Delta MM300 Instruction Manual Page 125
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6–38 MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
PROTECTION ELEMENTS CHAPTER 6: SETPOINTS
6.3.3 Electrical protection
6.3.3.1 Current unbalance protection
When an unbalance or phase current exceeds the setpoints, an alarm or trip condition is
generated.
The calculation method is as follows:
Current Unbalance Trip Level
Range: 4 to 40%, in steps of 1, or OFF
Default: 30%
This setpoint specifies the current unbalance trip pickup level. A value of “OFF” disables
the current unbalance trip function.
Current Unbalance Trip Delay
Range: 1 to 60 seconds in steps of 1
Default: 1 second
This setpoint specifies the time the motor unbalance current must meet or exceed
pickup to generate a trip.
Current Unbalance Alarm Level
Range: 4 to 40%, in steps of 1, or OFF
Default: 15%
This setpoint specifies the current unbalance alarm pickup level. A value of “OFF”
disables the current unbalance alarm function.
Current Unbalance Alarm Delay
Range: 1 to 60 seconds in steps of 1
Default: 1 second
This setpoint specifies the time the motor unbalance current must meet or exceed
pickup to generate an alarm.
6.3.3.2 Ground fault protection
When motor stator windings become wet or otherwise suffer insulation deterioration, low
magnitude leakage currents often precede complete failure and resultant destructive fault
currents. Ground fault protection provides early detection of such leakage current,
allowing the motor to be taken offline in time to limit motor damage. However, if a high
magnitude ground fault occurs that is beyond the capability of the contactor to interrupt,
it is desirable to wait for the fuses or an upstream device to provide the interruption.
The ground fault protection will alarm or trip when the ground current magnitude meets or
exceeds the pickup for the specified time, provided that the maximum phase current is less
than 8 × FLA. When used with a core-balance CT, this protection becomes a sensitive
ground fault protection.
A ground fault trip is a serious event, and therefore results in a lockout that can not be
reset until the motor has cooled except with a level 2 or level 3 security login.
Where:
I = average phase current
I = current in a phase with maximum deviation from I
I = MOTOR FULL LOAD CURRENT setpoint
AV
M AV
FLA
≥
I
AV
IFLA
:
UB%
=
|I - I |
MAV
IAV
≤
I
AV
IFLA
:
UB%
=
|I - I |
MAV
IFLA
× 100%
× 100%
If
If
- 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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