GE MOTOR MANAGER 2 Instruction Manual
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GE Power Management
MM2
MOTOR MANAGER 2
Instruction Manual
MM2 Firmware Revision: 4.0x
MM2 Software Revision: 4.0X or newer
Manual P/N: 1601-0056-DN (GEK-106294)
Copyright © 2001 GE Power Management
®
Units must be powered up at least once per year to avoid deterioration
of electrolytic capacitors and subsequent relay failure.
NOTE
GE Power Management
215 Anderson Avenue, Markham, Ontario
Canada L6E 1B3
Tel: (905) 294-6222 Fax: (905) 294-8512
Internet:
KWWSZZZ*(LQGXVWULDOFRPSP
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Manufactured under an
ISO9001 Registered system.
These instructions do not purport to cover all details or variations in equipment nor provide for every possible contingency to be met in connection with installation, operation, or
maintenance. Should further information be desired or should particular problems arise
which are not covered sufficiently for the purchaser’s purpose, the matter should be
referred to the General Electric Company .
To the extent required the products described herein meet applicable ANSI, IEEE, and
NEMA standards; but no such assurance is given with respect to local codes and ordinances because they vary greatly.
TABLE OF CONTENTS
1. INTRODUCTION
2. INSTALLATION
1.1 OVERVIEW
1.1.1 DESCRIPTION..............................................................................1-1
1.1.2 FEATURES ...................................................................................1-1
1.2 ORDERING
1.2.1 ORDER CODES ...........................................................................1-2
1.2.2 ACCESSORIES ............................................................................1-3
1.2.3 SPECIAL ORDER.........................................................................1-3
1.3 SPECIFICATIONS
1.3.1 MM2 SPECIFICATIONS ...............................................................1-4
2.1 MOUNTING
2.1.1 DESCRIPTION..............................................................................2-1
2.2 INPUTS AND OUTPUTS
2.2.1 PHASE CT INPUTS......................................................................2-5
2.2.2 GROUND FAULT CT INPUT ........................................................2-5
2.2.3 SUPPLY VOLTAGE......................................................................2-5
2.2.4 GROUND SURGE ........................................................................2-5
2.2.5 EXTERNAL CONNECTIONS........................................................2-5
2.2.6 THERMISTOR INPUT...................................................................2-6
2.2.7 ANALOG INPUT ...........................................................................2-6
2.2.8 AUX 2 COIL ..................................................................................2-6
2.2.9 OUTPUT RELAYS ........................................................................2-6
2.2.10 SWITCH INPUTS..........................................................................2-6
2.2.11 PROGRAMMABLE SWITCH INPUTS..........................................2-6
2.2.12 SERIAL COMMUNICATION PORT..............................................2-7
2.2.13 STOP ............................................................................................2-7
2.2.14 START A / START B.....................................................................2-8
2.2.15 LOCAL ISOLATOR N/O................................................................2-8
2.2.16 CONTACTOR STATUS................................................................2-8
2.2.17 SWITCH COMMON......................................................................2-8
2.2.18 DIELECTRIC STRENGTH TESTING ...........................................2-8
3. HARDWARE
GE Power Management
3.1 FACEPLATE FUNCTIONS
3.1.1 DESCRIPTION..............................................................................3-1
3.1.2 MESSAGE DISPLAY ....................................................................3-1
3.1.3 INDICATOR LEDs.........................................................................3-2
3.2 KEYPAD
3.2.1 SETPOINTS KEY..........................................................................3-3
3.2.2 ACTUAL VALUES KEY.................................................................3-3
3.2.3 STORE KEY..................................................................................3-4
3.2.4 STOP KEY ....................................................................................3-4
3.2.5 RESET KEY .................................. ................................................3-4
3.2.6 START A KEY...............................................................................3-4
3.2.7 START B KEY...............................................................................3-5
3.2.8 MESSAGE UP/DOWN KEYS .......................................................3-5
3.2.9 MESSAGE LEFT/RIGHT KEYS....................................................3-5
3.2.10 VALUE UP/DOWN KEYS .............................................................3-5
3.3 THEORY OF OPERATION
3.3.1 HARDWARE DESCRIPTION........................................................3-6
MM2 Motor Manager 2 i
TABLE OF CONTENTS
4. SETPOINTS
4.1 OVERVIEW
4.1.1 DESCRIPTION............................................................................. 4-1
4.1.2 ABBREVIATIONS ........................................................................ 4-1
4.2 S1 CONFIGURATION
4.2.1 DESCRIPTION............................................................................. 4-3
4.2.2 COMMUNICATIONS.................................................................... 4-3
4.2.3 MOTOR IDENTIFICATION ............................. ...... ...... ..... ...... ...... 4-3
4.2.4 STARTER.....................................................................................4-4
4.2.5 CT / VT INPUTS........................................................................... 4-5
4.2.6 THERMISTOR.............................................................................. 4-6
4.2.7 FAULT MODE .............................................................................. 4-6
4.2.8 STATISTICS.................................................................................4-7
4.2.9 PROGRAMMABLE MESSAGE.................................................... 4-7
4.2.10 PREFERENCES .......................................................................... 4-7
4.3 S2 PROTECTION
4.3.1 DESCRIPTION............................................................................. 4-8
4.3.2 STANDARD OVERLOAD CURVES............................................. 4-8
NEMA COMPATIBLE OVERLOAD CURVES
4.3.3
4.3.4 MOTOR PROTECTION – THERMAL ........................................ 4-12
4.3.5 MOTOR PROTECTION – GROUND FAULT............................. 4-13
4.3.6 MOTOR PROTECTION – OPTIONS......................................... 4-15
4.3.7 LOAD PROTECTION................................................................. 4-17
4.3.8 UNDER/OVERVOLTAGE PROTECTION.................................. 4-19
...........................4-10
4.4 S3 PROCESS
4.4.1 DESCRIPTION........................................................................... 4-20
4.4.2 PROGRAMMABLE INPUTS ...................................................... 4-20
4.4.3 INTERLOCK NAMES................................................................. 4-25
4.4.4 STOP CONFIGURATION .......................................................... 4-25
4.4.5 ANALOG INPUT......................................................................... 4-26
5. ACTUAL VALUES
4.5 S4 CONTROL
4.5.1 DESCRIPTION........................................................................... 4-28
4.5.2 UNDERVOLTAGE AUTORESTART.......................................... 4-28
4.5.3 AUX RELAY 1/2 CONFIG .......................................................... 4-29
4.6 S5 MONITORING
4.6.1 DESCRIPTION........................................................................... 4-32
4.6.2 PLANT CONDITION................................................................... 4-32
4.6.3 PRESET COUNTERS AND TIMERS......................................... 4-33
4.7 S6 FACTORY DATA
4.7.1 DESCRIPTION........................................................................... 4-34
4.7.2 PRODUCT FIRMWARE ............................................................. 4-34
4.7.3 PRODUCT MODEL IDENTIFICATION ...................................... 4-34
4.7.4 FACTORY SERVICE DATA.......................................................4-34
5.1 OVERVIEW
5.1.1 DESCRIPTION............................................................................. 5-1
5.1.2 DEFAULT MESSAGE SELECTION.............................................5-1
5.1.3 ABBREVIATIONS ........................................................................ 5-2
5.2 A1 DATA
5.2.1 DESCRIPTION............................................................................. 5-3
5.2.2 MOTOR DATA ................................ ..... ...... .................................. 5-3
ii MM2 Motor Manager 2
GE Power Management
TABLE OF CONTENTS
5.2.3 PROCESS DATA..........................................................................5-4
5.2.4 PROGRAMMABLE MESSAGE.....................................................5-4
5.3 A2 STATUS
5.3.1 DESCRIPTION..............................................................................5-5
5.3.2 TRIP DATA ...................................................................................5-5
5.3.3 ALARM DATA ...............................................................................5-6
5.3.4 MOTOR STATUS..................................... ...... ...............................5-8
5.4 A3 INPUTS
5.4.1 DESCRIPTION..............................................................................5-9
5.4.2 INPUT CONTACTS STATUS .................................................... ...5-9
5.5 A4 STATISTICS
5.5.1 DESCRIPTION............................................................................5-11
5.5.2 TIMERS.......................................................................................5-11
5.5.3 COUNTERS ................................................................................5-11
6. COMMUNICATIONS
6.1 MM2 MODBUS PROTOCOL
6.1.1 OVERVIEW...................................................................................6-1
6.1.2 ELECTRICAL INTERFACE...........................................................6-1
6.1.3 DATA FRAME FORMAT AND DATA RATE.................................6-1
6.1.4 DATA PACKET FORMAT.......................................................... ...6-2
6.1.5 ERROR CHECKING .....................................................................6-2
6.1.6 CRC-16 ALGORITHM...................................................................6-3
6.1.7 TIMING..........................................................................................6-4
6.1.8 MM2 SUPPORTED FUNCTIONS.................................................6-4
6.2 MODBUS FUNCTIONS
6.2.1 FUNCTION CODE 01H.................................................................6-5
6.2.2 FUNCTION CODE 03H.................................................................6-6
6.2.3 FUNCTION CODE 04H.................................................................6-7
6.2.4 FUNCTION CODE 05H.................................................................6-8
6.2.5 FUNCTION CODE 06H.................................................................6-9
6.2.6 FUNCTION CODE 07H...............................................................6-10
6.2.7 FUNCTION CODE 08H...............................................................6-11
6.2.8 FUNCTION CODE 10H...............................................................6-12
6.3 ERROR RESPONSES
6.3.1 DESCRIPTION............................................................................6-13
6.4 APPLICATIONS
6.4.1 PERFORMING COMMANDS USING FUNCTION CODE 10H...6-14
6.4.2 STORING COMM ADDRESS USING THE BROADCAST
COMMAND.................................................................................6-15
6.4.3 USING THE USER DEFINABLE MEMORY MAP.......................6-16
6.4.4 USER DEFINABLE MEMORY MAP DEFAULT VALUES...........6-17
GE Power Management
6.5 MEMORY MAP
6.5.1 DESCRIPTION............................................................................6-19
6.5.2 MEMORY MAP TABLE...............................................................6-20
6.6 DATA FORMATS
6.6.1 DATA FORMATS TABLE..................................... ..... ...... ..... .......6-41
MM2 Motor Manager 2 iii
TABLE OF CONTENTS
7. TESTING
8. MM2PC® SOFTWARE
7.1 INJECTION TESTING
7.1.1 PRIMARY INJECTION TESTING ................................................ 7-1
7.1.2 SECONDARY INJECTION TESTING.......................................... 7-1
7.2 FUNCTIONAL TESTS
7.2.1 PHASE CURRENT FUNCTIONS................................................. 7-3
7.2.2 UNBALANCE EXAMPLES .................................... ...... ..... ...... ...... 7-4
7.2.3 GROU ND FAULT CURRENT FUNCTIONS ................................7-5
7.2.4 INPUT FUNCTIONS.............................................. ...... ..... ...... ...... 7-5
7.2.5 THERMISTOR INPUT TESTS ..................................................... 7-6
7.2.6 POWER FAIL TEST.....................................................................7-6
8.1 OVERVIEW
8.1.1 DESCRIPTION............................................................................. 8-1
8.1.2 HARDWARE & SOFTWARE REQUIREMENTS.......................... 8-1
8.1.3 CHECKING IF INSTALLATION/UPGRADE IS REQUIRED ........ 8-2
8.2 INSTALLING MM2PC
8.2.1 SOFTWARE INSTALLATION/UPGRADE .................................... 8-3
®
8.3 CONFIGURATION
8.3.1 CONFIGURING MM2PC®............................................................ 8-4
8.3.2 MM2PC
8.4 USING MM2PC
8.4.1 SAVING SETPOINTS TO A FILE ................................................ 8-7
8.4.2 MM2 FIRMWARE UPGRADES.................................................... 8-8
8.4.3 LOADING SETPOINT FILES ....................................................... 8-9
8.4.4 ENTERING SETPOINTS ........................................................... 8-10
8.4.5 VIEWING ACTUAL VALUES ..................................................... 8-11
®
PROGRAM MENUS..................................................... 8-6
®
9. STARTER TYPES
8.5 CHASSIS MOUNT UNITS
8.5.1 DESCRIPTION........................................................................... 8-13
8.5.2 SETTING THE BAUD RATE AND PARITY ...............................8-13
9.1 FV NON-REVERSING STARTER
9.1.1 DESCRIPTION............................................................................. 9-1
9.1.2 MM2 SEQUENCES...................................................................... 9-1
9.2 FV REVERSING STARTER
9.2.1 DESCRIPTION............................................................................. 9-3
9.2.2 MM2 SEQUENCES...................................................................... 9-4
9.2.3 NOTES......................................................................................... 9-4
9.3 TWO SPEED STARTER
9.3.1 DESCRIPTION............................................................................. 9-6
9.3.2 MM2 SEQUENCES...................................................................... 9-7
9.4 SLIP RING STARTER
9.4.1 DESCRIPTION........................................................................... 9-11
9.4.2 MM2 SEQUENCES.................................................................... 9-12
9.5 PRIMARY RESISTANCE STARTER
9.5.1 DESCRIPTION........................................................................... 9-14
9.5.2 MM2 SEQUENCE ...................................................................... 9-15
iv MM2 Motor Manager 2
GE Power Management
TABLE OF CONTENTS
9.6 INVERTER STARTER
9.6.1 DESCRIPTION............................................................................9-17
9.6.2 MM2 SEQUENCES.....................................................................9-18
9.7 AUTOTRANSFORMER OPEN TRANSITION STARTER
9.7.1 DESCRIPTION............................................................................9-20
9.7.2 MM2 SEQUENCES.....................................................................9-21
9.8 AUTOTRANSFORMER CLOSED TRANSITION STARTER
9.8.1 DESCRIPTION............................................................................9-24
9.8.2 MM2 SEQUENCES.....................................................................9-25
9.9 PART WINDING STARTER
9.9.1 DESCRIPTION............................................................................9-28
9.9.2 MM2 SEQUENCE.......................................................................9-28
9.10 WYE-DELTA OPEN TRANSITION STARTER
9.10.1 DESCRIPTION............................................................................9-29
9.10.2 MM2 SEQUENCES.....................................................................9-30
9.11 WYE-DELTA CLOSED TRANSITION STARTER
9.11.1 DESCRIPTION............................................................................9-32
9.11.2 MM2 SEQUENCE.......................................................................9-33
9.12 DUTY/STANDBY STARTER
9.12.1 DESCRIPTION............................................................................9-35
9.12.2 MM2 SEQUENCES.....................................................................9-35
9.12.3 NOTES........................................................................................9-36
10.CONTROL WIRE
APPLICATIONS
A. MM2 COMMISSIONING
9.13 SOFT STARTER
9.13.1 DESCRIPTION............................................................................9-38
9.13.2 MM2 SEQUENCE.......................................................................9-38
10.1 TWO WIRE CONTROL
10.1.1 DESCRIPTION......................................... ...................................10-1
10.1.2 CONTROL OPERATION ............................................................10-1
10.2 HAND/OFF/AUTO CONFIGURATION
10.2.1 2-WIRE HAND / 2-WIRE AUTO..................................................10-3
10.2.2 CONTROL OPERATION ............................................................10-3
10.2.3 3-WIRE HAND / 2-WIRE AUTO..................................................10-5
10.2.4 CONTROL OPERATION ............................................................10-5
10.2.5 3 WIRE HAND / 3 WIRE AUTO..................................................10-7
10.2.6 CONTROL OPERATION ............................................................10-7
10.3 HAND/AUTO CONFIGURATION
10.3.1 3-WIRE HAND / 2-WIRE AUTO..................................................10-9
A.1 COMMISIONING SUMMARY
A.1.1 DESCRIPTION......................... ....................................................A-1
B. MM2 FAQ
GE Power Management
B.1 MM2 FAQ
B.1.1 QUESTIONS AND ANSWERS....................................................B-1
MM2 Motor Manager 2 v
TABLE OF CONTENTS
C. DO’S AND DONT’S
D. ASYMMETRICAL
CURRENT
E. CT ISOLATION
F. FIGURES AND TABLES
G. MISCELLANEOUS
C.1 DO’S AND DONT’S
C.1.1 CHECKLIST.................................................................................C-1
D.1 ASYMMETRICAL CURRENT
D.1.1 OVERVIEW..................................................................................D-1
E.1 CT ISOLATION
E.1.1 MM2 CT WITHSTAND .................................................................E-1
E.1.2 CT SIZE AND SATURATION.......................................................E-1
F.1 LISTS
F.1.1 LIST OF FIGURES.......................................................................F-1
F.1.2 LIST OF TABLES......................................................................... F-2
G.1 EU DECLARATION OF CONFORMITY
0.1 GE POWER MANAGEMENT WARRANTY
vi MM2 Motor Manager 2
GE Power Management
1 INTRODUCTION 1.1 OVERVIEW
1 INTRODUCTION
The MM2 combines control functions normally found in a low voltage motor control center (MCC)
with motor protection. This compact, microprocessor-based device provides sophisticated control
and protective relaying at significant cost savings over an MCC design using discrete devices.
Standard features in every MM2 simplify maintenance and plan t expans ion. One MM2 is requi red for
every starter unit in the MCC. The contactor can be energized and de-energized using the MM2’s
direct-wired inputs, or via the serial port. Full Voltage Non-reversing, Full Voltage Reversing, Two
Speed, Autotransformer, Inverter, Wye-Delta, Slip Ring, and Part Winding type starters may be completely controlled by the MM2 using the two contactor outputs.
Motor protection is included for the most common causes of failure to prevent costly shutdowns and
rewinds. These include 3 phase overload, stalled rotor, ground fault and loss of phase.
A two wire RS485 Modbus protocol communications port i s pro vid ed for high -spee d communicati ons
with a complete line-up of MCCs. Any MM2 may be interrogated on demand, to determine both
Actual and Setpoint operating parameters. Fast response time to a request for alarm or trip status
makes real time control of a complete process possible. Statistical recording of running hours and
number of starts and trips assists with predictive maintenance scheduling.
The MM2 has been developed with economy in mind. The customer is able to choose from different
options to achieve maximum benefit from the relay when integrated into the process environment.
1.1 OVERVIEW 1.1.1 DESCRIPTION
1.1.2 FEATURES
1
The basic MM2 comes with 3 phase overload protection (49/51), single phase, 4 control inputs
(Start, Stop, Local Isolator, Contactor A status) plus 2 programmable inputs. Depending upon which
option is ordered, the following addit ional features are available:
•20×2 alphanumeric display (Option PD)
• 8 additional programmable inputs (Option 1)
• 2 additional electromechanical relays: Aux Relay 1 and Aux Relay 2 (Option 1)
• 4 to 20 mA process analog input (Option 1)
• programmable undervoltage restart of motors following an undervoltage condition (Option 1)
• diagnostics which includes pretrip data and historical statistics (Option 1)
• 2nd contactor control (wye/delta, two speed, reversing, etc.) which i n cludes all timers, relays and
control inputs (Option 2)
• ground fault trips (50G/51G) (Optio n 2)
• stalled rotor protection (48) (Opt ion 2)
• single voltage input which allows the MM2 to calculate and display kW and kWh (Option 2)
• undercurrent/underpower protection (37) (Option 2)
• thermistor (49) input which accepts PTC and NTC thermistor types (Option 2)
• overvoltage (59) and undervoltage (27) protection (Option 2)
GE Power Management
MM2 Motor Manager 2 1-1
1.2 ORDERING 1 INTRODUCTION
1.2 ORDERING 1.2.1 ORDER CODES
1
NOTE
This instruction manual describes the features of a MM2 with all options incl uded.
Table 1–1: SELECTION GUIDE
g g g g
PD | | | Panel Mount with Display (only available with both options)
C | | | Chassis Mount (Black Box)
1 | | Option 1: Process control, 10 process inputs, undervoltage
autorestart, diagnostics
2 | | Option 1: Enhanced protection, power (kW), thermistor, 2nd
contactor control, 2 process inputs
120 120 V AC Control Voltage
240 240 V AC Control Voltage
Base Unit
Mounting
Option 1
Option 2
Power
MM2
MM2 | | | | Product Family
All models contain three phase overload protection (49/51), single phase, 4 control inputs
(start, stop, local isolator, contactor A status), plus two programmable inputs and one output
NOTE
relay. The control voltage can be changed in the field.
a) MOUNTING
Chassis Mount: “Black box” version of the MM2 mounted inside the MCC starter.
Panel Mount with Display: Mounted on a panel with a 20 × 2 display, LEDs, and keypad. This fea-
ture is only available with both options
b) OPTION 1
Process Control and Process Inputs: Incl udes 10 programmable switch inputs, 2 extra electrome-
chanical relays (Aux1 and Aux2), and a 4 to 20 mA input.
Undervoltage Auto-Restart: Programmable under voltage restart following undervoltage condition.
Diagnostics: Alarms, pretrip data, and historical statistics about the motor or drive performance.
c) OPTION 2
2nd Contactor Control: Includes all timers, contactor A and B relays, and 2 programmable switch
inputs for two-contactor starter types such as wye/delta, two-speed, and reversing.
Enhanced Protection: Includes ground faul t, stalled rotor, and undercurrent protection.
Power (kW): Includes a single VT input allowing for calculation of kW and kWhrs, as well as under-
power alarm.
Thermistor: Includes a thermistor i nput with alarm or trip sett ings for NTC and P TC type ther mistors.
1-2 MM2 Motor Manager 2
GE Power Management
1 INTRODUCTION 1.2 ORDERING
1.2.2 ACCESSORIES
MM2PC
RS-232/485: RS232 to RS485 converter box designed for harsh industrial envi ronments
5A Phase CT: 50,75,100,150,200,250,300,350,400,500,600,750,1000
1A Phase CT: 50,75,100,150,200,250,300,350,400,500,600,750,1000
50:0.025 Ground CT: For sensitive ground detection on high resistance grounded systems
Collar: For reduced depth mounting
MOD601 – 240 V AC Switch Inputs: Allows use of external 240 VAC supply to power swi tch in puts .
MOD602 – 24 to 48 V DC Switch Inputs: Allows use of external 24 to 48 V DC supply to power
switch inputs.
MOD603 – ESD Relay: Converts AUX Relay 2 into an Emergency Shutdown Relay.
MOD605 – Removable Rear Terminals: Allows terminals 13 to 58 to be unplugged from the MM2.
MOD610 – Conformal: Provides protect ion in harsh environments.
MOD613 – 240 VAC VT Input: Allows 240 V AC to be applied to the VT input.
MOD614 – 7200 VT Primary Setting: VT PRIMARY setpoint up to 7200 V and Variable Overload
Curve setting.
®
Software: Software package to aid in setting up MM2 operating parameters (free)
1.2.3 SPECIAL ORDER
1
MOD615 – 7200 VT Primary Setting: VT PRIMARY setpoint up to 7200 V and Backspin Timer.
GE Power Management
MM2 Motor Manager 2 1-3
1.3 SPECIFICATIONS 1 INTRODUCTION
1.3 SPECIFICATIONS 1.3.1 MM2 SPECIFICATIONS
1
NOTE
Design and specifications are subject to change without notice.
PHASE CURRENT INPUTS
CONVERSION: true RMS, sample time 1.67ms
RANGE: 0.1 to 8 ×
FULL SCALE: 8 ×
ACCURACY: ±2% of
PHASE CT PRIMARY AMPS
PHASE CT PRIMARY AMPS
PHASE CT PRIMARY AMPS
setpoint
setpoint
setpoint or ±2% of reading, whichever is greater
GROUND FAULT CURRENT INPUT
CONVERSION: true RMS, sample time 1.67 ms
RANGE: 0.1 to 1.0 ×
0.5 to 15.0 A (for 50:0.025 CT)
FULL SCALE: 1.5 ×
15 A (for 50:0.025 CT)
ACCURACY: for 5A CT: ±2% of full scale (5A CT)
for 50:0.025 CT: ±0.10 A (0.0 to 3.99 A)
G/F CT PRIMARY AMPS
G/F CT PRIMARY AMPS
±0.20 A (4.00 to 15.00 A)
setpoint (for 5 A secondary CT)
setpoint (for 5 A secondary CT)
VOLTAGE INPUT / POWER READING
CONVERSION: true RMS, sample time 1.67ms
VOLTAGE FULL SCALE: 1.5 × VT Primary
VOLTAGE ACCURACY: ±2% of VT Primary or ±2% of reading, whichever is greater
POWER ACCURACY: ±5% of nominal or ±5% of reading, whichever is greater
INPUT VOLTAGE: Nominal: 120 V AC or 110 V AC
Maximum: 150 V AC
VT BURDEN: 0.01 VA
OVERLOAD CURVES
TRIP TIME ACCURACY: ±200 ms up to 10 seconds
±2% of trip time over 10 seconds
DETECTION LEVEL: ± 1% of primary CT amps
GROUND FAULT TRIP TIME
ACCURACY: –0 ms / +50 ms, 0.0 = less than 50 ms
ACCELERATION TIME
RANGE: 0.5 to 125 seconds or OFF
ACCURACY: ±0.5 seconds
SINGLE PHASE
RANGE: greater than 30% U/B
ACCURACY: ± 2 percentage points
TRIP DELAY: 5 seconds ± 1 second
1-4 MM2 Motor Manager 2
GE Power Management
1 INTRODUCTION 1.3 SPECIFICATIONS
–
IMI
CALCULATION METHOD: if
≥
I
I
:
AV
<
I
if
AV
where
I
= current in a phase with maximum deviation from
M
I
=
FLC
UB%
FLC
I
:
UB%
FLC
I
= average phase current
AV
MOTOR FULL LOAD CURRENT
=
=
AV
----------------------
i
AV
–
IMI
AV
----------------------
i
AV
×
100%
×
100%
setpoint
I
AV
THERMAL COOLING TIMES
RANGE: 5 to 1080 min when motor is stopped;
50% of motor stopped value when motor is running.
ACCURACY: ± 1 minute
UNDERCURRENT
RANGE: 10 to 100% × motor FLC or OFF
DELAY RANGE: 1 to 60 seconds
ACCURACY: ±1 second
STALLED ROTOR
RANGE: 1.15 to 4.50 × FLC or OFF
DELAY RANGE: 0.5 to 5 seconds
ACCURACY: ±0.5 second
1
THERMISTOR INPUTS
SENSOR TYPES: positive temperature coefficient PTC;
negative temperature coefficient NTC;
DELAY: 1 second
ACCURACY: ±5% or 100 Ω (whichever is greater)
R
=100 to 30000
HOT
R
=100 to 30000
HOT
Ω
Ω
ANALOG INPUT
RANGE: 4 to 20 mA
ACCURACY: ±1% of full scale
ALARM: programmable 4 to 20 mA
TRIP: programmable 4 to 20 mA
COMMUNICATIONS
TYPE: RS485 2 wire, half duplex
BAUD RATE: 1200 to 19200 baud
PROTOCOL: Modbus RTU
FUNCTIONS: Read/write setpoints, Read coil status, Read actual values, Read device status,
Execute commands, Loopback Test
GE Power Management
MM2 Motor Manager 2 1-5
1.3 SPECIFICATIONS 1 INTRODUCTION
MM2 CONTACTOR A & B AND AUX 2 OUTPUT RELAY CONTACTS
1
VOLTAGE BREAK MAKE/CARRY
30 V DC 10 A
RESISTIVE
INDUCTIVE
(L/R = 7 ms)
RESISTIVE
INDUCTIVE
(PF = 0.4)
CONFIGURATION: CONTACTOR A AND B: Form A
CONTACT MATERIAL: Silver Alloy (AgCdO)
MAX. OPERATING VOLTAGE: 280 V AC, 250 V DC
MAXIMUM PERMISSIBLE LOAD: 5 V DC, 100 mA
125 V DC 0.5 A
250 V DC 0.3 A
30 V DC 5 A
125 V DC 0.25 A
250 V DC 0.15 A
120 V AC
10 A
240 V AC
120 V AC 10 A
225 V AC 8 A
AUX RELAY 2: Form C
MM2 AUX 1 OUTPUT RELAY CONTACTS
CONTINUOUS
10 A 30 A
MAKE/CARRY
0.2 seconds
VOLTAGE BREAK MAKE/CARRY
CONTINUOUS
RESISTIVE
INDUCTIVE
(L/R = 7 ms)
RESISTIVE
INDUCTIVE
(PF = 0.4)
CONFIGURATION: Dual Form C
CONTACT MATERIAL: Silver Alloy (AgCdO)
MAX. OPERATING VOLTAGE: 280 V AC, 125 V DC
30 V DC 5 A
125 V DC 0.25 A
30 V DC 2.5 A
125 V DC 0.1 A
5 A 15 A
120 V AC
5 A
240 V AC
120 V AC 5 A
225 V AC 3 A
UNDERVOLTAGE – SUPPLY VOLTAGE
UNDERVOLTAGE: 65% of nominal (120 V AC or 240 V AC);
Immediate restart for maximum dip time of 0.1 to 0.5 seconds or OFF;
Delayed restart for maximum dip time of 0.1 to 10.0 seconds or UNLIMITED time
DELAY RESTART RANGE: 0.2 to 300 seconds
DELAY RESTART ACCURACY: ±0.2 seconds
MAKE/CARRY
0.2 seconds
1-6 MM2 Motor Manager 2
GE Power Management
1 INTRODUCTION 1.3 SPECIFICATIONS
CT BURDEN
CT INPUT CURRENT BURDEN
VA OHMS
1 A 0.009
1 A PHASE CT
5 A PHASE CT
5 A GROUND CT
50:0.025
GROUND CT
20 A 3.5
5 A 0.04
100 A 16
5 A 0.04
100 A 17
0.025 A 0.07 116
0.1 A 1.19 119
0.5 A 30.5 122
0.015 A 0.2
0.00225 A 0.9
0.00225 A 1.1
CT WITHSTAND (1 A / 5 A PHASE CTs; 5 A GROUND CT)
CT INPUT 1 SEC 5 SEC CONTINUOUS
1 A PHASE CT
100 × CT 40 × CT 3 × CT5 A PHASE CT
1
5 A GROUND CT
CT WITHSTAND (50:0.025 A GROUND CT)
CONTINUOUS: 150 mA
MAXIMUM: 12 A for 3 cycles
SUPPLY VOLTAGE
AC NOMINAL: 120 V AC, range 80 to 135 V AC
240 V AC, range 150 to 250 V AC
FREQUENCY: 50/60 Hz
POWER CONSUMPTION: 25 VA (maximum), 7 VA (nominal)
TYPE TESTS
TRANSIENTS: ANSI/IEEE C37.90.1 Oscillatory/Fast Risetime Transients
IEC 801-4 Electrical Fast Transient/Burst Requirements
IMPULSE: IEC 255-5 5 kV Impulse Voltage Test
RFI: 150 MHz, 450 MHz 5 W Handheld Transmitter at 25 cm
ST ATIC: IEC 801-2 Electrostatic Discharge
HI-POT: 1500 V, 1 minute; all inputs > 30 V
GE Power Management
MM2 Motor Manager 2 1-7
1.3 SPECIFICATIONS 1 INTRODUCTION
ENVIRONMENT/GENERAL INFORMATION
POLLUTION DEGREE: 2
1
OVERVOLTAGE CATAGORY: 2
INSULATION VOLTAGE: 300 V
OPERATING TEMPERATURE RANGE: 0°C to 60°C
DUST & MOISTURE RATING: NEMA Type 12 and 12K
IP CLASS: IEC 529 - IP53
WEIGHT
MAX WEIGHT: 4 lbs. (1.8 kg)
SHIPPING BOX SI ZE: 8.30” (211 mm) × 5.625” (143 mm) × 5.80” (147 mm)
FUSE TYPE/RATING
0.5 A; 250 V Fast Blow, High breaking capacity
INSTALLATION
WARNING: HAZARD may result if the product is not used for its intended purpose
VENILATION REQUIREMENTS: None
CLEANING REQUIREMENTS:None
CERTIFICATION/COMPLIANCE
CE: IEC 947-1,IEC 1010-1
CSA: Approved File No. LR41286
UL: Recognized File No. E83849
QUALITY ASSURANCE SYSTEM: Registered by QMI to CSA CAN3.Z299.3-1985 & ISO 9001-1994
NOTE
It is recommended that all MM2 relays are powered up at least once per year to avoid
deterioration of electrolytic capacitors in the power supply.
1-8 MM2 Motor Manager 2
GE Power Management
2 INSTALLATION 2.1 MOUNTING
2 INSTALLATION
Cut the panel as shown below to mount the MM2. Use either the #8-32 or #6×½” mounting screws
provided to mount the MM2 to the panel.
2.1 MOUNTING 2.1.1 DESCRIPTION
2
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Figure 2–1: MM2 MOUNTING INSTRUCTIONS
MM2 Motor Manager 2 2-1
2.1 MOUNTING 2 INSTALLATION
The dimensions for the standard MM2 and the MM2 with reduced mounting collar are shown below:
2
Figure 2–2: MM2 DIMENSIONS
Figure 2–3: MM2 WITH DEPTH REDUCTION COLLAR DIMENSIONS
2-2 MM2 Motor Manager 2
GE Power Management
2 INSTALLATION 2.1 MOUNTING
2
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Figure 2–4: TYPICAL WIRING DIAGRAM
MM2 Motor Manager 2 2-3
2
2.1 MOUNTING 2 INSTALLATION
52
480 VOLT BUS480 VOLT BUS
FUSEFUSE
CONTCONTACTACTOROR
PHASE PTPHASE PT
PHASE CTPHASE CT
GROUND CTGROUND CT
THERMISTOR
MOTOR
WINDINGWINDING
THERMISTTHERMISTOROR
LOAD
CONTACTOR ACONTACTOR A
(FOR(FORWARD/WYE)ARD/WYE)
CONTACTOR BCONTACTOR B
(REVERSE/DEL(REVERSE/DELTA)
51 49 37
51G
MOTOR
49
MANAGER 2MANAGER 2
46
AUXAUX
1
RELARELAY
AUXAUX
2
RELARELAY
CONTROLCONTROL
INPUTSINPUTS
4-20mA4-20mA
INPUTINPUT
RS485 REMOTERS485 REMOTE
COMMUNICACOMMUNICATIONTION
1200-19K2 BAUD1200-19K2 BAUD
PROCESSPROCESS
PLC ORPLC
OR
TRANSDUCERTRANSDUCER
Figure 2–5: MM2 FUNCTIONAL BLOCK DIAGRAM
2-4 MM2 Motor Manager 2
GE Power Management
2 INSTALLATION 2.2 INPUTS AND OUTPUTS
2.2 INPUTS AND OUTPUTS 2.2.1 PHASE CT INPUTS
Both 5 A and 1 A current transformer secondaries are accommodated by the MM2. Each phase current input to the MM2 has 3 terminals: 5 A input, 1 A input, and the common input. For example, if th e
phase CTs are 200:5, connect phase 1, 2, and 3 CT secondaries to terminals 1/3, 4/6, and 7/9,
respectively. For motor full-load currents up to 10 A, the phase conductors can be direct connected
to the MM2 with no phase CTs required providing that the voltage at the CT terminals does not
exceed 600 V RMS.
CTs should be selected to be capable of supplying the required current to the total secondary load
which includes the MM2 relay burden of 0.1 VA at rated secondary current and the connection wiring
burden. The CT must not saturate under maximum current conditions which can be up to 8 times
motor full load during starting.
2.2.2 GROUND FAULT CT INPUT
The ground CT has a 5 A input, a 50:0.025 input, and a common input. The 5 A input on the ground
CT is used for 5 A secondary CTs or for residual connection of phase CTs. Residual ground fault protection provides a sensitivity of 5% of motor Phase CT Primary. The 50:0.025 core balance (zerosequence) CT input can be used for improved sensitivity when measuring the ground fault current.
2
Care must be taken when turning ON the Ground Fault Trip feature. If the interrupting
device (contactor or circ uit breaker ) is not ra ted to break gro und f ault c urr ent (l ow r esist ance
NOTE
Supply voltage of 120/240 V AC, 50 or 60 Hz, is required to power t he MM2. T he label on the back o f
the unit will specify the voltage which has been internally set inside the MM2. To change the voltage
setting, open the sliding door on the back of the MM2 and locate the supply voltage selector slide
switch. The selector slide switc h has a label af fixed to show t he 120/240 VAC positions. Set the slide
switch to the desired voltage.
This is an additional ground terminal provided for dissipating transient signals and surges. This must
be connected by a thick wire or braid to the system gro und for reliable operation.
Signal wiring is to box terminals that can accommodate wire as large as 12 gauge. CT connections
are made using #8 screw ring terminals that can accept wire as large as 8 gauge. Consult Figure 2–
4: TYPICAL WIRING DIAGRAM on page 2–3. Other features can be wired as required.
or solidly grounded systems), the feature should be disabled. The 50:025 input is only recommended to be used on resistance grounded systems. Where the system is solidly
grounded or high levels of current are to be detected use the 5 A ground input.
2.2.3 SUPPLY VOLTAGE
2.2.4 GROUND SURGE
2.2.5 EXTERNAL CONNECTIONS
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MM2 Motor Manager 2 2-5
2.2 INPUTS AND OUTPUTS 2 INSTALLATION
2.2.6 THERMISTOR INPUT
Either a Positive Temperature Coefficient (PTC) or Negative Temperature Coefficient (NTC) thermistor may be directly connected to the MM2. By specifying the hot and cold thermistor resistance,
the MM2 automatically determines the thermistor type as NTC or PTC. Use thermistors with hot and
cold resistance values in the range 100 to 30000Ω. If no thermistor is connected, the thermistor
alarm and trip detection must be set to DISABLE in the S1: CONFIGURATION \ THERMISTOR page.
2
2.2.7 ANALOG INPUT
The analog input accepts an input from a standard 4 to 20 mA source. This input can be used for
process control monitoring to provide status and/or alarm and tripping signals related to the level of
the input signal. The analog input messages (S3: PROCESS \ ANALOG INPUT) can be programmed to
show a user defined name and units.
2.2.8 AUX 2 COIL
The AUX Relay 2 can be internally energized by the MM2 or externally energized by applying a 24
V DC signal to these terminals. Correct polarity is requir ed (Terminal 21 = +24 V DC, Terminal 22 = 0
V DC).
2.2.9 OUTPUT RELAYS
There are up to 4 output relays on t he MM2. Contact s witching ra ting fo r the output r elays as well can
be found in Section 1.3: SPECIFICATIONS on page 1–4.
• Contactor A Relay (34/35): non-reversing, forward, low speed, etc.
• Contactor B Relay (32/33): reversing, high speed, etc.
• AUX Relay 1 (26/27/28, 29/30/31): field programmable
• AUX Relay 2 (23/24/25): field programmable or hard-wired 24 V DC coil
2.2.10 SWITCH INPUTS
SWITCH INPUT COMMON TERMINALS 57 AND 58 ARE LIVE 120 VAC.
CAUTION
All switch inputs are opto-isolated and operate at a voltage of 120 V AC. The switch will read closed
when 120 VAC is applied to the switch terminal. This 120 V AC can be supplied from the switch common terminals (57, 58) or from an external source providing that the source is in phase with the supply voltage of the MM2.
2.2.11 PROGRAMMABLE SWITCH INPUTS
These 10 inputs can be programmed to one of a number of differ ent funct ions. Some of th e availabl e
functions are: Setpoint Access, Lockout Reset, Plant Interlock, Auto Start, Remote Permissive, and
Test. See the S3: PROCESS \ PROGRAMMABLE INPUTS page for complete list of available functions.
2-6 MM2 Motor Manager 2
GE Power Management
2 INSTALLATION 2.2 INPUTS AND OUTPUTS
2.2.12 SERIAL COMMUNICA TION PORT
A serial port provides communication capabilities to the MM2. Multiple MM2s can be connected
together with a 24 AWG stranded, shielded twisted pair with a characteristic impedance of 120
such as Belden 9841 or equivalent. The total length of communications wiring should not exceed
4000 feet. Care should be used when routing the communications wiring to keep away from high
power AC lines and other sources of electrical noise.
Correct polarity is essential for the communications port to operate. Terminal 39 ("+") of every MM2
in a serial communication link must be connected together. Similarly, Terminal 40 ("–") of every MM2
must also be connected together. The shield wire must be connected to Terminal 38 (485 SERIAL
GROUND) on every unit in the link to provide a common ground potential for all units. Each relay
should be "daisy chained" to the next one. Avoid star or stub connected configurations if possible to
avoid potential communication problems.
A terminating resistor and capacitor network is required to prevent communication errors. Only the
last MM2 and the master computer driver should have the terminating network to ensure proper
matching. Using terminating resistors and capacitors on all the MM2s would load down the communication network while omitting them at the ends could cause reflections resulting in communication
errors.
Ω
2
Figure 2–6: RS485 TERMINATION
2.2.13 STOP
If this terminal is de-energized, both contactor A and contactor B output relays will open causing the
contactor coils to de-energize. The stop input must be energized before the MM2 will process any
start commands.
GE Power Management
MM2 Motor Manager 2 2-7
2.2 INPUTS AND OUTPUTS 2 INSTALLATION
2.2.14 START A / START B
When the start input terminals are energized, the corresponding contactor output relay will be energized provided all other valid start conditions are met. If any trip occurs, both contactor outputs will
be de-energized. Start A input is used for all types of contactors, that is: Full Voltage Non-reversing,
Reversing, Two Speed (low speed), Wye Delta Open Trans iti on, Inver ter, Slip Ring, Autotransformer,
Part Winding or Wye Delta Closed Transition. Start B input is used for Reversing and Two Speed
2
(high speed) contactor control. Start inputs are usually momentary unless Two Wire control is
selected. Start A and B commands may also be initiated via the seri al link.
2.2.15 LOCAL ISOLATOR N/O
The local isolator NO auxi liar y c ontacts are used to pr event motor star ts i n t he event of t he Local Iso lator being in the “open” position. To prevent starts, the MM2 produces a trip when the Local Isolator
input is open. A Local Isolator Trip is automatically reset when the Local Isolator is re-closed. The
Local Isolator input can be enabled or disabled as required. The factory default is disabled.
2.2.16 CONTACTOR STATUS
The MM2 must know the state of the contactor at all times in order to detect discr epancies in contac tor close/open commands and also to display the state of the contactor. There are two contactor status inputs on the MM2, one for contactor A, the other for contactor B.
Auxiliary contacts mechanically linked to the contactor itself are used to feed back to the contactor
status inputs. No status change following a "start" command indicates an open contactor control circuit and no status change following "stop" command indicates a welded contactor. Appropriate messages and alarms are displayed for these conditions and the status can be read via the serial port.
If the motor contactor is externally energized, the MM2 will seal in the output relay and display an
“EXTERNAL START” message. If the motor contactor is externally de-energized, the MM2 will drop
out the output relay and display an “EXTERNAL STOP” message.
2.2.17 SWITCH COMMON
These two terminals serve as the common for all switches. The MM2 switch inputs operate at 120
VAC which is supplied from these terminals.
2.2.18 DIELECTRIC STRENGTH TESTING
It may be required to test a complete MCC with MM2s installed for dielectric strength. This is also
known as "flash" or "hi-pot" testing. The MM2 is rated for 1500 V AC for 1 minute or 1800 VAC for 1
second isolation between switch inputs, relay outputs, VT voltage input, supply voltage inputs and
ground terminal 13.
When performing dielectric test s, the connect ion to t he sur ge ground t erminal (14) must b e removed .
A filter network is used on the AC input to filter out RF and EMI noise. The filter capacitors and transient absorbers could be damaged by the high voltages relative to surge ground on the AC input.
Under no circumstances should any inputs other than switches, relays, supply voltage, VT input, and CT inputs be dielectric tested.
WARNING
2-8 MM2 Motor Manager 2
GE Power Management
3 HARDWARE 3.1 FACEPLATE FUNCTIONS
3 HARDWARE
3.1 FACEPLATE FUNCTIONS 3.1.1 DESCRIPTION
Once the MM2 has been wired and powered on, it is ready to be programmed for a specific application. Local programming is done using the front panel keypad and the 40 character alphanumeric
display. Remote programming via the serial port is also possible using the MM2PC
®
software.
3.1.2 MESSAGE DISPLAY
A 40 character display is used to communicate all information about the syste m to the user. Trip and
alarm messages will automatically override the currently-displayed message. If no key is pressed for
2 minutes, a user-selected default messaging sequence will be displayed. If the motor is currently
stopped, the Motor Status message will be the default message. Once the motor is started, the first
user-selected message will appear.
RUNNING
STOPPED
TRIPPED
ALARM
FAULT
3
START AAUTO
MANUAL START B
STOP
SETPOINT
MESSAGE
ACTUAL
RESET
VALUE
STORE
Figure 3–1: FRONT PANEL
CONTACTOR A
CONTACTOR B
AUX 1
AUX 2
807230A1.CDR
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MM2 Motor Manager 2 3-1
3.1 FACEPLATE FUNCTIONS 3 HARDWARE
3.1.3 INDICATOR LEDs
• RUNNING: Whenever contactor A and/or B relays are closed and the contactor status inputs
acknowledge the correct state, the RUNNING indicator will be on. Current flow does not affect
the indicator, only contactor status.
• STOPPED: If both contactors A and B are in the OFF state, the STOPPED indicator will be on.
• TRIPPED: If a trip condition causes the A or B contactor relays to de-energize, this indicator will
be on. As long as this indicator is on, the motor cannot be started. It is cleared using the reset
key, lockout reset facility or serial port reset, dependent on the type of trip.
• ALARM: If an alarm condition is present this indicator will be on. Use the A2: ALARM DATA actual
3
values to view current alarm status.
• FAULT: If an internal fault within the MM2 is detected by self-checking, this indicator will be on.
The MM2 must be replaced or repaired.
• CONTACTOR A: If the Contactor A Relay is energized, this indicator will be on.
• CONTACTOR B: If the Contactor B Relay is energized, this indicator will be on.
• AUX 1: If Auxiliary Relay # 1 is on, this indicator will be on.
• AUX 2: If Auxiliary Relay # 2 is on, this indicator will be on.
• AUTO: If the MM2 is in Auto control mode or the Hard-Wired Auto mode, this indicator will be on.
In Auto mode the Start A / Start B switch inputs and START A / START B keypad keys are nonoperational but serial port st art commands are operati onal. In the Hardwir ed Auto Mode, the Auto
Start A and Auto Start B switch inputs are functional in conjunction with the Auto Permissive
switch input. Serial, faceplate and remote starts are disabled. STOP commands from any location are always operational.
• MANUAL: If the MM2 is in Manual control mode, this indicator will be on. In Manual mode the
Start A / Start B switch inputs, AUTO START A / AUTO START B switch inputs and START A /
START B keypad keys are operational but serial port start commands are ignored. All stop commands are operational.
3-2 MM2 Motor Manager 2
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3 HARDWARE 3.2 KEYPAD
3.2 KEYPAD 3.2.1 SETPOINTS KEY
FUNCTION: The SETPOINT key allows the user to examine and alter all trip, alarm, and other MM2
setpoints. There are 6 pages of Setpoints:
• Page 1: Configuration
• Page 2: Protection
• Page 3: Process
• Page 4: Control
• Page 5: Monitoring
• Page 6: Factory Data
EFFECT: Pressing this key will cause the display to show the beginni ng of the next page of setpoints
data. If Actual Values data was on the disp lay bef ore pressing th e SETPOINT k ey, setpoints page S1
will be shown:
]] SETPOINTS
]] S1: CONFIGURATION
USE: This key can be pressed at any time to view MM2 setpoints. To scroll through the setpoint
pages, press the SETPOINT key. To go from section to section within a page, press the MESSAGE
UP and MESSAGE DOWN keys. To go from line to line within a section, press the MESSAGE LEFT
and MESSAGE RIGHT keys.
To alter a setpoint, the VALUE UP and VALUE DOWN keys can be used. All setpoints can be incremented or decremented to pre-determined limits. When the desired value is reached, the STORE
key must be used to save the n ew set point. If an a lt ered set poin t is n ot s tored, the previous val ue will
still be in effect. All control and protection features continue to operate while setpoints data is displayed.
3.2.2 ACTUAL VALUES KEY
FUNCTION: The ACTUAL key allows the user to examine all of the actual motor operating parame-
ters. There are 4 pages of ACTUAL VALUES data:
3
• Page 1: Data
• Page 2: Status
• Page 3: Inputs
• Page 4: Statistics
EFFECT: Pressing this key will cause the display to show the beginning of the next page of Actual
Values data. If setpoints data was on th e displ ay befor e pressin g t he ACTUAL key, page A1 of Actual
Values will be shown:
]] ACTUAL VALUES
]] A1: DATA
GE Power Management
MM2 Motor Manager 2 3-3
3.2 KEYPAD 3 HARDWARE
USE: This key can be pressed at any time to view MM2 actual values. To scroll through the actual
values pages, press the ACTUAL key. To go from section to section within a page, press the MESSAGE UP and MESSAGE DOWN keys. To go from line to line within a section, press the MESSAGE
LEFT and MESSAGE RIGHT keys.
The VALUE UP and VALUE DOWN keys have no effect when actual values data is displayed.
3.2.3 STORE KEY
FUNCTION: The STORE key allows the user to store new setpoints into th e MM2 internal memory.
EFFECT: When this key is pressed the currently displayed Setpoint will be stored in non-volatile
memory and will immediately come into effect. When a Setpoint is stored, the following flash mes-
3
sage will appear on the display:
NEW SETPOINT
STORED
USE: The STORE key can be used only in SETPOINTS mode to store new setpoints, or in ACTUAL
VALUES mode to select a new default message.
3.2.4 STOP KEY
FUNCTION: The STOP key will allow the user to stop the motor from the face plate of the MM2.
EFFECT: Pressing this key will cause the Contactor A and Contactor B output relays to de-energize
therefore dropping out the motor contactor.
USE: The STOP key is used to stop the motor.
3.2.5 RESET KEY
FUNCTION: The RESET key allows the user to reset MM2 trips.
EFFECT: Pressing this key will reset a tri pped stat e on the MM2. A message i ndicati ng that a r eset i s
not possible will be displayed if the condition causing the trip is still present.
USE: The RESET key can be used to reset all trip conditions from the faceplate of the MM2. A
Ground Fault, Stalled Rotor and Overload Trip can be assigned to the LOCKOUT RESET feature on
one of the programmable switch inputs for adde d safety. The factory default allows the resetting of all
trips using the front panel reset key.
3.2.6 START A KEY
FUNCTION: The START A key can be used to start the motor.
EFFECT: Pressing this key will cause the programmed start sequence to begi n.
USE: The START A key is used to sta rt the motor from the faceplate of the MM2. Start A can also be
initiated from the start switch inputs at the back of the MM2 or from the serial port.
3-4 MM2 Motor Manager 2
GE Power Management
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