Delta MM300 Instruction Manual Page 137
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6–50 MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS CHAPTER 6: SETPOINTS
If an A or B motor contactor is externally energized, the relay will treat this as a start A or B
control, and display an
External Start A Alarm or an External Start B Alarm message.
The stop/start control element also consolidates the various start and stop signals for the
convenience of other elements.
The following setpoint is available:
[Path: Home > Setpoints > Control > Starter]
External Stop Action
Range: Stop, Trip
Default: Stop
This setpoints selects whether an external stop is considered to be an emergency stop
(reset required to clear) or a stop control (no reset required).
6.4.2 Starting duty inhibits
The MM300 provides four elements that guard against excessive starting duty:
• Thermal start inhibit
• Starts per hour inhibit
• Time between starts inhibit
•Restart inhibit
The thermal start inhibit function inhibits starting of a motor if there is insufficient thermal
capacity available for a successful start. The motor start inhibit logic algorithm is defined
by the Start Inhibit Margin setpoint. If this value is “0”, starts are inhibited until thermal
capacity used decays to a level of 15%. If this setpoint is greater than zero, starts are
inhibited while the available thermal capacity is greater than the learned thermal capacity
used at start.
NOTE
NOTE:
The margin should be set to zero if the load varies for different starts.
The learned thermal capacity used at start is the largest value of thermal capacity used
calculated by the thermal model from the last five successful starts, plus a user-defined
margin. The margin is a percentage of this largest of five. A successful motor start is one in
which the motor reaches the running state. See the Start/Stop section of this manual for a
description of running state logic. If the relay does not contain records of five successful
starts, a value of 85% is used for the learned thermal capacity used, which requires the
thermal capacity used to decay to the same 15% level required when the margin setpoint
is zero.
In addition, since a 2% safety margin is included for the relay to determine if Thermal
Capacity Used has decreased enough (ie - the motor has cooled enough) to allow another
restart, in the case where the Start Inhibit margin is set to 0%, Thermal Capacity must
actually reduce to 15% - 2% = 13%.
For example, if the thermal capacity used for the last five starts is 24, 23, 30, 22, and 21%
respectively, and the set margin is 10%, the learned starting capacity used at start is:
Maximum[24%, 23%, 30%, 22%, 21%] /5 x (1 + 10%/100%) = 33%.
If the motor stops with a thermal capacity used of 90%, a start inhibit will be issued until
the motor cools to 100% – 33% - 2% = 65%. If the stopped cool time constant is set to 30
minutes, the inhibit time will be:
30 x ln (90% / 65%) = 9.8 minutes
If the margin is set to zero instead, the inhibit time will be:
30 x ln (90% / (15% - 2%)) = 58 minutes
- 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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