Siemens SINAMICS G120 Operations Instructions Page 195
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- Table of contents
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Functions
7.9 Application-specific functions
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB
193
7.9.2.3 Compound braking
Compound braking is typically used for applications in which the motor is normally operated
at a constant speed and is only braked down to standstill in longer time intervals, e.g.:
● Centrifuges
● Saws
● Grinding machines
● Horizontal conveyors
Principle of operation
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Figure 7-12 Motor brakes with and without active compound braking
Compound braking prevents the DC link voltage increasing above a critical value. The
inverter activates compound braking depending on the DC link voltage. Above a DC link
voltage threshold (r1282), the inverters adds a DC current to the motor current. The DC
current brakes the motor and prevents an excessive increase in the DC link voltage.
Note
Compound braking is only active in conjunction with the V/f control.
Compound braking does not operate in the following cases:
• The "flying restart" function is active
• DC braking is active
• Vector control is selected
- SINAMICS 1
- A5E02299792B AB 3
- Change history 5
- Table of contents 10
- Table of contents 11
- Introduction 13
- 1.3.1 General basics 15
- 1.3.2 Parameter 15
- Introduction 17
- Binectors and connectors 18
- BICO parameters 19
- +DQGKHOG 24
- ,23 %23 24
- Description 25
- 2.3 Power Module 26
- 2.4 Reactors and filters 27
- 2.4 Reactors and filters 28
- Installing 29
- Line supply 31
- Line filter 31
- Installing 33
- Preconditions 37
- Connecting the inverter 39
- Control cabinet design 40
- Cable routing and shielding 40
- 3.4 Installing Control Unit 44
- 3.4 Installing Control Unit 46
- Motorized potentiometer 49
- Two- or three-wire control 49
- Fixed speeds 51
- Two safety functions 52
- Process industry 54
- Commissioning 59
- 4.2.1 Collecting motor data 61
- 4.4.1 Display of the BOP-2 68
- 4.4.2 Menu structure 69
- ② Basic commissioning 69
- 4.4.5 Additional settings 72
- Commissioning steps 73
- Going online 75
- ① In the next step, set the 77
- ④ Switch on the motor 78
- Go offline 79
- Recording 80
- Trigger 81
- Display options 82
- External data backup 83
- Series commissioning 83
- Automatic upload 85
- Manual upload 85
- Automatic download 86
- Manual download 86
- 5.1 Digital inputs 92
- 5.2 Fail-safe digital input 94
- 5.3 Digital outputs 95
- 5.4 Analog inputs 96
- Adapt terminal strip 97
- 5.4 Analog inputs 97
- 5.5 Analog outputs 99
- Adapt terminal strip 100
- 5.5 Analog outputs 100
- $2 101
- Configuring the fieldbus 103
- 6.1.2 Setting the address 105
- 6.1.4 Cyclic communication 107
- Select telegram 108
- Control word 1 (STW1) 109
- Status word 1 (ZSW1) 110
- Control word 3 (STW3) 111
- Status word 3 (ZSW3) 112
- Parameter channel 113
- Configuring the fieldbus 115
- Parameter index (IND) 116
- Parameter value (PWE) 116
- 6.1.5 Acyclic communication 119
- Changing parameter values 121
- Diagnostics 122
- 6.2 Communication via RS485 124
- 6.2.2 Communication via USS 125
- 6.2 Communication via RS485 126
- Description 127
- Start delay 127
- channel (IND) 129
- 6.2.2.6 USS read request 134
- 6.2.2.7 USS write job 135
- Communication settings 139
- 6.2.3.1 Setting the address 140
- 6.2.3.3 Modbus RTU telegram 141
- Function codes used 145
- Communication errors 147
- Logical error 148
- ,QWHUIDFHV 149
- Functions 150
- 7.2 Inverter control 151
- Functions 153
- 7.2 Inverter control 153
- 7.2 Inverter control 154
- &RPPDQGGDWDVHW 158
- &RPPDQGGDWDVHW 158
- Advanced settings 159
- 7.3 Command sources 160
- 7.4 Setpoint sources 161
- 7.4 Setpoint sources 162
- 7.4 Setpoint sources 163
- Procedure 164
- Setting jogging 166
- 7.5 Setpoint calculation 168
- 7.5 Setpoint calculation 169
- 7.6 Motor control 170
- 7.6.1 V/f control 171
- 7.6 Motor control 172
- 7.6 Motor control 173
- 7.6.2 Vector control 175
- 7.6.2.3 Torque control 176
- 7.7 Protection functions 177
- 7.7 Protection functions 178
- 7.7 Protection functions 179
- Method of operation of I 180
- controller 180
- 7.8 Status messages 183
- 7.9.1 Unit changeover 184
- (VWDEOLVKWKHRQOLQH 187
- FRQQHFWLRQ 187
- *RRIIOLQH 187
- GLVFRQQHFW 187
- Regenerative power 189
- ,QYHUWHU 190
- %UDNLQJUHVLVWRU 190
- %UDNLQJ 190
- 7.9.2.2 DC braking 192
- Principle of operation 192
- DC braking parameters 194
- 7.9.2.3 Compound braking 195
- 7.9.2.4 Dynamic braking 197
- DC link, max 197
- Braking resistor connection 197
- *URXQG(DUWK 200
- )O\LQJOHDGWR 200
- 3RZHU0RGXOH 200
- &RQQHFWLRQWREUDNHFRLO 200
- LQVLGHWKHPRWRU 200
- Commissioning 204
- 7.9.3.2 Automatic switch-on 208
- WRVLJQDOHYDOXDWLRQ 215
- ',[ 215
- Speed deviation monitoring 216
- Activating the free blocks 218
- Analog signal scaling 219
- Example: AND operation 221
- 7.10.2 Permitted sensors 222
- 266' 223
- 266' 223
- Discrepancy 225
- 7.10.6 Password 228
- 7.10.7.1 Commissioning tool 229
- 7.10.7.4 Setting STO 231
- 7.10.7.5 Activate settings 231
- 7.10.8.4 Documentation 236
- Machine overview 236
- Converter data 236
- Function table 237
- 7.10.8.5 Function test 238
- Data backup 240
- Countersignatures 240
- )LUPZDUH9HUVLRQ 243
- Service and maintenance 244
- Acceptance test 245
- Signal states of the LED 248
- 9.2 Alarms 250
- Extended settings for alarms 252
- 9.3 Faults 253
- Fault acknowledgement 254
- 9.3 Faults 255
- 9.3 Faults 256
- Extended settings for faults 257
- Axxxxx Alarm 258
- Fyyyyy: Fault 258
- Technical data 265
- Technical data 267
- Definitions 269
- General data, PM240 - IP20 270
- General data, PM250 - IP20 276
- General data, PM260 - IP20 279
- Appendix 281
- Appendix 283
- A.1 Application Examples 283
- A.1 Application Examples 284
- Final steps 285
- Settings in the control 292
- Index 299
- 114, 130 300
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