once again, if the pola
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A: APPENDIX • Programming the STA
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A: APPENDIX HGF5C HGF8 808841A1 808
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A: APPENDIX 808712A1.CDR 469 MOTOR
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A: APPENDIX A.5 Change Notes A.5.1
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A: APPENDIX PAG E (A3) PAG E (A4) T
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CHAPTER I: Index Numerics 0 to 1mA
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CHAPTER I: B BAUD RATE setpoints ..
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CHAPTER I: pressure switch alarm ..
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CHAPTER I: analog current .........
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CHAPTER I: NAMEPLATE VOLTAGE.......
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CHAPTER I: POWER FACTOR setpoints .
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CHAPTER I: RTD BIAS curve .........
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CHAPTER I: see 5 START BLOCK RELAY
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CHAPTER I: U description...........
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Multilin 469 Motor Management Relay ... - GE Digital Energy

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