Rockwell-automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE Manual de usuario Pagina 168
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10-6
Reference
Torque and Horsepower (cont.)
By manipulating the preceding equation for kVA/HP for three-phas
motors, the following equation can be used for calculating locked-
rotor current:
This equation can then be used to determine the approximate starting
current of any particular motor. For instance, the approximate
starting current for 7-1/2 HP, 230 volt motor with a locked-rotor kVA
code letter of G would be:
Operating a motor in a locked-rotor condition for an extended period
of time will result in insulation failure because of the excessive heat
generated in the stator. The following graph illustrates the maximum
time a motor may be operated at locked-rotor without incurring
damage caused by heating. This graph assumes a NEMA Design B
motor with Class B temperature rise.
Figure 10.4 Motor Safe Time vs. Line Current - Standard Induction Motors
➊
Base Amps and Nameplate Amps.
Motor protection, either inherent or in the motor control, should be
selected to limit the stall time of the motor.
LRA
1,00 0H
×
kVA/HP
×
1.73 Volts
×
--------------------------------------------=
LRA
1,00 07.
×
6.0
×
1.73 230
×
-------------------------------------
113 Amp
==
From Operating
Temperature
From Ambient
Motor
Line
Amps
Per
Unit
➀
8
6
4
2
1
0
10 15 20 100 200 700
Motor Running
Motor Stalled
Time in Seconds
- Application 1
- Please Read! 2
- Important User 2
- Information 2
- Table of Contents 3
- SMC Controllers 8
- Chapter 1 9
- Modes of Operation 10
- Adjustments 11
- Features 11
- Wiring Diagrams 12
- Suitable Replacement 14
- Applications 14
- Applications (cont.) 15
- SMC-2 Smart Motor Controller 20
- Modes of Operation (cont.) 21
- Current Limit Level 24
- Time Select 24
- Adjustments (cont.) 25
- Wiring Diagram 26
- Soft Stop Option 27
- Options (cont.) 29
- Chapter 3 38
- Starting Methods 39
- Current Limit Start 40
- Dual Ramp Start 40
- Starting Methods (cont.) 41
- Electronic Overload 42
- Built-in Communication Port 42
- Features (cont.) 43
- Phase Rebalance 44
- Metering 44
- Fault Indication 44
- Control Terminal Description 46
- Typical Wiring Diagrams 52
- (without options) 52
- (without options) (cont.) 55
- Control Options 56
- Control Options (cont.) 57
- Pump Control Option 60
- Stopping follows: 62
- Preset Slow Speed Option 64
- Speed Option follows: 66
- Customer supplied 70
- Smart Motor 72
- Accu-Stop Option 74
- Capability 80
- Plus Controller 83
- Tow Chain 93
- Exhaust Intake 95
- 1-1/2 HP 96
- 480 Volts 102
- Centrifuge 102
- Gearbox Motor 102
- Gearbox 103
- 575 Volts 104
- 240 Volts 109
- Bundle Bundle 113
- Windshields 114
- 230 Volts 116
- Motor Motor 116
- Die Die 116
- ~~~~~~~~~~~~~~~~~ 122
- Application Considerations 125
- Use of Protective Modules 126
- Current Limit Fuses 127
- Motor Overload Protection 128
- Stall Protection and 129
- Jam Detection 129
- Built-in SCANport 129
- Communications 129
- Power Factor Capacitors 130
- Multi-motor Applications 132
- Part Winding 133
- Wound Rotor 133
- Synchronous 133
- Altitude De-rating 134
- Isolation Contactor 134
- SMC Dialog Plus Controller 135
- Winding Heater 137
- Motor Torque Capabilities 138
- Controller Options 138
- Accu-Stop 139
- Energy Saver Operation 139
- Energy Saver (cont.) 140
- Application Requirements 141
- Preliminary Estimates 141
- Chapter 6 143
- Mining and Metals 144
- Food Processing 145
- Pulp and Paper 146
- Petrochemical 147
- OEM Specialty Machine 149
- Lumber and Wood Products 150
- Water/Wastewater 151
- Treatment and Municipalities 151
- Design Philosophy 152
- Reduced Voltage Starting 154
- Reduced Voltage 155
- Design B Motors 156
- Reduced Voltage (cont.) 157
- Solid-state 159
- Chapter 9 161
- Solid-state Starters 162
- Using SCRs (cont.) 162
- Reference 163
- Torque and Horsepower (cont.) 164
- Locked-Rotor Torque (LRT) 165
- Pull-Up Torque (PUT) 165
- Breakdown Torque (BT) 165
- Motor Output for 169
- NEMA Design Designations 169
- Polyphase 1–500 HP 169
- Polyphase 1–500 HP (cont.) 170
- Calculating Torque 173
- (Acceleration Torque 173
- Required for Rotating Motion) 173
- ---------------------------= 174
- -----------= 174
- Torque Formulas 175
- AC Motor Formulas 176
- Torque Characteristics on 177
- Common Applications 177
- Common Applications (cont.) 178
- Electrical Formulas 179
- Calculating Motor Amperes 180
- Other Formulas 181
- Engineering Constants 181
- Engineering Constants (cont.) 182
- Conversion Factors 185
- Conversion Factors (cont.) 186
- ---------------------= 187
- Glossary 188
- Glossary-2 189
- Glossary-3 190
- Glossary-4 191
- Glossary-5 192
- Glossary-6 193
- Glossary-7 194
- Glossary-8 195
- Glossary-9 196
- Glossary-10 197
- Glossary-11 198
- Glossary-12 199
- Glossary-13 200
- Glossary-14 201
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