Introduction; Overview; Description; Features - GE MOTOR MANAGER 2 Instruction Manual

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 plant expansion. One MM2 is required 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 com-
pletely 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 is provided for high-speed communications
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.
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 additional 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 includes all timers, relays and
control inputs (Option 2)
• ground fault trips (50G/51G) (Option 2)
• stalled rotor protection (48) (Option 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 OVERVIEW

1.1.1 DESCRIPTION

1.1.2 FEATURES

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