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CHAPTER 6: SETPOINTS PROTECTION ELEMENTS
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 6–39
NOTE
NOTE:
The ground fault protection pickup setpoints are entered in %FLA if the Ground CT setpoint
is selected as "Residual," or in units of primary amps if a 50:0.025 core balance CT is used
and the ground CT is selected as “CBCT 2000:1”.
Various situations (for example, contactor bounce) may cause transient ground currents
during motor starting that exceed the ground fault pickup levels for a very short period of
time. The delay can be fine-tuned to an application so it still responds very quickly, but
rides through normal operational disturbances. Normally, the ground fault time delays are
set as short as possible, that is, 0 ms. Time may have to be increased if nuisance tripping
occurs.
Special care must be taken when the ground input is wired to the phase CTs in a residual
connection. When a motor starts, the starting current (typically 6 × FLA for an induction
motor) has an asymmetrical or DC component. This momentary DC component will cause
each of the phase CTs to react differently, and cause a net current into the ground input of
the relay.
The following setpoints are available for the ground fault protection element.
[Path: Home > Setpoints > Protection > Electrical]
Ground Trip Level
Range: 10 to 100% FLA in steps of 1%, or OFF, when Ground CT type is set to "Residual"
Range: 0.5 to 15.0 A in steps of 0.1 A, when Ground CT type is set to "CBCT 2000:1"
Default: OFF
This setpoint specifies the ground fault trip pickup level. A value of “OFF” disables the
ground fault trip function.
Ground Trip Delay on Start
Range: 0.0 to 10.0 s in steps of 0.1 s
Default: 0.0 s
This setpoint specifies the time that the motor ground fault current must meet or exceed
pickup to generate a ground fault trip when the motor is in a starting condition.
Ground Trip Delay on Run
Range: 0.0 to 5.0 s in steps of 0.1 s
Default: 0.0 s
This setpoint specifies the time that the motor ground fault current must meet or exceed
pickup to generate a ground fault trip when the motor is in a running condition.
Ground Alarm Level
Range: 10 to 100% FLA in steps of 1%, or OFF, when Ground CT type is set to "Residual"
Range: 0.5 to 15.0 A in steps of 0.1 A, when Ground CT type is set to "CBCT 2000:1"
Default: OFF
The setpoint specifies the ground fault alarm pickup level. A value of “OFF” disables the
ground fault alarm function.
Ground Alarm Delay on Start
Range: 0 to 60 s in steps of 1 s
Default: 10 s
This setpoint specifies the time that the motor ground fault current must meet or exceed
pickup to generate a ground fault alarm.
Ground Alarm Delay on Run
Range: 0 to 60 s in steps of 1 s
Default: 10 s
This setpoint specifies the time that the motor ground fault current must meet or exceed
pickup to generate a ground fault alarm.
- Instruction manual 1
- Motor Management System 1
- Table of Contents 3
- Chapter 1: Introduction 7
- Figure 2: Single line diagram 9
- 1.1.3 MM300 order codes 10
- 1.2 Specifications 12
- 1.2.4 Control specifications 14
- 1.2.5 Inputs specifications 14
- 1.2.6 Outputs specifications 16
- CERTIFICATION 17
- TYPE TESTS 17
- DIMENSIONS 17
- OPERATING ENVIRONMENT 18
- Chapter 2: Installation 20
- 2.1.2 Product identification 21
- 2.1.3 Mounting 21
- CAUTION: 22
- Figure 5: DIN rail mounting 23
- 853727A1.CDR 24
- 853733A1.CDR 25
- 853734A1.CDR 25
- 2.2.1 Power supply module 28
- 2.2.2 CPU module 28
- MM300 IED 31
- 853745A1.CDR 31
- 2.2.3 Protection modules 32
- Core Balance (Zero Sequence) 33
- 2.2.3.2 Two CT configuration 34
- FUSES - 100 ma typical 35
- 2.2.4 Input/output modules 36
- Consumer & Industrial 39
- Multilin 39
- 2.3 Starter types 40
- Low Voltage 41
- 2.3.3 Two-speed starter 42
- 2.3.6 Soft starter type 48
- 3.1.1.1 Graphical display 51
- 3.1.1.2 Keypad 52
- 3.1.1.3 Control keys 54
- 3.1.1.4 LED indicators 54
- Main menu 55
- Level 1 Level 2 Level 3 55
- 3.1.2.1 Home display page 56
- 3.1.2.2 Default display 56
- 3.1.2.3 Actual values pages 56
- 3.1.2.4 Status pages 57
- 3.1.2.5 Setpoints pages 59
- 3.1.2.6 Diagnostics pages 60
- 3.1.2.7 Control page 61
- 3.1.2.8 Popup windows 61
- 3.1.3.2 Numeric setpoints 63
- 3.1.3.5 Security access 65
- 3.2 Basic control panel 66
- Chapter 4: Software operation 68
- 4.1.1 Software requirements 69
- USB port: 71
- 4.2 Power analysis 76
- 4.2.2 Data logger 79
- Chapter 5: Actual values 82
- 5.2 Metering 83
- 5.2.3 Power metering 84
- 5.2.4 Sensor metering 84
- 5.3 Status 85
- 5.3.3 System Page 86
- 5.3.4 Flex Page 86
- Chapter 6: Setpoints 88
- 6.2 Configuration setpoints 90
- Full Voltage Non-reversing 92
- Full Voltage Reversing 92
- Two Speed Starter 92
- Wye-Delta Starter 92
- 853717A1.CDR 93
- 6.2.1.4 Two-speed starter 94
- 853719A1.CDR 95
- 6.2.1.6 Inverter starter 96
- 853721A1.CDR 97
- 6.2.1.7 Soft starter 98
- 6.2.3 Inputs 101
- 6.2.4 Outputs 102
- 6.2.6 System 107
- 6.2.7 Events 109
- 6.2.8 Waveforms 110
- 6.2.9 Datalog 110
- 6.2.10 Counters 111
- 6.3 Protection elements 113
- 6.3.1.1 Unbalance biasing 113
- 6.3.1.2 Hot/cold biasing 114
- 6.3.1.3 RTD biasing 115
- 6.3.1.4 Overload curve 116
- TIME IN SECONDS 117
- 6.3.1.5 Cooling rate 118
- Time (minutes) 119
- RTD Bias – 121
- Maximum T 121
- RTD Bias – Center T 121
- 6.3.2.1 Mechanical jam 122
- 6.3.3 Electrical protection 125
- Ground CT setpoint 126
- 6.3.3.3 Load increase alarm 127
- 6.3.3.4 Phase undervoltage 127
- 6.3.3.6 Phase overvoltage 128
- 6.3.3.7 Phase reversal 129
- 6.3.3.8 Fuse failure 129
- 6.3.4.1 RTD protection 130
- 6.4 Control elements 133
- 6.4.1.1 Auto/manual control 133
- Start Ctrl 135
- External Stop Action 136
- 6.4.2 Starting duty inhibits 137
- 6.4.3 Process interlocks 139
- 853703A1.CDR 140
- IL Function A setpoint 141
- 6.5 System security 144
- MM300 Motor Management System 146
- Chapter 7: Diagnostics 146
- EVENTS CHAPTER 7: DIAGNOSTICS 147
- 7.2 Digital counters 148
- 7.3 Phasors 150
- 7.4 Product information 151
- 7.5 Learned data 152
- 7.6 Waveform 153
- 7.7 Datalog 154
- Chapter 8: FlexLogic™ 156
- Chapter 9: Communications 162
- Appendix 164
- APPENDIX 165
- Section Number CHANGES 165
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